Patent ID: 6160320
Filing Date: 2000-12-12
Classification: H02J

Abstract:
A method of controlling the load in an electric circuit by means of detecting the time state of same frequency of alternating current sine wave and alternating current square wave, the method comprising the steps of:i) picking up a half cycle wave signal from the waveform of the electric circuit;ii) shunting the half cycle wave signal thus obtained from step i), enabling the electric potential of the half cycle wave signal to be attenuated to a Predetermined intensity;iii) shaping the attenuated sine wave signal thus obtained from step ii) into a pulse wave, where a square wave pulse signal is obtained if the attenuated signal from step ii) is a square wave signal;iv) chopping the positive half cycle wave signal picked up from step i);v) shaping the chopped signal obtained from step iv) into square wave signal;vi) delaying the time series of the wave signal obtained from step iv), then comparing the rising edge of the wave signal thus obtained with the rising edge of the wave signal obtained from step iii), so as to botain a time difference;vii) controlling the load of the circuit by means of a first control mode if the voltage level of the time difference thus obtained from step vi) is at low potential, or by menas of a second control mode if the voltage level of the time difference thus obtained from step vi) is at high potential.