U.S. patent application number 16/045217 was filed with the patent office on 2018-11-15 for switch control device and method for power.
The applicant listed for this patent is Cloud Network Technology Singapore Pte. Ltd.. Invention is credited to YU-SHIUAN TSAO, CHIA-PENG WANG.
Application Number | 20180331680 16/045217 |
Document ID | / |
Family ID | 58406889 |
Filed Date | 2018-11-15 |
United States Patent
Application |
20180331680 |
Kind Code |
A1 |
WANG; CHIA-PENG ; et
al. |
November 15, 2018 |
SWITCH CONTROL DEVICE AND METHOD FOR POWER
Abstract
A switch control device includes a switch device and a control
device. The switch device includes first and second input
terminals, an output terminal, a processor, and a plurality of
delays. The processor is configured to detect period of an input
voltage from the first input terminal, and to determine whether the
input voltage is normal. A delay time can be computed by the
processor, according to the period of the input voltage and a
release time of the each delay. If the input voltage from the first
input terminal is abnormal, the processor detects a zero voltage
crossing signal or a peak of voltage signal, and delays the zero
voltage crossover signal or the peak of voltage signal for a delay
time, to control the delays coupled to the first input terminal to
turn on.
Inventors: |
WANG; CHIA-PENG; (New
Taipei, TW) ; TSAO; YU-SHIUAN; (New Taipei,
TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Cloud Network Technology Singapore Pte. Ltd. |
Singapore |
|
SG |
|
|
Family ID: |
58406889 |
Appl. No.: |
16/045217 |
Filed: |
July 25, 2018 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
|
|
14871224 |
Sep 30, 2015 |
|
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16045217 |
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Current U.S.
Class: |
1/1 |
Current CPC
Class: |
H03K 17/136
20130101 |
International
Class: |
H03K 17/13 20060101
H03K017/13 |
Foreign Application Data
Date |
Code |
Application Number |
Sep 25, 2015 |
TW |
104131961 |
Claims
1. A switch control device comprising: at least one switch device
comprising at least one input terminal, at least one switch unit
coupled to a corresponding one of the at least one input terminals,
and an output terminal, wherein each of the at least one switch
unit comprising a first relay unit, a second relay unit, and a
silicon controlled rectifier (SCR) coupled to the second relay unit
in parallel; a control device comprising: a detection unit coupled
to the at least one input terminal, and configured to detect a peak
of wave signal of an input voltage from the at least one input
terminal; a processor coupled to the detection unit and at least
one switch unit, wherein the processor is configured to: receive
the input voltage and the peak of wave signal of the input voltage;
detect a period of the input voltage, and determine whether the
input voltage is normal or not; wherein when the first input
terminal from the first input terminal is abnormal, the processor
computes a delay time according to the period of the input voltage
and a charge time of relays of one switch unit coupled to one input
terminal from at least one input terminal, and controls the relays
to turn on according to the delay time and the peak of wave signal
of the first peak of wave signal of the input voltage.
2. The switch control device of claim 1, wherein the switch device
comprising a first input terminal, a second input terminal, a first
switch unit, and a second switch unit, the first and second switch
unit are coupled to the first and second input terminal
respectively; the output terminal is configured to receive a first
input voltage from the first input terminal through the first
switch unit, or to receive a second input voltage from the second
input terminal through the second switch unit; the detection unit
is coupled to the first and second input terminals, and is
configured to detect a peak of wave signal of the first or second
input voltage; the processor is configured to detect a period of
the first or second input voltage, and detect whether the first or
second input voltage is normal; when the processor detect the first
input voltage is abnormal, the processor computes the delay time
according to the period of the first input voltage and the charge
time of relays of the first switch unit, and controls the relays to
turn on according to the delay time and the peak of wave signal of
the first peak of wave signal of the input voltage.
3. The switch control device of claim 2, wherein the detection unit
comprises a voltage sensor and a peak of wave signal sensor, both
of the voltage sensor and the peak of wave signal sensor are
coupled to the first input terminal, the second input terminal, and
the processor, the voltage sensor is configured to receive the
first or second input voltage, and to transmit the first or second
input voltage to the processor.
