Circuit breaker and power distribution device

Abstract

The utility model provides a circuit breaker and a power distribution device. The circuit breaker comprises a processor, a driving circuit, a release and a disconnection detection circuit. The first end of the processor is electrically connected with the first end of the driving circuit, and the second end is electrically connected with the first end of the disconnection detection circuit; the second end of the driving circuit is electrically connected with the first end of the release, the second end is also used for accessing power supply voltage, and the third end is electrically connected with the second end of the release; the second end of the disconnection detection circuit is electrically connected with the second end of the release, and the third end is used for accessing power supply voltage; the disconnection detection circuit is used for sending a voltage signal to the processor based on the magnitude of the output voltage of the release; and the processor is used for displaying the coil state in the release based on the voltage signal. When a fault line is separated from other lines based on the circuit breaker, the state of the coil in the release can be detected based on the broken line detection circuit, so that the situation that the release cannot work normally due to breakage of the coil in the release can be effectively avoided.

Description

Technical Field

[0001] This application relates to the field of electronic technologies, and particularly to a circuit breaker and a power distribution device. Background Art

[0002] The release is an important execution unit in the circuit breaker. The circuit breaker generates a trip command based on the received control signal. The release executes an action based on the received trip command to make the circuit breaker operate and disconnect the main circuit to protect the safe operation of the power grid.

[0003] The release includes: a permanent magnet, a reaction spring, and a trip coil. When there is no fault in the line where the circuit breaker is located, the controller in the circuit breaker does not issue a trip command. The release does not receive a trip command. At this time, no current passes through the trip coil, so no electromagnetic force is generated in the trip coil. At this time, the release is in the closed position under the action of the permanent magnet and the reaction spring.

[0004] When a fault occurs in the line where the circuit breaker is located, the controller in the circuit breaker issues a trip command and applies power to the trip coil. At this time, current flows through the trip coil, generating an electromagnetic force. This electromagnetic force makes it impossible to maintain balance between the permanent magnet and the reaction spring. The release is in the open position under the action of the electromagnetic force. Thus, the circuit breaker trips and disconnects the connection of the main circuit.

[0005] When the circuit breaker is operating, the probability of a disconnection fault in the trip coil is relatively high and it cannot be detected in time. When a fault occurs in the line where the circuit breaker is located and the release needs to execute a trip command, if the release cannot work properly, it is easy to cause the circuit breaker to fail to operate, unable to cut off the faulty line, and in severe cases, it will cause the circuit breaker to burn out. Utility Model Content

[0006] This application provides a circuit breaker and a power distribution device to solve the problem that the trip coil in the release is disconnected, resulting in the release being unable to trip normally and the circuit breaker being unable to work properly.

[0007] In a first aspect, this application provides a circuit breaker, which includes: a processor, a drive circuit, a release, and a disconnection detection circuit;

[0008] The first end of the processor is electrically connected to the first end of the drive circuit, and the second end is electrically connected to the first end of the disconnection detection circuit; the second end of the drive circuit is electrically connected to the first end of the release, the second end is also used to connect to the power supply voltage, and the third end is electrically connected to the second end of the release; the second end of the disconnection detection circuit is electrically connected to the second end of the release, and the third end is used to connect to the power supply voltage;

[0009] The disconnection detection circuit is used to send a voltage signal to the processor based on the magnitude of the output voltage of the release;

[0010] The processor is configured to display the coil state in the release based on the voltage signal.

[0011] A first aspect of the present application provides a circuit breaker. The circuit breaker includes: a disconnection detection circuit. In this circuit breaker, the disconnection detection circuit detects the magnitude of the voltage output at the output terminal of the release. The disconnection detection circuit generates a corresponding voltage signal based on the detected magnitude of the voltage output at the output terminal, and transmits the voltage signal to the processor. The processor displays the coil state in the release based on whether it issues a trip signal and the voltage signal.

