A magnetic latching relay drive control system for a commutating switch

Abstract

The application relates to a magnetic holding relay driving control system applied to a commutating switch, which comprises a control device, a driving power switch device, a switching driving device and a series three-phase double-coil magnetic holding relay; the control device is electrically connected with the driving power switch device and the switching driving device respectively, the driving power switch device is electrically connected with the switching driving device, and the switching driving device is electrically connected with the series three-phase double-coil magnetic holding relay. The application realizes the function of the commutating switch based on the series three-phase double-coil magnetic holding relay, has high reliability, can effectively eliminate the phase-to-phase short circuit problem caused by abnormal driving signals, simultaneously reduces the load power-off phenomenon caused by the open circuit of the relay, and meets the technical requirement of the commutating switch.

Description

Technical Field

[0001] This invention relates to the field of products supporting phase switches, and more particularly to a magnetic latching relay drive control system applied to phase switches. Background Technology

[0002] In power systems, phase-changing switches are crucial devices for regulating three-phase imbalance. A phase-changing switch can switch the load phase L to any one of the three phases (A, B, C), with the three-phase magnetic latching relay being a key component. The reliability of this device depends not only on the quality of the relay itself but also on the reliability of the relay drive control circuit.

[0003] Most commonly used three-phase magnetic latching relays in existing technology are single-pole single-throw type parallel connections, and their structure is as follows: Figure 1 As shown. In Figure 1 In the diagram, the three dashed boxes represent three double-coil single-pole single-throw magnetic latching relays. The CON terminals of these three relays are connected in parallel, and their internal structures are identical. Therefore, we will use the uppermost A-phase relay as an example for explanation:

[0004] The dashed lines on the left, labeled "Open" and "Close," represent the opening and closing drive coils, respectively. On the right, CON is the moving contact of the relay, NO is the stationary contact, and o is the empty contact. When a positive DC voltage signal is applied to the opening drive coil, the moving contact moves towards the empty contact, meaning CON is open and floating. When a positive DC voltage signal is applied to the closing drive coil, the moving contact moves towards the stationary contact NO, which is connected to the A-phase incoming line. Similarly, the B-phase relay in the middle can be connected to the B-phase incoming line, and the C-phase relay below can be connected to the C-phase incoming line.

[0005] The magnetic latching relay with the above structure is called a parallel three-phase magnetic latching relay. When this type of magnetic latching relay is applied to a phase-changing switch, if the relay drive control circuit fails or the software control logic is abnormal, phase-to-phase short circuits or load open circuits are very likely to occur. The drive control circuit has poor reliability and cannot meet the technical requirements of the phase-changing switch during use, which is not conducive to the production safety of the power system. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to address the shortcomings of the prior art by providing a magnetic latching relay drive control system for phase switching, which has high reliability, can effectively prevent phase-to-phase short circuits caused by abnormal drive signals, and reduces load loss caused by relay open circuits, thus meeting the technical requirements of phase switching.

[0007] The technical solution of the present invention to solve the above-mentioned technical problems is as follows:

[0008] A magnetic latching relay drive control system for phase switching includes a control device, a drive power switch device, a switching drive device, and a series-connected three-phase dual-coil magnetic latching relay.

[0009] The control device is electrically connected to the drive power switch and the circuit breaker opening and closing drive, respectively. The drive power switch is electrically connected to the circuit breaker opening and closing drive, and the circuit breaker opening and closing drive is electrically connected to the series-connected three-phase dual-coil magnetic latching relay.

[0010] Based on the above technical solution, the present invention has the following improvements:

[0011] Further: The series-connected three-phase dual-coil magnetic latching relay includes a phase A single-pole double-throw relay, a phase B single-pole double-throw relay, and a phase C single-pole double-throw relay;

[0012] The A-phase single-pole double-throw relay, the B-phase single-pole double-throw relay, and the C-phase single-pole double-throw relay all include a tripping coil, a closing coil, a moving contact, a first stationary contact, and a second stationary contact;

[0013] The opening coil, closing coil, opening coil, closing coil, opening coil, closing coil, opening coil, and closing coil of the A-phase single-pole double-throw relay, as well as the C-phase single-pole double-throw relay, are all electrically connected to the opening and closing drive device.

[0014] The first stationary contact of the A-phase single-pole double-throw relay is suspended. The second stationary contact of the A-phase single-pole double-throw relay is electrically connected to the A-phase of the three-phase power supply. The moving contact of the A-phase single-pole double-throw relay is electrically connected to the first stationary contact of the B-phase single-pole double-throw relay. The second stationary contact of the B-phase single-pole double-throw relay is electrically connected to the B-phase of the three-phase power supply. The moving contact of the B-phase single-pole double-throw relay is electrically connected to the first stationary contact of the C-phase single-pole double-throw relay. The second stationary contact of the C-phase single-pole double-throw relay is electrically connected to the C-phase of the three-phase power supply. The moving contact of the C-phase single-pole double-throw relay is electrically connected to the load.

[0015] Further: The drive power switch device includes a switch control circuit and a boost circuit. The control device is electrically connected to the boost circuit through the switch control circuit, and the boost circuit is electrically connected to the opening and closing drive device.

[0016] Furthermore: the switch control circuit includes a PMOS transistor Q1, a transistor Q2, resistors R6, R7, R11, and R12;

[0017] The gate of PMOS transistor Q1 is electrically connected to the collector of transistor Q2 through resistor R7. The source of PMOS transistor Q1 is electrically connected to the 24V power supply terminal. One end of resistor R6 is connected to the common terminal between the source of PMOS transistor Q1 and the 24V power supply terminal, and the other end of resistor R6 is connected to the common terminal between the gate of PMOS transistor Q1 and resistor R7. The drain of PMOS transistor Q1 is electrically connected to the boost circuit. The base of transistor Q2 is electrically connected to the control device through resistor R10. The emitter of transistor Q2 is grounded. One end of resistor R12 is connected to the common terminal between resistor R10 and the control device, and the other end of resistor R12 is grounded.

[0018] Further: The boost circuit includes a voltage regulator chip U1, capacitors CD1, CD2, CD3, C1, C2, C3, inductor L1, resistors R4, R8, R9, and Schottky diode D3;

[0019] The first ground pin GND1 and the second ground pin GND2 of the voltage regulator chip U1 are both grounded. The voltage input pin VIN of the voltage regulator chip U1 is electrically connected to the drain of the PMOS transistor Q1. The voltage input pin VIN of the voltage regulator chip U1 is also grounded through the capacitor C2. One end of the capacitor CD1 is electrically connected to the drain of the PMOS transistor Q1, and the other end of the capacitor CD1 is grounded. The phase compensation pin COMP of the voltage regulator chip U1 is grounded through the resistor R8 and the capacitor C3 in sequence.

[0020] One end of the inductor L1 is electrically connected to the voltage input pin VIN of the voltage regulator chip U1, and the other end of the inductor L1 is electrically connected to the switching pin SW of the voltage regulator chip U1. The switching pin SW of the voltage regulator chip U1 is also electrically connected to the circuit breaker drive device through the Schottky diode D3. One end of the resistor R4 is connected to the common terminal between the Schottky diode D3 and the circuit breaker drive device, and the other end of the resistor R4 is grounded through the resistor R9. The feedback pin FB of the voltage regulator chip U1 is connected to the common terminal of the resistors R4 and R9.

