Patent ID: 8891985
Filing Date: 2014-11-18
Classification: G03G,H02M

Abstract:
1. A bias power supply device comprising: a temperature detecting unit that measures a temperature; a control signal generation unit that generates and outputs an output frequency setting signal and a resonance frequency signal, the output frequency setting signal setting a frequency of an alternating current power in accordance with a repetition frequency, and the resonance frequency signal, in a case where the temperature measured by the temperature detecting unit corresponds to a higher temperature range of at least two predetermined temperature ranges, being set at a repetition frequency lower than a repetition frequency in a case of the measured temperature corresponding to a lower temperature range, and in a case where the temperature measured by the temperature detecting unit corresponds to the lower temperature range, being set at a repetition frequency higher than a repetition frequency in a case of the measured temperature corresponding to a higher temperature range; a waveform signal generation circuit that generates a waveform signal to be used for pulse-width modulation, in which a time constant for rising is set by capacity and resistance based on the resonance frequency signal; a modulation circuit that generates a modulation signal having been pulse-width modulated based on the waveform signal and the output frequency setting signal; a switching circuit that is driven based on the modulation signal; and a transformer provided with a first winding and a second winding, in which the switching circuit is connected to the first winding and a load provided outside is connected to the second winding, the transformer supplying an alternating current power with a repetition frequency of the output frequency setting signal to the load through the second winding.