Quick-action leakage detection protection circuit having regular self-checking function

A quick-action leakage detection protection circuit with a regular self-checking function, comprising:

• a power input end;
• a power load end;
• a power user end;
• twin induction coils for detecting leakage current and low resistance failure,
• a control chip;
• a trip coil in which an iron core is disposed;
• a reset button;
• a self-checking chip;
• and
• a self-checking silicon controlled rectifier,
• wherein:
• the reset button is linked with a main circuit switch, an analog path switch, and a normally-open self-checking path switch;
• the analog path switch comprises a front-end normally-open switch and a rear-end normally-open switch;
• the front-end normally-open switch is connected between a live line end of the power input end and a first end of the trip coil;
• the rear-end normally-open switch is connected between a neutral line end of the power input end passing through the twin induction coils and a second end of the trip coil;
• the front-end normally-open switch and the rear-end normally-open switch contact and close when the reset button is pressed down so that the trip coil forms a return circuit passing through the twin induction coils,
• a first end of the self-checking path switch is connected to a live line end of the power input end;
• a second end of the self-checking path switch is grounded through the self-checking silicon controlled rectifier;
• the self-checking path switch is closed when the quick-action leakage detection protection circuit is in a working, reset state;
• the main circuit switch comprises a pair of dynamic contact levers extended from the power load end, a first pair of static contact ends extended from the power input end passing through the twin induction coils, and a second pair of static contact ends extended from the power user end;
• the pair of dynamic contact levers and the first pair of static contact ends respectively form a first set of normally-open switches which are closed when the quick-action leakage detection protection circuit is in the working, reset state;
• the pair of dynamic contact levers and the second pair of static contact ends respectively form a second set of normally-open switches which are closed when the quick-action leakage detection protection circuit is in the working, reset state;
• the pair of dynamic contact levers are further provided with an elastic reset mechanism and a pair of elevating contact levers;
• each elevating contact lever contacts a corresponding dynamic contact lever in a resting state and separates from its corresponding dynamic contact lever when the corresponding dynamic contact lever acts;
• a first static contact lever of a pair of static contact levers extends from a live line end of the power input end;
• a second static contact lever of the pair of static contact lever extends from a live line end of the power user end;
• a live line elevating contact lever of the pair of elevating contact levers and the second static contact lever are always conductively connected,
• a first normally-closed switch is formed through a live line dynamic contact lever of the pair of dynamic contact levers so that a live line end of the power load end and the live line end of the power user end are connected together when the first normally-closed switch is closed;
• and
• in a reversed connection, the live line elevating contact lever and the first static contact lever are conductively connected and the live line elevating contact lever separates from the live line dynamic contact lever so that the live line end of the power user end and the live line end of the power input end are connected together.