Patent ID: 8472155

Claim:
A leakage detection protection circuit comprising: a power input end comprising: a live wire with an input end and an output end; and a neutral wire with an input end and an output end; a power output end comprising: a live wire; and a neutral wire; a pair of coils having a first side and a second side, the pair of coils comprising an induction coil configured to detect a leakage current and a self-excitation coil configured to detect a low resistance fault; a control chip; a controlled silicon rectifier comprising: a cathode; an anode; and a control pole; a commutation diode; a resistor; a current limiting resistor; a filter capacitor; a reset button; a test button; a first test switch comprising: a first end; and a second end; a second test switch comprising: a first end; and a second end; a tripping coil with a built-in iron core; and a pair of main circuit switches linked with the reset button; wherein: the test button is linked with the reset button, the first test switch is linked with the test button, the second test switch is linked with the reset button, the live wire and the neutral wire of the power input end both pass through the pair of coils so that the input end of the live wire and the input end of the neutral wire of the power input end are on the first side of the pair of coils and the output end of the live wire and the output end of the neutral wire of the power input end are on the second side of the pair of coils, the first end of the first test switch is electrically connected through the current limiting resistor to the input end of the neutral wire of the power input end, the second end of the first test switch is electrically connected to the first end of the second test switch, the second end of the second test switch is electrically connected to the output end of the live wire of the power input end, the leakage detection protection circuit is configured so that when the reset button is in a tripped state, the first test switch is in an open state and the second test switch is in a closed state, the leakage detection protection circuit is configured so that when the reset button is pressed down, the first test switch changes from the open state to a closed state, the second test switch remains in the closed state, and the input end of the neutral wire of the power input end is electrically connected to the output end of the live wire of the power input end to enable generation of an analog leakage current, and the leakage detection protection circuit is configured so that when the reset button is in a reset state, the first test switch and the second test switch are both open.