4. The switch control device of claim 3, wherein the peak of wave
signal sensor comprises a first peak of wave signal sensor and a
second peak of wave signal sensor, the first peak of wave signal
sensor and the second peak of wave signal sensor are coupled to the
first input terminal and the second input terminal respectively,
the processor is configured to detect the peak of wave signal of
the first input voltage through the first peak of wave signal
sensor, or to detect the peak of wave signal of the second input
voltage through the second peak of wave signal sensor.
5. The switch control device of claim 4, wherein the voltage sensor
comprises a first voltage sensor and a second voltage sensor, the
first voltage sensor and the second voltage sensor are coupled to
the first input terminal and the second input terminal
respectively, the processor is configured to detect whether the
period of the first input voltage is normal or not through the
first voltage sensor, or to detect whether the period of the second
input voltage is normal or not through the second voltage
sensor.
6. The switch control device of claim 5, wherein each of the switch
unit further comprises third and fourth relays, a first silicon
controlled rectifier (SCR), and second SCR; the first and second
relays are coupled in series, and are coupled between a live wire
of the first input terminal and the output terminal or between a
live wire of the second input terminal and the output terminal; the
third and fourth relays are coupled in series, and are coupled
between a neutral wire of the first input terminal and the output
terminal or between a neutral wire of the second input terminal and
the output terminal; a first terminal of the first SCR is coupled
to a node between the first relay and the second relay, a second
terminal of the first SCR is coupled to the output terminal; a
first terminal of the second SCR is coupled to a node between the
third relay and the fourth relay, a second terminal of the second
SCR is coupled to the output terminal; controls terminal of each of
the SCR is coupled to the processor, each of the relays is coupled
to the processor.
7. A switch control device comprising: at least one switch device
comprising at least one input terminal, at least one switch unit
coupled to a corresponding one of the at least one input terminals,
and an output terminal, wherein each of the at least one switch
unit comprising a first relay unit, a second relay unit, and a
silicon controlled rectifier (SCR) coupled to the second relay unit
in parallel; a control device comprising: a detection unit coupled
to the at least one input terminal, and configured to detect a peak
of wave signal of an input voltage from the at least one input
terminal; a processor coupled to the detection unit and at least
one switch unit, wherein the processor is configured to: receive
the input voltage and the peak of wave signal of the input voltage;
detect a period of the input voltage, and determine whether the
input voltage is normal or not; wherein when the first input
terminal from the first input terminal is abnormal, the processor
computes a delay time according to the period of the input voltage
and a charge time of relays of one switch unit coupled to one input
terminal from at least one input terminal, and controls the relays
to turn on according to the delay time and the peak of wave signal
of the first peak of wave signal of the input voltage; wherein the
switch device comprising a first input terminal, a second input
terminal, a first switch unit, and a second switch unit, the first
and second switch unit are coupled to the first and second input
terminal respectively; the output terminal is configured to receive
a first input voltage from the first input terminal through the
first switch unit, or to receive a second input voltage from the
second input terminal through the second switch unit; the detection
unit is coupled to the first and second input terminals, and is
configured to detect a peak of wave signal of the first or second
input voltage; the processor is configured to detect a period of
the first or second input voltage, and detect whether the first or
second input voltage is normal; when the processor detect the first
input voltage is abnormal, the processor computes the delay time
according to the period of the first input voltage and the charge
time of relays of the first switch unit, and controls the relays to
turn on according to the delay time and the peak of wave signal of
the first peak of wave signal of the input voltage.
8. The switch control device of claim 7, wherein the detection unit
comprises a voltage sensor and a peak of wave signal sensor, both
of the voltage sensor and the peak of wave signal sensor are
coupled to the first input terminal, the second input terminal, and
the processor, the voltage sensor is configured to receive the
first or second input voltage, and to transmit the first or second
input voltage to the processor.
