Sequential PE ground wire control circuit and method

Abstract

The invention discloses a sequential PE ground wire control circuit and method. The circuit comprises an MCU (IC1), a waterflow signal detection module connected with the MCU, an earth leakage protection chip (IC2) connected to the MCU (IC1) and controlled by the MCU (IC1), a zero sequence mutual inductor (ZCT1), a ground wire mutual inductor (ZZCT2), a display control module connected to the MCU (IC1), an E-N voltage detection module and a power module (IC5), and further comprises a relay control module (IC3) connected with the MCU (IC1) and relays (RL1, RL2 and RL3) which are connected to the relay control module (IC3) and receive sequential control signals of the relay control module; the RL3 is switched on before the RL1 and the RL2 are switched on; during release, the RL3 is released after the RL1 and the RL2 are released, the RL1 and the RL2 are the null wire relay and the live wire relay respectively, and the RL3 is the ground wire relay. The ground wire relay and the null and live wire relays adopt MCU sequential control, wherein the ground wire relay is switched on before the null and live wire relays are switched on and released after the null and live wire relays are released.

Description

Technical field [0001] The invention relates to a control circuit for a PE ground wire, in particular to a circuit and a control method for timing control of the PE ground wire. Background technique [0002] The existing control methods for disconnecting the ground wire are composed of a disconnection control structure that integrates a leakage protection plug, and because similar structures are composed of complex mechanical structures and circuit principles. The biggest potential failure of the complex mechanical structure is the wear of the mechanism or the jamming of the structure. The consequence is the unsafe hidden danger caused by the inability to trip correctly after the leakage. The circuit uses a resistor step-down to power the whole machine. The most unfavorable consequence of this power supply method is: continuous power on, the step-down resistance heats up, and the resistance is open in the state of the mechanical structure that has been energized and closed, which...

AI Technical Summary

Problems solved by technology

The biggest potential failure of a complex mechanical structure is mechanism wear or structural stagnation, resulting in unsafe hazards caused by failure to trip correctly after leakage

The circuit uses a resistance step-down to power the whole machine. The most unfavorable consequence of this power supply method is: continuous power on, the drop-down resistor heats up, and in the state of the mechanical structure that has been energized and closed, the whole machine will have no power supply after the resistance is opened. Power supply, the mechanical structure cannot be disconnected after electric leakage, thus causing electric shock accidents

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