U.S. patent application number 17/560860 was filed with the patent office on 2022-06-16 for troubleshooting method and apparatus for power supply device.
The applicant listed for this patent is Huawei Digital Power Technologies Co., Ltd.. Invention is credited to Zhengdong JIANG, Bo XIAO.
Application Number | 20220190727 17/560860 |
Document ID | / |
Family ID | |
Filed Date | 2022-06-16 |
United States Patent
Application |
20220190727 |
Kind Code |
A1 |
JIANG; Zhengdong ; et
al. |
June 16, 2022 |
TROUBLESHOOTING METHOD AND APPARATUS FOR POWER SUPPLY DEVICE
Abstract
Embodiments of the present invention disclose a troubleshooting
method and device. The method is applicable to an inverter power
supply system in the power supply device. The inverter power supply
system includes at least two DC/DC modules, and any one of the
DC/DC modules includes fuses F1 and F2, relays K1 and K2, inductors
L1 and L2, switch modules Q1, Q2, and Q3, and direct current bus
capacitors C1 and C2. The troubleshooting method includes: if it is
detected that any one of the DC/DC modules is faulty, determining a
faulty component in the faulty module; and if the faulty component
is a C1 or a C2, and the inverter power supply system is in a
battery discharging mode, turning on a Q2 in the faulty module, so
that an F1 and an F2 of the faulty module are blown, to disconnect
the faulty module from another DC/DC module.
Inventors: |
JIANG; Zhengdong; (Dongguan,
CN) ; XIAO; Bo; (Dongguan, CN) |
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Applicant: |
Name |
City |
State |
Country |
Type |
Huawei Digital Power Technologies Co., Ltd. |
Shenzhen |
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CN |
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Appl. No.: |
17/560860 |
Filed: |
December 23, 2021 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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16790027 |
Feb 13, 2020 |
11239756 |
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17560860 |
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PCT/CN2018/099697 |
Aug 9, 2018 |
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16790027 |
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International
Class: |
H02M 3/158 20060101
H02M003/158; G01R 31/40 20060101 G01R031/40; H02J 7/00 20060101
H02J007/00 |
Foreign Application Data
Date |
Code |
Application Number |
Aug 18, 2017 |
CN |
201710712675.2 |
Claims
1. A troubleshooting method performed by an inverter power supply
system in a power supply device, the inverter power supply system
comprising at least two direct current to direct current (DC/DC)
power supply modules connected in parallel to a battery and
supplying power to a load by using a direct current to alternating
current (DC/AC) power supply, and each of the at least two DC/DC
modules comprising fuses F1 and F2, relays K1 and K2, inductors L1
and L2, switch modules Q1, Q2, and Q3, and DC bus capacitors C1 and
C2; wherein one terminal of the K1 is connected to a positive
terminal of the battery via the F1, one terminal of the K2 is
connected to a negative terminal of the battery via the F2, the
other terminal of the K1 is connected to connection terminals of
the Q1 and the Q2 via the L1, the other terminal of the K2 is
connected to connection terminals of the Q2 and the Q3 via the L2,
one terminal of the Q1 is connected to one terminal of the C1, the
other terminal of the Q1 is connected to one terminal of the Q2,
the other terminal of the Q2 is connected to one terminal of the
Q3, the other terminal of the C1 is connected to the other terminal
of the Q3 by using the C2, the troubleshooting method comprising:
in response to detecting any one of the at least two DC/DC modules
is faulty, determining a faulty component in the faulty module; and
in response to determining that the faulty component is a C1 or a
C2, and the inverter power supply system is in a battery
discharging mode, turning on a Q2 in the faulty module, so that an
F1 and an F2 of the faulty module are blown to disconnect the
faulty module from another DC/DC module.
2. The troubleshooting method according to claim 1, further
comprising: if a short circuit component is the C1 or the C2, and
the inverter power supply system is in a battery charging mode,
turning off a Q1 and a Q3 of the faulty module, and turning on the
Q2 of the faulty module after a preset time interval, so that the
F1 and the F2 of the faulty module are blown to disconnect the
faulty module from the another DC/DC module.
3. The troubleshooting method according to claim 1, wherein the
determining a faulty component in the faulty module comprises: when
the Q2 and the Q1 of the faulty module are in an off state, turning
on a Q3 of the faulty module and detecting a current state of an L1
and an L2 of the faulty module, and if it is detected that there is
a current both in the L1 and the L2 of the faulty module,
determining that the Q1 of the faulty module is short-circuited; or
when the Q2 and the Q3 of the faulty module are in an off state,
turning on a Q1 of the faulty module and detecting a current state
of an L1 and an L2 of the faulty module, and if it is detected that
there is a current both in the L1 and the L2 of the faulty module,
determining that the Q3 of the faulty module is
short-circuited.
4. The troubleshooting method according to claim 3, further
comprising: if a short circuit component in the faulty module is
the Q1 or the Q3, turning on the Q2 of the faulty module, so that
the F1 and the F2 of the faulty module are blown to disconnect the
faulty module from the another DC/DC module.
5. The troubleshooting method according to claim 3, further
comprising: if a short circuit component in the faulty module is
the Q1 or the Q3, turning off any one or more of a K1, a K2, the
Q1, the Q2, or the Q3 of the faulty module, to disconnect a
parallel connection between the faulty module and the another DC/DC
module.
