Tripping control circuit of circuit breaker and circuit breaker

Abstract

The utility model provides a kind of tripping control circuit of circuit breaker and circuit breaker, the tripping control circuit of circuit breaker includes filter capacitor, power module, main control module, drive module and detection module;Filter capacitor is electrically connected with main control module by power module and is used to be electrically connected with power supply, filter capacitor and drive module are used to be connected in series with tripping device;Main control module is also electrically connected with drive module and is used to be electrically connected with power supply by detection module, for when detecting that power supply stops power supply, filter capacitor is driven to tripping device by drive module control to trip.The utility model has realized the purpose of power failure trip under the premise that battery or super capacitor is not separately provided, simplify circuit structure and reduce circuit volume, and there is no related defect of battery and super capacitor.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a circuit breaker tripping control circuit and a circuit breaker. Background Technology

[0002] With the development of circuit breaker-related technologies, circuit breakers have begun to adopt electronic tripping technology and introduce energy storage components such as batteries or large-capacity supercapacitors as backup power sources for the tripping device.

[0003] Current circuit breaker solutions achieve the goal of tripping even during power outages, but energy storage components such as batteries or supercapacitors need to be designed independently, resulting in complex circuit structures and increased size. In addition, batteries suffer from self-discharge losses and limited lifespan, while supercapacitors suffer from leakage current and insufficient long-term energy storage stability, ultimately leading to poor stability of backup power solutions. Utility Model Content

[0004] In view of the shortcomings of the existing technology, this utility model provides a tripping control circuit for a circuit breaker and a circuit breaker.

[0005] In one embodiment, the present invention provides a tripping control circuit for a circuit breaker, the tripping control circuit for the circuit breaker including a filter capacitor, a power supply module, a main control module, a drive module and a detection module;

[0006] The filter capacitor is electrically connected to the main control module via the power module and is also used for electrical connection to the power supply. The filter capacitor and the drive module are connected in series with the trip unit.

[0007] The main control module is also electrically connected to the drive module and is used to connect to the power supply through the detection module. When the power supply stops supplying power, the drive module controls the filter capacitor to trip the trip unit.

[0008] In one embodiment, the drive module includes a switching unit and a current-limiting resistor;

[0009] The first and second access terminals of the switching unit are connected in series with the filter capacitor and are used to connect in series with the trip unit. The controlled terminal of the switching unit is electrically connected to the main control module. The current limiting resistor is electrically connected to the first and second access terminals of the switching unit, respectively.

[0010] The main control module is used to control the switching unit to turn on when the power supply stops.

[0011] In one embodiment, the switching unit includes a first NMOS transistor and a drive amplifier subunit;

[0012] The drain of the first NMOS transistor is electrically connected to the first terminal of the trip unit, the filter capacitor is electrically connected to the second terminal of the trip unit, the source of the first NMOS transistor is grounded, the gate of the first NMOS transistor is electrically connected to the main control module through the drive amplifier subunit, and the current limiting resistor is electrically connected to the drain and source of the first NMOS transistor respectively.

[0013] In one embodiment, the drive amplifier subunit includes an NPN transistor, a PNP transistor, and a pull-up resistor;

[0014] The base of the NPN transistor is electrically connected to the main control module. The collector of the NPN transistor is electrically connected to the base of the PNP transistor and is used to connect to the emitter of the PNP transistor through a pull-up resistor. The emitter of the NPN transistor is used for grounding. The emitter of the PNP transistor is also used to connect to the operating voltage. The collector of the PNP transistor is electrically connected to the gate of the first NMOS transistor.

[0015] In one embodiment, the power module includes a transformer and a switching power supply control unit, wherein the transformer includes a primary side, a first secondary side and a second secondary side;

[0016] The input terminal of the primary side is electrically connected to the filter capacitor, and the output terminal of the primary side is grounded through the switching power supply control unit;

[0017] The output terminal of the first secondary side is electrically connected to the power supply terminal of the switching power supply control unit, and the output terminal of the second secondary side is electrically connected to the power supply terminal of the main control module. The input terminals of the first and second secondary sides are respectively used for grounding.

