Power supply circuit of release control chip, control circuit and circuit breaker system

Abstract

The utility model provides a power supply circuit of a release control chip, a control circuit and a circuit breaker system. The power supply circuit of the release control chip comprises a main power supply module and an auxiliary power supply module. The input end of the main power supply module and the input end of the auxiliary power supply module are respectively used for accessing working voltage, and the output end of the main power supply module and the output end of the auxiliary power supply module are respectively used for being electrically connected with the power supply end of the release control chip; and the auxiliary power supply module is used for being switched on after the working voltage is accessed so as to increase the current accessed to the power supply end of the release control chip, and is switched off when the voltage of the power supply end of the release control chip reaches the target power supply voltage. The auxiliary power supply module is additionally arranged on the basis of the main power supply module and can be switched on after the working voltage is accessed, so that the current output by the power supply circuit is improved, the voltage rise of the power supply end of the release control chip is accelerated, and the aim of quickly electrifying and starting the release control chip is fulfilled.

Description

Technical Field

[0001] This utility model relates to the field of circuit breaker technology, specifically to a power supply circuit, control circuit, and circuit breaker system for a trip unit control chip. Background Technology

[0002] Residual current circuit breakers (RCCBs) are important protective devices specifically designed to provide protection against both direct and indirect electric shock. They are widely used in various electrical applications, including industrial, commercial, high-rise buildings, and residential buildings, and offer significant advantages such as compact size, ease of operation, high breaking capacity, and high reliability.

[0003] Commonly available miniature residual current circuit breakers typically use a dedicated trip control chip for leakage current. The corresponding power supply circuit powers the trip control chip, and the trip signal output by the trip control chip after power-on drives the switch module to conduct, triggering the trip unit to operate.

[0004] In the existing technology, the power supply circuit of the trip unit control chip cannot quickly power on the trip unit control chip after the power is connected, which can easily lead to lag in related control. Utility Model Content

[0005] In view of the shortcomings of the existing technology, this utility model provides a power supply circuit, control circuit and circuit breaker system for a trip unit control chip.

[0006] In one embodiment, the present invention provides a power supply circuit for a trip unit control chip, the power supply circuit for the trip unit control chip including a main power supply module and an auxiliary power supply module.

[0007] The input terminals of the main power supply module and the auxiliary power supply module are used to connect to the working voltage, and the output terminals of the main power supply module and the auxiliary power supply module are used to electrically connect to the power supply terminal of the trip unit control chip.

[0008] The auxiliary power supply module is used to turn on after the working voltage is applied to increase the current connected to the power supply terminal of the trip unit control chip, and to turn off when the voltage at the power supply terminal of the trip unit control chip reaches the target power supply voltage.

[0009] In one embodiment, the auxiliary power supply module includes a voltage regulator unit, a MOSFET, and a first resistor;

[0010] The drain of the MOSFET is electrically connected to the first terminal of the first resistor, the source of the MOSFET is electrically connected to the output terminal of the main power supply module, and the second terminal of the first resistor is electrically connected to the input terminal of the main power supply module; or, the drain of the MOSFET is electrically connected to the input terminal of the main power supply module, the source of the MOSFET is electrically connected to the first terminal of the first resistor, and the second terminal of the first resistor is electrically connected to the output terminal of the main power supply module.

[0011] The input terminal of the voltage regulator unit is electrically connected to the input terminal of the main power supply module, and the output terminal of the voltage regulator unit is electrically connected to the gate of the MOSFET. The voltage regulator unit is used to output the target drive voltage to the gate of the MOSFET according to the input operating voltage.

[0012] Specifically, the target drive voltage is greater than the MOSFET's on-bias voltage, and the difference between the target drive voltage and the target power supply voltage is less than the MOSFET's on-bias voltage.

[0013] In one embodiment, the voltage regulator unit includes a Zener diode and a second resistor;

[0014] The cathode of the Zener diode is electrically connected to the gate of the MOSFET and the first terminal of the second resistor, respectively. The anode of the Zener diode is grounded, and the second terminal of the second resistor is electrically connected to the input terminal of the main power supply module.

