CN110708051A - Switch control logic circuit - Google Patents
Switch control logic circuit Download PDFInfo
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- CN110708051A CN110708051A CN201910882062.2A CN201910882062A CN110708051A CN 110708051 A CN110708051 A CN 110708051A CN 201910882062 A CN201910882062 A CN 201910882062A CN 110708051 A CN110708051 A CN 110708051A
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/94—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the way in which the control signals are generated
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Abstract
The invention provides a switch control logic circuit, comprising: the relay power supply control module, the relay signal control module, the relay state detection module and the master control CPU are arranged in the relay power supply control module; a power supply terminal for supplying power to the target relay is arranged in the relay power supply control module; the relay signal control module is arranged between the control end of the target relay and the power supply terminal; the main control CPU is respectively connected with the relay power supply control module and the relay signal control module and is used for controlling the working states of the relay power supply control module and the relay signal control module; the relay state detection module is connected between normally open contact control CPUs of the target relay, and the master control CPU acquires state information of the normally open contact through the relay state detection module. The method is favorable for improving the working reliability of the target relay, thereby effectively improving the power supply reliability of the power special transformer user, preventing misoperation caused by power grid interference signals and reducing the loss of the user caused by abnormal power failure.
Description
Technical Field
The invention relates to the technical field of power grids, in particular to a switch control logic circuit.
Background
The special transformer terminal is used for small and medium-sized special transformer users (class B, the power consumption capacity is below 100 kVA) and large special transformer users (class A, the power consumption capacity is above 100 kVA), and the users are large-sized factories or small and medium-sized enterprises generally, have high requirements on power consumption quality, are not allowed to be powered off randomly, and even have very large loss due to power failure in a very short time. In a special transformer terminal product, a relay is basically built in, a common switch control logic circuit is easily interfered, and the relay is not controlled at the moment of electrifying and is easy to malfunction. In addition, the conventional switch logic control circuit has no feedback detection, the state of whether the relay is true or not is changed, and the master control CPU is unclear, so that the use of a user is seriously influenced.
Disclosure of Invention
Based on the technical problems in the background art, the invention provides a switch control logic circuit.
The invention provides a switch control logic circuit, comprising: the relay power supply control module, the relay signal control module, the relay state detection module and the master control CPU are arranged in the relay power supply control module;
a power supply terminal for supplying power to the target relay is arranged in the relay power supply control module; the relay signal control module is arranged between the control end of the target relay and the power supply terminal;
the main control CPU is respectively connected with the relay power supply control module and the relay signal control module and is used for controlling the working states of the relay power supply control module and the relay signal control module;
the relay state detection module is connected between normally open contact control CPUs of the target relay, and the master control CPU acquires state information of the normally open contact through the relay state detection module.
Preferably, the relay power supply control module includes: the circuit comprises a first triode, a second triode, a voltage stabilizing unit, a decoder and a first optocoupler; the first triode is a PNP triode and the second triode is an NPN triode;
the main control CPU is connected with a decoder, the decoder is also connected with the cathode of the light emitting end of the first optocoupler, and the anode of the light emitting end of the first optocoupler is connected with a working power supply; a collector of a light receiving end of the first optocoupler is connected with a power supply, and an emitter of the light receiving end of the first optocoupler is grounded through a twelfth resistor and is connected with a base of the second triode through a voltage stabilizing unit;
the base electrode of the second triode is grounded through an eleventh resistor; the emitter of the second triode is grounded, and the collector of the second triode is grounded through a fourteenth resistor; the emitter of the first triode is connected with a power supply, the collector of the first triode is connected with a power supply terminal, and the base of the first triode is grounded.
Preferably, the relay power supply control module further comprises a first TVS tube; the emitting electrode of the first triode is grounded through a first TVS tube, and the first TVS tube is further connected with a twelfth capacitor and a thirteenth resistor in parallel.
Preferably, the voltage stabilization unit includes: a first diode, a second diode and a tenth resistor; an emitter of a light receiving end of the first optocoupler is connected with the cathode of a second diode, the anode of the second diode is connected with the cathode of a first diode, and the anode of the first diode is connected with a base of a second triode; the tenth resistor is connected in parallel with the second diode.
Preferably, the first diode adopts BZT52B5V1S, and the second diode adopts IN4148 WS.