[0018] In one embodiment, the circuit breaker further includes an overvoltage protection module;

[0019] The filter capacitor is used to electrically connect to the power supply through the overvoltage protection module;

[0020] The overvoltage protection module is used to disconnect the line between the power supply and the filter capacitor when an overvoltage occurs in the power supply.

[0021] In one embodiment, the overvoltage protection module includes a first voltage divider resistor, a second NMOS transistor, and a first Zener diode;

[0022] The drain of the second NMOS transistor is electrically connected to the cathode of the first Zener diode and the gate of the second NMOS transistor through the first voltage divider resistor, and is used to connect to the power supply. The source of the second NMOS transistor is electrically connected to the filter capacitor, and the anode of the first Zener diode is used to ground.

[0023] In one embodiment, the overvoltage protection module further includes a second Zener diode;

[0024] The cathode of the second Zener diode is electrically connected to the gate of the second NMOS transistor, and the anode of the second Zener diode is electrically connected to the source of the second NMOS transistor.

[0025] In one embodiment, the detection module includes a second voltage divider resistor, a third voltage divider resistor, and an operational amplifier;

[0026] The first end of the third voltage divider resistor is electrically connected to the first input terminal of the operational amplifier and is used to connect to the power supply through the second voltage divider resistor. The second end of the third voltage divider resistor is used to ground. The second input terminal of the operational amplifier is used to connect to the reference voltage. The output terminal of the operational amplifier is electrically connected to the main control module.

[0027] Secondly, in one embodiment, the present invention provides a circuit breaker, the circuit breaker including a trip unit and a trip control circuit of the circuit breaker in any of the above embodiments.

[0028] By utilizing the tripping control circuit and circuit breaker described above, and reusing the filter capacitor at the front end of the power supply module, the filter capacitor performs filtering function and supplies power to the main control module through the power supply module when the power supply is normal. During this process, the filter capacitor stores energy. When the power supply stops, the main control module can detect this state through the detection module, thereby controlling the drive module to transfer the energy on the filter capacitor to the trip unit to achieve the tripping operation of the trip unit. This utility model achieves the purpose of power outage tripping without the need for a separate battery or supercapacitor, simplifies the circuit structure, reduces the circuit size, and avoids the defects associated with batteries and supercapacitors. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the circuit breaker in one embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram of the specific circuit of the driving module in one embodiment of the present invention;

[0032] Figure 3 This is a schematic diagram of the power module in one embodiment of the present invention.

[0033] Figure 4 This is a schematic diagram of the structure of the circuit breaker further including an overvoltage protection module in one embodiment of the present invention;

[0034] Figure 5 This is a schematic diagram of the overvoltage protection module in one embodiment of the present invention.

[0035] Figure 6 This is a schematic diagram showing the overvoltage protection module further including a second Zener diode in one embodiment of the present invention.

[0036] Figure 7 This is a schematic diagram of the detection module in one embodiment of the present invention. Detailed Implementation

[0037] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0038] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "a plurality of" means two or more, unless otherwise explicitly specified. In this application, the term "exemplary" is used to mean "used as an example, illustration, or description." Any embodiment described as "exemplary" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to implement and use this invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that this invention can be implemented without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of this invention with unnecessary detail. Therefore, this invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0039] Firstly, such as Figure 1 As shown, in one embodiment, the present invention provides a tripping control circuit for a circuit breaker, which includes a filter capacitor CE1, a power supply module, a main control module, a drive module, and a detection module.

[0040] The filter capacitor CE1 is electrically connected to the main control module via the power module and is also used for electrical connection to the power supply. The filter capacitor CE1 and the drive module are connected in series with the trip unit.

[0041] The power supply is used to output DC power. The power supply can include only a DC power source, or it can include both an AC power source and a rectifier module. When the power supply includes both an AC power source and a rectifier module, the AC power output from the AC power source is rectified by the rectifier module to output DC power to the filter capacitor CE1.

[0042] The filter capacitor CE1 is used to filter the DC power output from the power supply, thereby making the waveform of the DC power output to the power module smoother. Specifically, the filter capacitor CE1 stores energy based on the input DC power. After energy storage is completed, it can replenish energy when the amplitude of the DC power decreases, so as to maintain the relative stability of the amplitude.

