Voltage protection circuit of circuit breaker and circuit breaker device

Abstract

The utility model provides a voltage protection circuit of a circuit breaker and a circuit breaker device. The circuit comprises a voltage processing module, a voltage sampling module, a voltage protection module and a tripping module, four input ends of the voltage processing module are respectively connected with a first live wire voltage, a second live wire voltage, a third live wire voltage and a zero line voltage, three output ends of the voltage processing module are respectively connected with three input ends of the voltage sampling module, and a fourth output end of the voltage processing module is respectively connected with three input ends of the voltage sampling module; the output end of the voltage sampling module is connected with the input end of the voltage protection module, and the voltage sampling module samples a signal output by the voltage processing module and outputs the signal to the voltage protection module; the output end of the voltage protection module is connected with the input end of the tripping module, and the voltage protection module sends a tripping instruction to the tripping module according to a signal output by the voltage sampling module so as to reduce the risk of electric shock during voltage measurement.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage electrical appliances, and in particular to a voltage protection circuit of a circuit breaker and a circuit breaker device. Background Art

[0002] Circuit breakers require voltage sampling during operation, typically using a metering chip. While metering chips offer high voltage measurement accuracy, they pose a safety hazard. When measuring voltage, the metering chip requires the neutral phase to be connected to the power ground of the metering chip. Misconnecting the neutral phase can easily lead to electric shock.

[0003] Currently, to address the risk of electric shock caused by misconnection of the N phase, isolation is achieved through an isolation voltage transformer or the power supply system, but this is costly and inconvenient.

[0004] Therefore, there are certain limitations in the prior art of using a metering chip to measure voltage in a circuit breaker. Utility Model Content

[0005] The purpose of this application is to address the deficiencies in the above-mentioned prior art and provide a voltage protection circuit and a circuit breaker device for a circuit breaker, so as to solve the practical problem that the circuit breaker in the prior art has certain limitations in using a metering chip to measure voltage.

[0006] To achieve the above objectives, the technical solutions adopted in the embodiments of the present application are as follows:

[0007] In a first aspect, an embodiment of the present application provides a voltage protection circuit for a circuit breaker, the circuit comprising:

[0008] Voltage processing module, voltage sampling module, voltage protection module and tripping module;

[0009] The first input end of the voltage processing module is connected to the first live line voltage of the circuit breaker, the second input end of the voltage processing module is connected to the second live line voltage of the circuit breaker, the third input end of the voltage processing module is connected to the third live line voltage of the circuit breaker, and the fourth input end of the voltage processing module is connected to the neutral line voltage of the circuit breaker. The first output end of the voltage processing module is connected to the first input end of the voltage sampling module, the second output end of the voltage processing module is connected to the second input end of the voltage sampling module, the third output end of the voltage processing module is connected to the third input end of the voltage sampling module, and the fourth output end of the voltage processing module is respectively connected to the first input end, the second input end, and the third input end of the voltage sampling module. The first live line voltage, the second live line voltage, the third live line voltage, and the neutral line voltage are all isolated from the ground in the voltage processing module, and the first live line voltage, the second live line voltage, the third live line voltage, and the neutral line voltage are isolated from each other.

[0010] The output end of the voltage sampling module is connected to the input end of the voltage protection module, and the voltage sampling module is used to sample the signal output by the voltage processing module and output it to the voltage protection module;

[0011] The output end of the voltage protection module is connected to the input end of the tripping module, and the voltage protection module is used to send a tripping instruction to the tripping module according to the signal output by the voltage sampling module.

[0012] As an optional implementation, the voltage processing module includes: a first isolation submodule, a second isolation submodule, a third isolation submodule and a fourth isolation submodule;

[0013] The input end of the first isolation submodule is connected to the first live line voltage of the circuit breaker, the first output end of the first isolation submodule is connected to the first input end of the voltage sampling module, and the second output end of the first isolation submodule and the third output end of the first isolation submodule are grounded;

[0014] The input end of the second isolation submodule is connected to the second live line voltage of the circuit breaker, the first output end of the second isolation submodule is connected to the second input end of the voltage sampling module, and the second output end of the second isolation submodule and the third output end of the second isolation submodule are grounded;

[0015] The input end of the third isolation submodule is connected to the third live line voltage of the circuit breaker, the first output end of the third isolation submodule is connected to the third input end of the voltage sampling module, and the second output end of the third isolation submodule and the third output end of the second isolation submodule are grounded;

[0016] The input end of the fourth isolation sub-module is connected to the neutral line voltage of the circuit breaker, the first output end of the fourth isolation sub-module is respectively connected to the first input end of the voltage sampling module, the second input end of the voltage sampling module and the third input end of the voltage sampling module, and the second output end of the fourth isolation sub-module and the third output end of the fourth isolation sub-module are grounded.

[0017] As an optional implementation, the first isolation submodule includes: a first step-down unit, a first operational amplifier follower unit, and a first anti-aliasing unit;

[0018] The input end of the first step-down unit is connected to the first live line voltage of the circuit breaker, the first output end of the first step-down unit is connected to the first input end of the first operational amplifier follower unit, and the second output end of the first step-down unit is grounded;

[0019] The second input terminal of the first operational amplifier follower unit is connected to the output terminal of the first operational amplifier follower unit, and the output terminal of the first operational amplifier follower unit is connected to the input terminal of the first anti-aliasing unit;

[0020] A first output terminal of the first anti-aliasing unit is connected to a first input terminal of the voltage sampling module, and a second output terminal of the first anti-aliasing unit is grounded.

[0021] As an optional implementation, the first voltage-reducing unit includes: a first resistor network and a first resistor;

[0022] The first resistor network includes at least one resistor, an input end of the first resistor network is connected to the first live line voltage of the circuit breaker, and an output end of the first resistor network is connected to one end of the first resistor and the first input end of the first operational amplifier follower unit;

[0023] The other end of the first resistor is grounded.

[0024] As an optional implementation, the first anti-aliasing unit includes: a second resistor and a first capacitor;

[0025] One end of the second resistor is connected to the output end of the first operational amplifier follower unit, and the other end of the second resistor is connected to one end of the first capacitor and the first input end of the voltage sampling module;

[0026] The other end of the first capacitor is grounded.

[0027] As an optional implementation, the voltage sampling module is specifically used to obtain a first voltage effective value and a first sampling signal based on the differential signal sampling of the first live line voltage and the neutral line voltage, obtain a second voltage effective value and a second sampling signal based on the differential signal sampling of the second live line voltage and the neutral line voltage, and obtain a third voltage effective value and a third sampling signal based on the differential signal sampling of the third live line voltage and the neutral line voltage, and output the first voltage effective value, the second voltage effective value and the third voltage effective value through the first output end of the voltage sampling module, and output the first sampling signal, the second sampling signal and the third sampling signal through the second output end of the voltage sampling module.