9. The switch control device of claim 8, wherein the peak of wave
signal sensor comprises a first peak of wave signal sensor and a
second peak of wave signal sensor, the first peak of wave signal
sensor and the second peak of wave signal sensor are coupled to the
first input terminal and the second input terminal respectively,
the processor is configured to detect the peak of wave signal of
the first input voltage through the first peak of wave signal
sensor, or to detect the peak of wave signal of the second input
voltage through the second peak of wave signal sensor.
10. The switch control device of claim 9, wherein the voltage
sensor comprises a first voltage sensor and a second voltage
sensor, the first voltage sensor and the second voltage sensor are
coupled to the first input terminal and the second input terminal
respectively, the processor is configured to detect whether the
period of the first input voltage is normal or not through the
first voltage sensor, or to detect whether the period of the second
input voltage is normal or not through the second voltage
sensor.
11. The switch control device of claim 10, wherein each of the
switch unit further comprises third and fourth relays, a first
silicon controlled rectifier (SCR), and second SCR; the first and
second relays are coupled in series, and are coupled between a live
wire of the first input terminal and the output terminal or between
a live wire of the second input terminal and the output terminal;
the third and fourth relays are coupled in series, and are coupled
between a neutral wire of the first input terminal and the output
terminal or between a neutral wire of the second input terminal and
the output terminal; a first terminal of the first SCR is coupled
to a node between the first relay and the second relay, a second
terminal of the first SCR is coupled to the output terminal; a
first terminal of the second SCR is coupled to a node between the
third relay and the fourth relay, a second terminal of the second
SCR is coupled to the output terminal; controls terminal of each of
the SCR is coupled to the processor, each of the relays is coupled
to the processor.
Description
FIELD
[0001] The subject matter herein generally relates to a switch
control device and method for power.
BACKGROUND
[0002] A double input power source or a single input power source
usually supplies power to an output through a switch device. The
switch device usually may include a first relay, a second relay,
and a silicon controlled rectifier (SCR) coupled to the first relay
in parallel. However, the switch device will be damaged due to the
SCR operating but not until the second relay is turned on.
BRIEF DESCRIPTION OF THE DRAWINGS
[0003] Implementations of the present technology will now be
described, by way of example only, with reference to the attached
figures.
[0004] FIG. 1 is a block diagram of an embodiment of an switch
control device coupled to a first power source, a second power
source, and an electronic device.
[0005] FIG. 2 is a block diagram of a first embodiment of the
switch control device of FIG. 1.
[0006] FIG. 3 is a circuit diagram of the first embodiment of the
switch control device of FIG. 1, wherein the switch control device
may receive an input voltage, and comprise at least one relay.
[0007] FIG. 4 is a waveform schematic diagram of the input voltage
relating to a first zero crossover signal of the input voltage,
which to determine a delay time of the relay of the first
embodiment of the switch control device of FIG. 1.
[0008] FIG. 5 is a waveform schematic diagram of the input voltage
relating to a second zero crossover signal of the input voltage,
which to determine a time of the relay of the first embodiment of
the switch control device of FIG. 1.
[0009] FIG. 6 is a waveform schematic diagram of the input voltage
relating to a third zero crossover signal of the input voltage,
which to determine a time of the relay of the first embodiment of
the switch control device of FIG. 1.
[0010] FIG. 7 is a schematic diagram of a second embodiment of the
switch control device.
[0011] FIG. 8 is a waveform schematic diagram of the input voltage
relating to a first peak of wave signal of the input voltage, which
to determine a delay time of the relay of the second embodiment of
the switch control device of FIG. 7.
[0012] FIG. 9 is a waveform schematic diagram of the input voltage
relating to a first peak of wave signal of the input voltage, which
to determine a delay time of the relay of the second embodiment of
the switch control device of FIG. 7.
[0013] FIG. 10 is a waveform schematic diagram of the input voltage
relating to a first peak of wave signal of the input voltage, which
to determine a delay time of the relay of the second embodiment of
the switch control device of FIG. 7.
[0014] FIG. 11 is a flow chart diagram of the switch control
device.
DETAILED DESCRIPTION
[0015] It will be appreciated that for simplicity and clarity of
illustration, where appropriate, reference numerals have been
repeated among the different figures to indicate corresponding or
analogous elements. In addition, 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. The drawings are not necessarily to scale and the
proportions of certain parts have been exaggerated to better
illustrate details and features of the present disclosure.