[0021] One end of capacitor CD2, one end of capacitor CD3, and one end of capacitor C1 are all connected to the common terminal between the Schottky diode D3 and the opening and closing drive device, and the other ends of capacitor CD2, capacitor CD3, and capacitor C1 are all grounded.

[0022] Further: The circuit breaker opening and closing drive device includes an A-phase relay opening and closing drive circuit, a B-phase relay opening and closing drive circuit, and a C-phase relay opening and closing drive circuit.

[0023] The control device is electrically connected to the closing drive signal interlock circuit and the opening drive signal interlock circuit, respectively. The closing drive signal interlock circuit is electrically connected to the A-phase relay opening and closing drive circuit, the B-phase relay opening and closing drive circuit, and the C-phase relay opening and closing drive circuit, respectively. The opening drive signal interlock circuit is electrically connected to the A-phase relay opening and closing drive circuit, the B-phase relay opening and closing drive circuit, and the C-phase relay opening and closing drive circuit, respectively. The A-phase relay opening and closing drive circuit is electrically connected to the boost circuit, the opening coil of the A-phase single-pole double-throw relay, and the closing coil of the A-phase single-pole double-throw relay, respectively. The B-phase relay opening and closing drive circuit is electrically connected to the boost circuit, the opening coil of the B-phase single-pole double-throw relay, and the closing coil of the B-phase single-pole double-throw relay, respectively. The C-phase relay opening and closing drive circuit is electrically connected to the boost circuit, the opening coil of the C-phase single-pole double-throw relay, and the closing coil of the C-phase single-pole double-throw relay, respectively.

[0024] Furthermore: the closing drive signal interlock circuit and the opening drive signal interlock circuit have the same first circuit structure;

[0025] The first circuit structure includes a 74HC138 decoder; all three signal input pins of the decoder are electrically connected to the control device, the first signal output pin of the decoder is electrically connected to the A-phase relay opening and closing drive circuit, the second signal output pin of the decoder is electrically connected to the B-phase relay opening and closing drive circuit, and the third signal output pin of the decoder is electrically connected to the C-phase relay opening and closing drive circuit.

[0026] Furthermore, the A-phase relay opening and closing drive circuit, the B-phase relay opening and closing drive circuit, and the C-phase relay opening and closing drive circuit all have the same second circuit structure;

[0027] The second circuit structure includes NMOS transistor Q6, NMOS transistor Q10, transistor Q8, transistor Q12, resistors R137, R139, R140, R143, R145, R149, R150, R155, diode D15, diode D17, and a 5-pin connector CN13;

[0028] One end of resistor R139 is electrically connected to the base of transistor Q8, and the other end of resistor R139 is electrically connected to the 3.3V power supply terminal through resistor R143. The emitter of transistor Q8 is grounded, and the collector of transistor Q8 is electrically connected to the gate of NMOS transistor Q6. The gate of NMOS transistor Q6 is also grounded through resistor R137. One end of resistor R140 is connected to the common terminal of the gate of NMOS transistor Q6 and resistor R137, and the other end of resistor R140 is electrically connected to the boost circuit. The source of NMOS transistor Q6 is grounded. The drain of NMOS transistor Q6 is electrically connected to pin 1 of connector CN13, and the drain of NMOS transistor Q6 is also electrically connected to pin 2 of connector CN13 through diode D15. Pin 2 of connector CN13 is also electrically connected to the boost circuit, and pin 4 of connector CN13 is grounded.

[0029] One end of resistor R149 is electrically connected to the base of transistor Q12, and the other end of resistor R149 is electrically connected to the 3.3V power supply terminal through resistor R155. The emitter of transistor Q12 is grounded, and the collector of transistor Q12 is electrically connected to the gate of NMOS transistor Q10. The gate of NMOS transistor Q10 is also connected to the common terminal of the boost device and resistor R140 through resistor R145. One end of resistor R150 is connected to the common terminal of the gate of NMOS transistor Q10 and resistor R145, and the other end of resistor R150 is grounded. The source of NMOS transistor Q10 is grounded. The drain of NMOS transistor Q10 is electrically connected to pin 3 of connector CN13, and the drain of NMOS transistor Q10 is also electrically connected to pin 2 of connector CN13 through diode D17.

[0030] In the A-phase relay opening and closing drive circuit, the other end of resistor R139 is electrically connected to the first signal output pin of the decoder in the closing drive signal interlock circuit, and the other end of resistor R149 is electrically connected to the first signal output pin of the decoder in the opening drive signal interlock circuit; pin 1 of connector CN13 is also electrically connected to the closing coil of the A-phase single-pole double-throw relay, and pin 3 of connector CN13 is also electrically connected to the opening coil of the A-phase single-pole double-throw relay.

[0031] In the B-phase relay opening and closing drive circuit, the other end of resistor R139 is electrically connected to the second signal output pin of the decoder in the closing drive signal interlock circuit, and the other end of resistor R149 is electrically connected to the second signal output pin of the decoder in the opening drive signal interlock circuit; pin 1 of connector CN13 is also electrically connected to the closing coil of the B-phase single-pole double-throw relay, and pin 3 of connector CN13 is also electrically connected to the opening coil of the B-phase single-pole double-throw relay.

[0032] In the C-phase relay opening and closing drive circuit, the other end of resistor R139 is electrically connected to the third signal output pin of the decoder in the closing drive signal interlock circuit, and the other end of resistor R149 is electrically connected to the third signal output pin of the decoder in the opening drive signal interlock circuit; pin 1 of connector CN13 is also electrically connected to the closing coil of the C-phase single-pole double-throw relay, and pin 3 of connector CN13 is also electrically connected to the opening coil of the C-phase single-pole double-throw relay.

[0033] Furthermore, the circuit breaker drive device also includes an A-phase circuit breaker status feedback circuit, a B-phase circuit breaker status feedback circuit, and a C-phase circuit breaker status feedback circuit.

[0034] The A-phase opening and closing status feedback circuit is electrically connected to the control device and the A-phase single-pole double-throw relay, respectively. The B-phase opening and closing status feedback circuit is electrically connected to the control device and the B-phase single-pole double-throw relay, respectively. The C-phase opening and closing status feedback circuit is electrically connected to the control device and the C-phase single-pole double-throw relay, respectively.

[0035] Furthermore: the A-phase opening and closing status feedback circuit, the B-phase opening and closing status feedback circuit, and the C-phase opening and closing status feedback circuit all have the same third circuit structure;

[0036] The third circuit structure includes a transistor Q14, resistors R147, R151, R157, and capacitor C62. The emitter of transistor Q14 is grounded, the collector of transistor Q14 is electrically connected to the control device, and the collector of transistor Q14 is also electrically connected to a 3.3V power supply terminal through resistor R151. One end of resistor R147 is connected to the common terminal between resistor R151 and the 3.3V power supply terminal. One end of capacitor C62 is connected to the common terminal between the collector of transistor Q14 and the control device, and the other end of capacitor C62 is grounded.