[0028] As an optional implementation, the circuit further includes: a power supply module;

[0029] The power supply module is respectively connected to the power supply end of the voltage processing module, the power supply end of the voltage sampling module, the power supply end of the voltage protection module and the power supply end of the tripping module;

[0030] The power supply module obtains power supply energy through an external fast saturation transformer and an external power supply connected in parallel.

[0031] As an optional implementation, the circuit further includes: a display module;

[0032] The display module is connected to the voltage protection module;

[0033] The voltage protection module is further configured to output the data to be displayed to the display module for display.

[0034] As an optional implementation, the circuit further includes: a communication module;

[0035] One end of the communication module is connected to the voltage protection module, and the other end of the communication module is used to connect to an external device;

[0036] The voltage protection module is further configured to output the data to be transmitted to the communication module, and the communication module outputs the data to be transmitted to the external device.

[0037] In a second aspect, an embodiment of the present application provides a circuit breaker device, which includes the voltage protection circuit of the circuit breaker and the circuit breaker module described in the first aspect.

[0038] The beneficial effects of this application are:

[0039] The present application provides a voltage protection circuit and circuit breaker device for a circuit breaker. A voltage processing module, a voltage sampling module, a voltage protection module and a tripping module are set in the voltage protection circuit of the circuit breaker. The four input terminals of the voltage processing module are respectively connected to the first live line voltage, the second live line voltage, the third live line voltage and the neutral line voltage of the circuit breaker. Through voltage processing, the first live line voltage, the second live line voltage, the third live line voltage and the neutral line voltage are isolated from the ground in the voltage processing module, eliminating the risk brought by strong electricity. The first live line voltage, the second live line voltage, the third live line voltage and the neutral line voltage are isolated from each other to avoid mutual crosstalk. The voltage sampling module samples the voltage according to the signal output by the voltage processing module and sends a signal to the voltage protection module so that the voltage protection module can quickly determine whether the circuit has an overvoltage fault or an undervoltage fault according to the signal output by the voltage sampling module. When it is determined that the circuit has an overvoltage fault or an undervoltage fault, a tripping instruction is generated and sent to the tripping module, thereby cutting off the circuit and accurately realizing the over-voltage and undervoltage protection of the circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0041] Figure 1 A schematic structural diagram of a voltage protection circuit for a circuit breaker provided in an embodiment of the present application;

[0042] Figure 2 A schematic diagram of the structure of a voltage processing module in a voltage protection circuit of a circuit breaker provided in an embodiment of the present application;

[0043] Figure 3 A schematic structural diagram of a first isolation submodule of a voltage processing module in a voltage protection circuit of a circuit breaker provided in an embodiment of the present application;

[0044] Figure 4 Another structural diagram of a voltage processing module in a voltage protection circuit of a circuit breaker provided in an embodiment of the present application;

[0045] Figure 5 This is a structural schematic diagram of a first voltage reduction unit of a first isolation submodule of a voltage processing module in a voltage protection circuit of a circuit breaker provided in an embodiment of the present application;

[0046] Figure 6 This is a structural schematic diagram of a first anti-aliasing unit of a first isolation submodule of a voltage processing module in a voltage protection circuit of a circuit breaker provided in an embodiment of the present application;

[0047] Figure 7 Another structural diagram of the voltage protection circuit of the circuit breaker provided in an embodiment of the present application;

[0048] Figure 8 Another structural diagram of the voltage protection circuit of the circuit breaker provided in an embodiment of the present application;

[0049] Figure 9 This is another structural schematic diagram of the voltage protection circuit of the circuit breaker provided in an embodiment of the present application.

[0050] Icons: Voltage processing module: 11; Voltage sampling module: 12; Voltage protection module: 13; Trip module: 14; Power supply module: 15; Display module: 16; Communication module: 17; First isolator module: 111; Second isolator module: 112; Third isolator module: 113; Fourth isolator module: 114; First step-down module: 1111; First op amp follower unit: 1112; First anti-aliasing unit: 1113; Second step-down unit: 1121; Second op amp follower unit: 1122; Second anti-aliasing unit: 1123; Third step-down unit: 1131; Third op amp follower unit: 1132; Third anti-aliasing unit: 1133; Fourth step-down unit: 1141; Fourth op amp follower unit: 1142; Fourth anti-aliasing unit: 1143; First resistor network: R A ; First resistor: R1; Second resistor: R2; First capacitor: C1. DETAILED DESCRIPTION

[0051] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0052] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0053] It should be noted that similar reference numerals and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined or explained in subsequent figures. In the description of this application, the terms "first," "second," "third," etc. are used only to distinguish the description and are not to be understood as indicating or implying relative importance.

[0054] In the description of this application, unless otherwise specified or limited, the terms "disposed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0055] In the field of low-voltage electrical appliances, when voltage is sampled through a metering chip in a circuit breaker, the N phase needs to be connected to the metering chip's power ground. Misconnecting the N phase can easily lead to electric shock accidents, posing a safety hazard. Currently, isolation transformers are commonly used to isolate the power system to reduce the risk of electric shock caused by misconnecting the N phase, but this method is costly and inconvenient, and has certain limitations.

[0056] Based on the above problems, the embodiment of the present application provides a voltage protection circuit for a circuit breaker, including a voltage processing module, a voltage sampling module, a voltage protection module, a tripping module, a power module, a display module and a communication module. Through the resistance isolation, voltage following and anti-aliasing of each isolation submodule in the voltage processing module, the first live line voltage, the second live line voltage, the third live line voltage and the neutral line voltage of the circuit breaker are all isolated from the ground in the voltage processing module, and the first live line voltage, the second live line voltage, the third live line voltage and the neutral line voltage are isolated from each other, so that the voltage acquisition module measures the voltage when the N phase is not grounded, eliminating the risk brought by strong electricity and avoiding electric shock accidents. The voltage sampling module sends each voltage effective value to the voltage protection module at low speed through low-speed communication, and sends each voltage sampling signal to the voltage protection module at high speed through high-speed communication, so that the voltage protection module sends a tripping instruction to the tripping module according to the voltage sampling signals transmitted at high speed by the voltage sampling module when an overvoltage fault or undervoltage fault occurs in the circuit, thereby quickly cutting off the circuit and improving the safety of the circuit.