[0016] Several definitions that apply throughout this disclosure
will now be presented.
[0017] 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 coupled or releasably
coupled. 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.
[0018] The disclosure will now be described in relation to an
electronic device with a switch control device for power.
[0019] FIG. 1 illustrates a schematic diagram of an embodiment of
an switch control device 100 coupled to a first power source 300, a
second power source 400, and an electronic device 200. The switch
control device 100 is configured to switch between the first power
source 300 and the second power source 400, to supply voltage from
the first power source 300 or the second power source 400 to the
electronic device 200.
[0020] FIG. 2 illustrates a block diagram of a first embodiment of
the switch control device 100 of FIG. 1. The switch control device
100 includes a switch device 10 and a control device 20. In at
least one embodiment, the switch device 10 is an automatic transfer
switch. The switch device 10 includes a first input terminal 11, a
second input terminal 12, a first switch unit 13, a second switch
unit 14, and an output terminal 15. The first input terminal 11 and
the second input terminal 12 are coupled to the first power source
300 and the second power source 400 respectively. The output
terminal 15 receives a first input voltage from the first power
source 300 through the first input terminal 11, or receives a
second input voltage from the second power source 400 through the
second input terminal 12. The control device 20 includes a
detection unit 23 and a processor 25. The detection unit 23
includes a voltage sensor 230 and a zero crossover signal sensor
231. The voltage sensor 230 includes a first voltage sensor 2301
and a second voltage sensor 2302. The zero crossover signal sensor
231 includes a first zero crossover signal sensor 2310 and a second
zero crossover signal sensor 2312. The first zero crossover signal
sensor 2310 and a second zero crossover signal sensor 2311 and the
first zero crossover signal sensor 2310 are coupled to the first
input terminal 11 and the processor 25. The second voltage sensor
2302 and the second zero crossover signal sensor 2311 are coupled
to the second input terminal 12 and the processor 25. The processor
25 are coupled to the first switch unit 13 and the second switch
unit 14.
[0021] FIG. 3 illustrates a circuit diagram of the first embodiment
of the switch control device 100 of FIG. 1. Both of the first input
terminal 11 and the second input terminal 12 are coupled to the a
municipal electric power. The first switch unit 13 includes first
level relay unit and a second level relay unit. The first level
relay unit of the first switch unit 13 includes relays R1 and R2.
The second level relay unit of the first switch unit 13 includes
relays R3 and R4, and two silicon controlled rectifiers (SCRs) S1
and S2. The two SCRs S1 and S2 are coupled to the relays R3 and R4
in parallel. The second switch unit 14 includes first level relay
unit and a second level relay unit. The first level relay unit of
the second switch unit 14 includes relays R5 and R6. The second
level relay unit of the second switch unit 14 includes relays R7
and R8, and two silicon controlled rectifiers (SCRs) S3 and S4. The
two SCRs S3 and S4 are coupled to the relays R7 and R8 in parallel.
The relays R1 and R2 are coupled in series, and are coupled between
a live wire L1 of the municipal electric power and the output
terminal 15. The relays R3 and R4 are coupled in series, and are
coupled between a neutral wire N1 of the municipal electric power
and the output terminal 15. Each of the SCR is composed of two
single thyristors coupled in parallel. A first terminal of the SCR
S1 is coupled to a node between the relay R1 and the relay R2. A
second terminal of the SCR S1 is coupled to the output terminal 15.
A second terminal of the SCR S2 is coupled to a node between the
relay R3 and the relay R4. A second terminal of the SCR S2 is
coupled to the output terminal 15. The relays R5 and R6 are coupled
in series, and are coupled between a live wire L2 of the municipal
electric power and the output terminal 15. The relays R7 and R8 are
coupled in series, and are coupled between a neutral wire N2 of the
municipal electric power and the output terminal 15. A first
terminal of the SCR S3 is coupled to a node between the relays R5
and R6. A second terminal of the SCR S3 is coupled to the output
terminal 15. A first terminal of the SCR S4 is coupled to the node
between the relays R7 and R8. A second terminal of the SCR S4 is
coupled to the output terminal 15.