[0043] The power supply module is mainly used to regulate the voltage of the incoming DC power to meet the power supply requirements of the main control module.

[0044] The main control module is also electrically connected to the drive module and is used to connect to the power supply through the detection module. When the power supply stops supplying power, the drive module controls the filter capacitor CE1 to trip the trip unit.

[0045] The detection module can detect both voltage and current. The main control module uses feedback from the detection module to determine if the power supply has stopped. When a power supply stoppage is detected, the main control module controls the drive module to activate the current loop of the trip unit, thereby powering on the trip unit and initiating its tripping operation.

[0046] Understandably, the main control module usually has corresponding energy storage devices inside, which enable it to continue working for a period of time, such as 200-300ms, after the power supply stops. This allows the main control module to detect that the power supply is in a stopped state through the detection module when the power supply stops.

[0047] As a supplement, the filter capacitor CE1, as a front-end filtering device of the power module, needs to have a large capacity so that the energy stored in it during the filtering process can drive the trip unit to perform a tripping operation. Specifically, the filter capacitor CE1 can be a solid-state capacitor.

[0048] The main control module includes, but is not limited to, SOC (System on Chip), MCU (Microcontroller Unit), and CPU (Central Processing Unit). Different types of main control modules have different power requirements, and the power module can be configured according to actual needs.

[0049] By utilizing the tripping control circuit of the aforementioned circuit breaker, the filter capacitor at the front end of the power supply module is reused. When the power supply is operating normally, the filter capacitor performs its filtering function and supplies power to the main control module through the power supply module. During this process, the filter capacitor stores energy. When the power supply stops, the main control module can detect this state through the detection module, thereby controlling the drive module to transfer the energy from the filter capacitor to the trip unit to achieve the tripping operation of the trip unit. This invention achieves the purpose of power outage tripping without the need for a separate battery or supercapacitor, simplifies the circuit structure, reduces the circuit size, and avoids the defects associated with batteries and supercapacitors.

[0050] like Figure 2 As shown, in one embodiment, the driving module includes a switching unit and a current-limiting resistor R17. The switching unit includes a first NMOS transistor Q1 and a driving amplification subunit. The driving amplification subunit includes an NPN transistor Q2, a PNP transistor Q3, and a pull-up resistor R13.

[0051] The drain of the first NMOS transistor Q1 is electrically connected to the first terminal of the trip unit, the filter capacitor CE1 is electrically connected to the second terminal of the trip unit, the source of the first NMOS transistor Q1 is grounded, the gate of the first NMOS transistor Q1 is electrically connected to the collector of the PNP transistor Q3 through resistors R15 and R16, and the current limiting resistor R17 is electrically connected to the drain and source of the first NMOS transistor Q1 respectively.

[0052] When the first NMOS transistor Q1 is turned off, the filter capacitor CE1 is grounded through the trip unit and the current-limiting resistor R17, so that there is only a small current in the trip unit, thus maintaining a low-power standby state; when the first NMOS transistor Q1 is turned on, the first NMOS transistor short-circuits the current-limiting resistor R17, and the filter capacitor CE1 is grounded through the trip unit and the first NMOS transistor Q1, so that there is a large current in the trip unit, thus powering on to perform the tripping operation.

[0053] Among them, the current-limiting resistor R17 can be a variable resistor, which can adjust the degree of current limiting to more flexibly adjust the standby state of the trip unit.

[0054] The base of NPN transistor Q2 is electrically connected to the main control module through resistors R11 and R12. The collector of NPN transistor Q2 is electrically connected to the base of PNP transistor Q3 through resistor R14 and is used to connect to the emitter of PNP transistor Q3 through pull-up resistor R13. The emitter of NPN transistor Q2 is used for grounding, and the emitter of PNP transistor Q3 is also used to connect to the operating voltage (such as 12V).