[0057] Figure 1 A schematic diagram of the structure of the voltage protection circuit of the circuit breaker provided in the embodiment of the present application is shown as follows: Figure 1 As shown, the voltage protection circuit of the circuit breaker includes a voltage processing module 11 , a voltage sampling module 12 , a voltage protection module 13 and a tripping module 14 .

[0058] Optionally, refer to Figure 1In the circuit breaker's voltage protection circuit, a voltage processing module 11 is connected to the circuit breaker busbar's three-phase, four-wire voltage ABCN. The three-phase, four-wire voltage consists of three live wires (A, B, and C) and one neutral wire (N). A voltage sampling module 12 is connected to the voltage processing module 11 and the voltage protection module 13, respectively. The voltage protection module 13 is also connected to the trip module 14.

[0059] The first input terminal of the voltage processing module 11 is connected to the first live line voltage U of the circuit breaker. A The second input terminal of the voltage processing module 11 is connected to the second live wire voltage U of the circuit breaker B The third input terminal of the voltage processing module 11 is connected to the third live line voltage U of the circuit breaker. C The fourth input terminal of the voltage processing module 11 is connected to the zero line voltage U of the circuit breaker. N The first output terminal of the voltage processing module 11 is connected to the first input terminal of the voltage sampling module 12, the second output terminal of the voltage processing module 11 is connected to the second input terminal of the voltage sampling module 12, the third output terminal of the voltage processing module 11 is connected to the third input terminal of the voltage sampling module 12, and the fourth output terminal of the voltage processing module 11 is connected to the first input terminal, the second input terminal and the third input terminal of the voltage sampling module 12 respectively. A , the second live wire voltage U B , the third live wire voltage U C And the neutral voltage U N In the voltage processing module 11, both are isolated from the ground, and the first live line voltage U A , the second live wire voltage U B , the third live wire voltage U C And the neutral voltage U N Isolate from each other.

[0060] Optionally, continue with reference to Figure 1 The voltage processing module 11 includes four input terminals and three output terminals, wherein the first input terminal of the voltage processing module 11, the second input terminal of the voltage processing module 11, the third input terminal of the voltage processing module 11, and the fourth input terminal of the voltage processing module 11 are respectively connected to the first live line voltage U in the three-phase four-line voltage ABCN of the circuit breaker busbar. A , the second live wire voltage U B , the third live wire voltage U C And the neutral voltage U N .

[0061] Continue to refer to Figure 1The voltage sampling module 12 includes three input terminals. The first output terminal of the voltage processing module 11, the second output terminal of the voltage processing module 11, and the third output terminal of the voltage processing module 11 are respectively connected to the first input terminal of the voltage sampling module 12, the second input terminal of the voltage sampling module 12, and the third input terminal of the voltage sampling module 12. The fourth output terminal of the voltage processing module 11 is respectively connected to the first input terminal of the voltage sampling module 12, the second input terminal of the voltage sampling module 12, and the third input terminal of the voltage sampling module 12 to send the processed first live wire voltage U to the first input terminal of the voltage sampling module 12. A-P And the neutral voltage U after processing N-N , sends the processed second live wire voltage U to the second input terminal of the voltage sampling module 12 B-P And the neutral voltage U after processing N-N , sends the processed third live wire voltage U to the third input terminal of the voltage sampling module 12 C-P And the neutral voltage U after processing N-N .

[0062] It is worth noting that in the voltage processing module 11, by processing the first live line voltage U A , the second live wire voltage U B , the third live wire voltage U C And the neutral voltage U N Perform voltage processing so that the first live wire voltage U A , the second live wire voltage U B , the third live wire voltage U C And the neutral voltage U N In the voltage processing module 11, they are isolated from GND to eliminate the risk of strong electricity. A , the second live wire voltage U B , the third live wire voltage U C And the neutral voltage U N They are isolated from each other to avoid crosstalk between the three-phase four-wire voltages ABCN.

[0063] The output end of the voltage sampling module 12 is connected to the input end of the voltage protection module 13 . The voltage sampling module 12 is used to sample the signal output by the voltage processing module 11 and output the sample to the voltage protection module 13 .

[0064] Optionally, continue with reference to Figure 1, the output end of the voltage sampling module 12 is connected to the input end of the voltage protection module 13, so as to send the signal obtained by the voltage sampling module 12 according to the signal output by the voltage processing module 11 to the voltage protection module 13. Among them, the voltage sampling module 12 may include two output ends, and the voltage protection module 13 may include two input ends and one output end. Specifically, the first output end of the voltage sampling module 12 is connected to the first input end of the voltage protection module 13, and the second output end of the voltage sampling module 12 is connected to the second input end of the voltage protection module 13. The first output end of the voltage sampling module 12 communicates with the first input end of the voltage protection module 13 at low speed, and the second output end of the voltage sampling module 12 communicates with the second input end of the voltage protection module 13 at high speed. The voltage sampling module 12 sends the signal obtained by voltage sampling to the voltage protection module 13 through both low-speed communication and high-speed communication.

[0065] The output end of the voltage protection module 13 is connected to the input end of the tripping module 14 . The voltage protection module 13 is configured to send a tripping instruction to the tripping module 14 according to the signal output by the voltage sampling module 12 .

[0066] Optionally, continue with reference to Figure 1 The output end of the voltage protection module 13 is connected to the input end of the tripping module 14. The voltage protection module 13 quickly judges the overvoltage fault and undervoltage fault of the circuit according to the signal output by the voltage sampling module 12. When it is determined that the circuit has an overvoltage fault or an undervoltage fault, a tripping instruction is generated and sent to the tripping module 14, so that the magnetic flux tripper ( Figure 1 The circuit is tripped under the instruction of the tripping instruction (not shown), and the circuit is cut off to achieve over-voltage and under-voltage protection.

[0067] In this embodiment, a voltage processing module, a voltage sampling module, a voltage protection module, and a tripping module are provided in the voltage protection circuit of the circuit breaker. The four input terminals of the voltage processing module are respectively connected to the first live line voltage, the second live line voltage, the third live line voltage, and the neutral line voltage of the circuit breaker. Through voltage processing, the first live line voltage, the second live line voltage, the third live line voltage, and the neutral line voltage are all isolated from the ground in the voltage processing module, eliminating the risks brought by strong electricity. In addition, the first live line voltage, the second live line voltage, the third live line voltage, and the neutral line voltage are isolated from each other to avoid mutual crosstalk. The voltage sampling module samples the voltage according to the signal output by the voltage processing module and sends a signal to the voltage protection module so that the voltage protection module can quickly determine whether the circuit has an overvoltage fault or an undervoltage fault according to the signal output by the voltage sampling module. When it is determined that the circuit has an overvoltage fault or an undervoltage fault, a tripping instruction is generated and sent to the tripping module, thereby cutting off the circuit and accurately implementing overvoltage and undervoltage protection of the circuit.