6. A power supply device, comprising: an inverter power supply
system comprising at least two DC/DC modules connected in parallel
to a battery and supplying power to a load by using a direct
current to alternating current (DC/AC) power supply, and each of
the at least two DC/DC modules comprising fuses F1 and F2, relays
K1 and K2, inductors L1 and L2, switch modules Q1, Q2, and Q3, and
DC bus capacitors C1 and C2; wherein one terminal of the K1 is
connected to a positive terminal of a battery via the F1, one
terminal of the K2 is connected to a negative terminal of the
battery via the F2, the other terminal of the K1 is connected to
connection terminals of the Q1 and the Q2 via the L1, the other
terminal of the K2 is connected to connection terminals of the Q2
and the Q3 via the L2, one terminal of the Q1 is connected to one
terminal of the C1, the other terminal of the Q1 is connected to
one terminal of the Q2, the other terminal of the Q2 is connected
to one terminal of the Q3, the other terminal of the C1 is
connected to the other terminal of the Q3 by using the C2, and
wherein each of the at least two DC/DC modules of the power supply
device comprises: a detection unit configured to detect a voltage
signal and/or a current signal in any one of the DC/DC modules,
determine, based on the detected voltage signal and/or the detected
current signal, whether the any one of the DC/DC modules is faulty,
and when detecting that the any one of the DC/DC modules is faulty,
detect a faulty component in the faulty module; and a control unit
configured to, when the detection unit detects that the faulty
component in the faulty module is a C1 or a C2, and the inverter
power supply system is in a battery discharging mode, turn on a Q2
of the faulty module, wherein an F1 and an F2 of the faulty module
are blown to disconnect the faulty module from another DC/DC
module.
7. The power supply device according to claim 6, wherein the
control unit is further configured to: when the detection unit
detects that the faulty component in the faulty module is the C1 or
the C2, and the inverter power supply system is in a battery
charging mode, turn off a Q1 and a Q3 of the faulty module, and
turn on the Q2 of the faulty module after a preset time interval,
so that the F1 and the F2 of the faulty module are blown to
disconnect the faulty module from the another DC/DC module.
8. The power supply device according to claim 6, wherein the
detection unit is further configured to: when the Q2 and the Q1 of
the faulty module are in an off state, turn on a Q3 of the faulty
module and detect a current state of an L1 and an L2 of the faulty
module, and if it is detected that there is a current both in the
L1 and the L2 of the faulty module, determine that the Q1 of the
faulty module is short-circuited; or when the Q2 and the Q3 of the
faulty module are in an off state, turn on a Q1 of the faulty
module and detect a current state of an L1 and an L2 of the faulty
module, and if it is detected that there is a current both in the
L1 and the L2 of the faulty module, determine that the Q3 of the
faulty module is short-circuited.
9. The power supply device according to claim 8, wherein the
control unit is further configured to: when the detection unit
detects that the short circuit component in the faulty module is
the Q1 or the Q3, turn on the Q2 of the faulty module, so that the
F1 and the F2 of the faulty module are blown to disconnect the
faulty module from the another DC/DC module.
10. The power supply device according to claim 8, wherein the
control unit is further configured to: when the detection unit
detects that the short circuit component in the faulty module is
the Q1 or the Q3, turn off any one or more of a K1, a K2, the Q1,
the Q2, or the Q3 of the faulty module, to disconnect a parallel
connection between the faulty module and the another DC/DC module.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a continuation of U.S. patent
application Ser. No. 16/790,027, filed on Feb. 13, 2020, which is a
continuation of International Application No. PCT/CN2018/099697,
filed on Aug. 9, 2018, which claims priority to Chinese Patent
Application No. 201710712675.2, filed on Aug. 18, 2017. All of the
afore-mentioned patent applications are hereby incorporated by
reference in their entireties.
TECHNICAL FIELD
[0002] The present invention relates to the field of electronic
technologies, and in particular, to a troubleshooting method and
apparatus for a power supply device.
BACKGROUND
[0003] An inverter power supply system is widely applied to various
devices having high requirements for power supply reliability, and
is configured to supply power to loads having high requirements for
power supply stability. For example, in the communications field,
an inverter power supply system such as an inverter or an
uninterruptible power supply system (Uninterruptible power supply
system, UPS) is usually used to supply power to key loads having
high requirements for power supply stability.
[0004] In the prior art, as a capacity of an inverter power supply
system is increasing, more power supply modules in the inverter
power supply system are connected in parallel. A plurality of
direct current/direct current conversion functional circuits (or
referred to as a direct current/direct current power supply, DC/DC)
are often connected in parallel. In a scenario in which the
plurality of power supply modules are connected in parallel in the
inverter power supply system, if one of the plurality of power
supply modules is faulty when the inverter power supply system is
running, there is a fault circuit in the plurality of power supply
modules, and therefore other normal modules cannot work normally. A
power output of the inverter power supply system is interrupted,
and this affects normal operating of the key loads. Therefore,
power supply stability of a device is low, and power supply
reliability is poor.
SUMMARY
[0005] Embodiments of the present invention provide a
troubleshooting method and apparatus for a power supply device, to
improve stability and power supply reliability of a DC/DC circuit,
and to improve applicability of an inverter power supply
system.
[0006] A first aspect provides a troubleshooting method for a power
supply device, where the troubleshooting method is applicable to an
inverter power supply system in the power supply device. The
inverter power supply system includes at least two direct current
to direct current DC/DC power supply modules, the at least two
DC/DC modules are connected in parallel to a same battery and
supply power to a load by using a direct current to alternating
current DC/AC power supply. Any one of the at least two DC/DC
modules includes fuses F1 and F2, relays K1 and K2, inductors L1
and L2, switch modules Q1, Q2, and Q3, and direct current bus
capacitors C1 and C2. One terminal of the K1 is connected to a
positive terminal of the battery by using the F1, one terminal of
the K2 is connected to a negative terminal of the battery by using
the F2, the other terminal of the K1 is connected to connection
terminals of the Q1 and the Q2 by using the L1, the other terminal
of the K2 is connected to connection terminals of the Q2 and the Q3
by using the L2, one terminal of the Q1 is connected to one
terminal of the C1, the other terminal of the Q1 is connected to
one terminal of the Q2, the other terminal of the Q2 is connected
to one terminal of the Q3, the other terminal of the C1 is
connected to the other terminal of the Q3 by using the C2. The
troubleshooting method includes:
[0007] This troubleshooting method can detect a voltage signal
and/or a battery signal of any one of the DC/DC modules, and
determine whether a faulty module exists based on the detected
voltage signal and/or battery signal. The voltage signal of the
DC/DC module may include a battery voltage signal, a direct current
bus voltage signal, and/or the like. The current signal of the
DC/DC module may include a current signal of the inductor L1 and/or
the L2, and/or the like.