[0015] In one embodiment, the voltage regulator unit includes a reference source, a second resistor, a third resistor, and a fourth resistor;

[0016] The cathode of the reference source is electrically connected to the first end of the second resistor, the first end of the third resistor, and the gate of the MOS transistor, respectively. The second end of the second resistor is electrically connected to the input terminal of the main power supply module. The second end of the third resistor is electrically connected to the first end of the fourth resistor and the reference electrode of the reference source, respectively. The second end of the fourth resistor and the anode of the reference source are used for grounding.

[0017] In one embodiment, the main power supply module includes a main circuit resistor;

[0018] The resistance of the first resistor is less than the resistance of the main circuit resistor.

[0019] Secondly, in one embodiment, the present invention provides a control circuit for a trip unit, the control circuit of the trip unit including a trip unit control chip, a switching module, and a power supply circuit for the trip unit control chip in any of the above embodiments.

[0020] The first access terminal of the switch module is used to electrically connect to the output terminal of the coil in the trip unit, the controlled terminal of the switch module is electrically connected to the output terminal of the trip unit control chip, and the second access terminal of the switch module is used for grounding.

[0021] In one embodiment, the switching module includes a first thyristor and a second thyristor;

[0022] The anode of the first thyristor is electrically connected to the output terminal of the coil in the trip unit. The cathode of the first thyristor is electrically connected to the anode of the second thyristor. The control electrode of the first thyristor is electrically connected to the power supply terminal of the trip unit control chip. The control electrode of the second thyristor is electrically connected to the output terminal of the trip unit control chip. The cathode of the second thyristor is grounded.

[0023] In one embodiment, the control circuit of the trip unit further includes a rectifier unit;

[0024] The input terminal of the rectifier unit is used to connect to AC voltage, and the output terminal of the rectifier unit is electrically connected to the input terminals of the main power supply module and the auxiliary power supply module, respectively, to output the working voltage.

[0025] In one embodiment, the output terminal of the coil in the trip unit is electrically connected to the input terminal of the main power supply module, the input terminal of the auxiliary power supply module, and the first access terminal of the switch module, respectively; the rectifier unit includes a first rectifier diode, a second rectifier diode, a third rectifier diode, a fourth rectifier diode, a fifth rectifier diode, and a sixth rectifier diode;

[0026] The anode of the first rectifier diode and the cathode of the second rectifier diode are respectively connected to the neutral wire; the anode of the third rectifier diode and the cathode of the fourth rectifier diode are respectively connected to the first live wire; the anode of the fifth rectifier diode is connected to the second live wire; and the cathode of the sixth rectifier diode is connected to the third live wire.

[0027] The cathodes of the first, third, and fifth rectifier diodes are electrically connected to the input terminal of the coil in the trip unit, respectively. The anodes of the second, fourth, and sixth rectifier diodes are grounded.

[0028] In one embodiment, the control circuit of the trip unit further includes a residual current acquisition unit;

[0029] The residual current acquisition unit is electrically connected to the input terminal of the trip unit control chip and is used to acquire the residual current of the circuit controlled by the trip unit and feed it back to the trip unit control chip.

[0030] Thirdly, in one embodiment, the present invention provides a circuit breaker system, the circuit breaker system including a trip unit and a control circuit for the trip unit in any of the above embodiments.

[0031] Through the power supply circuit, control circuit, and circuit breaker system of the trip unit control chip, an auxiliary power supply module is set up on the basis of the main power supply module. It can be turned on after the working voltage is applied to increase the output current of the power supply circuit, thereby accelerating the voltage rise of the power supply terminal of the trip unit control chip and realizing the purpose of rapid power-on and start-up of the trip unit control chip. Furthermore, the auxiliary power supply module is turned off when the voltage at the power supply terminal of the trip unit control chip reaches the target power supply voltage for startup, so that the main power supply module provides a more stable and sustainable power supply. Attached Figure Description

[0032] 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.

[0033] Figure 1 This is a schematic diagram of the power supply circuit of the trip unit control chip in one embodiment of the present invention;

[0034] Figure 2 This is a schematic diagram of the control circuit of the trip unit in one embodiment of the present invention;

[0035] Figure 3 This is a schematic diagram of a structure using a reference source for voltage stabilization in one embodiment of the present invention;

[0036] Figure 4 This is a schematic diagram of the surge protection unit and the rectifier unit 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 power supply circuit for a trip unit control chip, the power supply circuit for the trip unit control chip including a main power supply module and an auxiliary power supply module.