[0055] When the power supply stops, the main control module outputs a high-level control signal, turning on NPN transistor Q2 and PNP transistor Q3. This allows the 12V operating voltage to be output to the gate of the first NMOS transistor Q1 through resistors R15 and R16, thus driving Q1 to turn on. Conversely, when the power supply is operating normally, the main control module outputs a low-level control signal, turning off NPN transistor Q2 and PNP transistor Q3. This prevents the 12V operating voltage from being output to the gate of the first NMOS transistor Q1 through resistors R15 and R16, thus turning Q1 off.

[0056] In this embodiment, since the first NMOS transistor Q1 is connected in series in the current loop of the trip unit, and considering the large current required for the trip unit to perform the tripping operation, a high-power MOS transistor can be used as the first NMOS transistor Q1 to improve reliability. When a high-power MOS transistor is used for the first NMOS transistor Q1, the required drive voltage is also large. The voltage amplitude of the control signal directly output by the main control module cannot meet the drive requirements of the first NMOS transistor Q1. Therefore, a drive amplification subunit mainly composed of an NPN transistor Q2, a PNP transistor Q3, and a pull-up resistor R13 is further added.

[0057] In other embodiments, other circuit topologies can be used to implement the driving amplifier subunit; similarly, in other embodiments, other circuit topologies can be used to implement the switching unit.

[0058] like Figure 3 As shown, in one embodiment, the power module includes a transformer T1 and a switching power supply control unit (such as a switching power supply chip U1). The transformer T1 includes a primary side N1, a first secondary side N2, and a second secondary side N3.

[0059] The input terminal of the primary side N1 (i.e., pin 1 of transformer T1) is electrically connected to the filter capacitor CE1, the output terminal of the primary side N1 (i.e., pin 2 of transformer T1) is electrically connected to the input terminal SW of the switching power supply chip U1, and the output terminal CS of the switching power supply chip U1 is grounded through resistor R22.

[0060] The output terminal of the first secondary side N2 (i.e., pin 5 of transformer T1) is electrically connected to the power supply terminal VDD of the switching power supply chip U1 through diode D1, resistor R21, capacitor C1 and capacitor C2. The output terminal of the second secondary side N3 (i.e., pin 10 of transformer T1) is electrically connected to the power supply terminal of the main control module through diode D2, capacitor C3, resistor R23 and capacitor CE2. The input terminals of the first secondary side N2 and the second secondary side N3 are respectively used for grounding.

[0061] The switching power supply chip U1 contains a corresponding switching transistor that controls the connection between the input terminal SW and the output terminal CS of the switching power supply chip U1, thereby controlling the current flow on the primary side N1 and ultimately controlling the voltage regulation of the transformer T1 by means of the duty cycle.

[0062] Specifically, under the control of the switching power supply chip U1, a pulse current is generated on the primary side N1. Based on the principle of electromagnetic induction, pulse currents are also generated on the first secondary side N2 and the second secondary side N3, with the amplitude depending on the turns ratio between the primary and secondary sides. The pulse current on the first secondary side N2 is used to power the switching power supply chip U1 so that it can work normally, while the pulse current on the second secondary side N3 is used to power the main control module.

[0063] This embodiment uses a switching power supply, which not only achieves voltage regulation but also provides physical electrical isolation, ensuring the safety of downstream devices.

[0064] like Figure 4 As shown, in one embodiment, the circuit breaker also includes an overvoltage protection module.

[0065] The filter capacitor CE1 is used to electrically connect to the power supply through the overvoltage protection module.

[0066] The overvoltage protection module is used to disconnect the line between the power supply and the filter capacitor CE1 when an overvoltage occurs in the power supply, so as to provide overvoltage protection for downstream devices such as the filter capacitor CE.

[0067] like Figure 5 As shown, in one embodiment, the overvoltage protection module includes a first voltage divider resistor (including resistors R32, R33 and R34), a second NMOS transistor Q4 and a first Zener diode (including Zener diodes VD1 and VD2).

[0068] Resistors R32, R33, and R34 are connected in series. The drain of the second NMOS transistor Q4 is electrically connected to the cathode of Zener diode VD1 through the first voltage divider resistor composed of resistors R32, R33, and R34 and resistor R35. The drain is also electrically connected to the gate of the second NMOS transistor Q4 through the first voltage divider resistor composed of resistors R32, R33, and R34 and is used to connect to the power supply through resistor R31. The source of the second NMOS transistor Q4 is electrically connected to the filter capacitor CE1. The anode of Zener diode VD1 is electrically connected to the cathode of Zener diode VD2. The anode of Zener diode VD2 is used for grounding.

