Patent ID: 9219360
Filing Date: 2015-12-22
Classification: H02H

Abstract:
1. A safe quick disconnect leakage protector, comprising: a power supply circuit, configured for providing power to the leakage protector; a sampling circuit connected between a live wire and a neutral wire of an input terminal of an external power supply, for collecting a leakage current signal between the live wire and the neutral wire and outputting the leakage current signal; a main control circuit, configured for receiving the leakage current signal outputted from the sampling circuit, amplifying the leakage current signal, and outputting a grounding failure control signal when the leakage current reaches a predetermined value; a couple of single-pole single-throw switches, one of the single-pole single-throw switch being connected between the input terminal of the external power supply and the sampling circuit on the live wire, and the other one being connected between the input terminal of the external power supply and the sampling circuit on the neutral wire; an on and off control circuit, configured for receiving the grounding failure control signal outputted from the main control circuit and controlling the single-pole single-throw switches to disconnect the load from the external power supply according to the grounding failure control signal; and a testing circuit connected to the sampling circuit for providing a stimulated failure current signal to the sampling circuit to test whether the leakage protector work normally wherein the sampling circuit comprises a current transformer, a sampling capacitor, a first filter capacitor, and a current-voltage conversion resistor; the live wire and the neutral wire respectively pass through the current transformer or are respectively wrapped around the current transformer; a first end of the current transformer is connected to the testing circuit and a second end of the current transformer is connected to the main control circuit through the sampling capacitor; one end of the first filter capacitor is connected to a wire end of the second end of the current transformer and the other end of the first filter capacitor is grounded; and the current-voltage conversion resistor is connected between two wire ends of the second end of the current transformer in parallel.