[0008] One terminal of the K1 is connected to a positive terminal
of the battery by using the F1, one terminal of the K2 is connected
to a negative terminal of the battery by using the F2, one terminal
of the K1 is connected to one terminal of the Q1 and one terminal
of the Q2 by using the L1, one terminal of the K2 is connected to
one terminal of the Q2 and one terminal of the Q3 by using the L2,
one terminal of the Q1 is connected to one terminal of the C1, one
terminal of the Q1 is connected to one terminal of the Q2, one
terminal of the Q2 is connected to one terminal of the Q3, the
other terminal of the C1 is connected to one terminal of the Q3 by
using the C2. The troubleshooting method includes:
[0009] if it is detected that any one of the at least two DC/DC
modules is faulty, determining a faulty component in the faulty
module, where the faulty module is any one of the at least two
DC/DC modules that is faulty; and
[0010] if the faulty component is a C1 or a C2, and the inverter
power supply system is in a battery discharging mode, turning on a
Q2 in the faulty module, so that an F1 and an F2 of the faulty
module are blown, to disconnect the faulty module from another
DC/DC module.
[0011] In this embodiment of the present invention, when it is
detected that any one of the DC/DC modules is faulty, the faulty
module may be isolated from the another DC/DC module, to ensure
normal working of the another module that is different from the
faulty module and that is connected in parallel, ensure a normal
power supply state of the inverter power supply system, and improve
power supply reliability of the inverter power supply system.
[0012] Optionally, the troubleshooting method further includes: if
a short circuit component is the C1 or the C2, and the inverter
power supply system is in a battery charging mode, turning off a Q1
and a Q3 of the faulty module, and turning on the Q2 of the faulty
module after a preset time interval, so that the F1 and the F2 of
the faulty module are blown, to disconnect the faulty module from
the another DC/DC module. In this embodiment of the present
invention, regardless of whether the inverter power supply system
is in the battery discharging mode, the battery charging mode, or
another working state, when it is detected that any one of the
DC/DC modules is faulty, the faulty module may be isolated from the
another DC/DC module, to ensure normal working of the another
module that is different from the faulty module and that is
connected in parallel, further ensure power supply stability of the
inverter power supply system, improve power supply reliability of
the inverter power supply system, and enhance applicability.
[0013] Optionally, after detecting the faulty module and when the
Q2 and the Q1 of the faulty module are in an off state, the
inverter power supply system may further turn on the Q3 of the
faulty module and detect current states of an L1 and an L2 of the
faulty module. The detecting current states of an L1 and an L2 may
include detecting whether there is a current in the L1 or the L2.
If it is detected that there is a current both in the L1 and the L2
of the faulty module, the inverter power supply system determines
that the Q1 of the faulty module is short-circuited. When the Q3 is
working, the inverter power supply system detects that there is a
current both in the L1 and the L2 of the faulty module, and there
is a current only in an L2 of a normal module (for example, the
another DC/DC module) (in this case, a Q3 of the another DC/DC
module is in an on state, and a Q1 and a Q2 are both in an off
state, and therefore there is no current in an L1 of the another
DC/DC module). Therefore, if detecting that there is a current both
in an L1 and an L2 of a DC/DC power converter 1, the inverter power
supply system may determine that the Q1 of the faulty module is
short-circuited. It is convenient to detect the faulty component in
the faulty module, and therefore detection efficiency is
higher.
[0014] Optionally, after detecting the faulty module and when the
Q2 and the Q3 of the faulty module are in an off state, the
inverter power supply system may further turn on the Q1 of the
faulty module and detect the current states of the L1 and the L2 of
the faulty module. If detecting that there is a current both in the
L1 and the L2 of the faulty module, the inverter power supply
system may determine that the Q3 of the faulty module is
short-circuited. When a Q1 is working, if a DC/DC module is faulty
(for example, a Q3 of the DC/DC module is short-circuited), there
is a current both in an L1 and an L2 of the DC/DC module. In this
case, there is a current only in an L1 of a normal module (namely,
another DC/DC module) (in this case, a Q1 of another DC/DC module 2
is in an on state, a Q2 and a Q3 are both in an off state, and
therefore there is no current in an L2 of the another DC/DC
module). Therefore, if the inverter power supply system detects
that there is a current both in the L1 and the L2 of the faulty
module, the Q3 of the faulty module is faulty. This provides
diversified manners of detecting the faulty component in the faulty
module, enhances convenience of detecting the faulty component in
the faulty module, and improves efficiency of detecting the faulty
component.
[0015] Optionally, the troubleshooting method further includes:
when a short circuit component in the faulty module is the Q1 or
the Q3, turning on the Q2 of the faulty module, so that the F1 and
the F2 of the faulty module are blown, to disconnect the faulty
module from the another DC/DC module. Isolation of the faulty
module ensures normal working of the another module in the inverter
power supply system, ensures normal power supply of the inverter
power supply system, improves power supply reliability of the
inverter power supply system, and enhances applicability.
[0016] Optionally, the troubleshooting method further includes:
when a short circuit component in the faulty module is the Q1 or
the Q3, turning off any one or more of a K1, a K2, the Q1, the Q2,
or the Q3 of the faulty module, to disconnect a connection between
the faulty module and a battery, and disconnect a parallel
connection between the faulty module and the another DC/DC module.
This leads to a simpler operation, adds a manner of isolating the
faulty module, and enhances flexibility of the operation.