[0037] In the A-phase opening and closing status feedback circuit, the other end of the resistor R147 is electrically connected to pin 5 of the connector in the A-phase relay opening and closing drive circuit, and the base of the transistor Q14 is electrically connected to pin 5 of the connector in the A-phase relay opening and closing drive circuit through the corresponding resistor R157.

[0038] In the B-phase opening and closing status feedback circuit, the other end of the resistor R147 is electrically connected to pin 5 of the connector in the B-phase relay opening and closing drive circuit, and the base of the transistor Q14 is electrically connected to pin 5 of the connector in the B-phase relay opening and closing drive circuit through the corresponding resistor R157.

[0039] In the C-phase opening and closing status feedback circuit, the other end of the resistor R147 is electrically connected to pin 5 of the connector in the C-phase relay opening and closing drive circuit, and the base of the transistor Q14 is electrically connected to pin 5 of the connector in the C-phase relay opening and closing drive circuit through the corresponding resistor R157.

[0040] Further: The control device is specifically an STM32F407VGT6 MCU.

[0041] The beneficial effects of the present invention are as follows: the control device is used to send control commands to the drive power switch device and the opening and closing drive device respectively according to the preset computer program; the drive power switch device is used to control the opening and closing of the opening and closing drive device according to the control commands sent by the control device; the opening and closing drive device is used to control the opening and closing of each relay in the series three-phase double coil magnetic latching relay under the drive of the drive power switch device according to the sent control commands.

[0042] The magnetic latching relay drive control system for phase switching in this invention realizes the function of phase switching based on a series three-phase dual-coil magnetic latching relay. It has high reliability, can effectively prevent phase-to-phase short circuits caused by abnormal drive signals, and reduce load loss caused by relay open circuits, thus meeting the technical requirements of phase switching. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of a traditional parallel three-phase magnetic latching relay.

[0044] Figure 2 This is a schematic diagram of a magnetic latching relay drive control system applied to a commutation switch according to an embodiment of the present invention;

[0045] Figure 3-1 , Figure 3-2 and Figure 3-3 All of these are circuit design diagrams of the MCU in the embodiments of the present invention;

[0046] Figure 4 This is a circuit design diagram of the switch control circuit and the boost circuit in an embodiment of the present invention;

[0047] Figure 5 This is a circuit design diagram of the closing drive signal interlock circuit and the opening drive signal interlock circuit in an embodiment of the present invention;

[0048] Figure 6 The circuit design diagrams for the A-phase relay opening and closing drive circuit, the B-phase relay opening and closing drive circuit, and the C-phase relay opening and closing drive circuit in the embodiments of the present invention are shown.

[0049] Figure 7 This is a schematic diagram of another magnetic latching relay drive control system applied to a commutation switch in an embodiment of the present invention. Detailed Implementation

[0050] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0051] The present invention will now be described with reference to the accompanying drawings.

[0052] Examples, such as Figure 2 As shown, a magnetic latching relay drive control system for a phase-changing switch includes a control device, a drive power switch device, a switching drive device, and a series-connected three-phase dual-coil magnetic latching relay.

[0053] The control device is electrically connected to the drive power switch and the circuit breaker opening and closing drive, respectively. The drive power switch is electrically connected to the circuit breaker opening and closing drive, and the circuit breaker opening and closing drive is electrically connected to the series-connected three-phase dual-coil magnetic latching relay.

[0054] The working principle of the magnetic latching relay drive control system in this embodiment is as follows:

[0055] The control device sends control commands to the drive power switch and the opening / closing drive according to the preset computer program. The drive power switch controls the opening and closing of the opening / closing drive according to the control commands sent by the control device. The opening / closing drive controls the opening and closing of each relay in the series three-phase double-coil magnetic latching relay under the drive of the drive power switch, thereby realizing the phase switching function of the phase switching switch.

[0056] The magnetic latching relay drive control system applied to the phase switching in this embodiment is based on a series three-phase dual-coil magnetic latching relay to realize the function of the phase switching. It has high reliability, can effectively prevent phase-to-phase short circuits caused by abnormal drive signals, and reduce the load loss phenomenon caused by relay open circuit, thus meeting the technical requirements of the phase switching.

[0057] for Figure 1 The traditional parallel three-phase magnetic latching relay shown is Figure 1 From top to bottom, the relays are phase A, phase B, and phase C. Their commutation principle is explained below:

[0058] When the A-phase relay is closed and both the B-phase and C-phase relays are open, the A-phase incoming line supplies power to the load.

[0059] When the B-phase relay is closed and both the A-phase and C-phase relays are open, the B-phase incoming line supplies power to the load.

[0060] When the C-phase relay is closed and both the A-phase and B-phase relays are open, the C-phase incoming line supplies power to the load.

[0061] When switching the incoming line from phase A to phase B during three-phase imbalance mitigation, the phase A relay must be tripped first. Only after successful tripping of phase A should the phase B relay be closed to ensure a stable switching process. Similarly, five other switching methods can be implemented: phase A to phase C, phase B to phase A, phase B to phase C, phase C to phase A, and phase C to phase B.

[0062] Applying a positive DC drive signal to the closing drive coil is represented by 1, and not applying a closing drive signal is represented by 0; applying a positive DC drive signal to the opening drive coil is represented by 1, and not applying a opening drive signal is represented by 0, thus obtaining... Figure 1 The logic table of the drive signals corresponding to the parallel three-phase magnetic latching relay is shown in Table 1.

[0063] Table 1. Logic table of drive signals for parallel three-phase magnetic latching relays

[0064]

[0065] As can be seen from Table 1, when there are two or more 1s in the closing control signal, it will cause a short circuit between the incoming phases; when there are three 1s in the opening control signal, it will cause an open circuit at the load end.

[0066] Specifically, in this embodiment, the control device is an STM32F407VGT6 MCU. For ease of demonstration, this MCU is shown in three sections, with the core chips for each section being U22A, U22B, and U22C, respectively. The circuit design diagrams of the core chips and their peripheral circuits for each section are shown below. Figures 3-1 to 3-2 As shown. This MCU has 1MB of embedded Flash and 192KB of RAM. Figure 3-2 The PD4 pin of the MCU is configured as the control signal pin VCC_RELAY_CTL for driving the power switch device. In addition, pins PE10 to PE12 are configured as the chip input signals CS_1 to CS_3 for the closing control logic in the opening and closing drive device, and pins PE13 to PE15 are configured as the chip input signals CS_4 to CS_6 for the opening control logic in the opening and closing drive device.

[0067] Preferably, such as Figure 2 As shown, the series-connected three-phase dual-coil magnetic latching relay includes a phase A single-pole double-throw relay, a phase B single-pole double-throw relay, and a phase C single-pole double-throw relay;

[0068] The A-phase single-pole double-throw relay, the B-phase single-pole double-throw relay, and the C-phase single-pole double-throw relay all include a tripping coil, a closing coil, a moving contact, a first stationary contact, and a second stationary contact;

[0069] The opening coil, closing coil, opening coil, closing coil, opening coil, closing coil, opening coil, and closing coil of the A-phase single-pole double-throw relay, as well as the C-phase single-pole double-throw relay, are all electrically connected to the opening and closing drive device.