[0022] The processor 25 includes a control chip 250, a relay driver
251, and a SCR driver 252. Each of the relays R1, R2, R3, R4, R5,
R6, R7, and R8 is coupled to the processor 25 through the relay
driver 251. Each control terminal of the SCR S1, S2, S3, and S4 is
coupled to the processor 25 through the SCR driver 252. The relay
driver 251 and the SCR driver 252 can make functions as adjusting
voltages of the relays R1, R2, R3, R4, R5, R6, R7, and R8 and the
SCR S1, S2, S3, and S4.
[0023] In at least one embodiment, the SCR S1 and S2 can promote a
transmission time from the first input terminal 11 to the output
terminal 15. The SCR S3 and S4 can promote a transmission time from
the second input terminal 12 to the output terminal 15. Each of the
SCR can reduce a voltage drop of the corresponding relay coupled in
parallel. Therefore, arc discharge generated by the relays R2, R4,
R6, R8 can be reduced.
[0024] In use, when the output terminal 15 receives a first input
voltage from the first input terminal 11, the first voltage sensor
2301 senses the first input voltage, and transmits the first input
voltage to the processor 25. The first zero crossover signal sensor
2310 senses a zero crossover signal of the first input voltage, and
transmits the zero crossover signal of the first input voltage to
the processor 25. The processor 25 detects a period T of the first
input voltage through the first voltage sensor 2301, and determines
whether the first input voltage is normal or not. If the first
input voltage is abnormal, the processor 25 computes a delay time
T.sub.Delay according to the period T of the first input voltage
and a charge time T.sub.Operate of relays R1 and R3 of the first
level relay unit of the first switch unit 13, and determines when
to output a control signal to turn on the relays R1 and R3 of the
first switch unit 13 according to the delay time T.sub.Delay and
the zero crossover signal of the first input voltage. Therefore, a
voltage generated by the operation of turn on the relays R1 and R3
instantly will be reduce.
[0025] Each relay usually includes a coil and a plurality of
contacts. In at least one embodiment, the charge time T.sub.Operate
is a period started from the coil of one relay receiving a turn on
signal until the contacts of the relay contacting to each other,
and the delay time T.sub.Delay is a period between the processor 25
detects the zero crossover signal (ZCD) of the first input voltage
and outputs control signal to the relays, to make the relays to
disconnect.
[0026] FIGS. 4 to 6 illustrates waveform schematic diagrams of the
first input voltage relating to three forms of zero crossover
signal (ZCD) of the first input voltage, which make the processor
25 to determine when to output the delay time T.sub.Delay of each
relay (Delay) of the first switch unit 13. In at least one
embodiment, a relationship between the T.sub.Delay and the
T.sub.Operate as formula: T.sub.Delay=T-T.sub.Operate.
[0027] Therefore, the processor 25 detects the zero crossover
signal (ZCD) of the first input voltage and outputs the control
signal to the relays R1 and R3 of the first switch unit 13 after
the delay time T.sub.Delay, to make the relays R1 and R3 operating.
When the contacts of the relays R1 and R3 of the first switch unit
13 coupled to the first input terminal 11 turn on, and then the
relays R2 and R4 will be turned on after a few time. Therefore, a
voltage generated by the operation of turn on the relays R1 and R3
instantly will be reduce, which will avoid the SCRs S1 and S2 are
turned on not until the relays R2 and R4 are operating.
[0028] In at least one embodiment, the zero crossover signal of the
first input voltage is a signal of the sinusoidal wave of the first
input voltage approach to an abscissa axis.
[0029] FIG. 7 illustrates a schematic diagram of a second
embodiment of the switch control device 100. Difference from the
first embodiment of the switch control device 100 is that, the
detection unit 23 includes the voltage sensor 230 and a peak of
wave signal sensor 233. The peak of wave signal sensor 233 includes
a first peak of wave signal sensor 2330 and a second peak of wave
signal sensor 2331. The first peak of wave signal sensor 2330 and
the second peak of wave signal sensor 2331 are configured to
receive the first input voltage and the second input voltage
respectively, and detects peak of wave signal of the first or
second input voltage, to transmit the peak of wave signal of the
first or second input voltage to the processor 25.