[0017] A second aspect provides a power supply device, where the
power supply device includes an inverter power supply system. The
inverter power supply system includes at least two DC/DC modules,
the at least two DC/DC modules are connected in parallel to a same
battery and supply power to a load by using a direct current to
alternating current DC/AC power supply. Any one of the at least two
DC/DC modules includes fuses F1 and F2, relays K1 and K2, inductors
L1 and L2, switch modules Q1, Q2, and Q3, and direct current bus
capacitors C1 and C2. One terminal of the K1 is connected to a
positive terminal of the battery by using the F1, one terminal of
the K2 is connected to a negative terminal of the battery by using
the F2, one terminal of the K1 is connected to one terminal of the
Q1 and one terminal of the Q2 by using the L1, one terminal of the
K2 is connected to one terminal of the Q2 and one terminal of the
Q3 by using the L2, one terminal of the Q1 is connected to one
terminal of the C1, one terminal of the Q1 is connected to one
terminal of the Q2, one terminal of the Q2 is connected to one
terminal of the Q3, and the other terminal of the C1 is connected
to one terminal of the Q3 by using the C2.
[0018] The any one of the at least two DC/DC modules includes: a
detecting unit and a control unit. The detection unit is configured
to detect a voltage signal and/or a current signal in the any one
of the DC/DC modules, and determine, based on the detected voltage
signal and/or the detected current signal, whether the any one of
the DC/DC modules is faulty. The detection unit is further
configured to, when detecting that the any one of the DC/DC modules
is faulty, detect a faulty component in the faulty module. The
control unit is configured to, when the detection unit detects that
the faulty component in the faulty module is a C1 or a C2, and the
inverter power supply system is in a battery discharging mode, turn
on a Q2 of the faulty module, where an F1 and an F2 of the faulty
module are blown, to disconnect the faulty module from another
DC/DC module.
[0019] Optionally, the control unit is further configured to: when
the detection unit detects that the faulty component in the faulty
module is the C1 or the C2, and the inverter power supply system is
in a battery charging mode, turn off a Q1 and a Q3 of the faulty
module, and turn on the Q2 of the faulty module after a preset time
interval, so that the F1 and the F2 of the faulty module are blown,
to disconnect the faulty module from the another DC/DC module.
[0020] Optionally, the detection unit is further configured to:
when the Q2 and the Q1 of the faulty module are in an off state,
turn on the Q3 of the faulty module and detect a current state of
the L1 and the L2 of the faulty module, and if it is detected that
there is a current both in the L1 and the L2 of the faulty module,
determine that the Q1 of the faulty module is short-circuited; or
when the Q2 and the Q3 of the faulty module are in an off state,
turn on the Q1 of the faulty module and detect a current state of
the L1 and the L2 of the faulty module, and if it is detected that
there is a current both in the L1 and the L2 of the faulty module,
determine that the Q3 of the faulty module is short-circuited.
[0021] Optionally, the control unit is further configured to: when
the detection unit detects that the short circuit component in the
faulty module is the Q1 or the Q3, turn on the Q2 of the faulty
module, so that the F1 and the F2 of the faulty module are blown,
to disconnect the faulty module from the another DC/DC module.
[0022] Optionally, the control unit is further configured to: when
the detection unit detects that the short circuit component in the
faulty module is the Q1 or the Q3, turn off any one or more of a
K1, a K2, the Q1, the Q2, or the Q3 of the faulty module, to
disconnect a parallel connection between the faulty module and the
another DC/DC module.
[0023] In this embodiment of the present invention, the inverter
power supply system may detect a fault in each DC/DC module by
using the detection unit or another logical control module built in
each DC/DC module. After detecting the faulty module, the inverter
power supply system controls the on or off state of the switch
module, for example, the Q1, the Q2, or the Q3, by using the
control unit (or referred to as a drive unit), to isolate the
faulty module. This ensures normal working of the another DC/DC
module in the inverter power supply system, ensures normal power
supply of the inverter power supply system, improves power supply
reliability of the inverter power supply system, and enhances
applicability.
BRIEF DESCRIPTION OF DRAWINGS
[0024] To describe technical solutions in embodiments of the
present invention more clearly, the following illustrates
accompanying drawings required for illustration in the embodiments
of the present invention.
[0025] FIG. 1 is a schematic diagram of a structure of an inverter
power supply system;
[0026] FIG. 2 is a schematic connection diagram of a power
converter according to an embodiment of the present invention;
[0027] FIG. 3 is a schematic diagram of a fault circuit according
to an embodiment of the present invention;
[0028] FIG. 4 is a schematic diagram of another fault circuit
according to an embodiment of the present invention; and
[0029] FIG. 5 is a schematic flowchart of a troubleshooting method
for a power supply device according to an embodiment of the present
invention.
DESCRIPTION OF EMBODIMENTS
[0030] The following describes the embodiments of the present
invention with reference to the accompanying drawings in the
embodiments of the present invention.
[0031] FIG. 1 is a schematic diagram of a structure of an inverter
power supply system. As shown in FIG. 1, in a block diagram of a
typical inverter power supply system, the inverter power supply
system mainly includes three parts, including a DC/DC module (also
referred to as a DC/DC power converter), an alternating current to
direct current AC/DC power supply module (also referred to as an
AC/DC power converter), a direct current to alternating current
DC/AC power supply module (also referred to as a DC/AC power
converter), and the like. The inverter power supply system
generally has three power ports: a direct current (for example, a
battery) input port, an alternating current (for example, mains)
input port, and an alternating current output port. The three power
ports respectively correspond to the three power converters. The
direct current input port corresponds to the DC/DC power converter,
the alternating current input port corresponds to the AC/DC power
converter, and the alternating current output port corresponds to
the DC/AC power converter. The DC/DC power converter boosts a
battery low voltage input by the direct current input port to a
direct current high voltage, and outputs it to an input port of the
DC/AC power converter. The input port of the DC/AC power converter
is two terminals of a capacitor C, and voltages at the two
terminals of the capacitor C are also referred to as direct current
bus voltages. The AC/DC power converter converts an alternating
current input by the alternating current input port into a direct
current, corrects an input power factor, and outputs the direct
current to the two terminals of the capacitor C. The capacitor C
stores energy and obtains the direct current bus voltages. The
DC/AC power converter converts a direct current high voltage of a
direct current bus into an alternating current, and outputs the
alternating current to a load by using the alternating current
output port, to supply power to the load. A filter capacitor C with
a relatively large capacity is connected to the direct current bus.