[0040] The input terminals of the main power supply module and the auxiliary power supply module are respectively used to connect to the working voltage NET_DC, and the output terminals of the main power supply module and the auxiliary power supply module are respectively used to connect to the power supply terminal VDD of the trip unit control chip IC.

[0041] When the auxiliary power supply module is not turned on, the operating voltage NET_DC is supplied to the trip unit control chip IC only through the main power supply module. When the auxiliary power supply module is turned on, the operating voltage NET_DC is supplied to the trip unit control chip IC through both the main power supply module and the auxiliary power supply module.

[0042] The auxiliary power supply module is used to turn on after the working voltage NET_DC is applied to increase the current connected to the power supply terminal VDD of the trip unit control chip IC, and to turn off when the voltage of the power supply terminal VDD of the trip unit control chip IC reaches the target power supply voltage.

[0043] The main power supply module and the auxiliary power supply module are connected in parallel. Therefore, when the auxiliary power supply module is turned on, the parallel impedance between the auxiliary power supply module and the main power supply module decreases. With the operating voltage NET_DC remaining unchanged, the output current of the power supply circuit can be increased. The trip unit control chip IC usually has a corresponding power supply capacitor inside, which can accelerate the charging of the power supply capacitor when the current increases, thereby enabling the voltage at the power supply terminal VDD of the trip unit control chip IC to quickly reach the target power supply voltage.

[0044] Furthermore, the impedance of the auxiliary power supply module can be less than that of the main power supply module to further improve the current increase effect.

[0045] When the voltage at the power supply terminal VDD of the trip unit control chip IC reaches the target power supply voltage, the trip unit control chip IC can be powered on and started. At this time, the auxiliary power supply module is no longer needed to provide the current branch. Therefore, the auxiliary power supply module can be disconnected based on the target power supply voltage as the trigger condition.

[0046] By adding an auxiliary power supply module to the main power supply module through the power supply circuit of the trip unit control chip, the auxiliary power supply module can be turned on after the working voltage is applied to increase the output current of the power supply circuit, thereby accelerating the voltage rise of the power supply terminal of the trip unit control chip and realizing the purpose of rapid power-on and start-up of the trip unit control chip. Furthermore, the auxiliary power supply module is turned off when the voltage at the power supply terminal of the trip unit control chip reaches the target power supply voltage for startup, so that the main power supply module provides a more stable and sustainable power supply.

[0047] like Figure 2 As shown, in one embodiment, the auxiliary power supply module includes a voltage regulator unit, a MOSFET Q1, and a first resistor (including resistor R10). The voltage regulator unit includes a Zener diode ZD2 and a second resistor (including resistors R11, R12, R13, and R14). The main power supply module includes a main circuit resistor (including resistors R8 and R9).

[0048] In this configuration, the drain of MOSFET Q1 is electrically connected to the first terminal of resistor R10, the source of MOSFET Q1 is electrically connected to the first terminal of resistor R8, the second terminal of resistor R8 is electrically connected to the first terminal of resistor R9, and the second terminal of resistor R10 is electrically connected to the second terminal of resistor R9, so as to connect to the operating voltage NET_DC.

[0049] The cathode of Zener diode ZD2 is electrically connected to the second terminal of resistor R9 in the main power supply module through resistors R11, R12, R13 and R14 in series to receive the operating voltage NET_DC. The cathode of Zener diode ZD2 is also directly connected to the gate of MOSFET Q1 to output the target drive voltage to the gate of MOSFET Q1 according to the received operating voltage NET_DC. The anode of Zener diode ZD2 is used for grounding.

[0050] Specifically, the target drive voltage is greater than the on-bias voltage of MOSFET Q1, and the difference between the target drive voltage and the target power supply voltage is less than the on-bias voltage of MOSFET Q1.

[0051] For example, by selecting Zener diode ZD2, the cathode voltage of ZD2 is maintained at 7.5V. When the operating voltage NET_DC is applied, due to the presence of Zener diode ZD2, the gate voltage of MOSFET Q1 rapidly rises to 7.5V. At this time, the power supply voltage VDD of the trip unit control chip IC is essentially zero, and the bias voltage between the gate and source of MOSFET Q1 is 7.5V - 0 = 7.5V. By selecting MOSFET Q1, the conduction bias voltage of MOSFET Q1 is set to 3V. Since the actual bias voltage is greater than the conduction bias voltage, MOSFET Q1 conducts. Because the series impedance of MOSFET Q1 and resistor R10 is in parallel with the series impedance of resistors R8 and R9, when MOSFET Q1 conducts, the current output to the power supply terminal VDD of the trip unit control chip IC is increased.