[0068] Figure 2 This is a structural diagram of a voltage processing module in a voltage protection circuit of a circuit breaker provided in an embodiment of the present application, as shown in FIG. Figure 2 As shown, the voltage processing module 11 includes a first isolation submodule 111 , a second isolation submodule 112 , a third isolation submodule 113 and a fourth isolation submodule 114 .

[0069] Optionally, refer to Figure 2 The voltage processing module 11 includes four isolating submodules, namely a first isolating submodule 111, a second isolating submodule 112, a third isolating submodule 113 and a fourth isolating submodule 114. The first isolating submodule 111 is used to process the first live line voltage U A Perform voltage processing to obtain the first live wire voltage U after processing A-P The second isolating submodule 112 is used to control the second live line voltage U B Perform voltage processing to obtain the second live wire voltage U B-P The third isolating submodule 113 is used to control the third live line voltage U C Perform voltage processing to obtain the third live wire voltage U C-P The fourth isolating submodule 114 is used to isolate the circuit breaker from the neutral voltage U N Perform voltage processing to obtain the processed neutral voltage U N-N .

[0070] The input end of the first isolating submodule 111 is connected to the first live line voltage U of the circuit breaker. A The first output end of the first isolation submodule 111 is connected to the first input end of the voltage sampling module 12 , and the second output end of the first isolation submodule 111 and the third output end of the first isolation submodule 111 are grounded.

[0071] Optionally, continue with reference to Figure 2 The first isolating submodule 111 includes an input terminal and three output terminals, wherein the input terminal of the first isolating submodule 111 is connected to the first live line voltage U of the circuit breaker. A The second output terminal of the first isolating submodule 111 and the third output terminal of the first isolating submodule 111 are grounded. A Perform voltage processing so that the first live wire voltage U A The first isolation submodule 111 is isolated from GND and is connected to the second live line voltage U B , the third live wire voltage U C And the neutral voltage U N Isolation, get the first live wire voltage U after processing A-PThe first output terminal of the first isolation submodule 111 is connected to the first input terminal of the voltage sampling module 12 so as to obtain the processed first live wire voltage U A-P The voltage is sent to the first input terminal of the voltage sampling module 12 .

[0072] The input end of the second isolation submodule 112 is connected to the second live line voltage U of the circuit breaker. B The first output terminal of the second isolation submodule 112 is connected to the second input terminal of the voltage sampling module 12 , and the second output terminal of the second isolation submodule 112 and the third output terminal of the second isolation submodule 112 are grounded.

[0073] Optionally, continue with reference to Figure 2 The second isolating submodule 112 includes an input terminal and three output terminals, wherein the input terminal of the second isolating submodule 112 is connected to the second live line voltage U of the circuit breaker. B The second output terminal of the second isolation submodule 112 and the third output terminal of the second isolation submodule 112 are grounded. B Perform voltage processing so that the second live wire voltage U B The second isolation submodule 112 is isolated from GND and is connected to the first live line voltage U A , the third live wire voltage U C And the neutral voltage U N Isolation, get the second live wire voltage U after processing B-P The first output terminal of the second isolation submodule 112 is connected to the second input terminal of the voltage sampling module 12 so as to obtain the processed second live wire voltage U B-P The voltage is sent to the second input terminal of the voltage sampling module 12 .

[0074] The input end of the third isolating submodule 113 is connected to the third live line voltage U of the circuit breaker. C The first output terminal of the third isolation submodule 113 is connected to the third input terminal of the voltage sampling module 12 , and the second output terminal of the third isolation submodule 113 and the third output terminal of the second isolation submodule 113 are grounded.

[0075] Optionally, continue with reference to Figure 2 The third isolating submodule 113 includes an input terminal and three output terminals, wherein the input terminal of the third isolating submodule 113 is connected to the third live line voltage U of the circuit breaker. C The second output terminal of the third isolating submodule 113 and the third output terminal of the third isolating submodule 113 are grounded. C Perform voltage processing so that the third live line voltage U C The third isolation submodule 113 is isolated from GND and is connected to the first live line voltage UA , the second live wire voltage U B And the neutral voltage U N Isolation, get the third live wire voltage U after processing C-P The first output terminal of the third isolation submodule 113 is connected to the third input terminal of the voltage sampling module 12 so as to obtain the processed third live wire voltage U C-P The voltage is sent to the third input terminal of the voltage sampling module 12 .

[0076] The input end of the fourth isolating submodule 114 is connected to the neutral voltage U N The first output end of the fourth isolation submodule 114 is respectively connected to the first input end of the voltage sampling module 12, the second input end of the voltage sampling module 12, and the third input end of the voltage sampling module 12, and the second output end of the fourth isolation submodule 114 and the third output end of the fourth isolation submodule 114 are grounded.

[0077] Optionally, continue with reference to Figure 2 The fourth isolating submodule 114 includes an input terminal and three output terminals, wherein the input terminal of the fourth isolating submodule 114 is connected to the zero line voltage U of the circuit breaker. N , the second output terminal of the fourth isolating submodule 114 and the third output terminal of the fourth isolating submodule 114 are grounded. N Perform voltage processing so that the neutral voltage U N The fourth isolation submodule 114 is isolated from GND and is connected to the first live line voltage U A , the second live wire voltage U B And the third live wire voltage U C Isolation, get the processed neutral voltage U N-N The first output terminal of the fourth isolation submodule 114 is connected to the first input terminal of the voltage sampling module 12, the second input terminal of the voltage sampling module 12 and the third input terminal of the voltage sampling module 12 respectively, so as to convert the processed third live wire voltage U C-P The voltages are respectively sent to the first input terminal of the voltage sampling module 12 , the second input terminal of the voltage sampling module 12 , and the third input terminal of the voltage sampling module 12 .

[0078] In this embodiment, the voltage processing module includes a first, second, third, and fourth isolator modules. Each isolator module processes the voltages of the connected circuit breaker to generate processed voltages. These voltages are isolated from ground within each isolator module and from one another, preventing crosstalk and reducing the risk of electric shock. Each isolator module transmits the processed voltages to the voltage sampling module, which then samples the voltages based on the processed voltages received from the isolator modules.

[0079] Figure 3 This is a structural diagram of the first isolation submodule of the voltage processing module in the voltage protection circuit of the circuit breaker provided in an embodiment of the present application, as shown in FIG. Figure 3 As shown, the first isolation submodule 111 includes: a first step-down unit 1111 , a first operational amplifier follower unit 1112 , and a first anti-aliasing unit 1113 .