Preferably, the relay signal control module includes: the target relay, the third triode, the fourth triode, the second optocoupler and the third diode; the third triode is an NPN (negative-positive-negative) tube, and the fourth triode is a PNP (plug-and-play) tube;
the positive electrode of the light emitting end of the second optocoupler is connected with the master control CPU, the negative electrode of the light emitting end of the second optocoupler is grounded, the collector of the light receiving end of the second optocoupler is connected with the power supply terminal through a seventeenth resistor, and the emitter of the light receiving end of the second optocoupler is connected with the base of the third triode; the emitter of the third triode is grounded, and the collector of the third triode is connected with the base of the fourth triode through a fifteenth resistor; the emitter of the fourth triode is connected with the power supply terminal, and the collector of the fourth triode is connected with the control end of the target relay; the anode of the third diode is grounded, and the cathode of the third diode is connected with the collector of the fourth triode; the collector of the fourth triode is also grounded through an eighteenth capacitor.
Preferably, the collector of the light receiving end of the second optocoupler is further grounded through a twentieth capacitor, the emitter of the light receiving end of the second optocoupler is further grounded through a nineteenth capacitor, and the nineteenth capacitor is further connected with a sixteenth resistor in parallel.
Preferably, the relay state detection module includes: the fourth diode, the fourth optocoupler, the seventh triode and the voltage division unit are connected in series;
a common contact of the target relay is connected with the positive electrode of the light emitting end of the fourth optocoupler through the voltage division unit, and a normally open contact of the target relay is connected with the negative electrode of the light emitting end of the fourth optocoupler; a collector of a light receiving end of the fourth optocoupler is connected with a working power supply, and an emitter of the light receiving end of the fourth optocoupler is grounded through a thirtieth resistor and is connected with a base of a seventh triode through a twenty-ninth resistor; the emitter of the seventh triode is grounded, and the collector of the seventh triode is connected with the master control CPU and is connected with the working power supply through the twenty-first resistor;
and the cathode of the sixth diode is connected with the anode of the light emitting end of the fourth optocoupler, and the anode of the sixth diode is connected with the cathode of the light emitting end of the fourth optocoupler.
Preferably, the voltage dividing unit is composed of a power resistor of 51K 1W: the twenty-second resistor, the twenty-third resistor, the twenty-fourth resistor, the twenty-fifth resistor and the twenty-sixth resistor are connected in series.
Preferably, the decoder employs 74HC 138D; the first TVS tube adopts C1332, the third diode adopts M7, the fourth optocoupler adopts LTV-816S-TA1-D3-TX, and the target relay adopts G6RL-14-ASI-12 VDC.
The invention provides a switch control logic circuit which comprises a relay power supply control module, a relay state detection module, a relay signal control module and a main control CPU circuit. When the relay needs to be tripped or closed, the main control CPU firstly detects the current state of the target relay through the relay state detection module, and if the current state is the required state, the main control CPU does not need to send an instruction to change the state of the target relay; if the target relay is not in the required state, the main control CPU firstly sends an instruction to control the relay power supply control module to output the relay control power supply, then the main control CPU sends the instruction again to control the relay signal control module to enable the target relay to trip, meanwhile, the relay state detection module detects whether the target relay is tripped correctly, and if not, the main control CPU needs to re-trip the instruction.
According to the switch control logic circuit provided by the invention, the main control CPU can control the power on and off of the power supply terminal through the relay power supply control module, so that the control power supply of a target relay is controlled; the relay signal control module can realize the issuing of the operation instruction of the main control CPU to the target relay. Therefore, the operation of the main control CPU on the target relay is divided into two steps through the relay power supply control module and the relay signal control module, the working reliability of the target relay is improved, the power supply reliability of a power special transformer user is improved effectively, misoperation caused by power grid interference signals is prevented, and loss caused by abnormal power failure of the user is reduced.
Drawings
FIG. 1 is a schematic diagram of a switch control logic circuit according to the present invention;
FIG. 2 is a circuit diagram of a relay power control module according to the present invention;
FIG. 3 is a circuit diagram of a relay signal control module according to the present invention;
fig. 4 is a circuit diagram of a relay state detection module in the present invention.
Detailed Description
Referring to fig. 1, the present invention provides a switch control logic circuit, including: the relay power supply control module, the relay signal control module, the relay state detection module and the master control CPU.
The relay power supply control module is provided with a power supply terminal VCC12V-YK for supplying power to the target relay K1. The relay signal control module is disposed between the control terminal of the target relay K1 and the power supply terminals VCC 12V-YK.
