CN-224233335-U - Trip control circuit and residual current operated circuit breaker

CN224233335UCN 224233335 UCN224233335 UCN 224233335UCN-224233335-U

Abstract

The utility model discloses a tripping control circuit and a residual current operated circuit breaker, and belongs to the technical field of leakage protection. In the residual current operated circuit breaker applying the tripping control circuit, the electromagnetic tripping device releases the action part when the tripping coil is powered off so as to drive the tripping mechanism to execute tripping action. The tripping control circuit comprises a leakage detection module, a control module, a power supply module, a voltage reduction module, a switch module and an energy storage module, wherein the leakage detection module is used for detecting the leakage state of a protected circuit, the voltage reduction module is connected with the power supply module, the switch module and the tripping coil are connected between the output end of the voltage reduction module and the ground in series, the control module is used for controlling the on-off state of the switch module according to the leakage state, and the energy storage module is used for storing energy when the power supply module outputs a power supply signal and supplying power to the tripping coil when the power supply module does not output the power supply signal. The embodiment of the utility model can improve the safety and reliability of the residual current operated circuit breaker.

Inventors

YANG YU
KANG KUAN
ZHENG FAJIN
KE YIMENG

Assignees

浙江正泰电器股份有限公司

Dates

Publication Date: 20260512
Application Date: 20250512

Claims (10)

1. The tripping control circuit is characterized by being applied to a residual current operated circuit breaker, wherein the residual current operated circuit breaker comprises a switch, an electromagnetic tripping device and a tripping mechanism, wherein the switch is arranged in a protected circuit; The tripping control circuit comprises a leakage detection module, a control module, a power supply module, a voltage reduction module, a switch module and an energy storage module; the electric leakage detection module is used for detecting the electric leakage state of the protected circuit; the input end of the voltage reduction module is connected with the output end of the power supply module; The control module is respectively connected with the electric leakage detection module and the control end of the switch module, and is used for controlling the on-off state of the switch module according to the electric leakage state; The energy storage module is used for storing energy when the power supply module outputs a power supply signal and supplying power to the tripping coil when the power supply module does not output the power supply signal.
2. The trip control circuit of claim 1, wherein said control module comprises: the input end of the first voltage reduction unit is connected with the output end of the power supply module; The input end of the leakage protection unit is connected with the leakage detection module, and the power supply end of the leakage protection unit is connected with the output end of the first voltage reduction unit; The control end of the potential control unit is connected with the output end of the leakage protection unit, the first input end of the potential control unit is connected with the output end of the power supply module, the second input end of the potential control unit is grounded, the output end of the potential control unit is connected with the control end of the switch module, and the potential control unit is used for controlling and outputting the potential accessed by the first input end or the second input end of the potential control unit according to the potential of the control end of the potential control unit.
3. The trip control circuit of claim 2, wherein said first voltage reduction unit comprises a first capacitor and two resistor branches, wherein said first capacitor is connected between the output terminal of said first voltage reduction unit and ground, and wherein said two resistor branches are connected in parallel between the input terminal and the output terminal of said first voltage reduction unit; The leakage protection unit comprises a leakage protection chip, wherein an input pin of the leakage protection chip is connected with an input end of the leakage protection unit, a power supply pin of the leakage protection chip is connected with a power supply end of the leakage protection unit, an output pin of the leakage protection chip is connected with an output end of the leakage protection unit, and a grounding pin of the leakage protection chip is grounded; The potential control unit comprises a first transistor, a first resistor and a second capacitor, wherein the control electrode of the first transistor is connected with the control end of the potential control unit, the first electrode of the first transistor is connected with the second input end of the potential control unit, the second electrode of the first transistor is respectively connected with the second end of the first resistor, the first end of the second capacitor and the output end of the potential control unit, the first end of the first resistor is connected with the first input end of the potential control unit, and the second end of the second capacitor is grounded.
4. The trip control circuit of claim 1, wherein a first end of the trip coil is connected to an output of the buck module, a second end of the trip coil is connected to a first end of the switch module, and a second end of the switch module is grounded; The energy storage module includes: the input end of the second voltage reduction unit is connected with the output end of the power supply module; The first end of the energy storage unit is respectively connected with the output end of the second voltage reduction unit and the first end of the tripping coil, and the second end of the energy storage unit is grounded; The control end of the switch unit is connected with the output end of the second voltage reduction unit, the input end of the switch unit is grounded, and the output end of the switch unit is connected with the second end of the tripping coil.
5. The trip control circuit of claim 4, wherein said second buck unit includes a second resistor connected between an input and an output of said second buck unit; the energy storage unit comprises a third capacitor, wherein a first end of the third capacitor is connected with a first end of the energy storage unit, and a second end of the third capacitor is connected with a second end of the energy storage unit; The switch unit comprises an optical coupler, wherein a first end of a transmitting part of the optical coupler is connected with a control end of the switch unit, a second end of the transmitting part of the optical coupler is grounded, a first end of a receiving part of the optical coupler is connected with an input end of the switch unit, a second end of the receiving part of the optical coupler is connected with an output end of the switch unit, and the optical coupler is configured to turn off the receiving part when the transmitting part emits light and turn on the receiving part when the transmitting part does not emit light.
6. The trip control circuit of claim 5, wherein said energy storage unit further comprises a first diode, a second diode, and a third resistor, said first diode being connected between the output of said second buck unit and the first end of said third capacitor, said second diode and said third resistor being connected in series between the first end of said third capacitor and the first end of said trip coil; The switch unit also comprises a fourth capacitor and a first voltage stabilizing tube which are both connected between the control end of the switch unit and the ground.
7. The trip control circuit of claim 1, wherein the buck module comprises a fourth resistor and a fifth capacitor, a first end of the fourth resistor is connected to the output of the power module, a second end of the fourth resistor is connected to the output of the buck module and the first end of the fifth capacitor, respectively, and a second end of the fifth capacitor is grounded.
8. The trip control circuit of claim 7, wherein the buck module further includes a third diode and a second voltage regulator, the third diode being connected between the second terminal of the fourth resistor and the output terminal of the buck module, the second voltage regulator being connected between the output terminal of the buck module and ground.
9. The trip control circuit of claim 1, wherein said power module comprises a rectifier bridge, an input of said rectifier bridge being connected to an ac power source, an output of said rectifier bridge being an output of said power module; And/or the number of the groups of groups, The switch module comprises a silicon controlled rectifier, wherein the silicon controlled rectifier and the tripping coil are connected in series between the output end of the voltage reduction module and the ground, and a control electrode of the silicon controlled rectifier is used as a control end of the switch module; And/or the number of the groups of groups, The trip control circuit further includes: The first end of the fifth resistor is connected with the output end of the voltage dropping module, and the tripping coil and the switch module are connected in series between the second end of the fifth resistor and the ground; and the fourth diode is connected between two ends of the tripping coil.
10. A residual current operated circuit breaker comprising a switch, a trip mechanism, an electromagnetic trip unit and a trip control circuit as claimed in any one of claims 1 to 9.

