Patent ID: 6137242
Filing Date: 2000-10-24
Classification: H05B,Y02B

Abstract:
A circuit for regulating power supplied to a load from an input AC power source according to an open-circuit time of the input AC power source, comprising:a microprocessor;a memory connected to the microprocessor;a rectification circuit with an input end connected to a power source for changing an AC signal of said power source into a full wave power source signal;a voltage dividing circuit with an input end connected to an output end of said rectification circuit and an output end connected to an input end of said microprocessor for voltage dividing said full wave power source signal and supplying the voltage divided full wave power source signal to said microprocessor;a trigger circuit having a trigger signal input connected to an output end of said microprocessor and an output end connected to a load, said trigger circuit being arranged to control supply of power to the load in response to a trigger signal supplied by said microprocessor;a control switch connected between said rectification circuit and said power source; anda power storage device with one end connected to said control switch, a power source end of said microprocessor, and a power source end of said memory for respectively supplying power to said microprocessor and to said memory whether or not said control switch is open;wherein when said control switch is opened, no voltage is input to said input end of said rectification circuit, and said input end of said microprocessor is unable to detect the voltage divided full wave power source signal, andwherein said microprocessor determines the open-circuit time during which said voltage divided power source signal is not detected and, based on said open-circuit time, controls said trigger signal.