[0052] Furthermore, if the target power supply voltage of the trip unit control chip IC is 5V, when the voltage at the power supply terminal VDD of the trip unit control chip IC reaches the target power supply voltage, the bias voltage between the gate and source of MOSFET Q1 is 7.5V - 5V = 2.5V. At this time, the actual bias voltage is less than the conduction bias voltage, and MOSFET Q1 is turned off. The current is then supplied by resistors R8 and R9.

[0053] In other embodiments, the auxiliary power supply module may also use other types of switching transistors besides MOSFETs, such as silicon controlled rectifiers (SCRs) and IGBTs.

[0054] Furthermore, the resistance value of resistor R10 can be less than the series resistance value of resistors R8 and R9. The resistance value of resistor R10 can be determined and set according to the startup time required by the control chip IC.

[0055] like Figure 3As shown, in one embodiment, the voltage regulator unit may further include a reference source U1, a second resistor (including resistors R11, R12, R13, and R14), a third resistor (including resistor R15), and a fourth resistor (including resistor R16).

[0056] The cathode of the reference source U1 is electrically connected to the main power supply module through resistors R11, R12, R13 and R14 connected in series to access the operating voltage NET_DC. The cathode of the reference source U1 is also directly connected to the gate of the MOSFET Q1 and the first end of resistor R15. The second end of resistor R15 is connected to the first end of resistor R16 and the reference electrode of the reference source U1. The second end of resistor R16 and the anode of the reference source U1 are used for grounding.

[0057] The reference source U1 can provide a stable target drive voltage to the gate of the MOS transistor Q1 based on the input operating voltage NET_DC. The relevant details and principles can be found in the above embodiments, and will not be repeated here.

[0058] like Figure 2 or Figure 3 As shown, in one embodiment, the voltage regulator unit further includes a capacitor C9, which is connected in parallel across the Zener diode ZD2 or in parallel across the reference source U1.

[0059] Among them, capacitor C9 plays a filtering role.

[0060] Secondly, such as Figure 2 As shown, in one embodiment, the present invention provides a control circuit for a trip unit. The control circuit for the trip unit includes a trip unit control chip IC, a switching module (including a first thyristor VT1 and a second thyristor VT2), and a power supply circuit for the trip unit control chip in any of the above embodiments.

[0061] The anode of the first thyristor VT1 is electrically connected to the output terminal of the coil in the trip unit to receive the operating voltage NET_DC output by the coil in the trip unit. The cathode of the first thyristor VT1 is electrically connected to the anode of the second thyristor VT2. The control electrode of the first thyristor VT1 is electrically connected to the power supply terminal VDD of the trip unit control chip IC through resistor R4 and anti-reverse diode VD9. The control electrode of the second thyristor VT2 is electrically connected to the output terminal OS of the trip unit control chip IC. The cathode of the second thyristor VT2 is grounded.

[0062] When using a thyristor as a switching module, it is necessary to ensure that the connected operating voltage NET_DC has a zero-crossing point, so that the trip unit control chip IC can control the on / off state of the second thyristor VT2 based on the zero-crossing.

[0063] When the operating voltage NET_DC is applied, the control electrode of the first thyristor VT1 is directly connected to the power supply terminal VDD of the trip unit control chip IC, so it can be turned on synchronously. The on / off state of the second thyristor VT2 is determined by the control signal output by the output terminal OS of the trip unit control chip IC.

[0064] In other embodiments, the switching module can also be constructed using other switching devices besides thyristors, such as MOSFETs. It should be noted that while using MOSFETs can achieve the same effect, it may require additional drive circuitry, increasing both cost and space requirements.