[0069] When the power supply is normal, both Zener diodes VD1 and VD2 are turned off, and the second NMOS transistor Q4 is turned on. The line between the power supply and the filter capacitor CE1 is connected, and the power output from the power supply can be transmitted to the subsequent filter capacitor CE1 and the power module. Conversely, when the power supply experiences overvoltage, both Zener diodes VD1 and VD2 are turned on. At this time, the gate voltage of the second NMOS transistor Q4 is pulled low, and the second NMOS transistor Q4 is turned off. The line between the power supply and the filter capacitor CE1 is disconnected, and the power output from the power supply cannot be transmitted to the subsequent filter capacitor CE1 and the power module.

[0070] like Figure 6 As shown, in one embodiment, the overvoltage protection module further includes a second Zener diode (including Zener diode VD3).

[0071] The cathode of the second Zener diode VD3 is electrically connected to the gate of the second NMOS transistor Q4, and the anode of the second Zener diode VD3 is electrically connected to the source of the second NMOS transistor Q4.

[0072] The gate voltage of the second NMOS transistor Q4 needs to be controlled within a safe range. Exceeding this range can easily damage the second NMOS transistor Q4. The first Zener diode, composed of Zener diodes VD1 and VD2, can turn off the second NMOS transistor Q4 when an overvoltage occurs in the power supply. This not only protects the downstream filter capacitor CE1 and the power module, but also protects the second NMOS transistor Q4 itself. However, the trigger amplitude of overvoltage protection is usually high. When the voltage output by the power supply is below the trigger amplitude of overvoltage protection, it may still exceed the safe range of the gate voltage of the second NMOS transistor Q4.

[0073] Therefore, in this embodiment, a second Zener diode composed of Zener diode VD3 is added, which can conduct when the voltage output by the power supply is below the trigger amplitude of the overvoltage protection but greater than the safe range of the gate voltage of the second NMOS transistor Q4, so as to reduce the gate voltage of the second NMOS transistor Q4 and further protect the second NMOS transistor Q4.

[0074] like Figure 7 As shown, in one embodiment, the detection module includes a second voltage divider resistor (including resistors R41, R42 and R43), a third voltage divider resistor (including resistor R46) and an operational amplifier U2.

[0075] Resistors R41, R42, and R43 are connected in series. The first end of resistor R46 is electrically connected to the first input terminal (such as the inverting input terminal) of op-amp U2 through resistor R44, and to the first end of capacitor C4. It is also used to connect to the power supply through resistors R41, R42, and R43. The second end of resistor R46 and the second end of capacitor C4 are used for grounding. The second input terminal (such as the inverting input terminal) of op-amp U2 is used to connect to the reference voltage (such as the +3V operating voltage) through resistors R45 and R47. The output terminal of op-amp U2 is electrically connected to the main control module through resistor R48.

[0076] As mentioned in the above embodiments, the power supply may include only a DC power supply, or it may include both an AC power supply and a rectifier module. In this embodiment, taking the power supply including both an AC power supply and a rectifier module as an example, the inverting input terminal of operational amplifier U2 is used to electrically connect to the AC power supply in the power supply.

[0077] Specifically, when the AC power supply stops supplying power, the voltage connected to the inverting input of operational amplifier U2 is zero. At this time, the voltage at the inverting input of operational amplifier U2 is less than the voltage at the non-inverting input, causing the output of operational amplifier U2 to output a high-level detection signal to the main control module. It's important to note that the AC waveform output from the AC power supply is a continuously zero-crossing sine wave. Therefore, when the AC power supply is operating normally, the voltage connected to the inverting input of operational amplifier U2 will be less than the voltage at the non-inverting input for a portion of the sine wave period. Thus, the main control module can further determine whether the AC power supply has stopped based on the duration of the received high-level signal. For example, if the duration exceeds a preset time, it determines that the AC power supply has stopped.