[0012] When the circuit breaker isolates the faulty line from the remaining lines, the state of the coil in the release can be detected based on this disconnection detection circuit, thereby effectively avoiding the abnormal operation of the release caused by the breakage of the coil in the release. Further, it can effectively prevent the problems that the circuit breaker cannot isolate the faulty line and / or the circuit breaker is burned out due to the abnormal operation of the release.

[0013] In a possible design, the disconnection detection circuit includes: a detection circuit and a voltage conversion circuit;

[0014] The first end of the detection circuit is electrically connected to the second end of the release, and the second end is electrically connected to the first end of the voltage conversion circuit;

[0015] The second end of the voltage conversion circuit is electrically connected to the second end of the processor, and the third end of the voltage conversion circuit is used to access the power supply voltage.

[0016] In a possible design, the detection circuit includes: a first resistor, a second resistor, and a first capacitor;

[0017] The first end of the first resistor is electrically connected to the second end of the release, and the second end of the first resistor is electrically connected to the first end of the second resistor; the second end of the second resistor is grounded;

[0018] The first end of the first capacitor is electrically connected between the second end of the detection circuit and the first end of the voltage conversion circuit, and the second end of the first capacitor is grounded.

[0019] In a possible design, the magnitudes of the first resistor and the second resistor are determined based on the parameters of the coil in the release and the power supply voltage.

[0020] In a possible design, the voltage conversion circuit includes: a first amplifier and a third resistor;

[0021] The positive input terminal of the first amplifier is electrically connected between the second end of the first resistor and the first end of the second resistor, the negative input terminal of the first amplifier is used to access the reference voltage, and the output terminal of the first amplifier is electrically connected to the second end of the processor;

[0022] The first end of the third resistor is used to connect to the power supply voltage, and the second end of the third resistor is electrically connected between the output end of the first amplifier and the second end of the processor.

[0023] In a possible design, the disconnection detection circuit further includes: a hysteresis comparison circuit;

[0024] The first end of the hysteresis comparison circuit is electrically connected to the positive input end of the first amplifier, and the second end is electrically connected to the output end of the first amplifier.

[0025] In a possible design, the hysteresis comparison circuit includes: a fourth resistor;

[0026] The first end of the fourth resistor is electrically connected to the positive input end of the first amplifier, and the second end is electrically connected to the output end of the first amplifier.

[0027] In a possible design, the magnitudes of the third resistor and the fourth resistor are determined based on the parameters of the first amplifier.

[0028] In a possible design, the processor includes: a display device for displaying the coil state in the release.

[0029] In a second aspect, the present application provides a power distribution device including a circuit breaker as described in any one of the above.

[0030] For the beneficial effects of the power distribution device provided in the second aspect and each possible design of the second aspect, reference can be made to the beneficial effects brought by the first aspect and each possible implementation manner of the first aspect, which will not be elaborated here. Description of the Drawings

[0031] Figure 1 Is a circuit diagram of a circuit breaker;

[0032] Figure 2 Is a schematic structural diagram of a circuit breaker provided by the present application;

[0033] Figure 3 Is an operating schematic diagram of a circuit breaker provided by the present application;

[0034] Figure 4 Is a schematic structural diagram of a circuit breaker provided by the present application;

[0035] Figure 5 Is a circuit diagram of a circuit breaker provided by the present application. Detailed Embodiments

[0036] In this application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the relationship between associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, or B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single items or plural items. For example, at least one of a alone, b alone, or c alone can represent: a alone, b alone, c alone, the combination of a and b, the combination of a and c, the combination of b and c, or the combination of a, b, and c, where a, b, and c can be single or multiple. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0037] The orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "upper", "lower", "left", "right", "front", "rear", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing this application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this application.

[0038] The terms "connected" and "coupled" should be understood in a broad sense. For example, the "connection" or "coupling" of a circuit structure can refer not only to a physical connection but also to an electrical connection or a signal connection. For example, it can be a direct connection, i.e., a physical connection, or it can be indirectly connected through at least one intermediate element, as long as the circuit is connected. It can also be the internal connection of two elements; a signal connection can be a signal connection through a circuit or can also refer to a signal connection through a media medium, such as radio waves. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] Figure 1 It is a circuit diagram of a circuit breaker. As Figure 1 shown, the circuit breaker includes: a first power supply, a first drive circuit 111, a first processor 110, and a first trip unit 112. The first trip unit 112 includes: a first trip coil. In this circuit breaker, when tripping is required, the first processor 110 generates a trip signal. Based on this trip signal, the first processor 110 controls the first drive circuit 111 to generate an electromagnetic force in the first trip coil, so that the first trip unit 112 trips. Thereby, the circuit breaker operates to cut off the faulty line.

