CN110854801A - High-power special power supply fault interlocking protection device based on PLC - Google Patents
High-power special power supply fault interlocking protection device based on PLC Download PDFInfo
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- 239000013307 optical fiber Substances 0.000 claims abstract description 44
- 230000005540 biological transmission Effects 0.000 claims description 13
- 238000004891 communication Methods 0.000 claims description 11
- 238000006243 chemical reaction Methods 0.000 claims description 10
- 230000000087 stabilizing effect Effects 0.000 claims description 10
- 239000000835 fiber Substances 0.000 claims description 9
- 239000003990 capacitor Substances 0.000 claims description 8
- 238000005516 engineering process Methods 0.000 abstract description 3
- 101100190617 Arabidopsis thaliana PLC2 gene Proteins 0.000 description 17
- 101100408456 Arabidopsis thaliana PLC8 gene Proteins 0.000 description 17
- 101100464304 Caenorhabditis elegans plk-3 gene Proteins 0.000 description 17
- 101100093534 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) RPS1B gene Proteins 0.000 description 17
- 230000003287 optical effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
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- 239000002245 particle Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/02—Details
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0061—Details of emergency protective circuit arrangements concerning transmission of signals
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Abstract
The invention belongs to the technical field of electrical technology and power electronics, and discloses a high-power special power supply fault interlocking protection device based on a PLC (programmable logic controller), which aims to solve the problem of fault interlocking protection of a power supply in the prior art. The invention adopts the optical fiber to transmit the fault information between the single power supplies in the form of light, isolates the electromagnetic interference between the power supplies and further improves the working reliability of the power supply system.
Description
Technical Field
The invention relates to the technical field of electrical technology and power electronics, in particular to a high-power special power supply fault interlocking protection device based on a PLC.
Background
With the continuous development of scientific research and medical particle accelerator technology, the requirements on accelerator power supplies are higher and higher, the power supplies have the characteristics of high precision, large capacity, small ripple, high reliability and diversified output current waveforms, and the power supplies usually work cooperatively in a series, parallel or series-parallel combination mode. In the conventional power supply system, the fault chain between the power supplies is only transmitted in a communication mode, and signals are transmitted through wire connection, so that electromagnetic interference is often caused to be transmitted between the power supplies, and great troubles are brought to the precision and measurement of the power supplies. In a large-voltage and large-current power supply system, along with the increase of the number of power supplies, the requirement on the working reliability of the whole power supply is higher and higher, and the requirement on the response speed of each power supply to faults is higher and higher. The power supply faults are interlocked through a complex CAN bus communication mode, the working requirement of the whole accelerator power supply system cannot be met, and the technical problem cannot be solved in the prior art.
Disclosure of Invention
The invention aims to solve the problem of fault interlocking protection of a special power supply of a high-power particle accelerator in the prior art, and provides a PLC-based high-power special power supply fault interlocking protection device for transmitting faults between power supplies in an optical mode.
In order to achieve the purpose, the invention adopts the following technical scheme:
a high-power special power supply fault interlocking protection device based on a PLC (programmable logic controller) comprises a master controller and a slave controller connected with the master controller, wherein the slave controller is connected with the PLC, a fault input point of the PLC is connected with a fault receiving circuit, a reset output point of the PLC is connected with a fault reset circuit, the other end of the fault receiving circuit is connected with an external fault transmission optical fiber, a power interface of the fault receiving circuit is connected with a voltage conversion circuit, the voltage conversion circuit is connected with a power supply indicating circuit, and the power supply indicating circuit is connected with a 24V power supply; the fault output point of the PLC is connected with a fault sending circuit, the fault sending circuit is connected with an external fault transmission optical fiber, the external fault transmission optical fiber is connected with a next fault receiving circuit, and a fault holding circuit is connected between the fault receiving circuit and the fault sending circuit.
Furthermore, the power supply indicating circuit comprises an eighth resistor and a light emitting diode which are connected in series, the eighth resistor and the first light emitting diode are connected in series and then respectively connected with the first filter capacitor and the second filter capacitor in parallel on the 24V power supply, the eighth resistor is connected with the anode of the 24V power supply, and the first light emitting diode is connected with the cathode of the 24V power supply.