Description

Trip control circuit and residual current operated circuit breaker Technical Field The utility model relates to the technical field of leakage protection, in particular to a tripping control circuit and a residual current operated circuit breaker. Background At present, an electronic residual current operated circuit breaker in the market is easy to be damaged due to abnormality under the conditions of unstable load external circuit environment, reverse wiring or wrong use, and the damaged circuit breaker cannot protect against abnormal leakage, so that certain potential safety hazard exists. Specifically, the leakage action coil in the circuit breaker in the related art is generally electrified and tripped, the capability of carrying continuous tripping current is poor, the leakage action coil is easy to damage in wrong operations such as wrong wiring (e.g. reverse wiring) or long-time pressing of a test button, and the leakage protection product in the related art is usually not operated when the leakage protection product itself is abnormal, for example, the coil cannot be electrified and cannot execute tripping due to the damage of an internal circuit of the product, no external abnormal performance exists, so that the product is not easy to find out abnormal conditions, and the circuit breaker can still normally close under the abnormal conditions of the product, so that the use risk and potential hidden danger exist. Disclosure of utility model The utility model provides a tripping control circuit and a residual current operated circuit breaker, which are used for improving the safety and reliability of the residual current operated circuit breaker. The embodiment of the utility model provides a tripping control circuit which is applied to a residual current operated circuit breaker, wherein the residual current operated circuit breaker comprises a switch, an electromagnetic release and a tripping mechanism, wherein the switch is arranged in a protected circuit; The tripping control circuit comprises a leakage detection module, a control module, a power supply module, a voltage reduction module, a switch module and an energy storage module; the electric leakage detection module is used for detecting the electric leakage state of the protected circuit; the input end of the voltage reduction module is connected with the output end of the power supply module; The control module is respectively connected with the electric leakage detection module and the control end of the switch module, and is used for controlling the on-off state of the switch module according to the electric leakage state; The energy storage module is used for storing energy when the power supply module outputs a power supply signal and supplying power to the tripping coil when the power supply module does not output the power supply signal. Optionally, the control module includes: the input end of the first voltage reduction unit is connected with the output end of the power supply module; The input end of the leakage protection unit is connected with the leakage detection module, and the power supply end of the leakage protection unit is connected with the output end of the first voltage reduction unit; The control end of the potential control unit is connected with the output end of the leakage protection unit, the first input end of the potential control unit is connected with the output end of the power supply module, the second input end of the potential control unit is grounded, the output end of the potential control unit is connected with the control end of the switch module, and the potential control unit is used for controlling and outputting the potential accessed by the first input end or the second input end of the potential control unit according to the potential of the control end of the potential control unit. The first voltage reduction unit comprises a first capacitor and two resistor branches, wherein the first capacitor is connected between the output end of the first voltage reduction unit and the ground, and the two resistor branches are connected between the input end and the output end of the first voltage reduction unit in parallel; The leakage protection unit comprises a leakage protection chip, wherein an input pin of the leakage protection chip is connected with an input end of the leakage protection unit, a power supply pin of the leakage protection chip is connected with a power supply end of the leakage protection unit, an output pin of the leakage protection chip is connected with an output end of the leakage protection unit, and a grounding pin of the leakage protection chip is grounded; The potential control unit comprises a first transistor, a first resistor and a second capacitor, wherein the control electrode of the first transistor is connected with the control end of the potential control unit, the first electrode of the first transistor is connected with the second input end of the potential con