The main control CPU is respectively connected with the relay power supply control module and the relay signal control module and is used for controlling the working states of the relay power supply control module and the relay signal control module.
The relay state detection module is connected between the normally open contact YK1O control CPUs of the target relay K1, and the master control CPUs acquire the state information of the normally open contact YK1O through the relay state detection module.
In this way, in the present embodiment, the master CPU can obtain the signal of the normally open contact YK1O of the target relay K1 at any time through the relay state detection module, so as to obtain the current state of the target relay K1, so that when the master CPU obtains the operation instruction of the target relay K1, it is determined whether there is an operation demand.
In the embodiment, the main control CPU can control the power on and off of the power supply terminal VCC12V-YK through the relay power supply control module, thereby controlling the control power supply of the target relay K1; the relay signal control module can realize the issuing of the operation instruction of the main control CPU to the target relay K1. Therefore, in the embodiment, the operation of the main control CPU on the target relay K1 is divided into two steps through the relay power supply control module and the relay signal control module, so that the working reliability of the target relay K1 is improved, the misoperation caused by power grid interference signals is prevented, and the loss of a user caused by abnormal power failure is reduced.
In the present embodiment, the target relay K1 is a non-magnetic hold relay G6RL-14-ASI-12VDC, and its pin 1 is grounded, its pin 5 is a control terminal, its pin 2 is a common contact YK1COM, its pin 3 is a normally open contact YK1O, and its pin 4 is a normally closed contact YK 1C.
In this embodiment, the relay power supply control module includes: the circuit comprises a first triode Q1, a second triode Q2, a voltage stabilizing unit, a decoder U1 and a first optocoupler OP 1. The first transistor Q1 is a PNP transistor, and the second transistor Q2 is an NPN transistor.
The master control CPU is connected with a decoder U1, and the decoder U1 is also connected with the cathode of the light emitting end of the first optocoupler OP 1. Specifically, in this embodiment, the decoder U1 employs 74HC138D, pins 1, 2, 4, 5, and 6 thereof are connected to the main control CPU as input control terminals, and a pin 13 output control terminal of the decoder U1 is connected to a cathode of a light emitting terminal of the first optocoupler OP 1. And, pin 16 of the decoder U1 is grounded through a fifth capacitor C5.
The positive electrode of the light emitting end of the first optocoupler OP1 is connected with a working power supply VCC. Thus, the output signal POWER _ C of pin 13 of the decoder U1 determines the voltage difference between the positive and negative electrodes of the light emitting end of the first optocoupler OP1, and when the master CPU controls the decoder U1 to output a low level signal, the first optocoupler OP1 is turned on.
The collector of the light receiving end of the first optical coupler OP1 is connected with the power supply VCCA12V, and the emitter of the light receiving end is grounded through a twelfth resistor R12 and is connected with the base of the second triode Q2 through a voltage stabilizing unit. The base of the second transistor Q2 is also connected to ground through an eleventh resistor R11. The emitter of the second transistor Q2 is grounded, and the collector thereof is grounded through a fourteenth resistor R14. The emitter of the first transistor Q1 is connected to the power supply VCCA12V, its collector is connected to the power supply terminal VCC12V-YK, and its base is grounded.
Therefore, after the first optocoupler OP1 is switched on, the base level of the second triode Q2 can be pulled high, so that the second triode Q2 is switched on, the base level of the first triode Q1 is pulled low, the first triode Q1 is switched on, and the power supply terminal VCC12V-YK is powered from the power supply VCCA 12V. Thus, the external power supply VCCA12V can normally supply power to the target relay K1.
In this embodiment, in order to ensure the working safety of the first optocoupler OP1, a ninth resistor R9 is connected in series between the positive electrode of the light emitting end of the first optocoupler OP1 and the working power VCC for voltage division.
In this embodiment, the voltage stabilization unit includes: a first diode D1, a second diode D2, and a tenth resistor R10. An emitter of a light receiving end of the first optical coupler OP1 is connected with a cathode of the second diode D2, an anode of the second diode D2 is connected with a cathode of the first diode D1, and an anode of the first diode D1 is connected with a base of the second triode Q2. The tenth resistor R10 is connected in parallel with the second diode D2. Specifically, the first diode D1 employs BZT52B5V1S, and the second diode D2 employs IN4148 WS. The setting of constant voltage power supply has further guaranteed the reliable and stable of the signal of telecommunication among the relay power control module, is favorable to improving the interference killing feature of the signal of telecommunication among the circuit.