[0080] Optionally, refer to Figure 3 The first isolation submodule 111 includes three units, namely a first step-down unit 1111, a first operational amplifier follower unit 1112 and a first anti-aliasing unit 1113. The first step-down unit 1111 is used to adjust the first live line voltage U A Perform voltage reduction and isolate the first live wire voltage U A and GND, and get the first live wire voltage U after stepping down A-S The first operational amplifier follower unit 1112 is used to adjust the first live line voltage U after the voltage is stepped down. A-S Perform voltage following processing to maintain the first live wire voltage U after voltage reduction A-S The amplitude and phase remain unchanged and are consistent with the second live wire voltage U after the voltage is stepped down. B-S , the third live wire voltage after voltage reduction U C-S And the zero line voltage U after voltage reduction N-S Isolation, get the voltage following the first live wire voltage U A-S The first anti-aliasing unit 1113 is used to follow the first live line voltage U A-S Perform filtering to obtain the processed first live wire voltage U A-P .

[0081] The input end of the first step-down unit 1111 is connected to the first live line voltage U of the circuit breaker. A The first output end of the first step-down unit 1111 is connected to the first input end of the first operational amplifier follower unit 1112, and the second output end of the first step-down unit 1111 is grounded.

[0082] Optionally, continue with reference to Figure 3 The first step-down unit 1111 includes an input terminal and two output terminals, wherein the input terminal of the first step-down unit 1111 serves as the input terminal of the first isolation submodule 111 and is connected to the first live line voltage U of the circuit breaker. A The second output terminal of the first step-down unit 1111 is grounded as the second output terminal of the first isolation submodule 111. The first step-down unit 1111 is grounded to the first live line voltage U A Perform voltage reduction processing on the first live wire voltage U A Perform signal reduction and isolate the first live wire voltage U A and GND, and get the first live wire voltage U after stepping downA-S The first output terminal of the first step-down unit 1111 is connected to the first input terminal of the first operational amplifier follower unit 1112, so as to convert the stepped-down first live line voltage U A-S The signal is sent to the first input terminal of the first operational amplifier follower unit 1112 .

[0083] The second input terminal of the first operational amplifier follower unit 1112 is connected to the output terminal of the first operational amplifier follower unit 1112 , and the output terminal of the first operational amplifier follower unit 1112 is connected to the input terminal of the first anti-aliasing unit 1113 .

[0084] Optionally, continue with reference to Figure 3 The first operational amplifier follower unit 1112 includes two input terminals, an output terminal, a positive power supply terminal, and a negative power supply terminal. The first operational amplifier follower unit 1112 can be a first operational amplifier voltage follower. The positive power supply terminal of the first operational amplifier follower unit 1112 is used to access the positive pole of the power supply voltage +VCC, and the negative power supply terminal of the first operational amplifier follower unit 1112 is used to access the negative pole of the power supply voltage -VSS. The first input terminal of the first operational amplifier follower unit 1112 is connected to the first output terminal of the first step-down unit 1111, and the second input terminal of the first operational amplifier follower unit 1112 is connected to the output terminal of the first operational amplifier follower unit 1112. The first operational amplifier follower unit 1112 is sensitive to the first live wire voltage U after step-down. A-S Perform voltage following processing so that the first live wire voltage U A-S The amplitude and phase of the second live wire voltage U after the voltage reduction are unchanged. B-S , the third live wire voltage after voltage reduction U C-S And the zero line voltage U after voltage reduction N-S Isolation, get the voltage following the first live wire voltage U A-S The output terminal of the first operational amplifier follower unit 1112 is connected to the input terminal of the first anti-aliasing unit 1113 so as to follow the voltage of the first live line voltage U A-S The signal is sent to the input end of the first anti-aliasing unit 1113 .

[0085] A first output terminal of the first anti-aliasing unit 1113 is connected to a first input terminal of the voltage sampling module 12 , and a second output terminal of the first anti-aliasing unit 1113 is grounded.

[0086] Optionally, continue with reference to Figure 3 The first anti-aliasing unit 1113 includes an input terminal and two output terminals, wherein the input terminal of the first anti-aliasing unit 1113 is connected to the output terminal of the first operational amplifier follower unit 1112 to access the first live line voltage U after voltage following. A-S The second output terminal of the first anti-aliasing unit 1113 is grounded as the third output terminal of the first isolation submodule 111. The first anti-aliasing unit 1113 follows the first live line voltage UA-S Perform filtering to obtain the processed first live wire voltage U A-P The first output terminal of the first anti-aliasing unit 1113 is connected to the first input terminal of the voltage sampling module 12 as the first output terminal of the first isolation submodule 111, so as to convert the processed first live line voltage U A-P The voltage is sent to the first input terminal of the voltage sampling module 12 .

[0087] In this embodiment, a first step-down unit, a first op amp follower unit, and a first anti-aliasing unit are provided in the first isolation submodule. The first step-down unit performs a step-down process on the first live wire voltage and isolates the first live wire voltage from the ground to obtain the stepped-down first live wire voltage. The first op amp follower unit performs a voltage following process on the stepped-down first live wire voltage, keeping the amplitude and phase of the stepped-down first live wire voltage unchanged, and isolates it from the stepped-down second live wire voltage, the stepped-down third live wire voltage, and the stepped-down neutral voltage to obtain the voltage-followed first live wire voltage. The first anti-aliasing unit is used to filter the voltage-followed first live wire voltage to obtain the processed first live wire voltage, and send the processed first live wire voltage to the first input terminal of the voltage sampling module. The first step-down unit, the first op amp follower unit, and the first anti-aliasing unit in the first isolation submodule reduce the risk of electric shock, prevent crosstalk, and improve the anti-interference capability of the voltage signal.

[0088] Accordingly, Figure 4 This is another structural diagram of the voltage processing module in the voltage protection circuit of the circuit breaker provided in the embodiment of the present application, as shown in FIG. Figure 4 As shown, the second isolation submodule 112 includes a second step-down unit 1121, a second operational amplifier follower unit 1122 and a second anti-aliasing unit 1123, wherein the second step-down unit 1121 is used to B Perform voltage reduction and isolate the second live wire voltage U B With GND, the second live wire voltage U is obtained after stepping down B-S The second operational amplifier follower unit 1122 is used to adjust the second live line voltage U after the voltage is reduced. B-S Perform voltage following processing to maintain the second live wire voltage U after voltage reduction B-S The amplitude and phase remain unchanged and are consistent with the first live wire voltage U after voltage reduction. A-S , the third live wire voltage after voltage reduction U C-S And the zero line voltage U after voltage reduction N-S Isolation, get the voltage following the second live wire voltage U B-S The second anti-aliasing unit 1123 is used to follow the second live line voltage U B-S Perform filtering to obtain the processed second live wire voltage U B-P And sent to the second input end of the voltage sampling module 12.