Further, the voltage conversion circuit comprises a first resistor connected with the anode of the 24V power supply, the first resistor is connected with a second resistor, the second resistor is connected with the cathode of a voltage stabilizing diode, the anode of the voltage stabilizing diode is connected with the cathode of the 24V power supply, and a 5V power supply output end is connected between the second resistor and the voltage stabilizing diode.
Furthermore, the fault receiving circuit comprises a receiving optical fiber head, a VCC terminal of the receiving optical fiber head is connected with a fifth resistor, the end of the fifth resistor is also connected with the positive electrode of the 5V power supply, and the other end of the fifth resistor is connected with an OUT terminal of the receiving optical fiber head; receive between the VCC terminal of optical fiber head and the GND terminal still parallelly connected have first electric capacity, still parallelly connected be equipped with first diode between the OUT terminal of receiving optical fiber head and the ground wire, the second electric capacity, and the anode ground of first diode, the OUT terminal of receiving optical fiber head still is connected with the base of a triode, the collecting electrode ground connection of a triode, the projecting pole of a triode is connected with No. 2 ends of opto-coupler, receive the positive pole of 5V power after No. 1 end and the sixth resistance series connection of opto-coupler, the positive pole of No. 4 termination 24V power of opto-coupler, No. 3 ends of opto-coupler are fault signal's output point, connect PLC's fault input point.
Furthermore, the fault sending circuit comprises a sending optical fiber head, terminals 2,6 and 7 of the sending optical fiber head are connected with a fourth resistor, the fourth resistor is connected with a third resistor, the third resistor is connected with a fault output point of the PLC, a terminal 3 of the sending optical fiber head is connected with an anode of a second light emitting diode, and a cathode of the second light emitting diode is grounded.
Furthermore, the fault holding circuit comprises a seventh resistor connected with the OUT terminal of the receiving optical fiber head, the other end of the seventh resistor is connected with the base electrode of the second triode, the emitting electrode of the second triode is grounded, and the collecting electrode of the second triode is connected with the fault resetting circuit.
Further, the fault reset circuit is a relay, the No. 4 end of the relay is connected with the collector electrode of the second triode, the No. 6 end of the relay is further connected between the third resistor and the fourth resistor through an XSI terminal, the No. 1 end of the relay is connected with the reset output point of the PLC, the No. 16 terminal of the relay is grounded, the normally open contact 13 of the relay is connected with the positive electrode of the 24V power supply, and the normally open contact 9 of the relay is connected with the third resistor.
Further, the PLC is in communication connection with the master controller through the slave controller.
Compared with the prior art, the invention has the following beneficial effects:
in a special power supply of a high-power accelerator, a power supply usually has a plurality of single power supplies working cooperatively in a series connection, parallel connection or series-parallel connection combination mode, and a control mode usually adopts master control and slave control, namely, one master controller controls a plurality of slave controllers through communication, the slave controllers control a PLC through communication, and the PLC controls other equipment. When equipment of a certain single power supply breaks down, the PLC of the single power supply uploads fault information to a corresponding slave controller through communication, the slave controller uploads the fault information to the master controller through communication, the master controller processes the fault information and then issues the fault information to slave controllers of other single power supplies, the slave controllers issue the fault information to corresponding PLC again for processing, when the fault information is transmitted through communication, the fault information is processed by a plurality of controllers and the PLC, information transmission delay is generated, the fault information is likely to be lost, and the equipment in a power supply system of the high-power accelerator cannot be protected in time.
The fault interlocking protection device directly links the fault information of the single power supply in series through the PLC of the single power supply to form another fault transmission channel to form double protection with communication transmission, thereby greatly improving the reliability of the high-power special power supply, accelerating the response speed of the power supply to the fault, effectively protecting the power supply in time and further reducing the occurrence rate of accidents.
The fault interlocking protection device adopts optical fibers to transmit fault information between the single power supplies in an optical mode, isolates electromagnetic interference between the power supplies, and further improves the working reliability of a power supply system.
The fault interlocking protection device has the functions of fault information keeping and resetting, when one power supply fault information in the cooperative single power supplies is not released, other single power supplies cannot be switched on due to the action of fault interlocking, and the main controller is used for uniformly issuing the reset information to ensure that all power supplies can be normally switched on after being reset after the fault is eliminated, so that the safety of personnel and equipment is ensured to a certain extent.