When the mains power supply is normal, an alternating current mains
input is usually converted by the AC/DC power converter and the
DC/AC power converter into an alternating current that complies
with a specification to supply power to a key load. When the mains
power supply fails, a direct current voltage output by the battery
is boosted to a direct current high voltage by the DC/DC power
converter, the direct current high voltage is output to the direct
current bus and is converted by a DC/AC power inverter into an
alternating current that complies with the specification to supply
power to the key load. This meets an uninterruptible power supply
requirement of the key load.
[0032] The direct current bus described in this embodiment of the
present invention may be a bus in the inverter power supply system.
This is not limited herein.
[0033] The DC/DC power converter can implement bidirectional energy
flow and support two working modes: a battery discharging mode and
a battery charging mode. In the battery discharging mode, the
battery outputs a direct current voltage, and the DC/DC power
converter outputs a direct current high voltage to the direct
current bus, so that a voltage of the direct current bus is
maintained at a high level. In the battery discharging mode, the
capacitor C on the direct current bus is in an energy storage
state. In a working mode in which the mains power supply is normal,
the mains power supply outputs a direct current high voltage to the
direct current bus by using the AC/DC power converter, and the
capacitor C on the direct current bus stores energy. In the battery
charging mode, the capacitor C charges, by using the DC/DC power
converter, the battery for energy storage.
[0034] To meet a voltage inversion requirement of the AC/DC power
converter, a valid inversion output value of the AC/DC power
converter is a 230 V sine alternating current, and at least a
direct current bus voltage 230 V.times.1.414=325.22 V is required.
Therefore, a pulse width modulation (pulse width modulation, PWM)
power converter, such as a forward converter, a push-pull
converter, or a full bridge converter, is usually used to meet a
requirement of an input and output voltage variation range. In
other words, the forward converter, the push-pull converter, or the
full bridge converter may be configured as the DC/DC power
converter, the AC/DC power converter, and the DC/AC power converter
shown in FIG. 1. As shown in FIG. 1, the DC/DC power converter is
connected to an output terminal of the AC/DC power converter of the
alternating current mains power supply, and generates the direct
current high voltage through filtering by the capacitor C on the
direct current bus. In this way, the battery and the mains power
supply function as a mutual backup for each other, to meet the
uninterruptible power supply requirement.
[0035] However, as a capacity of the inverter power supply system
increases, more power converters are used in parallel in the
inverter power supply system, and a plurality of DC/DC power
converters are used in parallel. FIG. 2 is a schematic connection
diagram of a power converter according to an embodiment of the
present invention. As shown in FIG. 2, two DC/DC power converters
are connected in parallel to a same battery string, and each DC/DC
power converter is connected in parallel to one DC/AC power
converter, to supply power to a load by using the DC/AC power
converter. FIG. 2 shows only two DC/DC power converters. In a
specific implementation, a quantity of DC/DC power converters may
be determined based on a requirement in an actual application
scenario. This is not limited herein. The DC/DC power converter
shown in FIG. 2 may be further connected in parallel to an AC/DC
power converter. The DC/DC power converter shown in FIG. 1 may be a
plurality of DC/DC power converters connected in parallel. This is
not limited herein.
[0036] FIG. 2 is a schematic diagram of a connection between some
components of the two DC/DC power converters connected in parallel.
The DC/DC power converter may further include more components. A
connection manner of the components may be set based on a function
of the DC/DC power converter required in an actual application
scenario. This is not limited herein. In this embodiment of the
present invention, a structure of the power converter shown in FIG.
2 is used as an example for description.
[0037] As shown in FIG. 2, any one of the two DC/DC power
converters (the following implementation uses a DC/DC power
converter 1 as an example) may include fuses F1 and F2, relays K1
and K2, inductors L1 and L2, switch modules Q1, Q2, and Q3, and
direct current bus capacitors C1 and C2. One terminal of the K1 is
connected to a positive terminal (BAT+) of a battery by using the
F1, one terminal of the K2 is connected to a negative terminal
(BAT-) of the battery by using the F2, one terminal of the K1 is
connected to the positive terminal of the battery by using the F1,
one terminal of the K2 is connected to the negative terminal of the
battery by using the F2, the other terminal of the K1 is connected
to connection terminals of the Q1 and the Q2 by using the L1, the
other terminal of the K2 is connected to connection terminals of
the Q2 and the Q3 by using the L2, one terminal of the Q1 is
connected to one terminal of the C1, the other terminal of the Q1
is connected to one terminal of the Q2, the other terminal of the
Q2 is connected to one terminal of the Q3, and the other terminal
of the C1 is connected to the other terminal of the Q3 by using the
C2. A troubleshooting method includes:
[0038] The Q1, Q2, or Q3 may be a switch transistor, for example,
an MOS transistor. This is not limited herein.
[0039] In a battery discharging mode, the Q2 of the DC/DC power
converter is turned on, and a current from the BAT+ terminal of the
battery flows through the F1 and the K1 and arrives at the L1, and
flows through the Q2, the L2, the K, and the F2 and arrives at the
BAT- terminal, to store energy for the L1 and the L2. When the Q2
is turned off and the Q1 and the Q3 are turned on, the energy
stored by the L1 and the L2 may pass through the Q1 and the Q3 to
charge the C1 and the C2. In a battery charging mode, when the Q1
and the Q3 of the DC/DC power converter are turned on, a current
from a direct current bus flows from the positive terminal of the
C1, and flows through the Q1, to store energy for the L1 and the
L2. When the Q1 and the Q3 are turned off and the Q2 is turned on,
the energy stored by the L1 and the L2 may flow through the F1 and
arrive at the BAT+ terminal of the battery, to charge the battery.
