Patent ID: 7859816

Claim:
A bistable contactor drive circuit, comprising a first relay (K 1 ), a second relay (K 2 ), a bistable contactor (K 3 ), a seventh diode (D 7 ), an eighth diode (D 8 ) and a delay circuit (A); a series branch comprising said first relay (K 1 ) coil and a control signal source (SIGNAL) connected to a DC power supply; a third normally closed contact (K 1 - 3 ) and an eighth normally opened contact (K 1 - 8 ) of said first relay (K 1 ) connected to a positive electrode of the power supply, a first normally opened contact (K 1 - 1 ) and a sixth normally closed contact (K 1 - 6 ) connected to a negative electrode of the power supply, a second movable contact (K 1 - 2 ) connected to a positive electrode of said bistable contactor (K 3 ) coil, and a seventh movable contact (K 1 - 7 ) thereof connected to a seventh movable contact (K 2 - 7 ) of said second relay (K 2 ); a negative electrode of said bistable contactor (K 3 ) coil connected to a second movable contact (K 2 - 2 ) of said second relay (K 2 ); a third normally closed contact (K 2 - 3 ) of said second relay (K 2 ) connected to a cathode of the seventh diode (D 7 ), a sixth normally closed contact (K 2 - 6 ) thereof connected to an anode of the seventh diode (D 7 ), a first normally opened contact (K 2 - 1 ) thereof connected to an anode of the eighth diode (D 8 ), an eighth normally opened contact (K 2 - 8 ) thereof connected to a cathode of the eighth diode (D 8 ); a sampling end (a) of said delay circuit (A) connected to the seventh movable contact (K 1 - 7 ) of the first relay (K 1 ), and an output end (c) thereof connected to one end of said second relay (K 2 ) coil; the other end of said second relay (K 2 ) coil connected to the negative electrode of the power supply.