[0070] The first stationary contact of the A-phase single-pole double-throw relay is suspended. The second stationary contact of the A-phase single-pole double-throw relay is electrically connected to the A-phase of the three-phase power supply. The moving contact of the A-phase single-pole double-throw relay is electrically connected to the first stationary contact of the B-phase single-pole double-throw relay. The second stationary contact of the B-phase single-pole double-throw relay is electrically connected to the B-phase of the three-phase power supply. The moving contact of the B-phase single-pole double-throw relay is electrically connected to the first stationary contact of the C-phase single-pole double-throw relay. The second stationary contact of the C-phase single-pole double-throw relay is electrically connected to the C-phase of the three-phase power supply. The moving contact of the C-phase single-pole double-throw relay is electrically connected to the load.

[0071] Figure 1 The parallel three-phase magnetic latching relay shown only allows one closing drive signal; therefore, any signal exceeding one closing signal is considered an abnormal closing drive signal. This embodiment... Figure 2The series-connected three-phase dual-coil magnetic latching relay, under the condition of an abnormal closing drive signal, has the following specific state at the load L end as shown in Table 2: (The moving contact CON reversing to the first stationary contact NO corresponds to opening, and the moving contact CON reversing to the second stationary contact NC corresponds to closing.)

[0072] Table 2. Situations caused by abnormal closing drive signals

[0073]

[0074] Therefore, the series-connected three-phase dual-coil magnetic latching relay of this embodiment will not cause a short circuit at the load end. In addition, the load end will only be open when the A-phase single-pole double-throw relay, the B-phase single-pole double-throw relay and the C-phase single-pole double-throw relay are opened at the same time (that is, all three moving contacts CON are reversed to the corresponding first stationary contact NO). Compared with traditional technology, the probability of load end open circuit is greatly reduced.

[0075] Preferably, such as Figure 2 As shown, the drive power switch device includes a switch control circuit and a boost circuit. The control device is electrically connected to the boost circuit through the switch control circuit, and the boost circuit is electrically connected to the opening and closing drive device.

[0076] The drive power switch device with the above structure facilitates the power switch control of the subsequent opening and closing drive device, and can also provide a suitable drive voltage for the opening and closing drive device, thereby improving the reliability of the series three-phase dual-coil magnetic latching relay.

[0077] Specifically, such as Figure 4 As shown, the switch control circuit includes a PMOS transistor Q1, a transistor Q2, resistors R6, R7, R11, and R12.

[0078] The gate of PMOS transistor Q1 is electrically connected to the collector of transistor Q2 through resistor R7. The source of PMOS transistor Q1 is electrically connected to the 24V power supply terminal. One end of resistor R6 is connected to the common terminal between the source of PMOS transistor Q1 and the 24V power supply terminal, and the other end of resistor R6 is connected to the common terminal between the gate of PMOS transistor Q1 and resistor R7. The drain of PMOS transistor Q1 is electrically connected to the boost circuit. The base of transistor Q2 is electrically connected to the control device through resistor R10. The emitter of transistor Q2 is grounded. One end of resistor R12 is connected to the common terminal between resistor R10 and the control device, and the other end of resistor R12 is grounded.

[0079] The aforementioned switch control circuit is a high-side switch control circuit composed of a PMOS transistor Q1 and an NPN transistor Q2. When the control signal VCC_RELAY_CTL is low or in an open-drain state, the base of transistor Q2 is low due to the pull-down resistor R12, and the transistor is in the off state. Simultaneously, the gate voltage of PMOS transistor Q1 is pulled up by resistor R6, thus the PMOS is also in the off state. When the control signal VCC_RELAY_CTL is high, transistor Q2 is turned on, the gate voltage of the PMOS is pulled low, and PMOS transistor Q1 is turned on. VDD_24V can then provide the input voltage for the subsequent boost circuit.

[0080] Specifically, such as Figure 4 As shown, the boost circuit includes a voltage regulator chip U1, capacitors CD1, CD2, CD3, C1, C2, and C3, an inductor L1, resistors R4, R8, and R9, and a Schottky diode D3.

[0081] The first ground pin GND1 and the second ground pin GND2 of the voltage regulator chip U1 are both grounded. The voltage input pin VIN of the voltage regulator chip U1 is electrically connected to the drain of the PMOS transistor Q1. The voltage input pin VIN of the voltage regulator chip U1 is also grounded through the capacitor C2. One end of the capacitor CD1 is electrically connected to the drain of the PMOS transistor Q1, and the other end of the capacitor CD1 is grounded. The phase compensation pin COMP of the voltage regulator chip U1 is grounded through the resistor R8 and the capacitor C3 in sequence.

[0082] One end of the inductor L1 is electrically connected to the voltage input pin VIN of the voltage regulator chip U1, and the other end of the inductor L1 is electrically connected to the switching pin SW of the voltage regulator chip U1. The switching pin SW of the voltage regulator chip U1 is also electrically connected to the circuit breaker drive device through the Schottky diode D3. One end of the resistor R4 is connected to the common terminal between the Schottky diode D3 and the circuit breaker drive device, and the other end of the resistor R4 is grounded through the resistor R9. The feedback pin FB of the voltage regulator chip U1 is connected to the common terminal of the resistors R4 and R9.

[0083] One end of capacitor CD2, one end of capacitor CD3, and one end of capacitor C1 are all connected to the common terminal between the Schottky diode D3 and the opening and closing drive device, and the other ends of capacitor CD2, capacitor CD3, and capacitor C1 are all grounded.

[0084] Specifically, in this embodiment, the voltage regulator chip U1 is model LM2577S.

[0085] The aforementioned boost circuit is a pulse-width modulation (PWM) boost circuit composed of an LM2577S voltage regulator chip U1. Electrolytic capacitor CD1 and ceramic capacitor C2 filter the input signal; resistors R8 and C3 form a zero-pole compensation network to provide a stable 52kHz switching frequency; power inductor L1 stores energy, providing energy to the load when the internal switch is open and supplying it through a loop formed by Schottky diode D3 when the internal switch is closed; resistors R4 and R9 provide negative voltage feedback to ensure stable output voltage; capacitors CD2, CD3, and C1 filter the output voltage; and the current acquisition and comparator inside the LM2577S chip also provide overload protection for the output power supply.

[0086] This embodiment is illustrated by... Figure 4 The switch control circuit and boost circuit shown can better control the power switch of the opening and closing drive device and realize overload protection of the output power supply, further improving the reliability of the entire drive control system.

[0087] Preferably, such as Figure 2 As shown, the circuit breaker opening and closing drive device includes a closing drive signal interlock circuit, a closing drive signal interlock circuit, an A-phase relay opening and closing drive circuit, a B-phase relay opening and closing drive circuit, and a C-phase relay opening and closing drive circuit.