[0030] In at least one embodiment, operation principle of the
switch control device 100 in the first embodiment is similar as
that of the second embodiment. When the output terminal 15 receives
a first input voltage from the first input terminal currently, the
first voltage sensor 2301 detects the first input voltage from the
first input terminal 11, and transmits the first voltage to the
processor 25. The first peak of wave signal sensor 2330 detects the
peak of wave signal of the first input voltage, and outputs the
peak of wave signal to the processor 25. The processor 25 detects
the period T of the first input voltage through the first voltage
sensor 2301, and determines whether the first input voltage is
normal or not. If the first input voltage is abnormal, the
processor 25 computes a delay time T.sub.Delay according to the
period T of the first input voltage and the charge time
T.sub.Operate of each relay of the first switch unit 13, and
determines when to output a control signal to turn on the relays R1
and R3 of the first switch unit 13 according to the delay time
T.sub.Delay and the peak of wave signal of the first input
voltage.
[0031] FIGS. 8 to 10 illustrates waveform schematic diagrams of the
first input voltage relating to three forms of peak of wave signal
(PKD) of the first input voltage, which make the processor 25 to
determine when to output the delay time T.sub.Delay of relays R1
and R3 (Delay) of the first switch unit 13. In at least one
embodiment, a relationship between the T.sub.Delay and the
T.sub.Operate as formula: T.sub.Delay=3T/4-T.sub.Operate.
[0032] Therefore, the processor 25 detects the peak of wave signal
(PKD) of the first input voltage and outputs the control signal to
the relays R1 and R3 of the first switch unit 13 after the delay
time T.sub.Delay. When the contacts of the relays R1 and R3 of the
first switch unit 13 coupled to the first input terminal 11 are
turned on, and then the relays R2 and R4 will be turned on after a
few time. Therefore, a voltage generated by the operation of turn
on the relays R1 and R3 instantly will be reduce, which will avoid
the SCRs S1 and S2 are turned on not until the relays R2 and R4 are
operating.
[0033] Referring to FIG. 11, a flowchart is presented in accordance
with an example embodiment of a switch control device 100 which is
being thus illustrated. The example method is provided by way of
example, as there are a variety of ways to carry out the method.
The method described below can be carried out using the
configurations illustrated in FIGS. 1, 2, 3, and 7. The exemplary
method can be executed by an switch control device 100, and can
begin at block 1101.
[0034] At block 1101, the voltage sensor 230 receives the first
input voltage from the first input terminal.
[0035] At block 1102, a sensor, such as the zero crossover signal
sensor 231 or the peak of wave signal sensor 233 senses the zero
crossover signal or the peak of wave signal of the first input
voltage.
[0036] At block 1103, the processor 25 receives the first input
voltage from the voltage sensor 230.
[0037] At block 1104, the processor 25 detects the period T of the
first input voltage.
[0038] At block 1105, the processor 25 determines whether the first
input voltage is normal or not, If the first input voltage is
abnormal, the process goes to block 1105, otherwise, the process
goes to block 1101.
[0039] At block 1106, the processor 25 computes a delay time
T.sub.Delay according to the period T of the first input voltage
and the charge time T.sub.Operate of the relay of the first switch
unit 13.
[0040] At block 1107, the processor 25 determines when to output a
control signal to turn on the relays R1 and R2 of the first switch
unit 13 according to the delay time T.sub.Delay and the zero
crossover or peak of wave signal of the first input voltage.
[0041] When the second input terminal 12 transmits the second input
voltage from the second source S2 to the output terminal 15 through
the second switch unit 14, and the second voltage sensor 2302
operates, the principle is similar to the first input terminal 11
transmits the first input voltage from the first source S1 to the
output terminal 15 through the first switch unit 13, and the first
voltage sensor 2301 operates.
[0042] 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.
* * * * *