The fault interlocking protection device adopts a modular design, has a standard external interface, and can be randomly configured and installed according to the number of the single power supplies to carry out fault interlocking, so that the installation, debugging and maintenance are more convenient and faster.
Drawings
Fig. 1 is a schematic diagram of a power conversion circuit of the present invention.
Fig. 2 is a schematic diagram of the fault-chain protection device of the present invention.
Fig. 3 is a system block diagram of the application of the invention.
The reference numerals have the following meanings: 1. a main controller; 2, PLC; 3. a fault receiving circuit; 4. a fault transmitting circuit; 5. a fault holding circuit; 6. a fault reset circuit; 7. and a slave controller.
Detailed Description
The invention is further described with reference to the following figures and detailed description.
As shown in fig. 1-3, the high-power special power supply failure interlock protection device based on the PLC includes a main controller 1 and a plurality of PLCs 2 connected with the main controller 1, and the PLC2 is in communication connection with the main controller through a slave controller 7. A fault input point of the PLC2 is connected with a fault receiving circuit 3, a fault reset circuit 6 is connected with a reset output point of the PLC2, the other end of the fault receiving circuit 3 is connected with an external fault transmission optical fiber, a power interface of the fault receiving circuit 3 is connected with a voltage conversion circuit, the voltage conversion circuit is connected with a power supply indicating circuit, and the power supply indicating circuit is connected with a 24V power supply; a fault output point of the PLC2 is connected to a fault transmitting circuit 4, the fault transmitting circuit 4 is connected to an external fault transmission optical fiber, the external fault transmission optical fiber is connected to a next fault receiving circuit 3, and a fault holding circuit 5 is connected between the fault receiving circuit 3 and the fault transmitting circuit 4.
As shown in fig. 1, the power indication circuit includes an eighth resistor R8 and a light emitting diode V2 connected in series, and the eighth resistor R8 is connected in series with the first light emitting diode V2 and then connected in parallel with the first filter capacitor C01 and the second filter capacitor C03 respectively on the 24V power supply, and the eighth resistor R8 is connected to the positive pole of the 24V power supply, and the first light emitting diode V2 is connected to the negative pole of the 24V power supply.
The voltage conversion circuit comprises a first resistor R1 connected with the anode of the 24V power supply, a second resistor R2 is connected with the first resistor R1, the cathode of a voltage stabilizing diode V1 is connected with the second resistor R2, the anode of a voltage stabilizing diode V1 is connected with the cathode of the 24V power supply, and a 5V power supply output end is connected between the second resistor R2 and the voltage stabilizing diode V1.
The fault interlocking protection device adopts a 24V power supply for power supply, and when the fault interlocking protection device works, the 24V power supply is filtered by a first filter capacitor C01 and a second filter capacitor C03, then is subjected to current limiting by a first resistor R1 and a second resistor R2, and is converted into 5V voltage required by a circuit by a voltage stabilizing diode V1; the power supply indicating circuit consisting of the eighth resistor R8 and the first light emitting diode V2 can display whether the voltage of the power supply is normal or not in real time.
As shown in fig. 2, the fault receiving circuit 3 includes a receiving fiber head U1, a VCC terminal of the receiving fiber head U1 is connected to a fifth resistor R5, this end of the fifth resistor R5 is also connected to the positive electrode of the 5V power supply, and the other end of the fifth resistor R5 is connected to an OUT terminal of the receiving fiber head U1; receive between VCC terminal and the GND terminal of optic fibre head U1 still parallelly connected first electric capacity C1, still parallelly connected be equipped with first diode V6, second electric capacity C2 between OUT terminal and the ground wire of receiving optic fibre head U1, and the positive pole ground connection of first diode V6, the OUT terminal of receiving optic fibre head U1 still is connected with the base of a triode V3, the collector ground connection of a triode V3, the projecting pole of a triode V3 is connected with opto-coupler V4's No. 2 end, the anodal of 5V power is received after establishing ties with sixth resistance R6 to the No. 1 end of opto-coupler V4, the anodal of 24V power is terminated to No. 4 of opto-coupler V4, the output point of No. 3 end of opto-coupler V4 for fault signal, connect PLC 2's fault input point.