[0088] The control device is electrically connected to the closing drive signal interlock circuit and the opening drive signal interlock circuit, respectively. The closing drive signal interlock circuit is electrically connected to the A-phase relay opening and closing drive circuit, the B-phase relay opening and closing drive circuit, and the C-phase relay opening and closing drive circuit, respectively. The opening drive signal interlock circuit is electrically connected to the A-phase relay opening and closing drive circuit, the B-phase relay opening and closing drive circuit, and the C-phase relay opening and closing drive circuit, respectively. The A-phase relay opening and closing drive circuit is electrically connected to the boost circuit, the opening coil of the A-phase single-pole double-throw relay, and the closing coil of the A-phase single-pole double-throw relay, respectively. The B-phase relay opening and closing drive circuit is electrically connected to the boost circuit, the opening coil of the B-phase single-pole double-throw relay, and the closing coil of the B-phase single-pole double-throw relay, respectively. The C-phase relay opening and closing drive circuit is electrically connected to the boost circuit, the opening coil of the C-phase single-pole double-throw relay, and the closing coil of the C-phase single-pole double-throw relay, respectively.

[0089] By using the interlocking circuits for the closing drive signal and the opening drive signal, combined with the corresponding opening and closing drive circuits for each single-pole double-throw relay (i.e., the opening and closing drive circuits for phase A, phase B, and phase C relays), the interlocking function between the three-phase single-pole double-throw relays can be achieved, effectively preventing the load-side open circuit problem caused by the simultaneous driving of three three-phase single-pole double-throw relays. Furthermore, it effectively improves the output load-carrying capacity, facilitating the closing drive of the subsequent three three-phase single-pole double-throw relays. Simultaneously, the combination of the opening and closing drive device constructed by the above structure with the series-connected three-phase dual-coil magnetic latching relay can effectively solve the load-side short circuit problem caused by abnormal control signals.

[0090] Specifically, such as Figure 5 As shown, the closing drive signal interlock circuit and the opening drive signal interlock circuit have the same first circuit structure;

[0091] The first circuit structure includes a 74HC138 decoder; all three signal input pins of the decoder are electrically connected to the control device, the first signal output pin of the decoder is electrically connected to the A-phase relay opening and closing drive circuit, the second signal output pin of the decoder is electrically connected to the B-phase relay opening and closing drive circuit, and the third signal output pin of the decoder is electrically connected to the C-phase relay opening and closing drive circuit.

[0092] Since the closing drive signal interlock circuit and the opening drive signal interlock circuit have the same first circuit structure, this embodiment will use the closing drive signal interlock circuit as an example for explanation. Figure 5 Specifically, the interlock circuit for the closing drive signal is similar, and the interlock circuit for the opening drive signal is similar. Figure 5 In the circuit, the closing drive signal interlocking circuit is mainly composed of a 74HC138 decoder. It provides a default high level for the input signals CS_1, CS_2, and CS_3 through three pull-up resistors R119, R120, and R121. KA_ON is the closing control signal for the A-phase single-pole double-throw relay, KB_ON is the closing control signal for the B-phase single-pole double-throw relay, and KC_ON is the closing control signal for the C-phase single-pole double-throw relay. The logic relationship of this decoder is shown in Table 3 below. Figure 5 Other unused signals Y0 to Y2, Y4, and Y7 are connected to GND through pull-down resistors R125, R126, R128, R131, and R134 to improve the decoder's anti-interference capability.

[0093] Table 3. Logic Relationship Table for 74HC138 Decoder

[0094]

[0095] The driving logic relationship of the closing drive signal interlock circuit can be obtained from Table 3 as shown in Table 4 (1 represents high level, 0 represents low level).

[0096] Table 4. Drive logic relationship of the interlock circuit for closing drive signal

[0097] CS_1 CS_2 CS_3 KA_ON KB_ON KC_ON illustrate 1 1 0 0 1 1 Phase A closing 1 0 1 1 0 1 Phase B closing 0 1 1 1 1 0 C phase closing

[0098] The circuit structure and principle of the tripping drive signal interlock circuit are the same as those of the closing drive signal interlock circuit, and specific details will not be repeated here. The input signals of the tripping drive signal interlock circuit are represented by CS_4 to CS_6, respectively. The tripping control signals of the A-phase single-pole double-throw relay, the B-phase single-pole double-throw relay, and the C-phase single-pole double-throw relay are represented by KA_OFF, KB_OFF, and KC_OFF, respectively. The driving logic relationship of the tripping drive signal interlock circuit is shown in Table 5 (1 represents high level, 0 represents low level).

[0099] Table 5. Drive logic relationship of the tripping drive signal interlock circuit.

[0100] CS_6 CS_5 CS_4 KA_OFF KB_OFF KC_OFF illustrate 1 1 0 0 1 1 Phase A tripped 1 0 1 1 0 1 Phase B tripping 0 1 1 1 1 0 C-phase tripping

[0101] Preferably, such as Figure 6 As shown, the A-phase relay opening and closing drive circuit, the B-phase relay opening and closing drive circuit, and the C-phase relay opening and closing drive circuit all have the same second circuit structure.

[0102] The second circuit structure includes NMOS transistor Q6, NMOS transistor Q10, transistor Q8, transistor Q12, resistors R137, R139, R140, R143, R145, R149, R150, R155, diode D15, diode D17, and a 5-pin connector CN13;

[0103] One end of resistor R139 is electrically connected to the base of transistor Q8, and the other end of resistor R139 is electrically connected to the 3.3V power supply terminal through resistor R143. The emitter of transistor Q8 is grounded, and the collector of transistor Q8 is electrically connected to the gate of NMOS transistor Q6. The gate of NMOS transistor Q6 is also grounded through resistor R137. One end of resistor R140 is connected to the common terminal of the gate of NMOS transistor Q6 and resistor R137, and the other end of resistor R140 is electrically connected to the boost circuit. The source of NMOS transistor Q6 is grounded. The drain of NMOS transistor Q6 is electrically connected to pin 1 of connector CN13, and the drain of NMOS transistor Q6 is also electrically connected to pin 2 of connector CN13 through diode D15. Pin 2 of connector CN13 is also electrically connected to the boost circuit, and pin 4 of connector CN13 is grounded.

[0104] One end of resistor R149 is electrically connected to the base of transistor Q12, and the other end of resistor R149 is electrically connected to the 3.3V power supply terminal through resistor R155. The emitter of transistor Q12 is grounded, and the collector of transistor Q12 is electrically connected to the gate of NMOS transistor Q10. The gate of NMOS transistor Q10 is also connected to the common terminal of the boost device and resistor R140 through resistor R145. One end of resistor R150 is connected to the common terminal of the gate of NMOS transistor Q10 and resistor R145, and the other end of resistor R150 is grounded. The source of NMOS transistor Q10 is grounded. The drain of NMOS transistor Q10 is electrically connected to pin 3 of connector CN13, and the drain of NMOS transistor Q10 is also electrically connected to pin 2 of connector CN13 through diode D17.

