U.S. patent application number 14/808813 was filed with the patent office on 2017-01-26 for fan control circuit and an electronic device using the same.
The applicant listed for this patent is HON HAI PRECISION INDUSTRY CO., LTD., HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD. Invention is credited to GUO-YI CHEN, LEI LIU.
Application Number | 20170022995 14/808813 |
Document ID | / |
Family ID | 57837168 |
Filed Date | 2017-01-26 |
United States Patent
Application |
20170022995 |
Kind Code |
A1 |
LIU; LEI ; et al. |
January 26, 2017 |
FAN CONTROL CIRCUIT AND AN ELECTRONIC DEVICE USING THE SAME
Abstract
A fan control circuit set in an electronic device, the fan
control circuit includes a fan, a controller, a power supply, and a
timer. The fan operates normally when the fan receives a control
signal and a voltage. The controller outputs the control signal.
The power supply supplies power. The timer is coupled between the
fan, the controller, and the power supply. A first input of the
timer is coupled to the controller to receive the control signal.
When a second input of the timer receives a first signal from the
power supply, the first input of the timer is coupled to an output
of the timer. When the second input of the timer receives a second
signal from the power supply, the second input of the timer is
disconnected from the output of the timer after a preset time.
Inventors: |
LIU; LEI; (Shenzhen, CN)
; CHEN; GUO-YI; (Shenzhen, CN) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
HONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD
HON HAI PRECISION INDUSTRY CO., LTD. |
Shenzhen
New Taipei |
|
CN
TW |
|
|
Family ID: |
57837168 |
Appl. No.: |
14/808813 |
Filed: |
July 24, 2015 |
Current U.S.
Class: |
1/1 |
Current CPC
Class: |
F04D 27/004
20130101 |
International
Class: |
F04D 27/00 20060101
F04D027/00 |
Claims
1. A fan control circuit comprising: a fan configured to operate
normally in event the fan receives a control signal and power; a
controller configured to output the control signal; a power supply
configured to supply power; a timer coupled to the fan and the
power supply, the timer comprising a first input and a second
input, the first input coupled to the controller and configured to
receive the control signal; wherein when a second input of the
timer receives a first signal from the power supply, the first
input of the timer is coupled to an output of the timer; when the
second input of the timer receives a second signal from the power
supply, the first input of the timer is disconnected from the
output of the timer after a preset time.
2. The fan control circuit as claim 1, wherein the controller is a
baseboard management controller.
3. The fan control circuit as claim 1, wherein the control signal
is a pulse-width modulation signal.
4. The fan control circuit as claim 1, wherein a first output of
the power supply is coupled to a power terminal of the fan, a
second output of the power supply is coupled to the second input of
the timer.
5. The fan control circuit as claim 4, further comprising a voltage
converter, an input of the voltage converter is coupled to the
second output of the power supply, an output of the voltage
converter is coupled to the power terminal of the fan, wherein when
the electronic device is operating, the power supply outputs a
first voltage which is at a high level to the voltage converter,
the voltage converter converts the first voltage into a second
voltage and outputs the second voltage to the power terminal of the
fan, when the electronic device stops operating, the power supply
outputs the second voltage to the fan through the first output.
6. An electronic device comprising a fan control circuit, the fan
control circuit comprising: a fan operating normally when the fan
receives a control signal and a voltage; a controller configured to
output the control signal; a power supply configured to supply
power; a timer coupled to the fan and the power supply, wherein a
first input of the timer is coupled to the controller to receive
the control signal, when a second input of the timer receives a
first signal from the power supply, the first input of the timer is
coupled to an output of the timer; when the second input of the
timer receives a second signal from the power supply, the first
input of the timer is disconnected from the output of the timer
after a preset time.
7. The electronic device as claim 6, wherein the controller is a
baseboard management controller.
8. The electronic device as claim 6, wherein the control signal is
a pulse-width modulation signal.
9. The electronic device as claim 6, wherein a first output of the
power supply is coupled to a power terminal of the fan, a second
output of the power supply is coupled to the second input of the
timer.
10. The electronic device as claim 9, further comprising a voltage
converter, an input of the voltage converter is coupled to the
second output of the power supply, an output of the voltage
converter is coupled to the power terminal of the fan, wherein when
the electronic device is operating, the power supply outputs a
first voltage which is at a high level to the voltage converter,
the voltage converter converts the first voltage into a second
voltage and outputs the second voltage to the power terminal of the
fan, when the electronic device stops operating, the power supply
outputs the second voltage to the fan through the first output.
Description
FIELD
[0001] The subject matter herein generally relates to an electronic
device with a fan control circuit.