The fault sending circuit 4 comprises a sending optical fiber head U2, wherein terminals 2,6 and 7 of the sending optical fiber head U2 are connected with a fourth resistor R4, a fourth resistor R4 is connected with a third resistor R3, the third resistor R3 is connected with a fault output point of the PLC2, a terminal 3 of the sending optical fiber head U2 is connected with an anode of a second light-emitting diode V7, and a cathode of the second light-emitting diode V7 is grounded.
The fault holding circuit 5 comprises a seventh resistor R7 connected with an OUT terminal of a receiving optical fiber head U1, the other end of the seventh resistor R7 is connected with a base electrode of a second triode V5, an emitting electrode of the second triode V5 is grounded, and a collecting electrode of a second triode V5 is connected with a reset circuit.
The fault reset circuit 6 is relay K1, relay K1's No. 4 end is connected with triode V5's No. two collecting electrodes, relay K1's No. 6 end still passes through the XSI terminal and connects between third resistance R3 and fourth resistance R4, relay K1's No. 1 end is connected with PLC 2's reset output point, relay K1's No. 16 terminal ground connection, relay K1's normally open contact 13 connects the positive pole of 24V power, relay K1's normally open contact 9 is connected with third resistance R3.
Port description of PLC 2: the fault output point Q0.1 outputs a low level as fault and outputs a high level as no fault; the reset output point Q0.2 outputs low level without resetting and outputs high level reset; the fault receiving point I0.1 receives a fault of the low level, and the receiving of the high level is no fault.
The system is initialized, when working, the whole system is initialized by using a reset signal, namely, the main controller 1 sends a reset signal to the PLC2 from the controller 7, so that a reset output point Q0.2 of the PLC2 outputs a high-level (time is 1 s) reset signal, the reset relay K1 is attracted after receiving the reset signal, so that normally open contacts 13 and 9 of a reset relay K1 are closed, normally closed contacts 4 and 6 are disconnected, at the moment, a 24V power supply is connected with a fault sending circuit 4 through contacts 13 and 9 of a relay K1, and a sending optical fiber head U2 starts to emit light and transmits the light through an optical fiber; meanwhile, a receiving optical fiber head U1 in the fault receiving circuit 3 receives optical signals sent by other fault interlocking devices, when the receiving optical fiber head U1 receives the optical signals, the end 6 of the receiving optical fiber head U1 outputs low level, a first triode V3 is conducted, the optocoupler V4 is conducted, 24V (high level) is sent to a fault receiving point I0.1 of the PLC2 through the optocoupler V4, the PLC2 detects no fault, then a fault output point Q0.1 outputs high level, the sending optical fiber head U2 continues to emit light, at the moment, a reset signal disappears, the relay K1 restores to an initial state (normally open contacts 13 and 9 are disconnected, normally closed contacts 4 and 6 are closed), and therefore the whole fault-free information system is established and the system initialization work is completed.
When the single power supply equipment has a fault, the local PLC2 processes the received fault information and outputs low level 0V at a fault output point Q0.1, at the moment, the sending optical fiber head U2 does not emit light because of no driving current, and the fault information is transmitted to a receiving circuit of a fault interlocking device of other single power supplies through an external fault transmission optical fiber.
When the single power supply receives the fault information of other single power supplies, the No. 6 end of the receiving optical fiber head U1 outputs high level because the optical signal can not be received, so that the first triode V3 is turned off, and the second triode V5 is turned on; after the first triode V3 is turned off, the optocoupler V4 is also turned off, so that 24V cannot be sent to a fault receiving point I0.1 of the PLC2, the fault receiving point I0.1 receives a low level, fault information is transmitted to the local PLC2, meanwhile, after the second triode V5 is turned on, the potential between the third resistor R3 and the fourth resistor R4 is forcibly pulled to 0V through the normally closed points 4 and 6 of the relay K1 and XS1 (short circuit), at the moment, no matter whether the fault output point Q0.1 of the PLC2 is the low level or not, the transmitting optical fiber head U2 cannot emit light, and therefore the fault interlocking protection device directly crosses the processing of the PLC2 to directly transmit the received fault information to the next monomer power supply through a hardware circuit.