In this embodiment, the relay power control module further includes a TVS 1. The emitter of the first transistor Q1 is grounded through the first TVS transistor TVS1, and the first TVS transistor TVS1 is further connected in parallel with a twelfth capacitor C12 and a thirteenth resistor R13. Through the arrangement of the first TVS transistor TVS1, the twelfth capacitor C12 and the thirteenth resistor R13, the stable power supply of the power supply VCCA12V is ensured.
The first TVS tube TVS1 employs C1332. In this embodiment, the relay signal control module includes: the target relay K1, third triode Q3, fourth triode Q4, second opto-coupler OP2 and third diode D3. The third tertiary tube Q3 is an NPN tube, and specifically adopts M7; the fourth triode Q4 is a PNP tube.
The positive electrode of the light emitting end of the second optical coupler OP2 is connected with the main control CPU, the negative electrode of the light emitting end is grounded, the collector of the light receiving end is connected with the power supply terminal VCC12V-YK through a seventeenth resistor R17, and the emitter of the light receiving end is connected with the base of a third triode Q3. When a signal YK1 sent by the main control CPU to the second optical coupler OP2 is in a high level, the second optical coupler OP2 is conducted; on the contrary, when the signal YK1 is at a low level, the second optocoupler OP2 is turned off.
The emitter of the third triode Q3 is grounded, and the collector of the third triode Q3 is connected with the base of the fourth triode Q4 through a fifteenth resistor R15. The emitter of the fourth triode Q4 is connected with the power supply terminal VCC12V-YK, and the collector thereof is connected with the control terminal of the target relay K1. The anode of the third diode D3 is grounded, and the cathode thereof is connected to the collector of the fourth triode Q4. The collector of the fourth triode Q4 is also connected to ground through an eighteenth capacitor C18.
Thus, when the second optocoupler OP2 is switched on, the third triode Q3 is switched on, the fourth triode Q4 is switched on, the control end of the target relay K1 is switched on with the power supply terminal VCC12V-YK, so that the normally open contact YK1O of the target relay K1 is switched on with the common contact YK1COM, that is, the target relay K1 trips; when the second optocoupler OP2 is turned off, the third triode Q3 is turned on and the fourth triode Q4, and the normally closed contact YK1C of the target relay K1 is closed with the common contact YK1COM, that is, the target relay K1 is turned on.
Specifically, in this embodiment, the positive electrode of the light emitting end of the second optocoupler OP2 is connected to the main control CPU through an eighteenth resistor R18.
In this embodiment, a light receiving end collector of the second optical coupler OP2 is further grounded through a twentieth capacitor C20, a light receiving end emitter thereof is further grounded through a nineteenth capacitor C19, and a sixteenth resistor R16 is further connected in parallel to the nineteenth capacitor C19. The twentieth capacitor C20, the nineteenth capacitor C19 and the sixteenth resistor R16 are beneficial to improving the stability and reliability of the circuit operation.
In this embodiment, the relay state detection module includes: the voltage divider comprises a sixth diode D6, a fourth optical coupler OP4, a seventh triode Q7 and a voltage dividing unit.
The common contact YK1COM of the target relay K1 is connected with the positive electrode of the light emitting end of the fourth optical coupler OP4 through a voltage dividing unit, and the normally open contact YK1O of the target relay is connected with the negative electrode of the light emitting end of the fourth optical coupler OP 4. The collector of the light receiving end of the fourth optical coupler OP4 is connected to the working power VCC, and the emitter of the light receiving end is grounded through a thirtieth resistor R30 and connected to the base of the seventh triode Q7 through a twenty-ninth resistor R29. The emitter of the seventh triode Q7 is grounded, and the collector thereof is connected with the main control CPU and connected with the working power supply through the twenty-first resistor R21. The sixth diode D6 is a protection device for preventing the reverse connection of the power supply, and has a cathode connected to the anode of the light emitting end of the fourth optocoupler OP4 and an anode connected to the cathode of the light emitting end of the fourth optocoupler OP 4.