In a normal working process of the DC/DC power converter, both the
DC/DC power converter 1 and the DC/DC power converter 2 have their
respective working circuits that are independent of each other and
do not affect each other.
[0040] In a working process of the DC/DC power converter, if a
component of the DC/DC power converter 1 is faulty, for example, is
short-circuited, a normal working state of a DC/DC power converter
2 is affected. As a result, power supply of an inverter power
supply system is interrupted, and normal working of a key load is
affected. For example, if a C1 of the DC/DC power converter 1 is
short-circuited, a fault circuit is formed between the DC/DC power
converter 1 and the DC/DC power converter 2. As a result, an
undamaged module or device, for example, the DC/DC power converter
2, cannot work normally, and output of the inverter power supply
system is interrupted. The DC/DC power converter 1 and the DC/DC
power converter 2 share the battery string, and are used in
parallel. When the C1 of the DC/DC power converter 1 is
short-circuited, there may be a short circuit current of a short
circuit path shown by a dashed line with an arrow in FIG. 3 between
the DC/DC power converter 1 and the DC/DC power converter 2. FIG. 3
is a schematic diagram of a fault circuit according to an
embodiment of the present invention. The short circuit current on
the path shown in FIG. 3 causes a direct current bus overvoltage
(namely, a voltage between a positive terminal of a C1 and a
negative terminal of a C2 of the DC/DC power converter 2) of the
DC/DC power converter 2, and further causes the DC/DC power
converter 2 to exit a normal working mode.
[0041] In a specific implementation, each DC/DC power converter in
the inverter power supply system may include a detection unit (also
referred to as a fault detection unit), a control unit, and the
like. For ease of description, the following uses a detection unit
and a control unit in the DC/DC power converter 1 as an example for
description. The detection unit is mainly configured to detect a
voltage signal and/or a current signal. Optionally, the detection
unit may be configured to detect a battery voltage, a direct
current bus voltage, and the like, and may also be configured to
sample a current of the inductor. Specifically, the detection unit
detects the voltage between the positive terminal of the C1 and the
negative terminal of the C2 of the DC/DC power converter 2. If the
detection unit detects the direct current bus voltage (namely, the
voltage between the positive terminal of the C1 and the negative
terminal of the C2 of the DC/DC power converter 2) of the DC/DC
power converter 2, the detection unit may determine that the C1 or
a C2 of the DC/DC power converter 1 is short-circuited because the
battery voltage is divided by using the bus capacitor on each power
converter. The detection unit may transmit the detected voltage
signal and/or the detected battery signal to a processing unit by
using a sensor and/or a current sampling circuit. The control unit
processes the voltage signal and/or the current signal detected by
the detection unit, sends a control signal, and controls on and off
of the relay and the switch transistor by using a drive
circuit.
[0042] Optionally, the control unit may also be referred to as a
processing unit, and may be specifically a processor of the
inverter power supply system, for example, a central processing
unit (central processing unit, CPU), configured to process a
voltage signal and/or a current signal of each DC/DC power
converter, and another functional module in the inverter power
supply system.
[0043] Optionally, the detection unit in the DC/DC power converter
1 may detect a working status of each component in the DC/DC power
converter 1. When detecting that the DC/DC power converter 1 is
faulty, the detection unit in the DC/DC power converter 1 may
further detect a faulty component in the DC/DC power converter 1.
In a specific implementation, the DC/DC power converter 1 may
further perform drive control, namely, turn on or off the Q1, the
Q2, or the Q3 by using the built-in control unit (or referred to as
the processing unit or a drive unit) of the DC/DC power converter
1. For details, refer to a drive control manner of an inverter
power supply system in the prior art, and this is not limited
herein.
[0044] In a specific implementation, when the C1 of the DC/DC power
converter 1 is faulty, a working mode of the DC/DC power converter
1 may be the battery discharging mode or the battery charging mode.
Specifically, the detection unit detects the voltage between the
positive terminal of the C1 and the negative terminal of the C2 of
the DC/DC power converter 2. If the detection unit detects the
direct current bus voltage (namely, the voltage between the
positive terminal of the C1 and the negative terminal of the C2 of
the DC/DC power converter 2) of the DC/DC power converter 2, the
detection unit may determine that the C1 or the C2 of the DC/DC
power converter 1 is short-circuited because the battery voltage is
divided by using the bus capacitor on each power converter. When
the C1 of the DC/DC power converter 1 is faulty, the working mode
of the DC/DC power converter 1 is the battery charging mode and the
Q1 and the Q3 of the DC/DC power converter 1 are in an on state. To
avoid the fault circuit shown by the dashed line with an arrow in
FIG. 3 between the DC/DC power converter 1 and the DC/DC power
converter 2 after the C1 of the DC/DC power converter 1 is faulty,
when the inverter power supply system detects that the C1 of the
DC/DC power converter 1 is short-circuited, the inverter power
supply system immediately turns off the Q1 and the Q3 of the DC/DC
power converter 1 to stop the battery charging mode of the DC/DC
power converter 1, so that the faulty C1 of the DC/DC power
converter 1 does not affect the normal working mode of the DC/DC
power converter 2. Further, the inverter power supply system may
turn on the Q2 of the DC/DC power converter 1 after a preset time
interval since the inverter power supply system turns off the Q1
and the Q3 of the DC/DC power converter 1, so that the DC/DC power
converter 1 enters an abnormal working mode. After the Q2 of the
DC/DC power converter 1 is turned on, the current output by the
BAT+ terminal of the battery flows through the F1, the K1, the L1,
and the Q2 of the DC/DC power converter 1, then through the L2, the
K2, and the F2, and returns to the BAT- terminal of the battery. In
this abnormal working mode, the current of the F1 and the F2 of the
DC/DC power converter 1 is excessively high, and consequently the
F1 and the F2 are blown. Therefore, the DC/DC power converter 1 is
isolated from the DC/DC power converter 2 and another module
connected in parallel, to ensure normal working of the DC/DC power
converter and the another module connected in parallel, and ensure
a normal power supply state of the inverter power supply system. In
a specific implementation, the preset time interval between a time
point at which the Q1 and the Q3 of the DC/DC power converter 1 are
turned off and a time point at which the Q2 is turned on may be set
based on a requirement of an actual application scenario, and may
be greater than or equal to a shortest time interval (for example,
2 .mu.s) for ensuring that the Q1, the Q2, and the Q3 are not
simultaneously turned on. To avoid an excessively long fault
detection time of the inverter power supply system, set a short
preset time interval. This may be specifically determined based on
the actual application scenario. This is not limited herein.