According to the fault maintaining principle, when a fault occurs, because the receiving optical fiber head U1 cannot receive an optical signal, the port 6 outputs a high level, the second triode V5 is always conducted, the potential between the first resistor R3 and the second resistor R4 is forcibly pulled to 0V, the sending optical fiber head U2 cannot emit light, the fault is maintained, and until reset information exists, the normally closed contacts 4 and 6 are disconnected due to the attraction of the relay K1, the potential between the first resistor R3 and the second resistor R4 can be maintained, and the interlocking information of the system fault can be eliminated.
FIG. 3 is a schematic diagram of a system applied to a fault interlock protection device in a high-power special power system according to the present invention, when a fault occurs in a device of a No. 1 single power source, a PLC2 of the No. 1 power source processes the fault information and sends the fault information to a fault sending circuit 4 of the No. 1 power source through a fault output point thereof, the fault sending circuit 4 converts the fault information into an optical signal and sends the optical signal to a fault receiving circuit 3 of the No. 2 single power source, the fault receiving circuit 3 converts the received optical information into an electrical signal and sends the electrical signal to a PLC2 of the No. 2 power source for processing, and simultaneously, the signal is latched and sent to the fault sending circuit 4 through a fault holding circuit 5, and the fault sending circuit 4 sends the fault information to a next power source, so that even if no fault information is sent by the PLC2 of the No. 2 power source, the fault information is still continuously transmitted through a hardware circuit and directly spans the processing of, until all power supplies receive the fault message. After the fault is eliminated, the master controller 1 is enabled to uniformly send reset signals to the slave controllers 7 of all power supplies by the upper computer, the slave controllers 7 send the reset signals to the corresponding PLCs, and the PLCs send the reset signals to the fault chain protection devices corresponding to the fault chain protection devices, so that the whole fault chain protection devices are restored to the initialization state.
Claims (8)
1. The utility model provides a high-power special power supply fault chain protection device based on PLC, characterized by: including main control unit (1) and from controller (7) be connected with main control unit (1), be connected with PLC (2), characterized by from controller (7): a fault input point of the PLC (2) is connected with a fault receiving circuit (3), a reset output point of the PLC (2) is connected with a fault reset circuit (6), the other end of the fault receiving circuit (3) is connected with an external fault transmission optical fiber, a power interface of the fault receiving circuit (3) is connected with a voltage conversion circuit, the voltage conversion circuit is connected with a power indication circuit, and the power indication circuit is connected with a 24V power supply; the fault output point of the PLC (2) is connected with a fault sending circuit (4), the fault sending circuit (4) is connected with an external fault transmission optical fiber, the external fault transmission optical fiber is connected with a next fault receiving circuit (3), and a fault maintaining circuit (5) is connected between the fault receiving circuit (3) and the fault sending circuit (4).
2. The PLC-based high-power special power supply fault interlock protection device is characterized in that: the power supply indicating circuit comprises an eighth resistor (R8) and a light emitting diode (V2) which are connected in series, the eighth resistor (R8) and the first light emitting diode (V2) are connected in series and then respectively connected with a first filter capacitor (C01) and a second filter capacitor (C03) in parallel on the 24V power supply, the eighth resistor (R8) is connected with the positive pole of the 24V power supply, and the first light emitting diode (V2) is connected with the negative pole of the 24V power supply.
3. The PLC-based high-power special power supply fault interlock protection device is characterized in that: the voltage conversion circuit comprises a first resistor (R1) connected with the anode of a 24V power supply, a second resistor (R2) is connected with the first resistor (R1), the cathode of a voltage stabilizing diode (V1) is connected with the second resistor (R2), the anode of the voltage stabilizing diode (V1) is connected with the cathode of the 24V power supply, and a 5V power output end is connected between the second resistor (R2) and the voltage stabilizing diode (V1).