[0105] In the A-phase relay opening and closing drive circuit, the other end of resistor R139 is electrically connected to the first signal output pin of the decoder in the closing drive signal interlock circuit, and the other end of resistor R149 is electrically connected to the first signal output pin of the decoder in the opening drive signal interlock circuit; pin 1 of connector CN13 is also electrically connected to the closing coil of the A-phase single-pole double-throw relay, and pin 3 of connector CN13 is also electrically connected to the opening coil of the A-phase single-pole double-throw relay.

[0106] In the B-phase relay opening and closing drive circuit, the other end of resistor R139 is electrically connected to the second signal output pin of the decoder in the closing drive signal interlock circuit, and the other end of resistor R149 is electrically connected to the second signal output pin of the decoder in the opening drive signal interlock circuit; pin 1 of connector CN13 is also electrically connected to the closing coil of the B-phase single-pole double-throw relay, and pin 3 of connector CN13 is also electrically connected to the opening coil of the B-phase single-pole double-throw relay.

[0107] In the C-phase relay opening and closing drive circuit, the other end of resistor R139 is electrically connected to the third signal output pin of the decoder in the closing drive signal interlock circuit, and the other end of resistor R149 is electrically connected to the third signal output pin of the decoder in the opening drive signal interlock circuit; pin 1 of connector CN13 is also electrically connected to the closing coil of the C-phase single-pole double-throw relay, and pin 3 of connector CN13 is also electrically connected to the opening coil of the C-phase single-pole double-throw relay.

[0108] Since the A-phase relay opening and closing drive circuit, the B-phase relay opening and closing drive circuit, and the C-phase relay opening and closing drive circuit all have the same second circuit structure, this embodiment will use the A-phase relay opening and closing drive circuit as an example for explanation. Figure 6 Specifically, it includes the A-phase relay opening and closing drive circuit, and the B-phase relay opening and closing drive circuit and the C-phase relay opening and closing drive circuit are similar.

[0109] exist Figure 6In this circuit, KA_ON is connected to pin Y3 of the 74HC138 decoder in the closing drive signal interlock circuit, KA_OFF is connected to pin Y3 of the 74HC138 decoder in the opening drive signal interlock circuit, and VDD_reply is connected to the boost circuit. This A-phase relay closing and opening drive circuit is connected to the A-phase single-pole double-throw relay via connector CN13. Its structure is divided into two parts: the upper part represents the A-phase closing drive sub-circuit, and the lower part represents the A-phase opening drive sub-circuit. The A-phase closing drive sub-circuit mainly consists of an NPN transistor Q8 and an NMOS transistor Q6. When the KA_ON signal is low, transistor Q8 is cut off. Resistors R140 and R137 divide VDD_RELAY to obtain VDD_VRELAY / 2. This provides the gate voltage for NMOS transistor Q6, thus turning it on. Simultaneously, it provides a positive drive signal to the closing coil of the A-phase single-pole double-throw relay connected between pins 1 and 2 of connector C13. Conversely, when KA_ON is high, Q8 is on and Q6 is off, providing no A-phase closing signal. The principle of the A-phase opening drive sub-circuit is similar. The logic relationship of the A-phase relay opening and closing drive circuit is shown in Table 6 (1 represents high level, 0 represents low level).

[0110] Table 6 shows the logic relationship of the A-phase relay opening and closing drive circuit.

[0111] KA_ON KA_OFF Relay status 0 1 Closing the circuit breaker 1 0 Trip switch 1 1 No action 0 0 Not allowed

[0112] The circuit structure and principle of the B-phase relay opening and closing drive circuit and the C-phase relay opening and closing drive circuit are the same as those of the A-phase relay opening and closing drive circuit, and specific details will not be repeated here. Similarly, the logic relationship tables of the B-phase relay opening and closing drive circuit and the C-phase relay opening and closing drive circuit are shown in Table 7 and Table 8, respectively.

[0113] Table 7B shows the logic relationship of the phase B relay opening and closing drive circuit.

[0114] KB_ON KB_OFF Relay status 0 1 Closing the circuit breaker 1 0 Trip switch 1 1 No action 0 0 Not allowed

[0115] Table 8 shows the logic relationship of the C-phase relay opening and closing drive circuit.

[0116] KC_ON KC_OFF Relay status 0 1 Closing the circuit breaker 1 0 Trip switch 1 1 No action 0 0 Not allowed

[0117] Through the above Figure 6 The A-phase relay opening and closing drive circuit shown, as well as the B-phase relay opening and closing drive circuit and C-phase relay opening and closing drive circuit with the same structure, are combined with... Figure 5The 74HC138 decoder shown in the diagram, which forms the interlock circuits for the closing drive signal and the opening drive signal, demonstrates that the 74HC138 outputs exactly one L-level signal. Therefore, it effectively avoids the load-side open-circuit problem caused by the simultaneous driving of three three-phase single-pole double-throw relays.

[0118] Preferably, such as Figure 7 As shown, the circuit breaker drive device further includes an A-phase circuit breaker status feedback circuit, a B-phase circuit breaker status feedback circuit, and a C-phase circuit breaker status feedback circuit.

[0119] The A-phase opening and closing status feedback circuit is electrically connected to the control device and the A-phase single-pole double-throw relay, respectively. The B-phase opening and closing status feedback circuit is electrically connected to the control device and the B-phase single-pole double-throw relay, respectively. The C-phase opening and closing status feedback circuit is electrically connected to the control device and the C-phase single-pole double-throw relay, respectively.

[0120] The above-mentioned three-phase opening and closing status feedback circuit can realize the opening and closing status feedback of three single-pole double-throw relays, further improving the MCU's control and driving capability for the series three-phase dual-coil magnetic latching relay, thereby improving the reliability of the entire drive control system.

[0121] Specifically, such as Figure 6 As shown, the A-phase opening and closing status feedback circuit, the B-phase opening and closing status feedback circuit, and the C-phase opening and closing status feedback circuit all have the same third circuit structure.

[0122] The third circuit structure includes a transistor Q14, resistors R147, R151, R157, and capacitor C62. The emitter of transistor Q14 is grounded, the collector of transistor Q14 is electrically connected to the control device, and the collector of transistor Q14 is also electrically connected to a 3.3V power supply terminal through resistor R151. One end of resistor R147 is connected to the common terminal between resistor R151 and the 3.3V power supply terminal. One end of capacitor C62 is connected to the common terminal between the collector of transistor Q14 and the control device, and the other end of capacitor C62 is grounded.

[0123] In the A-phase opening and closing status feedback circuit, the other end of the resistor R147 is electrically connected to pin 5 of the connector in the A-phase relay opening and closing drive circuit, and the base of the transistor Q14 is electrically connected to pin 5 of the connector in the A-phase relay opening and closing drive circuit through the corresponding resistor R157.

[0124] In the B-phase opening and closing status feedback circuit, the other end of the resistor R147 is electrically connected to pin 5 of the connector in the B-phase relay opening and closing drive circuit, and the base of the transistor Q14 is electrically connected to pin 5 of the connector in the B-phase relay opening and closing drive circuit through the corresponding resistor R157.

