Power conversion device, image forming apparatus, and power conversion control method

A power conversion device comprising:

• a power conversion circuit configured to control a switching element based on a switching pulse signal to convert direct current power into alternating current power and output the alternating current power to a power supply target;
• a memory that stores an alternating current phase difference;
• a voltage detection circuit configured to detect an alternating current voltage effective value;
• a current detection circuit configured to detect an alternating current effective value;
• a control circuit configured to, based on the alternating current phase difference, the alternating current voltage effective value, and the alternating current effective value, stop output of the switching pulse signal at a time when an alternating current has a value of 0;
• a driver connected to a direct current power supply, and to drive the switching element based on the switching pulse signal;
• a smoothing circuit configured to smooth an output of the driver;
• and
• a transformer to convert and output a voltage of an output of the smoothing circuit.

A power conversion control method comprising:

• controlling a switching device based on a switching pulse signal to convert direct current power into alternating current power and output the alternating current power to a power supply target;
• storing an alternating current phase difference;
• detecting an alternating current voltage effective value;
• detecting an alternating current effective value;
• and
• based on the alternating current phase difference, the alternating current voltage effective value, and the alternating current effective value, stopping output of the switching pulse signal at a time when an alternating current has a value of 0;
• in response to an input of an update instruction, the method further comprising:
• calculating an active current value based on the alternating current effective value;
• calculating the alternating current phase difference based on the alternating current effective value and the active current value;
• and
• updating the stored alternating current phase difference with the calculated alternating current phase difference.