Patent ID: 6984810
Filing Date: 2006-01-10
Classification: G03G,Y10S

Abstract:
1. A heater control apparatus configured and arranged to be operable by an alternating current having one of a plurality of frequencies, comprising: a zero-cross point detector configured to detect a zero-cross point of a voltage waveform of the alternating current from an electric power source coupled to supply power to a heater and to generate a zero-cross signal based on the detected zero cross point; a frequency detector configured to detect an actual frequency of the alternating current of the power source based upon the zero-cross signal; and a control part configured to control electric power being supplied to the heater, wherein, at a time of initially supplying power to the heater, the control part provides initial control based on a tentatively determined frequency of the alternating current corresponding to one of the plurality of frequencies until the frequency detector detects the actual frequency of the alternating current based upon the zero-cross signal to then control the electric power supplied to said heater based on the actual frequency of the alternating current detected by the frequency detector.