[0045] Optionally, when the C1 of the DC/DC power converter 1 is
faulty, the working mode of the DC/DC power converter 1 is the
battery discharging mode. In this case, the current of the DC/DC
power converter 1 flows from the BAT+ terminal of the battery to
another component. To avoid the fault circuit shown by the dashed
line with an arrow in FIG. 3 between the DC/DC power converter 1
and the DC/DC power converter 2 after the C1 of the DC/DC power
converter 1 is faulty, when the inverter power supply system
detects that the C1 of the DC/DC power converter 1 is
short-circuited, the inverter power supply system may directly turn
on the Q2 of the DC/DC power converter 1, so that the faulty C1 of
the DC/DC power converter 1 does not affect the normal working mode
of the DC/DC power converter 2. After the Q2 of the DC/DC power
converter 1 is turned on, the current output by the BAT+ terminal
of the battery flows through the F1, the K1, the L1, and the Q2 of
the DC/DC power converter 1, then through the L2, the K2, and the
F2, and returns to the BAT- terminal of the battery. In this
abnormal working mode, the current of the F1 and the F2 of the
DC/DC power converter 1 is excessively high, and consequently the
F1 and the F2 are blown. Therefore, the DC/DC power converter 1 is
isolated from the DC/DC power converter 2 and another module
connected in parallel, to ensure normal working of the DC/DC power
converter and the another module connected in parallel, ensure the
normal power supply state of the inverter power supply system, and
improve power supply stability and applicability of the inverter
power supply system.
[0046] Optionally, when a plurality of power supply modules such as
the DC/DC power converter 1 and the DC/DC power converter 2 are
connected in parallel and the power supply modules are in the
battery charging mode, after a Q1 of a power supply module (for
example, the DC/DC power converter 1) is short-circuited, a fault
circuit current on a faulty path 1 shown in FIG. 4 is formed in the
DC/DC power converter 1. FIG. 4 is a schematic diagram of another
fault circuit according to an embodiment of the present invention.
A fault circuit current on a faulty path 2 shown in FIG. 4 is
formed between the DC/DC power converter 1 and the DC/DC power
converter 2. As a result, sampling of a charging current by the
DC/DC power converter 2 (namely, a normal module) is inaccurate,
and the normal module cannot be normally charged.
[0047] In a specific implementation, after the Q1 of the DC/DC
power converter 1 is short-circuited and fails, resistance of the
BAT+ and the BAT- terminals of the battery to a remote common
ground terminal N of the C1 and the C2 of the DC/DC power converter
1 changes, and consequently voltages of the positive and negative
terminals of the battery in the power supply modules (including the
DC/DC power converter 2) to the N are asymmetric. A bias voltage
state is formed. When the power supply modules are in the bias
voltage state, the fault detection unit in the inverter power
supply system is triggered to detect working statuses of the power
supply modules. When the fault detection unit detects the working
statuses of the power supply modules (for example, the DC/DC power
converter 1 and the DC/DC power converter 2, the following uses the
DC/DC power converter 1 as an example), the Q3 of the DC/DC power
converter 1 may be first turned on, for example, the inverter power
supply system turns on the Q3 of the DC/DC power converter 1 for 3
.mu.s (a duration may be defined based on a requirement of the
actual application scenario). When the Q3 is working, if the DC/DC
power converter 1 is faulty (for example, the Q1 is
short-circuited), there is a current both in the L1 and the L2 of
the DC/DC power converter 1, and there is a current only in an L2
of the normal module (for example, the DC/DC power converter 2) (in
this case, a Q3 of the DC/DC power converter 2 is in an on state,
and a Q1 and a Q2 are both in an off state, and therefore there is
no current in an L1 of the DC/DC power converter 2). Therefore, if
detecting that there is a current both in the L1 and the L2 of the
DC/DC power converter 1, the inverter power supply system may
determine that the Q1 of the DC/DC power converter 1 is
short-circuited.
[0048] Optionally, the inverter power supply system may
alternatively detect whether the Q3 of the DC/DC power converter (a
DC/DC power conversion module 1, a DC/DC power conversion module 2,
or the like, and the DC/DC power conversion module 1 is used as an
example) is faulty. Specifically, the current in the L1 and the L2
is detected after the Q1 of the DC/DC power converter 1 is turned
on. When the Q1 is working, if the DC/DC power converter 1 is
faulty (for example, the Q3 of the DC/DC power converter 1 is
short-circuited), there is a current both in the L1 and the L2 of
the DC/DC power converter 1. In this case, there is a current only
in an L1 of the normal module (namely, the DC/DC power converter 2)
(in this case, the Q1 of the DC/DC power converter 2 is in an on
state, the Q2 and the Q3 are both in an off state, and therefore
there is no current in the L2 of the DC/DC power converter 2).
Therefore, if detecting that there is a current both in the L1 and
the L2 of the DC/DC power converter 1, the inverter power supply
system may determine that the Q3 of the DC/DC power converter 1 is
faulty.