[0065] Through the control circuit of the trip unit described above, an auxiliary power supply module is set up on the basis of the main power supply module. It can be turned on after the working voltage is applied to increase the output current of the power supply circuit, thereby accelerating the voltage rise of the power supply terminal of the trip unit control chip and realizing the purpose of rapid power-on and start-up of the trip unit control chip. Furthermore, the auxiliary power supply module is turned off when the voltage at the power supply terminal of the trip unit control chip reaches the target power supply voltage for startup, so that the main power supply module provides a more stable and sustainable power supply.

[0066] like Figure 2 As shown, in one embodiment, the control circuit of the trip unit further includes a varistor RV4.

[0067] The first end of the varistor RV4 is electrically connected to the anode of the first thyristor VT1, and the second end of the varistor RV4 is electrically connected to the cathode of the second thyristor VT2.

[0068] While both the first thyristor VT1 and the second thyristor VT2 possess high-voltage resistance, they can still be damaged if the voltage across them is excessively high, such as during a lightning strike. Therefore, in this embodiment, a varistor RV4 is added to address this issue. When the voltage is below the rated voltage of the varistor RV4, it exhibits a high resistance value, allowing only a small current to flow. However, when the voltage exceeds its rated voltage, the resistance of the varistor RV4 rapidly decreases, forming a low-impedance path that allows the overvoltage to flow through, thereby protecting both the first thyristor VT1 and the second thyristor VT2.

[0069] In one embodiment, the control circuit of the trip unit further includes a residual current acquisition unit.

[0070] The residual current acquisition unit is electrically connected to the input terminal of the trip unit control chip and is used to acquire the residual current of the circuit controlled by the trip unit and feed it back to the trip unit control chip.

[0071] The trip unit control chip can determine whether to perform a trip operation based on the residual current. When the residual current is too large, the safety hazard is high, so a trip operation is required, so that the trip unit control chip controls the trip unit to trip through the subsequent devices.

[0072] like Figure 2 As shown, in one embodiment, the residual current acquisition unit includes a current transformer connected via terminals TA1 and TA2, a current operating value adjustment resistor (including resistor R1* and resistor R1), and a bidirectional diode D1.

[0073] The first terminal of the current transformer (e.g., terminal TA1) is electrically connected to the first terminal of resistor R1*, the first terminal of resistor R1, the first terminal of bidirectional diode D1, and the first input terminal In1 of the trip control chip IC. The second terminal of the current transformer (e.g., terminal TA2) is electrically connected to the second terminal of resistor R1*, the second terminal of resistor R1, the second terminal of bidirectional diode D1, and the second input terminal In2 of the trip control chip IC.

[0074] The current transformer is used to collect the residual current of the circuit controlled by the trip unit.

[0075] Among them, resistors R1* and R1 can be adjusted according to the residual current operating value.

[0076] The bidirectional diode D1 can be composed of two diodes to limit and absorb the abnormal peak surge signal of the residual current collected by the current transformer, thereby ensuring that the input voltage does not exceed the maximum withstand voltage of the control chip.

[0077] It should be noted that, Figure 2 The resistors R2 and R3, capacitors C1, C2, C3, C4, C5, C6, C7, C8, and Zener diode ZD1 shown are all basic components for realizing the basic functions of the circuit, and their specific principles will not be elaborated here.

[0078] In one embodiment, the control circuit of the trip unit further includes a rectifier unit.

[0079] The input terminal of the rectifier unit is used to connect to AC voltage, and the output terminal of the rectifier unit is electrically connected to the input terminals of the main power supply module and the auxiliary power supply module, respectively, to output the working voltage.

[0080] The circuit breaker system is usually connected to AC voltage to power its internal components, so a corresponding rectifier unit is required. The rectifier unit rectifies the AC voltage to obtain the corresponding DC voltage.

[0081] like Figure 2 and Figure 4As shown, in one embodiment, the output terminal of the coil in the trip unit KA is electrically connected to the input terminal of the main power supply module, the input terminal of the auxiliary power supply module, and the first access terminal of the switch module, respectively, to output the working voltage NET_DC; the rectifier unit includes a first rectifier diode VD1, a second rectifier diode VD2, a third rectifier diode VD3, a fourth rectifier diode VD4, a fifth rectifier diode VD5, and a sixth rectifier diode VD6.