BACKGROUND
[0002] A power supply stops supplying power for fans when a server
is shut down.
BRIEF DESCRIPTION OF THE DRAWING
[0003] Implementations of the present technology will now be
described, by way of example only, with reference to the attached
FIGURE.
[0004] The FIGURE is a block diagram of an embodiment of an
electronic device with a fan control circuit.
DETAILED DESCRIPTION
[0005] Numerous specific details are set forth in order to provide
a thorough understanding of the embodiments described herein.
However, it will be understood by those of ordinary skill in the
art that the embodiments described herein can be practiced without
these specific details. In other instances, methods, procedures,
and components have not been described in detail so as not to
obscure the related relevant feature being described. Also, the
description is not to be considered as limiting the scope of the
embodiments described herein.
[0006] Several definitions that apply throughout this disclosure
will now be presented.
[0007] The term "coupled" is defined as connected, whether directly
or indirectly through intervening components, and is not
necessarily limited to physical connections. The connection can be
such that the objects are permanently connected or releasably
connected. The term "comprising" when utilized, means "including,
but not necessarily limited to"; it specifically indicates
open-ended inclusion or membership in the so-described combination,
group, series and the like.
[0008] The FIGURE shows an embodiment of a fan control circuit 100
applied in an electronic device 200. The fan control circuit 100
can comprise a fan 20, a baseboard management controller (BMC) 30,
a timer 40, a power supply 50, and a voltage converter 60. The fan
control circuit 100 can be set in a server.
[0009] The BMC 30 can comprise an output O1. The output O1 is
configured to output a power wide management (PWM) signal to
control the fan 20.
[0010] The fan 20 can comprise a control terminal C and a power
terminal P. The control terminal C is configured to receive the PWM
signal. The power terminal P is configured to receive a voltage.
The fan operates normally when the fan receives the PWM signal and
the voltage.
[0011] The timer 40 can comprise a first input I1 and a second
input I2. The power supply 50 can comprise a first output O3 and a
second output O4. The first input I1 of the timer 40 is coupled to
the output O1 of the BMC 40 to receive the PWM signal. The second
input I2 of the timer 40 is coupled to the second output O4 of the
power supply 50. An output O2 of the timer 40 is coupled to the
control terminal C of the fan 20 to transmit the PWM signal.
[0012] When the second input I2 is at a high level, the first input
I1 of the timer 40 is coupled to the output O2 of the timer 40.
When the second input I2 turns into a low level, a connection
between the first input I1 and the output O2 would be disconnected
after a preset time.
[0013] The first output O3 of the power supply 50 is coupled to an
anode of a diode D. A cathode of the diode D is coupled to the
power terminal P of the fan 20. The diode D is configured to
protect the power supply 50.
[0014] An input I2 of the voltage converter 60 is coupled to the
second output O4 of the power supply 50. An output O5 of the
voltage converter 60 is coupled to the power terminal P of the fan
20 and the cathode of the diode D.
[0015] When the server is operating, the power supply outputs a
first voltage through the second output O4. The first voltage is 12
volt (V) in this embodiment. The second input I2 of the timer 40 is
at a high level and the timer 40 transmits the PWM signal from the
BMC 30 to the control terminal C of the fan 20. The input 13 of the
voltage converter 60 receives the first voltage. The voltage
converter 60 converts the first voltage into a second voltage. The
voltage converter outputs the second voltage to the power terminal
P of the fan 20 through the output O5.
[0016] In the embodiment, the second voltage is 5 V. The fan 20
operates normally when the fan 20 receives the PWM signal and the
second voltage synchronously.
[0017] When the server stops operating, the BMC 30 outputs a
constant PWM signal. The power supply 50 stops outputting the first
voltage through the second output O4, and starts outputting a third
voltage through the first output O3. In the embodiment the third
voltage is an auxiliary voltage of 5 V. The second input I2 of the
timer 40 is at a low level. The timer 40 starts timing and
continues to transmit the PWM signal to the control terminal C of
the fan 20 in a preset time. The fan 20 receives the PWM signal and
the second voltage synchronously. The timer 40 stops transmitting
the PWM signal to the fan 20 after the preset time.
[0018] In other embodiments, when the server is operating, the
power supply 50 outputs the first voltage through the second output
O4 and outputs the third voltage to the power terminal P of the fan
20 through the first output O3 at the same time.
[0019] While the disclosure has been described by way of example
and in terms of the embodiment, it is to be understood that the
disclosure is not limited thereto. On the contrary, it is intended
to cover various modifications and similar arrangements as would be
apparent to those skilled in the art. Therefore, the range of the
appended claims should be accorded the broadest interpretation so
as to encompass all such modifications and similar
arrangements.
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