[0049] In a specific implementation, if detecting that the short
circuit component of the DC/DC power converter 1 is the Q1 or the
Q3, the inverter power supply system may turn on the Q2 of the
DC/DC power converter 1, so that the F1 and the F2 of the DC/DC
power converter 1 are blown, to disconnect the DC/DC power
converter 1 from another DC/DC power conversion module.
[0050] Optionally, if detecting that the short circuit component of
the DC/DC power converter 1 is the Q1 or the Q3, the inverter power
supply system may alternatively turn off the relay. When there is
no current in the relay, the inverter power supply system may stop
DC/DC and DC/AC circuits of the DC/DC power converter 1, to isolate
a fault.
[0051] In this embodiment of the present invention, the inverter
power supply system may detect a fault in each DC/DC power
converter by using a logical control module, such as the detection
unit (or referred to as the fault detection unit) built in each
DC/DC power converter. After detecting the faulty power converter,
the inverter power supply system may use the drive unit (or
referred to as the control unit) to control the on or off state of
the Q1, the Q2, the Q3, or another switch module of the faulty
power converter, to isolate the faulty power converter. This
ensures normal working of another power converter in the inverter
power supply system. This further ensures normal power supply of
the inverter power supply system, improves power supply reliability
of the inverter power supply system, and enhances
applicability.
[0052] FIG. 5 is a schematic flowchart of a troubleshooting method
for a power supply device according to an embodiment of the present
invention. The troubleshooting method provided in this embodiment
of the present invention is applicable to an inverter power supply
system in the power supply device. For a structure of the inverter
power supply system, refer to the schematic diagrams of the
structures shown in FIG. 1 to FIG. 4. Details are not described
herein again. The troubleshooting method provided in this
embodiment of the present invention may include the following
steps.
[0053] S51: Detect a working status of each power converter in the
inverter power supply system.
[0054] S52: Determine whether a module in the inverter power supply
system is faulty. If a module is faulty, perform step S53; if no
module is faulty, continue to perform step S51.
[0055] S53: Detect a faulty component in the faulty module.
[0056] In a specific implementation, the inverter power supply
system may perform operations, such as detecting the faulty power
converter and detecting the faulty module in the power converter,
by using a detection unit and another functional module that are
built in the inverter power supply system. Specifically, for
implementations described in steps S51 to S53, refer to the
implementations described in the foregoing embodiment. Details are
not described herein again.
[0057] S54: If a short circuit component is a C1 or a C2, and the
inverter power supply system is in a battery discharging mode, turn
on a Q2 of the faulty module.
[0058] In a specific implementation, the inverter power supply
system may perform operations, such as controlling a switch module
or another component of the faulty power converter, by using a
control unit and another functional module that are built in the
inverter power supply system. For details, refer to the
implementations described in the foregoing embodiment. Details are
not described herein again.
[0059] Optionally, if a short circuit component in a first module
(for example, a DC/DC power converter 1) is a C1 or a C2, and the
DC/DC power converter 1 is in a battery discharging mode before a
fault occurs, after the DC/DC power converter 1 is faulty, a Q2 of
the DC/DC power converter 1 may be directly turned on, so that an
F1 and an F2 of the DC/DC power converter 1 are blown, to isolate
the DC/DC power converter 1 from another power converter. For
details, refer to the implementations described in the foregoing
embodiment. Details are not described herein again.
[0060] Optionally, it can be learned from the implementations
described in the foregoing embodiment that, if the short circuit
component in the DC/DC power converter 1 is a Q1 or a Q3, the Q2 of
the DC/DC power converter 1 may be directly turned on, so that the
F1 and the F2 of the DC/DC power converter 1 are blown. Further,
the DC/DC power converter 1 may be directly disconnected from a
battery, to disconnect the DC/DC power converter 1 from another
power converter connected in parallel. This ensures normal working
of the another power converter.
[0061] Optionally, the step S54 in this embodiment of the present
invention may be replaced with the following step S54'.
[0062] S54': If a short circuit component is a C1 or a C2, and the
inverter power supply system is in a battery charging mode, turn
off a Q1 and a Q3 of the faulty module, and turn on a Q2 of the
faulty module after a preset time interval.
[0063] Optionally, if the short circuit component in the DC/DC
power converter 1 is the C1 or the C2, and the DC/DC power
converter 1 is in a battery charging mode before the fault occurs,
after the DC/DC power converter 1 is faulty, the Q1 and the Q3 of
the DC/DC power converter 1 may be turned off, and the Q2 of the
DC/DC power converter 1 is turned on after a preset time interval,
so that the F1 and the F2 of the DC/DC power converter 1 are blown,
to isolate the DC/DC power converter 1 from the another power
converter. For a specific implementation, refer to the
implementation described in the foregoing embodiment. Details are
not described herein again.
[0064] In this embodiment of the present invention, the inverter
power supply system may detect a fault in each power conversion
module by using a logical control module, such as the detection
unit (or referred to as a fault detection unit) built in each DC/DC
power converter. After detecting the faulty power converter, the
inverter power supply system may use the control unit (or referred
to as a processing unit or a drive unit) to control an on or off
state of the Q1, the Q2, the Q3, or another switch module of the
faulty power converter, to isolate the faulty power converter. This
ensures normal working of another power converter in the inverter
power supply system, ensures normal power supply of the inverter
power supply system, improves power supply reliability of the
inverter power supply system, and enhances applicability.
[0065] A person of ordinary skill in the art may understand that
all or some of the processes of the methods in the embodiments may
be implemented by a computer program instructing relevant hardware.
The program may be stored in a computer-readable storage medium.
When the program runs, the processes of the methods in the
embodiments are performed. The storage medium includes: any medium
that can store program code, such as a ROM or a random access
memory RAM, a magnetic disk or an optical disc.
* * * * *