A self-resetting overvoltage and undervoltage protector with leakage protection function

Abstract

A self-resetting overvoltage and undervoltage protector with leakage protection function, which includes a box body and a control unit, and the control unit includes a power supply circuit (1), a current sampling circuit (2), a voltage sampling circuit (3), and a microprocessor ( 4), button processing circuit (5), working state indication circuit (6), magnetic relay drive circuit (7), magnetic latching relay (8), leakage transformer (9), energy storage capacitor (10) and chip peripheral circuit (11), a self-resetting overvoltage and undervoltage protector with leakage protection function provided by the present invention, after the overvoltage and undervoltage protection action, when the power supply voltage returns to the normal voltage range, the power supply is automatically turned on to ensure the continuity of power supply It ensures the quality of power supply; after the leakage protection action, after troubleshooting the fault and confirming with the manual button, it will automatically turn on the power supply, ensuring the continuity of power supply and protecting personal safety.

Description

technical field [0001] The invention belongs to the technical field of low-voltage electrical appliances, and specifically relates to a self-resetting overvoltage and undervoltage protector with leakage protection function. Background technique [0002] In the field of low-voltage electrical appliances, overvoltage and undervoltage of single-phase power supply often occur, resulting in damage to various electrical appliances, or personal injury due to leakage. In order to avoid the occurrence of this safety accident, a protection device is installed in the circuit of the low-voltage electrical appliance. When the power supply line has overvoltage or undervoltage, the protection device can quickly and safely cut off the circuit under continuous high-voltage impact to avoid abnormal voltage from being sent Terminal electrical appliances cause accidents. When the voltage returns to the normal value, the protector will automatically connect the circuit within the specified time ...

AI Technical Summary

Problems solved by technology

[0002] In the field of low-voltage electrical appliances, single-phase power supply overvoltage and undervoltage often occur, resulting in damage to various electrical appliances, or personal injury due to leakage

In order to avoid the occurrence of this safety accident, a protection device is installed in the circuit of the low-voltage electrical appliance. When the power supply line has overvoltage or undervoltage, the protection device can quickly and safely cut off the circuit under continuous high-voltage impact to avoid abnormal voltage from being sent Terminal electrical appliances cause accidents. When the voltage returns to the normal value, the protector will automatically connect the circuit within the specified time to ensure the normal operation of terminal electrical appliances under unattended conditions. At present, there are three types of such protection devices: one is The neutral line disconnection protector uses the cooperation of the release and the relay to realize the overvoltage and undervoltage protection function. The second type is a circuit breaker with leakage and undervoltage protection. Although this type of protector has the functions of leakage protection and overvoltage and undervoltage protection, it cannot automatically recover after power failure due to the overvoltage and undervoltage protection action. It is inconvenient for the user to close the switch manually, which affects the continuity of power supply; the third is the self-resetting over-voltage and under-voltage protector using ordinary relays, which does not have leakage protection function. Although it can achieve self-resetting function, due to the use of ordinary relays, The rated operating current can only be 40A or less. If the relay is energized for a long time, the power consumption will be large, the temperature will rise, and the reliability will be poor.

[0003] Chinese Patent No. 200920159472.6 discloses a self-resetting overvoltage and undervoltage protector for lighting systems. Its control circuit consists of a power supply circuit, a voltage sampling circuit, a It is composed of filtering capacitors, adopts microprocessor voltage detection and control, simple adjustment of operating voltage value and delay time, high precision, and effectively protects subsequent electrical appliances from overvoltage or undervoltage damage. Magnetic latching relays are used as actuators. Low power consumption, energy saving and environmental protection, and has an automatic reset function, but this technology has no leakage protection function, which is prone to safety accidents

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