[0089] Accordingly, continue to refer to Figure 4 The third isolation submodule 113 includes a third step-down unit 1131, a third operational amplifier follower unit 1132 and a third anti-aliasing unit 1133, wherein the third step-down unit 1131 is used to C Perform voltage reduction and isolate the third live wire voltage U C With GND, the third live wire voltage U is obtained after stepping down C-S The third operational amplifier follower unit 1132 is used to adjust the third live line voltage U after the voltage is stepped down. C-S Perform voltage following processing to maintain the third live wire voltage U after voltage reduction C-S The amplitude and phase remain unchanged and are consistent with the first live wire voltage U after voltage reduction. A-S , the second live wire voltage after voltage reduction U B-S And the zero line voltage U after voltage reduction N-S Isolation, get the voltage following the third live wire voltage U C-S The third anti-aliasing unit 1133 is used to follow the third live line voltage U C-S Perform filtering to obtain the processed third live wire voltage U C-P And sent to the third input terminal of the voltage sampling module 12.

[0090] Accordingly, continue to refer to Figure 4 The fourth isolator module 114 includes a fourth step-down unit 1141, a fourth operational amplifier follower unit 1142 and a fourth anti-aliasing unit 1143, wherein the fourth step-down unit 1141 is used to N Perform voltage reduction and isolate the neutral voltage U N and GND, and the zero line voltage U is obtained after voltage reduction N-S The fourth operational amplifier follower unit 1142 is used to adjust the zero line voltage U after the voltage is stepped down. N-S Perform voltage following processing to maintain the zero line voltage U after voltage reduction N-S The amplitude and phase remain unchanged and are consistent with the first live wire voltage U after voltage reduction. A-S , the second live wire voltage after voltage reduction U B-S And the third live wire voltage U after voltage reduction C-S Isolation, get the voltage following the neutral voltage U N-S The fourth anti-aliasing unit 1143 is used to follow the zero line voltage U N-S Perform filtering to obtain the processed neutral voltage U N-N The signals are sent to the first input terminal of the voltage sampling module 12 , the second input terminal of the voltage sampling module 12 , and the third input terminal of the voltage sampling module 12 respectively.

[0091] Figure 5This is a structural diagram of the first voltage reduction unit of the first isolation submodule of the voltage processing module in the voltage protection circuit of the circuit breaker provided in an embodiment of the present application, as shown in FIG. Figure 5 As shown, the first step-down unit 1111 includes: a first resistor network R A and a first resistor R1.

[0092] Optionally, refer to Figure 5 The first step-down unit 1111 includes a resistor network and a resistor, which are respectively the first resistor network R A The first voltage reducing unit 1111 is isolated by a resistor to reduce the first live line voltage U A Perform voltage reduction processing to reduce the first live wire voltage U A Isolate from GND.

[0093] The first resistor network R A The first resistor network R comprises at least one resistor. A The input end is connected to the first live wire voltage U of the circuit breaker A , the first resistor network R A The output end of is connected to one end of the first resistor R1 and the first input end of the first operational amplifier follower unit 1112.

[0094] Optionally, continue with reference to Figure 5 , the first resistor network R A includes at least one resistor, wherein if the first resistor network R A Comprising multiple resistors, the first resistor network R A It is composed of multiple resistors in series. The first resistor network R A The input end of the first isolation submodule 111 and the input end of the first step-down unit 1111 are connected to the first live line voltage U of the circuit breaker. A The first resistor network R A The output end of is connected to one end of the first resistor R1 and the first input end of the first operational amplifier follower unit 1112 to convert the stepped-down first live line voltage U A-S The signal is sent to the first input terminal of the first operational amplifier follower unit 1112 .

[0095] The other end of the first resistor R1 is grounded.

[0096] Optionally, continue with reference to Figure 5 The other end of the first resistor R1 is grounded as the second output end of the first step-down unit 1111 and the second output end of the first isolation submodule 111 to isolate the first live line voltage U A and GND, and get the first live wire voltage U after stepping down A-S .

[0097] In this embodiment, a first resistor and a first resistor network are provided in the first step-down unit. The first live line voltage is stepped down through resistor isolation, isolating the first live line voltage from ground to obtain a stepped-down first live line voltage. This stepped-down first live line voltage is then transmitted to the first input terminal of the first op amp follower unit. Resistor isolation isolates the first live line voltage from ground, reducing the risk of electric shock.

[0098] Figure 6 This is a structural diagram of a first anti-aliasing unit of a first isolation submodule of a voltage processing module in a voltage protection circuit of a circuit breaker provided in an embodiment of the present application, as shown in FIG. Figure 6 As shown, the first anti-aliasing unit 1113 includes: a second resistor R2 and a first capacitor C1.

[0099] Optionally, refer to Figure 6 The first anti-aliasing unit 1113 includes a resistor and a capacitor, which are the second resistor R2 and the first capacitor C1. The first anti-aliasing unit 1113 follows the first live line voltage U through the second resistor R2 and the first capacitor C1. A-S Perform filtering to obtain the processed first live wire voltage U A-P .

[0100] One end of the second resistor R2 is connected to the output end of the first operational amplifier follower unit 1112 , and the other end of the second resistor R2 is connected to one end of the first capacitor C1 and the first input end of the voltage sampling module 12 .

[0101] Optionally, continue with reference to Figure 6 One end of the second resistor R2 is used as the input end of the first anti-aliasing unit 1113, and is connected to the output end of the first operational amplifier follower unit 1112 to access the first live line voltage U after voltage following. A-S The other end of the second resistor R2 is connected to one end of the first capacitor C1 and the first input end of the voltage sampling module 12 to convert the processed first live line voltage U A-P The voltage is sent to the first input terminal of the voltage sampling module 12 .

[0102] The other end of the first capacitor C1 is grounded.

[0103] Optionally, continue with reference to Figure 6 The other end of the first capacitor C1 is grounded as the second output end of the first anti-aliasing unit 1113 and the third output end of the first isolation submodule 111 to follow the first live line voltage U A-S Perform filtering to obtain the processed first live wire voltage U A-P .

[0104] In this embodiment, a second resistor and a first capacitor are set in the first anti-aliasing unit, and the first live line voltage after the voltage is followed is filtered by the second resistor and the first capacitor to obtain the processed first live line voltage, and the processed first live line voltage is sent to the first input end of the voltage sampling module, thereby improving the anti-interference ability of the processed first live line voltage.