[0082] The anode of the first rectifier diode VD1 and the cathode of the second rectifier diode VD2 are respectively used to connect to the neutral wire N; the anode of the third rectifier diode VD3 and the cathode of the fourth rectifier diode VD4 are respectively used to connect to the first live wire A; the anode of the fifth rectifier diode VD5 is used to connect to the second live wire B; and the cathode of the sixth rectifier diode VD6 is used to connect to the third live wire C.

[0083] The cathodes of the first rectifier diode VD1, the third rectifier diode VD3, and the fifth rectifier diode VD5 are electrically connected to the input terminal of the coil in the trip unit KA, respectively. The anodes of the second rectifier diode VD2, the fourth rectifier diode VD4, and the sixth rectifier diode VD6 are used for grounding.

[0084] In this embodiment, the rectifier unit uses half-wave rectification for two phases of the live wire and neutral wire N, and bridge full-wave rectification for the third phase of the live wire and neutral wire N. This ensures that any two phases can be powered while guaranteeing that the output operating voltage NET_DC has a chance to cross zero, thus meeting the control conditions of the thyristor-based switching module. Through the rectification settings in this embodiment, the thyristor on / off control conditions are achieved. This ensures that if the power line is incorrectly connected to the circuit breaker's load side, the leakage current triggering will trip normally. Once the leakage current disappears after the circuit breaker opens, the control chip will not output a trip signal. The thyristor will disconnect when NET_DC crosses zero, thus preventing product damage.

[0085] In one embodiment, the control circuit of the trip unit also includes a surge protection unit, such as... Figure 4 As shown, the surge protection unit includes varistors RV1, RV2, RV3, and RV5.

[0086] Among them, varistor RV1 is electrically connected between the first live wire A and the neutral wire N of the three-phase four-wire AC power supply, varistor RV2 is electrically connected between the second live wire B and the neutral wire N of the three-phase four-wire AC power supply, and varistor RV3 is electrically connected between the third live wire C and the neutral wire N of the three-phase four-wire AC power supply.

[0087] Among them, varistor RV1, varistor RV2, and varistor RV3 are used in conjunction with varistor RV5 to protect the surge voltage on the corresponding phase, preventing it from flowing to the downstream stage and damaging related devices.

[0088] Thirdly, in one embodiment, the present invention provides a circuit breaker system, the circuit breaker system including a trip unit and a control circuit for the trip unit in any of the above embodiments.

[0089] By adding an auxiliary power supply module to the main power supply module in the circuit breaker system described above, the auxiliary power supply module can be turned on after the working voltage is applied to increase the output current of the power supply circuit, thereby accelerating the voltage rise at the power supply terminal of the trip unit control chip and achieving the purpose of rapid power-on and start-up of the trip unit control chip. Furthermore, the auxiliary power supply module is turned off when the voltage at the power supply terminal of the trip unit control chip reaches the target power supply voltage for startup, thus providing a more stable and sustainable power supply from the main power supply module.

[0090] 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.

[0091] The power supply circuit, control circuit, and circuit breaker system of the trip unit control chip 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.

[0092] 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 power supply circuit for a trip unit control chip, characterized in that, The power supply circuit of the trip unit control chip includes a main power supply module and an auxiliary power supply module; The input terminals of the main power supply module and the auxiliary power supply module are respectively used to connect to the working voltage, and the output terminals of the main power supply module and the auxiliary power supply module are respectively used to electrically connect to the power supply terminal of the trip unit control chip. The auxiliary power supply module is used to turn on after the working voltage is applied to increase the current connected to the power supply terminal of the trip unit control chip, and to turn off when the voltage at the power supply terminal of the trip unit control chip reaches the target power supply voltage.

2. The power supply circuit for the trip unit control chip according to claim 1, characterized in that, The auxiliary power supply module includes a voltage regulator unit, a MOSFET, and a first resistor; The drain of the MOSFET is electrically connected to the first terminal of the first resistor, the source of the MOSFET is electrically connected to the output terminal of the main power supply module, and the second terminal of the first resistor is electrically connected to the input terminal of the main power supply module; or, the drain of the MOSFET is electrically connected to the input terminal of the main power supply module, the source of the MOSFET is electrically connected to the first terminal of the first resistor, and the second terminal of the first resistor is electrically connected to the output terminal of the main power supply module. The input terminal of the voltage regulator unit is electrically connected to the input terminal of the main power supply module, and the output terminal of the voltage regulator unit is electrically connected to the gate of the MOS transistor. The voltage regulator unit is used to output a target drive voltage to the gate of the MOS transistor according to the input operating voltage. Wherein, the target driving voltage is greater than the on-bias voltage of the MOS transistor, and the difference between the target driving voltage and the target power supply voltage is less than the on-bias voltage of the MOS transistor.