[0125] In the C-phase opening and closing status feedback circuit, the other end of the resistor R147 is electrically connected to pin 5 of the connector in the C-phase relay opening and closing drive circuit, and the base of the transistor Q14 is electrically connected to pin 5 of the connector in the C-phase relay opening and closing drive circuit through the corresponding resistor R157.

[0126] Since the A-phase opening / closing status feedback circuit, the B-phase opening / closing status feedback circuit, and the C-phase opening / closing status feedback circuit all have the same third circuit structure, this embodiment uses the A-phase relay opening / closing drive circuit as an example for explanation. Figure 6 Specifically, it includes the A-phase opening and closing status feedback circuit, and the B-phase and C-phase opening and closing status feedback circuits are similarly implemented; further details will not be elaborated here. Figure 6 In the circuit, / KA_ON_B is the feedback pin that feeds back the opening and closing status of phase A to the MCU. When the contacts of the phase A single-pole double-throw relay are closed, pins 4 and 5 on connector CN13 are shorted, the base voltage of transistor Q14 changes from 3.3V to 0V, and the state of transistor Q14 changes from on to off. Therefore, the state of the / KA_ON_B signal changes from high level to low level. The MCU can then use GPIO to read the state of this signal to determine the state of the phase A single-pole double-throw relay contacts.

[0127] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A magnetic latching relay drive control system applied to a commutation switch, characterized in that, Includes control devices, drive power switch devices, opening and closing drive devices, and series-connected three-phase dual-coil magnetic latching relays; The control device is electrically connected to the drive power switch and the opening and closing drive device respectively. The drive power switch is electrically connected to the opening and closing drive device, and the opening and closing drive device is electrically connected to the series three-phase double coil magnetic latching relay. The control device is used to issue control commands to the drive power switch device and the opening and closing drive device according to the preset computer program; the drive power switch device is used to control the opening and closing of the drive device according to the control commands issued by the control device. The opening and closing drive device is used to control the opening and closing of each relay in the series three-phase double coil magnetic latching relay under the drive of the drive power switch device according to the control command issued. The series-connected three-phase dual-coil magnetic latching relay includes a phase A single-pole double-throw relay, a phase B single-pole double-throw relay and a phase C single-pole double-throw relay; The A-phase single-pole double-throw relay, the B-phase single-pole double-throw relay, and the C-phase single-pole double-throw relay all include a tripping coil, a closing coil, a moving contact, a first stationary contact, and a second stationary contact; The opening coil, closing coil, opening coil, closing coil, opening coil, closing coil, opening coil, and closing coil of the A-phase single-pole double-throw relay, as well as the C-phase single-pole double-throw relay, are all electrically connected to the opening and closing drive device. The first stationary contact of the A-phase single-pole double-throw relay is suspended. The second stationary contact of the A-phase single-pole double-throw relay is electrically connected to the A-phase of the three-phase power supply. The moving contact of the A-phase single-pole double-throw relay is electrically connected to the first stationary contact of the B-phase single-pole double-throw relay. The second stationary contact of the B-phase single-pole double-throw relay is electrically connected to the B-phase of the three-phase power supply. The moving contact of the B-phase single-pole double-throw relay is electrically connected to the first stationary contact of the C-phase single-pole double-throw relay. The second stationary contact of the C-phase single-pole double-throw relay is electrically connected to the C-phase of the three-phase power supply. The moving contact of the C-phase single-pole double-throw relay is electrically connected to the load.

2. The magnetic latching relay drive control system for a commutation switch according to claim 1, characterized in that, The drive power switch device includes a switch control circuit and a boost circuit. The control device is electrically connected to the boost circuit through the switch control circuit, and the boost circuit is electrically connected to the opening and closing drive device.

3. The magnetic latching relay drive control system for a commutation switch according to claim 2, characterized in that, The switch control circuit includes a PMOS transistor Q1, a transistor Q2, resistors R6, R7, R11, and R12; The gate of PMOS transistor Q1 is electrically connected to the collector of transistor Q2 through resistor R7. The source of PMOS transistor Q1 is electrically connected to the 24V power supply terminal. One end of resistor R6 is connected to the common terminal between the source of PMOS transistor Q1 and the 24V power supply terminal, and the other end of resistor R6 is connected to the common terminal between the gate of PMOS transistor Q1 and resistor R7. The drain of PMOS transistor Q1 is electrically connected to the boost circuit. The base of transistor Q2 is electrically connected to the control device through resistor R10. The emitter of transistor Q2 is grounded. One end of resistor R12 is connected to the common terminal between resistor R10 and the control device, and the other end of resistor R12 is grounded.

4. The magnetic latching relay drive control system for a commutation switch according to claim 3, characterized in that, The boost circuit includes a voltage regulator chip U1, capacitors CD1, CD2, CD3, C1, C2, C3, inductor L1, resistors R4, R8, R9, and Schottky diode D3. The first ground pin GND1 and the second ground pin GND2 of the voltage regulator chip U1 are both grounded. The voltage input pin VIN of the voltage regulator chip U1 is electrically connected to the drain of the PMOS transistor Q1. The voltage input pin VIN of the voltage regulator chip U1 is also grounded through the capacitor C2. One end of the capacitor CD1 is electrically connected to the drain of the PMOS transistor Q1, and the other end of the capacitor CD1 is grounded. The phase compensation pin COMP of the voltage regulator chip U1 is grounded through the resistor R8 and the capacitor C3 in sequence. One end of the inductor L1 is electrically connected to the voltage input pin VIN of the voltage regulator chip U1, and the other end of the inductor L1 is electrically connected to the switching pin SW of the voltage regulator chip U1. The switching pin SW of the voltage regulator chip U1 is also electrically connected to the circuit breaker drive device through the Schottky diode D3. One end of the resistor R4 is connected to the common terminal between the Schottky diode D3 and the circuit breaker drive device, and the other end of the resistor R4 is grounded through the resistor R9. The feedback pin FB of the voltage regulator chip U1 is connected to the common terminal of the resistors R4 and R9. One end of capacitor CD2, one end of capacitor CD3, and one end of capacitor C1 are all connected to the common terminal between the Schottky diode D3 and the opening and closing drive device, and the other ends of capacitor CD2, capacitor CD3, and capacitor C1 are all grounded.

5. The magnetic latching relay drive control system for a commutation switch according to claim 2, characterized in that, The circuit breaker opening and closing drive device includes a closing drive signal interlock circuit, a closing drive signal interlock circuit, an A-phase relay opening and closing drive circuit, a B-phase relay opening and closing drive circuit, and a C-phase relay opening and closing drive circuit. The control device is electrically connected to the closing drive signal interlock circuit and the opening drive signal interlock circuit, respectively. The closing drive signal interlock circuit is electrically connected to the A-phase relay opening and closing drive circuit, the B-phase relay opening and closing drive circuit, and the C-phase relay opening and closing drive circuit, respectively. The opening drive signal interlock circuit is electrically connected to the A-phase relay opening and closing drive circuit, the B-phase relay opening and closing drive circuit, and the C-phase relay opening and closing drive circuit, respectively. The A-phase relay opening and closing drive circuit is electrically connected to the boost circuit, the opening coil of the A-phase single-pole double-throw relay, and the closing coil of the A-phase single-pole double-throw relay, respectively. The B-phase relay opening and closing drive circuit is electrically connected to the boost circuit, the opening coil of the B-phase single-pole double-throw relay, and the closing coil of the B-phase single-pole double-throw relay, respectively. The C-phase relay opening and closing drive circuit is electrically connected to the boost circuit, the opening coil of the C-phase single-pole double-throw relay, and the closing coil of the C-phase single-pole double-throw relay, respectively.