[0040] When the circuit breaker operates, the first processor 110 is only used to control the first drive circuit 111 based on the trip signal, so that the first drive circuit 111 supplies current to the first trip coil. However, the state of the first trip coil is an important factor in ensuring that the first trip coil generates electromagnetic force. The states of the first trip coil include: the coil intact state and the coil open state.

[0041] When the first trip coil is in the open state, the first trip coil cannot generate electromagnetic force, and the first release 112 cannot trip, causing the circuit breaker to malfunction, so that the faulty line cannot be removed from the line where the circuit breaker is located, and in severe cases, it will cause the circuit breaker to burn out.

[0042] For the above reasons, this application proposes a circuit breaker and a power distribution device. A wire break detection circuit is provided in the circuit breaker, which can determine whether the trip coil is in an intact state based on the magnitude of the voltage output by the trip coil, so as to ensure that when a trip instruction is generated in the circuit breaker, the release can trip, that is, the circuit breaker can operate normally.

[0043] Reference Figure 2 , Figure 2 is a schematic structural diagram of a circuit breaker provided by this application. In the first aspect of this application, a circuit breaker is provided, which includes: a processor 1, a drive circuit 2, a release 3, and a wire break detection circuit 4.

[0044] The first end of the processor 1 is electrically connected to the first end of the drive circuit 2, and the second end is electrically connected to the first end of the wire break detection circuit 4; the second end of the drive circuit 2 is electrically connected to the first end of the release 3, and the second end is also used to access the power supply voltage, and the third end is electrically connected to the second end of the release 3; the second end of the wire break detection circuit 4 is electrically connected to the second end of the release, and the third end is used to access the power supply voltage.

[0045] The wire break detection circuit 4 is used to send a voltage signal to the processor 1 based on the magnitude of the output voltage of the release 3.

[0046] The processor 1 is used to display the coil state in the release 3 based on the voltage signal.

[0047] Reference Figure 2 In the first aspect of this application, a circuit breaker is provided. A wire break detection circuit 4 is provided in the circuit breaker. In the circuit breaker, the wire break detection circuit 4 detects the magnitude of the output voltage at the output end of the release 3. The wire break detection circuit 4 generates a corresponding voltage signal based on the detected magnitude of the output voltage at the output end, and transmits the voltage signal to the processor 1. The processor 1 displays the coil state in the release 3 based on whether a trip signal is issued in the processor and the voltage signal.

[0048] Reference Figure 2, when the circuit breaker isolates the faulty line from the remaining lines, the state of the coil in the release 3 can be detected based on the open-circuit detection circuit 4, so that it is possible to effectively avoid the abnormal operation of the release 3 caused by the breakage of the coil in the release 3. Further, it is possible to effectively prevent the problem that the circuit breaker cannot isolate the faulty line and / or the circuit breaker burns out due to the abnormal operation of the release 3.

[0049] In Figure 2 In the circuit breaker shown, the processor 1 can be a microcontroller (Micro Controller Unit) or other electronic device or chip capable of realizing control, storage, and processing functions. The first end of the processor 1 is used to output a trip signal. The second end of the processor 1 is used to input a voltage signal. And the processor 1 is used to generate a trip signal and control the drive circuit 2 based on the trip signal to cause the release 3 to trip. The processor 1 is also used to display the state of the coil in the release 3 based on the voltage signal generated by the open-circuit detection circuit 4.

[0050] Among them, the state of the coil in the release 3 includes: an open state and a good state.