[0078] Secondly, in one embodiment, the present invention provides a circuit breaker, the circuit breaker including a trip unit and a trip control circuit of the circuit breaker in any of the above embodiments.

[0079] Among them, circuit breakers can be specifically classified as circuit breakers for smart home micro distribution boxes, circuit breakers for charging pile smart control terminals, and circuit breakers for industrial automation control cabinets, depending on the different application scenarios.

[0080] Circuit breakers in smart home miniature distribution boxes: In the miniature distribution boxes of smart home systems, filter capacitors are reused as energy storage elements for the trip unit, achieving dual-mode management of "filtering + power supply". During normal power supply, the filter capacitor filters the power for the smart meter. When a power outage or overvoltage fault is detected, the control drive module is activated, and the energy from the filter capacitor is instantly injected into the trip unit, cutting off the main circuit of the home within a short time. By reusing the filter capacitor, the relevant circuit boards can be compressed, reducing the size compared to traditional solutions. Furthermore, no battery is required, avoiding the risk of electrolyte leakage in the home environment, making it suitable for space-sensitive smart power distribution scenarios such as apartments and villas.

[0081] The circuit breaker in the intelligent control terminal of the charging pile: For electric vehicle charging piles in residential areas, the reuse of filter capacitors enables rapid tripping during power outages. The filter capacitors also serve as energy storage devices, filtering ripple to ensure metering accuracy during normal charging. When the grid voltage drops below a certain limit, the charging circuit is immediately cut off. The energy in the filter capacitors drives the trip unit, simultaneously sending a shutdown signal to the charging pile's main control unit. Since no independent energy storage element is required, the cost of the charging pile's power supply control system is reduced.

[0082] Circuit breakers in industrial automation control cabinets: In small industrial automation control cabinets, a maintenance-free power outage protection scheme is constructed by reusing filter capacitors. The filter capacitors are electrically connected to the trip unit. The main control module and detection module monitor the three-phase voltage in real time. When any phase loses power, the energy of the filter capacitors is output to the trip unit via the drive module to trigger the trip unit and prevent the motor from running on a single phase. It is suitable for industrial scenarios with stringent reliability and space requirements, such as assembly line control and machine tool equipment, eliminating the maintenance pain points of traditional battery solutions in dusty and vibrating environments.

[0083] By utilizing the tripping control circuit of the circuit breaker included in the aforementioned circuit breaker, the filter capacitor at the front end of the power supply module is reused. When the power supply is normal, the filter capacitor performs filtering and supplies power to the main control module through the power supply module. During this process, the filter capacitor stores energy. When the power supply stops, the main control module can detect this state through the detection module, thereby controlling the drive module to transfer the energy on the filter capacitor to the trip unit to realize the tripping operation of the trip unit. This utility model achieves the purpose of power outage tripping without the need for a separate battery or supercapacitor, simplifies the circuit structure, reduces the circuit size, and avoids the defects associated with batteries and supercapacitors.

[0084] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the detailed descriptions of other embodiments above, which will not be repeated here.

[0085] The communication circuit and circuit breaker provided by this utility model have been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand the method and core idea of ​​this utility model. At the same time, for those skilled in the art, there will be changes in the specific implementation and application scope based on the idea of ​​this utility model. Therefore, the content of this specification should not be construed as a limitation of this utility model.

[0086] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

Claims

1. A tripping control circuit for a circuit breaker, characterized in that, The tripping control circuit of the circuit breaker includes a filter capacitor (CE1), a power supply module, a main control module, a drive module, and a detection module. The filter capacitor (CE1) is electrically connected to the main control module through the power module and is also used for electrical connection to the power supply. The filter capacitor (CE1) and the drive module are used to connect in series with the trip unit. The main control module is also electrically connected to the drive module and is used to be electrically connected to the power supply through the detection module. When the power supply stops supplying power, the main control module controls the filter capacitor (CE1) to trip the trip unit.

