Patent ID: 6160439
Filing Date: 2000-12-12
Classification: G05F

Abstract:
A current feed control circuit of an electronic appliance comprising a current receiving element, a bidirectional three-terminal thyristor placed in the current travelling route of said current receiving element, a series connection circuit of a first capacitor as power source of control and a first diode connected parallel to said bidirectional three-terminal thyristor, a constant voltage element having a cathode connected to the gate of said bidirectional three-terminal thyristor, and a control circuit connected parallel to said first capacitor, with its control terminal connected to the gate of said bidirectional three-terminal thyristor, wherein power from an alternating power supply having both a positive cycle and a negative cycle is coupled to said current receiving element under control of said control circuit, said control circuit controlling the coupling of said power to said receiving element in response to a sensed parameter of said receiving element.