4. The PLC-based high-power special power supply fault interlock protection device according to claim 2 or 3, wherein: the fault receiving circuit (3) comprises a receiving optical fiber head (U1), a VCC terminal of the receiving optical fiber head (U1) is connected with a fifth resistor (R5), the end of the fifth resistor (R5) is also connected with the positive electrode of a 5V power supply, and the other end of the fifth resistor (R5) is connected with an OUT terminal of the receiving optical fiber head (U1); still parallelly connected between VCC terminal and the GND terminal of receiving fiber head (U1) has first electric capacity (C1), still parallelly connected be equipped with first diode (V6), second electric capacity (C2) between OUT terminal and the ground wire of receiving fiber head (U1), and the positive pole ground connection of first diode (V6), the OUT terminal of receiving fiber head (U1) still is connected with the base of a triode (V3), the collector ground connection of a triode (V3), the emitter of a triode (V3) is connected with No. 2 end of opto-coupler (V4), the anodal of 5V power is received after 1 end and the sixth resistance (R6) of opto-coupler (V4) are established ties, the anodal of No. 4 termination 24V power of opto-coupler (V4), the output point of No. 3 end of opto-coupler (V4) is fault signal, connect the fault input point of PLC (2).
5. The PLC-based high-power special power supply fault interlock protection device according to claim 4, wherein: the fault sending circuit (4) comprises a sending optical fiber head (U2), terminals 2,6 and 7 of the sending optical fiber head (U2) are connected with a fourth resistor (R4), the fourth resistor (R4) is connected with a third resistor (R3), the third resistor (R3) is connected with a fault output point of the PLC (2), a terminal 3 of the sending optical fiber head (U2) is connected with an anode of a second light-emitting diode (V7), and a cathode of the second light-emitting diode (V7) is grounded.
6. The PLC-based high-power special power supply fault interlock protection device according to claim 5, wherein: the fault holding circuit (5) comprises a seventh resistor (R7) connected with an OUT terminal of a receiving optical fiber head (U1), the other end of the seventh resistor (R7) is connected with a base electrode of a second triode (V5), an emitting electrode of the second triode (V5) is grounded, and a collecting electrode of the second triode (V5) is connected with the fault resetting circuit (6).
7. The PLC-based high-power special power supply fault interlock protection device according to claim 5, wherein: fault reset circuit (6) are relay (K1), No. 4 ends and No. two triode (V5)'s of relay (K1) collecting electrode are connected, No. 6 ends of relay (K1) still connect between third resistance (R3) and fourth resistance (R4) through the XSI terminal, No. 1 end and the reset output point of PLC (2) of relay (K1) are connected, No. 16 terminal ground connection of relay (K1), the positive pole of 24V power is connected to the normally open contact 13 of relay (K1), the normally open contact 9 and the third resistance (R3) of relay (K1) are connected.
8. The PLC-based high-power special power supply fault interlock protection device is characterized in that: and the PLC (2) is in communication connection with the main controller (1) through the slave controller (7).
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| CN201911025748.6A CN110854801A (en) | 2019-10-25 | 2019-10-25 | High-power special power supply fault interlocking protection device based on PLC |
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| CN201911025748.6A CN110854801A (en) | 2019-10-25 | 2019-10-25 | High-power special power supply fault interlocking protection device based on PLC |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114488925A (en) * | 2021-12-29 | 2022-05-13 | 天水电气传动研究所集团有限公司 | Testing device for PLC (programmable logic controller) function in particle accelerator power supply |
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| CN211266443U (en) * | 2019-10-25 | 2020-08-14 | 天水电气传动研究所集团有限公司 | High-power special power supply fault interlocking protection device based on PLC |
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2019
- 2019-10-25 CN CN201911025748.6A patent/CN110854801A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05122268A (en) * | 1991-10-24 | 1993-05-18 | Nec Ibaraki Ltd | Inter-equipment signal circuit |
| US20060236189A1 (en) * | 2005-04-05 | 2006-10-19 | Jtekt Corporation | Distributed control apparatus |
| KR101125342B1 (en) * | 2011-05-17 | 2012-03-28 | (주) 유식스 | Fiber line monitoring method for ring type network and monitoring device |
| US20140365792A1 (en) * | 2013-06-05 | 2014-12-11 | Samsung Sdi Co., Ltd. | Battery management system, and method of managing the same |
| CN211266443U (en) * | 2019-10-25 | 2020-08-14 | 天水电气传动研究所集团有限公司 | High-power special power supply fault interlocking protection device based on PLC |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114488925A (en) * | 2021-12-29 | 2022-05-13 | 天水电气传动研究所集团有限公司 | Testing device for PLC (programmable logic controller) function in particle accelerator power supply |
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