[0051] In Figure 2 In the circuit breaker shown, the first end of the release 3 is the input end of the release 3, and the second end of the release 3 is the output end of the release 3. The second end of the drive circuit 2 is used to connect to the power supply voltage, and the second end of the drive circuit 2 is electrically connected to the input end of the release 3. The input end of the release 3 inputs the power supply voltage, and the release 3 transmits the power supply voltage to the output end of the release 3 based on the coil.

[0052] If the coil in the release 3 is in a good state, the power supply voltage is output to the output end of the release 3 based on the coil, so that the magnitude of the output voltage at the output end of the release 3 is the same as the magnitude of the power supply voltage. If the coil in the release 3 is in an open state, the coil in the release 3 is open, and the power supply voltage cannot be output to the output end of the release 3 through the coil, so that the magnitude of the output voltage at the output end of the release 3 is zero.

[0053] In Figure 2 In the circuit breaker shown, when the open-circuit detection circuit 4 detects that the output voltage at the output end of the release 3 is zero, the open-circuit detection circuit 4 generates a first level signal and sends the first level signal to the processor 1. When the open-circuit detection circuit 4 detects that the output voltage at the output end of the release 3 is the power supply voltage, the open-circuit detection circuit 4 generates a second level signal. At this time, the processor 1 displays normal to indicate that the coil in the release 3 is in a good state.

[0054] In addition, after the processor 1 sends a tripping instruction, the trip unit 3 trips, causing the voltage at the output end of the trip unit 3 to be constantly zero. At this time, after the open-circuit detection circuit 4 sends a first-level signal to the processor 1, the processor 1 needs to determine whether to send a tripping signal. If a tripping signal is sent, the processor 1 displays normal. If no tripping signal is sent, the processor 1 displays a warning message to indicate that the coil in the trip unit 3 is in an open state.

[0055] Among them, the magnitude of the first-level signal is greater than that of the second-level signal. The first-level signal is a high-level signal, and the second-level signal is a low-level signal.

[0056] Figure 2 The circuit breaker shown further includes: a power supply 5. The second end of the drive circuit 2 and the third end of the open-circuit detection circuit 4 are both electrically connected to the power supply 5. The magnitude of the power supply 5 is set based on specific requirements.

[0057] In Figure 2 In the circuit breaker shown, the open-circuit detection circuit 4 detects the magnitude of the output voltage at the output end of the trip unit 3. The open-circuit detection circuit 4 generates a corresponding level signal based on the detected magnitude of the output voltage and outputs the level signal to the processor 1. The processor 1 displays the corresponding coil state based on the level signal.

[0058] Figure 3 This is a schematic diagram of the operation of a circuit breaker provided for itself. As Figure 3 shown, the operation steps of the circuit breaker of the present application include: Step S1: The open-circuit detection circuit 4 detects the magnitude of the output voltage at the output end of the trip unit 3; Step S2: The open-circuit detection circuit 4 generates a first-level signal or a second-level signal based on the magnitude of the output voltage at the output end of the trip unit 3 and transmits the first-level signal or the second-level signal to the processor 1; Step S3: The processor 1 determines whether to send a tripping signal; Step S4: The processor 1 displays normal; Step S5: The processor 1 displays a warning message.

[0059] Among them, during the operation of the circuit breaker, before executing step S3, if the open-circuit detection circuit 4 transmits a second-level signal to the processor 1, directly execute step S4 without executing step S3. If the open-circuit detection circuit 4 transmits a first-level signal to the processor 1, after executing step S2, execute step S3. When executing step S3, if the processor 1 sends a tripping signal, the processor 1 executes step S4. If the processor 1 does not send a tripping signal, the processor 1 executes step S5.

[0060] Refer to Figure 4 , Figure 4 This is a schematic diagram of the structure of a circuit breaker provided for the present application. In a possible design, the open-circuit detection circuit 4 includes: a detection circuit 41 and a voltage conversion circuit 42;

[0061] The first end of the detection circuit 41 is electrically connected to the second end of the trip 3, and the second end is electrically connected to the first end of the voltage conversion circuit 42;

[0062] The second end of the voltage conversion circuit 42 is electrically connected to the second end of the processor 1, and the third end of the voltage conversion circuit 42 is used to access the power supply voltage.