3. The power supply circuit for the trip unit control chip according to claim 2, characterized in that, The voltage regulator unit includes a Zener diode and a second resistor; The cathode of the Zener diode is electrically connected to the gate of the MOS transistor and the first terminal of the second resistor, respectively. The anode of the Zener diode is grounded, and the second terminal of the second resistor is electrically connected to the input terminal of the main power supply module.

4. The power supply circuit for the trip unit control chip according to claim 2, characterized in that, The voltage regulator unit includes a reference source, a second resistor, a third resistor, and a fourth resistor; The cathode of the reference source is electrically connected to the first end of the second resistor, the first end of the third resistor, and the gate of the MOS transistor, respectively. The second end of the second resistor is electrically connected to the input terminal of the main power supply module. The second end of the third resistor is electrically connected to the first end of the fourth resistor and the reference electrode of the reference source, respectively. The second end of the fourth resistor and the anode of the reference source are respectively used for grounding.

5. The power supply circuit for the trip unit control chip according to any one of claims 2 to 4, characterized in that, The main power supply module includes a main circuit resistor; The resistance value of the first resistor is less than the resistance value of the main circuit resistor.

6. A control circuit for a trip unit, characterized in that, The control circuit of the trip unit includes a trip unit control chip, a switching module, and a power supply circuit for the trip unit control chip as described in any one of claims 1 to 5. The first access terminal of the switch module is used to be electrically connected to the output terminal of the coil in the trip unit, the controlled terminal of the switch module is electrically connected to the output terminal of the trip unit control chip, and the second access terminal of the switch module is used to ground.

7. The control circuit of the trip unit according to claim 6, characterized in that, The switching module includes a first thyristor and a second thyristor; The anode of the first thyristor is electrically connected to the output terminal of the coil in the trip unit, the cathode of the first thyristor is electrically connected to the anode of the second thyristor, the control electrode of the first thyristor is electrically connected to the power supply terminal of the trip unit control chip, the control electrode of the second thyristor is electrically connected to the output terminal of the trip unit control chip, and the cathode of the second thyristor is grounded.

8. The control circuit of the trip unit according to claim 6 or 7, characterized in that, The control circuit of the trip unit also includes a rectifier unit; The input terminal of the rectifier unit is used to connect to AC voltage, and the output terminal of the rectifier unit is electrically connected to the input terminal of the main power supply module and the input terminal of the auxiliary power supply module, respectively, for outputting the working voltage.

9. The control circuit of the trip unit according to claim 8, characterized in that, The output terminal of the coil in the trip unit is electrically connected to the input terminal of the main power supply module, the input terminal of the auxiliary power supply module, and the first access terminal of the switch module, respectively; the rectifier unit includes a first rectifier diode, a second rectifier diode, a third rectifier diode, a fourth rectifier diode, a fifth rectifier diode, and a sixth rectifier diode; The anode of the first rectifier diode and the cathode of the second rectifier diode are respectively used to be electrically connected to the neutral wire; the anode of the third rectifier diode and the cathode of the fourth rectifier diode are respectively used to be electrically connected to the first live wire; the anode of the fifth rectifier diode is used to be electrically connected to the second live wire; and the cathode of the sixth rectifier diode is used to be electrically connected to the third live wire. The cathodes of the first rectifier diode, the third rectifier diode, and the fifth rectifier diode are electrically connected to the input terminal of the coil in the trip unit, respectively. The anodes of the second rectifier diode, the fourth rectifier diode, and the sixth rectifier diode are grounded.

10. The control circuit of the trip unit according to claim 6, characterized in that, The control circuit of the trip unit also includes a residual current acquisition unit; The residual current acquisition unit is electrically connected to the input terminal of the trip unit control chip, and is used to acquire the residual current of the circuit controlled by the trip unit and feed it back to the trip unit control chip.

11. A circuit breaker system, characterized in that, The circuit breaker system includes a trip unit and a control circuit for the trip unit as described in any one of claims 6 to 10.

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