US 12,244,246 B2
Power conversion device, image forming apparatus, and power conversion control method
Tsuyoshi Mano, Tokyo (JP); and Junpei Hosoya, Kanagawa (JP)
Assigned to RICOH COMPANY, LTD., Tokyo (JP)
Filed by Tsuyoshi Mano, Tokyo (JP); and Junpei Hosoya, Kanagawa (JP)
Filed on Mar. 17, 2023, as Appl. No. 18/122,727.
Claims priority of application No. 2022-046578 (JP), filed on Mar. 23, 2022.
Prior Publication US 2023/0308031 A1, Sep. 28, 2023
Int. Cl. H02M 7/538 (2007.01); H02M 1/00 (2006.01); H02M 1/04 (2006.01)
CPC H02M 7/53803 (2013.01) [H02M 1/0009 (2021.05); H02M 1/0012 (2021.05); H02M 1/042 (2013.01)] 13 Claims
OG exemplary drawing
 
1. 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; and
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, and
in response to an input of an update instruction,
calculate an activate current value based on the alternating current effective value,
calculate the alternating current phase difference based on the alternating current effective value and an active current value, and
update the alternating current phase difference in the memory with the calculated alternating current phase difference.