POWER SUPPLY DEVICE AND IMAGE FORMING APPARATUS EQUIPPED WITH POWER SUPPLY DEVICE

摘要

PROBLEM TO BE SOLVED: To provide a power supply device using a piezoelectric transformer which suppresses interference between driving frequencies and achieves downsizing and the enhancement of picture quality.

SOLUTION: The power supply device includes multiple power supply circuits each having a piezoelectric transformer and a voltage controlled oscillator that generates a signal of the driving frequency of the piezoelectric transformer according to a control signal. When voltages are outputted from at least one power supply circuit and another power supply circuit, the voltage controlled oscillator of the one power supply circuit is so controlled that it generates a signal of a frequency not approximate to the frequency of a signal outputted from the voltage controlled oscillator of the other power supply circuit.

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