In this embodiment, when the target relay K1 is in a conducting state, there is no voltage between the common contact YK1COM and the normally open contact YK1O, the fourth optocoupler OP4 is cut off, and the seventh triode Q7 is cut off, so that the signal XK1 obtained by the main control CPU from the collector of the seventh triode Q7 is at a high level, and the main control CPU determines that the target relay is in a non-tripping state; when the target relay trips, voltage exists between the common contact YK1COM and the normally open contact YK1O, the fourth optocoupler OP4 is conducted, the seventh triode Q7 is conducted, and the signal XK1 is at a low level, the master control CPU judges that the target relay trips.
In the present embodiment, the voltage dividing means is composed of a power resistor of 51K 1W: a twenty-second resistor R22, a twenty-third resistor R23, a twenty-fourth resistor R24, a twenty-fifth resistor R25 and a twenty-sixth resistor R26 which are connected in series.
In the embodiment, the first optical coupler OP1, the second optical coupler OP2 and the fourth optical coupler OP4 are all LTV-816S-TA 1-D3-TX.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention are equivalent to or changed within the technical scope of the present invention.
Claims (10)
1. A switch control logic circuit, comprising: the relay power supply control module, the relay signal control module, the relay state detection module and the master control CPU are arranged in the relay power supply control module;
the relay power supply control module is provided with a power supply terminal (VCC12V-YK) for supplying power to a target relay (K1); the relay signal control module is arranged between the control end of the target relay (K1) and the power supply terminal (VCC 12V-YK);
the main control CPU is respectively connected with the relay power supply control module and the relay signal control module and is used for controlling the working states of the relay power supply control module and the relay signal control module;
the relay state detection module is connected between the normally open contacts (YK1O) of the target relay (K1) and the control CPU, and the master control CPU obtains the state information of the normally open contacts (YK1O) through the relay state detection module.
2. The switch control logic circuit of claim 1, wherein the relay power control module comprises: the circuit comprises a first triode (Q1), a second triode (Q2), a voltage stabilizing unit, a decoder (U1) and a first optical coupler (OP 1); the first triode (Q1) is a PNP triode, and the second triode (Q2) is an NPN triode;
the main control CPU is connected with a decoder (U1), the decoder (U1) is also connected with the cathode of the light emitting end of the first optocoupler (OP1), and the anode of the light emitting end of the first optocoupler (OP1) is connected with a working power supply (VCC); a collector of a light receiving end of the first optical coupler (OP1) is connected with a power supply (VCCA12V), and an emitter of the light receiving end is grounded through a twelfth resistor (R12) and is connected with a base of a second triode (Q2) through a voltage stabilizing unit;
the base of the second triode (Q2) is also grounded through an eleventh resistor (R11); the emitter of the second triode (Q2) is grounded, and the collector of the second triode is grounded through a fourteenth resistor (R14); the emitter of the first triode (Q1) is connected with a power supply (VCCA12V), the collector thereof is connected with a power supply terminal (VCC12V-YK), and the base thereof is grounded.
3. The switch control logic circuit of claim 2, wherein the relay power supply control module further comprises a first TVS transistor (TVS 1); the emitter of the first triode (Q1) is grounded through a first TVS tube (TVS1), and a twelfth capacitor (C12) and a thirteenth resistor (R13) are also connected in parallel with the first TVS tube (TVS 1).
4. The switch control logic circuit of claim 2, wherein the voltage regulation unit comprises: a first diode (D1), a second diode (D2), and a tenth resistor (R10); an emitter of a light receiving end of the first optical coupler (OP1) is connected with a cathode of the second diode (D2), an anode of the second diode (D2) is connected with a cathode of the first diode (D1), and an anode of the first diode (D1) is connected with a base of the second triode (Q2); a tenth resistor (R10) is connected in parallel with the second diode (D2).
5. The switch control logic circuit according to claim 4, characterized IN that the first diode (D1) is BZT52B5V1S, and the second diode (D2) is IN4148 WS.
6. The switch control logic circuit of claim 2, wherein the relay signal control module comprises: the target relay (K1), the third triode (Q3), the fourth triode (Q4), the second optical coupler (OP2) and the third diode (D3); the third triode (Q3) is an NPN tube, and the fourth triode (Q4) is a PNP tube;
the positive electrode of the light emitting end of the second optical coupler (OP2) is connected with the main control CPU, the negative electrode of the light emitting end is grounded, the collector of the light receiving end is connected with a power supply terminal (VCC12V-YK) through a seventeenth resistor (R17), and the emitter of the light receiving end is connected with the base of a third triode (Q3); the emitter of the third triode (Q3) is grounded, and the collector of the third triode is connected with the base of the fourth triode (Q4) through a fifteenth resistor (R15); the emitter of the fourth triode (Q4) is connected with a power supply terminal (VCC12V-YK), and the collector of the fourth triode is connected with the control end of the target relay (K1); the anode of the third diode (D3) is grounded, and the cathode of the third diode is connected with the collector of the fourth triode (Q4); the collector of the fourth triode (Q4) is also connected to ground through an eighteenth capacitor (C18).