6. The magnetic latching relay drive control system for a commutation switch according to claim 5, characterized in that, The closing drive signal interlock circuit and the opening drive signal interlock circuit have the same first circuit structure; The first circuit structure includes a 74HC138 decoder; all three signal input pins of the decoder are electrically connected to the control device, the first signal output pin of the decoder is electrically connected to the A-phase relay opening and closing drive circuit, the second signal output pin of the decoder is electrically connected to the B-phase relay opening and closing drive circuit, and the third signal output pin of the decoder is electrically connected to the C-phase relay opening and closing drive circuit.

7. The magnetic latching relay drive control system for a commutation switch according to claim 6, characterized in that, The A-phase relay opening and closing drive circuit, the B-phase relay opening and closing drive circuit, and the C-phase relay opening and closing drive circuit all have the same second circuit structure. The second circuit structure includes NMOS transistor Q6, NMOS transistor Q10, transistor Q8, transistor Q12, resistors R137, R139, R140, R143, R145, R149, R150, R155, diode D15, diode D17, and a 5-pin connector CN13; One end of resistor R139 is electrically connected to the base of transistor Q8, and the other end of resistor R139 is electrically connected to the 3.3V power supply terminal through resistor R143. The emitter of transistor Q8 is grounded, and the collector of transistor Q8 is electrically connected to the gate of NMOS transistor Q6. The gate of NMOS transistor Q6 is also grounded through resistor R137. One end of resistor R140 is connected to the common terminal of the gate of NMOS transistor Q6 and resistor R137, and the other end of resistor R140 is electrically connected to the boost circuit. The source of NMOS transistor Q6 is grounded. The drain of NMOS transistor Q6 is electrically connected to pin 1 of connector CN13, and the drain of NMOS transistor Q6 is also electrically connected to pin 2 of connector CN13 through diode D15. Pin 2 of connector CN13 is also electrically connected to the boost circuit, and pin 4 of connector CN13 is grounded. One end of resistor R149 is electrically connected to the base of transistor Q12, and the other end of resistor R149 is electrically connected to the 3.3V power supply terminal through resistor R155. The emitter of transistor Q12 is grounded, and the collector of transistor Q12 is electrically connected to the gate of NMOS transistor Q10. The gate of NMOS transistor Q10 is also connected to the common terminal of the boost device and resistor R140 through resistor R145. One end of resistor R150 is connected to the common terminal of the gate of NMOS transistor Q10 and resistor R145, and the other end of resistor R150 is grounded. The source of NMOS transistor Q10 is grounded. The drain of NMOS transistor Q10 is electrically connected to pin 3 of connector CN13, and the drain of NMOS transistor Q10 is also electrically connected to pin 2 of connector CN13 through diode D17. In the A-phase relay opening and closing drive circuit, the other end of resistor R139 is electrically connected to the first signal output pin of the decoder in the closing drive signal interlock circuit, and the other end of resistor R149 is electrically connected to the first signal output pin of the decoder in the opening drive signal interlock circuit; pin 1 of connector CN13 is also electrically connected to the closing coil of the A-phase single-pole double-throw relay, and pin 3 of connector CN13 is also electrically connected to the opening coil of the A-phase single-pole double-throw relay. In the B-phase relay opening and closing drive circuit, the other end of resistor R139 is electrically connected to the second signal output pin of the decoder in the closing drive signal interlock circuit, and the other end of resistor R149 is electrically connected to the second signal output pin of the decoder in the opening drive signal interlock circuit; pin 1 of connector CN13 is also electrically connected to the closing coil of the B-phase single-pole double-throw relay, and pin 3 of connector CN13 is also electrically connected to the opening coil of the B-phase single-pole double-throw relay. In the C-phase relay opening and closing drive circuit, the other end of resistor R139 is electrically connected to the third signal output pin of the decoder in the closing drive signal interlock circuit, and the other end of resistor R149 is electrically connected to the third signal output pin of the decoder in the opening drive signal interlock circuit; pin 1 of connector CN13 is also electrically connected to the closing coil of the C-phase single-pole double-throw relay, and pin 3 of connector CN13 is also electrically connected to the opening coil of the C-phase single-pole double-throw relay.

8. The magnetic latching relay drive control system for a commutation switch according to claim 7, characterized in that, The circuit breaker opening and closing drive device also includes an A-phase circuit breaker opening and closing status feedback circuit, a B-phase circuit breaker opening and closing status feedback circuit, and a C-phase circuit breaker opening and closing status feedback circuit. The A-phase opening and closing status feedback circuit is electrically connected to the control device and the A-phase single-pole double-throw relay, respectively. The B-phase opening and closing status feedback circuit is electrically connected to the control device and the B-phase single-pole double-throw relay, respectively. The C-phase opening and closing status feedback circuit is electrically connected to the control device and the C-phase single-pole double-throw relay, respectively.

9. The magnetic latching relay drive control system for a commutation switch according to claim 8, characterized in that, The A-phase opening and closing status feedback circuit, the B-phase opening and closing status feedback circuit, and the C-phase opening and closing status feedback circuit all have the same third circuit structure. The third circuit structure includes a transistor Q14, resistors R147, R151, R157, and capacitor C62. The emitter of transistor Q14 is grounded, the collector of transistor Q14 is electrically connected to the control device, and the collector of transistor Q14 is also electrically connected to a 3.3V power supply terminal through resistor R151. One end of resistor R147 is connected to the common terminal between resistor R151 and the 3.3V power supply terminal. One end of capacitor C62 is connected to the common terminal between the collector of transistor Q14 and the control device, and the other end of capacitor C62 is grounded. In the A-phase opening and closing status feedback circuit, the other end of the resistor R147 is electrically connected to pin 5 of the connector in the A-phase relay opening and closing drive circuit, and the base of the transistor Q14 is electrically connected to pin 5 of the connector in the A-phase relay opening and closing drive circuit through the corresponding resistor R157. In the B-phase opening and closing status feedback circuit, the other end of the resistor R147 is electrically connected to pin 5 of the connector in the B-phase relay opening and closing drive circuit, and the base of the transistor Q14 is electrically connected to pin 5 of the connector in the B-phase relay opening and closing drive circuit through the corresponding resistor R157. In the C-phase opening and closing status feedback circuit, the other end of the resistor R147 is electrically connected to pin 5 of the connector in the C-phase relay opening and closing drive circuit, and the base of the transistor Q14 is electrically connected to pin 5 of the connector in the C-phase relay opening and closing drive circuit through the corresponding resistor R157.

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