[0063] In Figure 4 In the circuit breaker shown, the open - circuit detection circuit 4 includes: a detection circuit 41 and a voltage conversion circuit 42. The detection circuit 41 is used to access the output voltage output by the output end of the trip 3, and divides the output voltage of the output end of the trip 3, so that the output voltage is reduced.

[0064] The voltage conversion circuit 42 is used to convert the voltage output by the detection circuit 41, and convert the voltage into a level signal, so that the level signal output by the voltage conversion circuit 42 matches the processor 1.

[0065] Reference Figure 5 , Figure 5 FIG. is a circuit diagram of a circuit breaker provided by the present application. In a possible design, the detection circuit 41 includes: a first resistor R1, a second resistor R2, and a first capacitor C1;

[0066] The first end of the first resistor R1 is electrically connected to the second end of the trip 3, and the second end of the first resistor R1 is electrically connected to the first end of the second resistor R2; the second end of the second resistor R2 is grounded;

[0067] The first end of the first capacitor C1 is electrically connected between the second end of the detection circuit 41 and the first end of the voltage conversion circuit 42, and the second end of the first capacitor C1 is grounded.

[0068] In Figure 5 In the circuit breaker shown, the first end of the first resistor R1 is the positive extreme of the first resistor R1, and the second end of the first resistor R1 is the negative extreme of the first resistor R1. The first end of the second resistor R2 is the positive extreme of the second resistor R2, and the second end of the second resistor R2 is the negative extreme of the second resistor R2. The first end of the first capacitor C1 is the positive extreme of the first capacitor C1, and the second end of the first capacitor C1 is the negative extreme of the first capacitor C1.

[0069] In Figure 5 In the circuit breaker shown, the first resistor R1 and the second resistor R2 are used to divide the output voltage of the output end of the trip 3. The first capacitor C1 is used to perform anti - interference processing on the voltage after being divided by the first resistor R1 and the second resistor R2 to prevent misjudgment.

[0070] In Figure 5In the circuit breaker shown, in a possible design, the magnitudes of the first resistor R1 and the second resistor R2 are determined based on the parameters of the coil 31 in the release 3 and the power supply voltage.

[0071] In Figure 5 In the circuit breaker shown, the first resistor R1 and the second resistor R2 are used to divide the output voltage at the output terminal of the connected release 3. Therefore, the magnitudes of the first resistor R1 and the second resistor R2 need to be determined based on the magnitudes of the parameters of the coil 31 in the release 3 and the power supply voltage.

[0072] Referring Figure 5 , in a possible design, the voltage conversion circuit 42 includes: a first amplifier 6 and a third resistor R3;

[0073] The positive input terminal A1 of the first amplifier 6 is electrically connected between the second terminal of the first resistor R1 and the first terminal of the second resistor R2. The negative input terminal A2 of the first amplifier 6 is used to connect to a reference voltage. The output terminal A3 of the first amplifier 6 is electrically connected to the second terminal of the processor 1;

[0074] The first terminal A4 of the third resistor R3 is used to connect to the power supply voltage. The second terminal of the third resistor R3 is electrically connected between the output terminal A4 of the first amplifier 6 and the second terminal of the processor 1.

[0075] In Figure 5 In the circuit breaker shown, the reference voltage connected to the negative input terminal A2 of the first amplifier 6 is determined based on requirements. This reference voltage is used to compare with the voltage input at the positive input terminal A1. In a possible design, the reference voltage connected to the negative input terminal A2 of the first amplifier 6 can be the power supply voltage. The first terminal A4 of the third resistor R3 is the positive extreme of the third resistor R3, and the second terminal of the third resistor R3 is the negative extreme of the third resistor R3.

[0076] In Figure 5 In the circuit breaker shown, the first amplifier 6 is used to convert the voltage output by the detection circuit 41 to convert the voltage output by the detection circuit 41 into a voltage signal matching the second terminal of the processor 1. The third resistor R3 is used to perform a pull-up process on the level signal output by the first amplifier 6, that is, the output level signal can be pulled high.