7. The switch control logic circuit according to claim 6, characterized in that the light receiving end collector of the second optical coupler (OP2) is further grounded through a twentieth capacitor (C20), the light receiving end emitter thereof is further grounded through a nineteenth capacitor (C19), and the nineteenth capacitor (C19) is further connected in parallel with a sixteenth resistor (R16).
8. The switch control logic circuit of claim 6, wherein the relay state detection module comprises: a sixth diode (D6), a fourth optical coupler (OP4), a seventh triode (Q7) and a voltage division unit;
a common contact (YK1COM) of the target relay (K1) is connected with the positive electrode of the light emitting end of the fourth optical coupler (OP4) through a voltage dividing unit, and a normally open contact (YK1O) of the target relay is connected with the negative electrode of the light emitting end of the fourth optical coupler (OP 4); a collector of a light receiving end of the fourth optical coupler (OP4) is connected with a working power supply (VCC), and an emitter of the light receiving end of the fourth optical coupler is grounded through a thirtieth resistor (R30) and is connected with a base of a seventh triode (Q7) through a twenty-ninth resistor (R29); the emitter of the seventh triode (Q7) is grounded, and the collector of the seventh triode is connected with the master control CPU and is connected with the working power supply through a twenty-first resistor (R21);
the cathode of the sixth diode (D6) is connected with the anode of the light emitting end of the fourth optical coupler (OP4), and the anode of the sixth diode is connected with the cathode of the light emitting end of the fourth optical coupler (OP 4).
9. The switch control logic circuit of claim 8, wherein the voltage divider unit is comprised of a power resistor of 51K 1W: the circuit comprises a twenty-second resistor (R22), a twenty-third resistor (R23), a twenty-fourth resistor (R24), a twenty-fifth resistor (R25) and a twenty-sixth resistor (R26) which are connected in series.
10. The switch control logic circuit according to claim 9, wherein the decoder (U1) employs a 74HC 138D; c1332 is adopted in the first TVS (TVS1), M7 is adopted in the third diode (D3), LTV-816S-TA1-D3-TX is adopted in the fourth optocoupler (OP4), and G6RL-14-ASI-12VDC is adopted in the target relay (K1).
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113740724A (en) * | 2021-08-26 | 2021-12-03 | 福建星云电子股份有限公司 | Relay parallel state switch reliability detection system and method |
| CN115407193A (en) * | 2022-11-01 | 2022-11-29 | 安徽南瑞中天电力电子有限公司 | Terminal detection circuit and method for judging whether power grid system is connected with breaker or not |
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| CN103325620A (en) * | 2013-06-08 | 2013-09-25 | 南京新联电子股份有限公司 | Relay malfunction preventing control circuit used for electricity information collecting terminal |
| CN103439649A (en) * | 2013-06-28 | 2013-12-11 | 江苏林洋电子股份有限公司 | Monitoring system for having control over connection state of switch of loop |
| CN203931159U (en) * | 2014-07-02 | 2014-11-05 | 南京志达电力科技有限责任公司 | Power information collecting device Remote Control Interface broken wire detection system |
| CN109254245A (en) * | 2018-11-07 | 2019-01-22 | 紫光测控有限公司 | A kind of short circuit of relay circuit and open detection circuit |
| CN110246322A (en) * | 2019-05-21 | 2019-09-17 | 安徽南瑞中天电力电子有限公司 | A kind of MBUS water meter collection copies switching circuit |
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| CN113740724A (en) * | 2021-08-26 | 2021-12-03 | 福建星云电子股份有限公司 | Relay parallel state switch reliability detection system and method |
| CN115407193A (en) * | 2022-11-01 | 2022-11-29 | 安徽南瑞中天电力电子有限公司 | Terminal detection circuit and method for judging whether power grid system is connected with breaker or not |
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Application publication date: 20200117 |