[0105] As an optional implementation, the voltage sampling module 12 is specifically configured to: A With the neutral voltage U N The differential signal sampling obtains the first voltage effective value and the first sampling signal, and the second live wire voltage U B With the neutral voltage U N The differential signal sampling obtains the second voltage effective value and the second sampling signal, and the third live wire voltage U C With the neutral voltage U N The differential signal is sampled to obtain a third voltage effective value and a third sampling signal, and the first voltage effective value, the second voltage effective value and the third voltage effective value are output through the first output end of the voltage sampling module 12, and the first sampling signal, the second sampling signal and the third sampling signal are output through the second output end of the voltage sampling module 12.

[0106] Optionally, continue with reference to Figure 1 The voltage sampling module 12 receives the processed first live wire voltage U according to the first input terminal of the voltage sampling module 12. A-P And the neutral voltage U after processing N-N , get the first differential signal U A-N , according to the first differential signal U A-N The first voltage effective value and a first sampling signal are obtained by sampling, wherein the first sampling signal is a first AD sampling value.

[0107] Correspondingly, the voltage sampling module 12 receives the processed second live wire voltage U from the second input terminal of the voltage sampling module 12. B-P And the neutral voltage U after processing N-N , get the second differential signal U B-N , according to the second differential signal U B-N The second voltage effective value and a second sampling signal are obtained by sampling, wherein the second sampling signal is a second AD sampling value.

[0108] Correspondingly, the voltage sampling module 12 receives the processed third live wire voltage U from the third input terminal of the voltage sampling module 12. C-P And the neutral voltage U after processing N-N , get the third differential signal U C-N , according to the third differential signal U C-NThe sampling obtains a third voltage effective value and a third sampling signal, wherein the third sampling signal is a third AD sampling value.

[0109] Optionally, the voltage sampling module 12 sends the first voltage effective value, the second voltage effective value, and the third voltage effective value to the first input end of the voltage protection module 13 in a low-speed communication manner through the first output end of the voltage sampling module 12, and sends the first sampling signal, the second sampling signal, and the third sampling signal to the second input end of the voltage protection module 13 in a high-speed communication manner through the second output end of the voltage sampling module 12.

[0110] In this embodiment, the voltage sampling module samples the three differential signals of the three live line voltages and the neutral line voltage to obtain three voltage effective values and three sampling signals, and sends the three voltage effective values to the first input end of the voltage protection module through the first output end of the voltage sampling module in a low-speed communication manner, and sends the three sampling signals to the second input end of the voltage protection module through the second output end of the voltage sampling module in a high-speed communication manner, so that the voltage protection module can quickly perform overvoltage fault judgment and undervoltage fault judgment of the circuit based on the three sampling signals, thereby quickly realizing overvoltage and undervoltage protection of the circuit.

[0111] Figure 7 Another structural diagram of the voltage protection circuit of the circuit breaker provided in the embodiment of the present application is as follows Figure 7 As shown, the voltage protection circuit of the circuit breaker further includes: a power supply module 15.

[0112] Optionally, refer to Figure 7 The voltage protection circuit of the circuit breaker further includes a power supply module 15 , which is connected to the voltage processing module 11 , the voltage sampling module 12 , the voltage protection module and the tripping module 14 respectively.

[0113] The power supply module 15 is respectively connected to the power supply end of the voltage processing module 11 , the power supply end of the voltage sampling module 12 , the power supply end of the voltage protection module 13 , and the power supply end of the tripping module 14 .

[0114] Optionally, continue with reference to Figure 7 The voltage processing module 11, the voltage sampling module 12, the voltage protection module and the tripping module 14 each include a power supply end. The power supply module 15 is respectively connected to the power supply end of the voltage processing module 11, the power supply end of the voltage sampling module 12, the power supply end of the voltage protection module and the power supply end of the tripping module 14. The power supply module 15 is used to power the voltage processing module 11, the voltage sampling module 12, the voltage protection module and the tripping module 14.

[0115] The power module 15 obtains power supply energy through an external fast saturation transformer and an external power supply connected in parallel.

[0116] Optionally, continue with reference to Figure 7 The external speed-saturated transformers are connected in parallel with each other, and the external speed-saturated transformers and the external power supply are connected to the power module 15. The power supply module 15 is provided with power supply energy through two power supply modes: the external power supply and the external speed-saturated transformer.

[0117] In this embodiment, the power module is connected to an external fast-saturation transformer and an external power source in parallel to obtain power. The power module is also connected to the power supply terminals of the voltage processing module, the voltage sampling module, the voltage protection module, and the trip module, respectively, to provide power to the voltage processing module, the voltage sampling module, the voltage protection module, and the trip module.

[0118] Figure 8 Another structural diagram of the voltage protection circuit of the circuit breaker provided in the embodiment of the present application is as follows Figure 8 As shown, the voltage protection circuit of the circuit breaker further includes: a display module 16 .

[0119] Optionally, refer to Figure 8 The voltage protection circuit of the circuit breaker further includes a display module 16, which is used to display data.

[0120] The display module 16 is connected to the voltage protection module 13 .

[0121] Optionally, continue with reference to Figure 8 The display module 16 is connected to the voltage protection module 13 , and the display module 16 receives the data to be displayed sent by the voltage protection module 13 .

[0122] The voltage protection module 13 is further configured to output the data to be displayed to the display module 16 for display.

[0123] Optionally, the voltage protection module 13 sends the first voltage effective value, the second voltage effective value and the third voltage effective value sent by the voltage sampling module 12 as data to be displayed to the display module 16, and the display module 16 displays the first voltage effective value, the second voltage effective value and the third voltage effective value.

[0124] In this embodiment, a display unit is provided in the voltage protection circuit of the circuit breaker, and a display module is connected to the voltage protection module to receive the data to be displayed sent by the voltage protection module and display the data to be displayed. By providing the display module, the data to be displayed can be visualized.

[0125] Figure 9 Another structural diagram of the voltage protection circuit of the circuit breaker provided in the embodiment of the present application is as follows Figure 9 As shown, the voltage protection circuit of the circuit breaker further includes: a communication module 17 .

[0126] Optionally, refer to Figure 9 The voltage protection circuit of the circuit breaker further includes a communication module 17, which is used for external communication.

[0127] One end of the communication module 17 is connected to the voltage protection module 13 , and the other end of the communication module 17 is used for external communication.

[0128] Optionally, continue with reference to Figure 9 One end of the communication module 17 is connected to the voltage protection module 13, and the other end of the communication module 17 is connected to the external device ( Figure 9 For example, the external device may be a host computer.