[0077] In Figure 5 In the circuit breaker shown, the first amplifier 6 compares the voltage input at the positive input terminal A1 and the voltage input at the negative input terminal A2. When the voltage input at the positive input terminal A1 is greater than the voltage input at the negative input terminal A2, the first amplifier 6 outputs a first level signal, that is, a high level signal. When the voltage input at the positive input terminal A1 is less than the voltage input at the negative input terminal A2, the first amplifier 6 outputs a second level signal, that is, a low level signal.

[0078] Reference Figure 5 , in a possible design, the disconnection detection circuit 4 further includes: a hysteresis comparison circuit;

[0079] The first end of the hysteresis comparison circuit is electrically connected to the positive input terminal A1 of the first amplifier 6, and the second end is electrically connected to the output terminal A3 of the first amplifier 6.

[0080] In Figure 5 the shown circuit breaker, the disconnection detection circuit 4 further includes: a hysteresis comparison circuit. The hysteresis comparison circuit is used to accelerate the voltage conversion speed of the first amplifier 6. The first end of the hysteresis comparison circuit is the input end of the hysteresis comparison circuit. The second end of the hysteresis comparison circuit is the output end of the hysteresis comparison circuit.

[0081] In a possible design, the hysteresis comparison circuit includes: a fourth resistor R4;

[0082] The first end of the fourth resistor R4 is electrically connected to the positive input terminal A1 of the first amplifier 6, and the second end is electrically connected to the output terminal A3 of the first amplifier 6.

[0083] In Figure 5 the shown circuit breaker, the hysteresis comparison circuit can be the fourth resistor R4. The hysteresis circuit is used to accelerate the voltage conversion efficiency of the first amplifier 6. That is, when the output terminal A3 of the first amplifier 6 outputs a high level, the fourth resistor R4 can make the magnitude of the high level larger. If the output terminal A3 of the first amplifier 6 outputs a low level, the fourth resistor R4 can make the magnitude of the low level smaller.

[0084] In a possible design, the magnitudes of the third resistor R3 and the fourth resistor R4 are determined based on the parameters of the first amplifier 6.

[0085] In a possible design of the circuit breaker, the fourth resistor R4 is used to accelerate the voltage conversion efficiency of the first amplifier 6. The third resistor R3 is used to pull down the magnitude of the level output by the first amplifier 6. Thus, the magnitudes of the third resistor R3 and the fourth resistor R4 are set based on the magnitudes of the parameters of the first amplifier 6.

[0086] In a possible design, the processor 1 includes: a display device for displaying the state of the coil 31 in the release 3.

[0087] In a possible design of the circuit breaker, the processor 1 includes a display device. The display device is used to display normal or warning information based on the first level signal or the second level signal accessed at the second end of the processor 1.

[0088] In Figure 5In the circuit breaker shown, the drive circuit 2 includes: a second amplifier 7, a fifth resistor R5, a sixth resistor R6, a second capacitor C2, a third capacitor C3, a first transistor Q1, and a diode D. The positive input terminal of the second amplifier 7 is electrically connected to the first terminal of the processor 1.

[0089] The negative input terminal of the second amplifier 7 is used to input a first reference voltage. The third terminal B3 of the second amplifier 7 is used to connect to a power supply voltage. The output terminal of the second amplifier 7 is electrically connected to the gate of the first transistor Q1.

[0090] The positive terminal B2 of the fifth resistor R5 is used to connect to a power supply voltage. The negative terminal of the fifth resistor R5 is electrically connected between the output terminal of the second amplifier 7 and the gate of the first transistor Q1. The positive terminal of the sixth resistor R6 is electrically connected between the output terminal of the second amplifier 7 and the gate of the first transistor Q1. The negative terminal of the sixth resistor R6 is grounded.