2. The tripping control circuit of the circuit breaker according to claim 1, characterized in that, The drive module includes a switching unit and a current-limiting resistor (R17); The first and second access terminals of the switching unit are connected in series with the filter capacitor (CE1) and are used to connect in series with the trip unit. The controlled terminal of the switching unit is electrically connected to the main control module. The current limiting resistor (R17) is electrically connected to the first and second access terminals of the switching unit respectively. The main control module is used to control the switching unit to turn on when the power supply stops supplying power.

3. The tripping control circuit of the circuit breaker according to claim 2, characterized in that, The switching unit includes a first NMOS transistor (Q1) and a drive amplification subunit; The drain of the first NMOS transistor (Q1) is electrically connected to the first terminal of the trip unit, the filter capacitor (CE1) is electrically connected to the second terminal of the trip unit, the source of the first NMOS transistor (Q1) is grounded, the gate of the first NMOS transistor (Q1) is electrically connected to the main control module through the drive amplifier subunit, and the current limiting resistor (R17) is electrically connected to the drain and source of the first NMOS transistor (Q1) respectively.

4. The tripping control circuit of the circuit breaker according to claim 3, characterized in that, The drive amplifier subunit includes an NPN transistor (Q2), a PNP transistor (Q3), and a pull-up resistor (R13); The base of the NPN transistor (Q2) is electrically connected to the main control module. The collector of the NPN transistor (Q2) is electrically connected to the base of the PNP transistor (Q3) and is used to connect to the emitter of the PNP transistor (Q3) through the pull-up resistor (R13). The emitter of the NPN transistor (Q2) is grounded. The emitter of the PNP transistor (Q3) is also used to connect to the operating voltage. The collector of the PNP transistor (Q3) is electrically connected to the gate of the first NMOS transistor (Q1).

5. The tripping control circuit of the circuit breaker according to claim 1, characterized in that, The power module includes a transformer (T1) and a switching power supply control unit. The transformer includes a primary side (N1), a first secondary side (N2), and a second secondary side (N3). The input terminal of the primary side (N1) is electrically connected to the filter capacitor (CE1), and the output terminal of the primary side (N1) is grounded through the switching power supply control unit; The output terminal of the first secondary side (N2) is electrically connected to the power supply terminal of the switching power supply control unit, and the output terminal of the second secondary side (N3) is electrically connected to the power supply terminal of the main control module. The input terminals of the first secondary side (N2) and the second secondary side (N3) are respectively used for grounding.

6. The tripping control circuit of the circuit breaker according to claim 1, characterized in that, The circuit breaker also includes an overvoltage protection module; The filter capacitor (CE1) is used to be electrically connected to the power supply through the overvoltage protection module; The overvoltage protection module is used to disconnect the line between the power supply and the filter capacitor (CE1) when an overvoltage occurs in the power supply.

7. The tripping control circuit of the circuit breaker according to claim 6, characterized in that, The overvoltage protection module includes a first voltage divider resistor, a second NMOS transistor (Q4), and a first Zener diode; The drain of the second NMOS transistor (Q4) is electrically connected to the cathode of the first Zener diode and the gate of the second NMOS transistor (Q4) through the first voltage divider resistor and is used to connect to the power supply. The source of the second NMOS transistor (Q4) is electrically connected to the filter capacitor. The anode of the first Zener diode is used to ground.

8. The tripping control circuit of the circuit breaker according to claim 7, characterized in that, The overvoltage protection module also includes a second Zener diode; The cathode of the second Zener diode is electrically connected to the gate of the second NMOS transistor (Q4), and the anode of the second Zener diode is electrically connected to the source of the second NMOS transistor (Q4).

9. The tripping control circuit of the circuit breaker according to claim 1, characterized in that, The detection module includes a second voltage divider resistor, a third voltage divider resistor, and an operational amplifier (U2); The first end of the third voltage divider resistor is electrically connected to the first input terminal of the operational amplifier (U2) and is used to be electrically connected to the power supply through the second voltage divider resistor. The second end of the third voltage divider resistor is used to ground. The second input terminal of the operational amplifier (U2) is used to connect to the reference voltage. The output terminal of the operational amplifier (U2) is electrically connected to the main control module.

10. A circuit breaker, characterized in that, The circuit breaker includes a trip unit and a trip control circuit for the circuit breaker according to any one of claims 1 to 9.

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