[0129] The voltage protection module 13 is further configured to output the data to be transmitted to the communication module 17 , and the communication module 17 outputs the data to be transmitted to an external device.

[0130] Optionally, continue with reference to Figure 9 The voltage protection module 13 sends the first voltage effective value, the second voltage effective value and the third voltage effective value sent by the voltage sampling module 12 as data to be transmitted to the communication module 17, and the communication module 17 sends the first voltage effective value, the second voltage effective value and the third voltage effective value to the external device connected to the communication module 17.

[0131] In this embodiment, a communication unit is provided in the voltage protection circuit of the circuit breaker, and the display module is connected to the voltage protection module and the external device respectively to transmit the data to be transmitted from the voltage protection module to the external device. By providing the communication module, external communication is achieved.

[0132] The present application also provides a circuit breaker device, comprising the circuit breaker voltage protection circuit and the circuit breaker module described in the aforementioned embodiment.

[0133] The above is only a specific implementation method of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with this technical field can easily think of changes or replacements within the technical scope disclosed in this application, which should be covered by the protection scope of the present application.

Claims

1. A voltage protection circuit for a circuit breaker, characterized in that: include: Voltage processing module, voltage sampling module, voltage protection module and tripping module; The first input end of the voltage processing module is connected to the first live line voltage of the circuit breaker, the second input end of the voltage processing module is connected to the second live line voltage of the circuit breaker, the third input end of the voltage processing module is connected to the third live line voltage of the circuit breaker, and the fourth input end of the voltage processing module is connected to the neutral line voltage of the circuit breaker. The first output end of the voltage processing module is connected to the first input end of the voltage sampling module, the second output end of the voltage processing module is connected to the second input end of the voltage sampling module, the third output end of the voltage processing module is connected to the third input end of the voltage sampling module, and the fourth output end of the voltage processing module is respectively connected to the first input end, the second input end, and the third input end of the voltage sampling module. The first live line voltage, the second live line voltage, the third live line voltage, and the neutral line voltage are all isolated from the ground in the voltage processing module, and the first live line voltage, the second live line voltage, the third live line voltage, and the neutral line voltage are isolated from each other. The output end of the voltage sampling module is connected to the input end of the voltage protection module, and the voltage sampling module is used to sample the signal output by the voltage processing module and output it to the voltage protection module; The output end of the voltage protection module is connected to the input end of the tripping module, and the voltage protection module is used to send a tripping instruction to the tripping module according to the signal output by the voltage sampling module.

2. The circuit according to claim 1, wherein: The voltage processing module includes: a first isolation submodule, a second isolation submodule, a third isolation submodule and a fourth isolation submodule; The input end of the first isolation submodule is connected to the first live line voltage of the circuit breaker, the first output end of the first isolation submodule is connected to the first input end of the voltage sampling module, and the second output end of the first isolation submodule and the third output end of the first isolation submodule are grounded; The input end of the second isolation submodule is connected to the second live line voltage of the circuit breaker, the first output end of the second isolation submodule is connected to the second input end of the voltage sampling module, and the second output end of the second isolation submodule and the third output end of the second isolation submodule are grounded; The input end of the third isolation submodule is connected to the third live line voltage of the circuit breaker, the first output end of the third isolation submodule is connected to the third input end of the voltage sampling module, and the second output end of the third isolation submodule and the third output end of the second isolation submodule are grounded; The input end of the fourth isolation sub-module is connected to the neutral line voltage of the circuit breaker, the first output end of the fourth isolation sub-module is respectively connected to the first input end of the voltage sampling module, the second input end of the voltage sampling module and the third input end of the voltage sampling module, and the second output end of the fourth isolation sub-module and the third output end of the fourth isolation sub-module are grounded.

3. The circuit according to claim 2, characterized in that The first isolation submodule includes: a first step-down unit, a first operational amplifier follower unit and a first anti-aliasing unit; The input end of the first step-down unit is connected to the first live line voltage of the circuit breaker, the first output end of the first step-down unit is connected to the first input end of the first operational amplifier follower unit, and the second output end of the first step-down unit is grounded; The second input terminal of the first operational amplifier follower unit is connected to the output terminal of the first operational amplifier follower unit, and the output terminal of the first operational amplifier follower unit is connected to the input terminal of the first anti-aliasing unit; A first output terminal of the first anti-aliasing unit is connected to a first input terminal of the voltage sampling module, and a second output terminal of the first anti-aliasing unit is grounded.

4. The circuit according to claim 3, characterized in that The first step-down unit includes: a first resistor network and a first resistor; The first resistor network includes at least one resistor, an input end of the first resistor network is connected to the first live line voltage of the circuit breaker, and an output end of the first resistor network is connected to one end of the first resistor and the first input end of the first operational amplifier follower unit; The other end of the first resistor is grounded.

5. The circuit according to claim 3, characterized in that The first anti-aliasing unit includes: a second resistor and a first capacitor; One end of the second resistor is connected to the output end of the first operational amplifier follower unit, and the other end of the second resistor is connected to one end of the first capacitor and the first input end of the voltage sampling module; The other end of the first capacitor is grounded.

6. The circuit according to claim 1, wherein: The voltage sampling module is specifically used to obtain a first voltage effective value and a first sampling signal based on the differential signal sampling of the first live line voltage and the neutral line voltage, obtain a second voltage effective value and a second sampling signal based on the differential signal sampling of the second live line voltage and the neutral line voltage, and obtain a third voltage effective value and a third sampling signal based on the differential signal sampling of the third live line voltage and the neutral line voltage, and output the first voltage effective value, the second voltage effective value, and the third voltage effective value through the first output end of the voltage sampling module, and output the first sampling signal, the second sampling signal, and the third sampling signal through the second output end of the voltage sampling module.

7. The circuit according to claim 1, wherein: The circuit further includes: a power supply module; The power supply module is respectively connected to the power supply end of the voltage processing module, the power supply end of the voltage sampling module, the power supply end of the voltage protection module and the power supply end of the tripping module; The power supply module obtains power supply energy through an external fast saturation transformer and an external power supply connected in parallel.

8. The circuit according to claim 1, wherein: The circuit further includes: a display module; The display module is connected to the voltage protection module; The voltage protection module is further configured to output the data to be displayed to the display module for display.

9. The circuit according to claim 1, wherein: The circuit further includes: a communication module; One end of the communication module is connected to the voltage protection module, and the other end of the communication module is used to connect to an external device; The voltage protection module is further configured to output the data to be transmitted to the communication module, and the communication module outputs the data to be transmitted to the external device.

10. A circuit breaker device, characterized in that: include: The voltage protection circuit and circuit breaker module of any one of claims 1 to 9.

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