[0091] The positive terminal of the second capacitor C2 is electrically connected between the output terminal of the second amplifier 7 and the gate of the first transistor Q1. The negative terminal of the second capacitor C2 is grounded. The source of the first transistor Q1 is grounded, and the drain of the first transistor Q1 is electrically connected to the negative electrode of the diode D. The positive electrode B1 of the diode D is connected to a power supply voltage. The positive terminal of the third capacitor C3 is connected to a power supply voltage, and the negative terminal of the third capacitor C3 is grounded. Among them, the output terminal of the trip unit 3 is electrically connected between the drain of the first transistor Q1 and the negative electrode of the diode D.

[0092] In a second aspect, the present application provides a power distribution device including a circuit breaker as described in any one of the above.

[0093] For the beneficial effects of the power distribution device provided in the above second aspect and each possible design of the above second aspect, reference can be made to the beneficial effects brought about by the above first aspect and each possible implementation manner of the first aspect, which will not be elaborated here.

Claims

1. A circuit breaker, characterized in that, The circuit breaker includes: a processor, a drive circuit, a trip device, and a wire break detection circuit; A first end of the processor is electrically connected to a first end of the drive circuit, and a second end of the processor is electrically connected to a first end of the wire break detection circuit; a second end of the drive circuit is electrically connected to a first end of the trip device, and the second end is further configured to be connected to a power supply voltage, and a third end of the drive circuit is electrically connected to a second end of the trip device; a second end of the wire break detection circuit is electrically connected to the second end of the trip device, and a third end of the wire break detection circuit is configured to be connected to the power supply voltage; The wire break detection circuit is configured to send a voltage signal to the processor based on a magnitude of an output voltage of the trip device; The processor is configured to display a coil state in the trip device based on the voltage signal.

2. The circuit breaker according to claim 1, wherein The wire break detection circuit includes: a detection circuit and a voltage conversion circuit; A first end of the detection circuit is electrically connected to the second end of the trip device, and a second end of the detection circuit is electrically connected to a first end of the voltage conversion circuit; A second end of the voltage conversion circuit is electrically connected to the second end of the processor, and a third end of the voltage conversion circuit is configured to be connected to the power supply voltage.

3. The circuit breaker according to claim 2, characterized in that, The detection circuit includes: a first resistor, a second resistor, and a first capacitor; A first end of the first resistor is electrically connected to the second end of the trip device, and a second end of the first resistor is electrically connected to a first end of the second resistor; a second end of the second resistor is grounded; A first end of the first capacitor is electrically connected between the second end of the detection circuit and the first end of the voltage conversion circuit, and a second end of the first capacitor is grounded.

4. The circuit breaker according to claim 3, characterized in that, The magnitudes of the first resistor and the second resistor are determined based on parameters of a coil in the trip device and the power supply voltage.

5. The circuit breaker according to claim 3, characterized in that, The voltage conversion circuit includes: a first amplifier and a third resistor; A positive input terminal of the first amplifier is electrically connected between the second end of the first resistor and the first end of the second resistor, a negative input terminal of the first amplifier is configured to be connected to a reference voltage, and an output terminal of the first amplifier is electrically connected to the second end of the processor; A first end of the third resistor is configured to be connected to the power supply voltage, and a second end of the third resistor is electrically connected between the output terminal of the first amplifier and the second end of the processor.

6. The circuit breaker according to claim 5, characterized in that, The wire break detection circuit further includes: a hysteresis comparison circuit; A first end of the hysteresis comparison circuit is electrically connected to the positive input terminal of the first amplifier, and a second end of the hysteresis comparison circuit is electrically connected to the output terminal of the first amplifier.

7. The circuit breaker according to claim 6, characterized in that, The hysteresis comparison circuit includes: a fourth resistor; A first end of the fourth resistor is electrically connected to the positive input terminal of the first amplifier, and a second end of the fourth resistor is electrically connected to the output terminal of the first amplifier.

8. The circuit breaker according to claim 7, characterized in that, The magnitudes of the third resistor and the fourth resistor are determined based on parameters of the first amplifier.

9. The circuit breaker according to claim 1, characterized in that, The processor includes: a display device configured to display a coil state in the trip device.

10. A power distribution device, characterized in that, A circuit breaker according to any one of claims 1-9 is included.

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