Voltage generation device, power control device, image forming apparatus, and control method

A power control device for controlling a power supply device including a direct-current power supply and an alternating-current power supply connected to the direct-current power supply, to generate a voltage in which an alternating-current voltage is superimposed on a direct-current voltage and to apply the voltage to a rotary body, the power control device comprising:

• a variation phase determiner configured to determine whether variation of an output voltage of the alternating-current power supply and variation of an output current of the alternating-current power supply are in opposite phases;
• and
• a voltage controller configured to perform gain correction for the output voltage in a case where the variation of the output voltage and the variation of the output current are in opposite phases.

A method for controlling a power supply device including a direct-current power supply and an alternating-current power supply connected to the direct-current power supply, to generate a voltage in which an alternating-current voltage is superimposed on a direct-current voltage and to apply the voltage to a rotary body, the method comprising:

• determining whether variation of an output voltage of the alternating-current power supply and variation of an output current of the alternating-current power supply are in opposite phases;
• and
• performing gain correction for the output voltage in a case where the variation of the output voltage and the variation of the output current are in opposite phases.