CPC G03G 15/5004 (2013.01) [G03G 15/205 (2013.01); H05B 3/0066 (2013.01); G03G 2215/2038 (2013.01)] | 5 Claims |
1. A power control device comprising:
a heater configured to generate heat by being supplied with an AC voltage;
a zero-cross detecting unit configured to detect a zero-cross point of the AC voltage;
a triac configured to switch a conduction state in which the AC voltage is supplied to the heater and a non-conduction in which supply of the AC voltage to the heater is cut off;
a supplying unit configured to supply a current to the triac; and
a controlling unit configured to control a state of the triac by outputting a control signal,
wherein the controlling unit controls the state of the triac by outputting the control signal in a control period in which a plurality of half-waves of the AC voltage with a first polarity and a plurality of half-waves of the AC voltage with a second polarity different from the first polarity constitute one period of control,
wherein an electric charge of the supplying unit is discharged when the control signal is outputted in the half-wave of each of the first polarity and the second polarity and is charged when the control signal is not outputted in the half-wave of the first polarity, and
wherein in a case that a single zero-cross point is detected by the zero-cross detecting unit in a first half-wave, a single control signal is outputted in a second half-wave after the first half-wave, and
wherein in a case that a plurality of zero-cross points are detected by the zero-cross detecting unit in the first half-wave, a plurality of control signals are outputted in the second half-wave.
|