US 12,231,063 B2
Power conversion device, control device for power conversion device, and power conversion control method
Yukihiro Nishikawa, Kodaira (JP); Masahito Shoyama, Fukuoka (JP); and Koki Hebishima, Fukuoka (JP)
Assigned to FUJI ELECTRIC CO., LTD., Kanagawa (JP); and KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION, Fukuoka (JP)
Filed by FUJI ELECTRIC CO., LTD., Kawasaki (JP); and KYUSHU UNIVERSITY, NATIONAL UNIVERSITY CORPORATION, Fukuoka (JP)
Filed on Dec. 27, 2022, as Appl. No. 18/088,963.
Application 18/088,963 is a continuation of application No. PCT/JP2021/044931, filed on Dec. 7, 2021.
Claims priority of application No. 2021-003242 (JP), filed on Jan. 13, 2021.
Prior Publication US 2023/0134040 A1, May 4, 2023
Int. Cl. H02M 7/537 (2006.01); H02M 1/08 (2006.01); H02M 3/335 (2006.01); H02M 1/42 (2007.01)
CPC H02M 7/537 (2013.01) [H02M 1/08 (2013.01); H02M 3/33507 (2013.01); H02M 1/42 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A power conversion device comprising:
an inverter unit that includes a switching element and converts input direct current (DC) power to output alternating current (AC) power;
a resonance circuit that includes a resonance capacitor connected in series to an output side of the inverter unit;
a transformer that transforms the AC power that is input from the inverter unit via the resonance circuit and outputs transformed AC power;
an output converter unit that converts the transformed AC power from the transformer into DC power and outputs the DC power; and
a control unit that controls a switching operation of the switching element of the inverter unit, wherein
the control unit is configured to switch between frequency modulation control for changing a switching frequency of the switching element and phase shift control for changing a phase difference in the switching operation of the switching element, based on an output from the output converter unit, and execute, and
when switching between the frequency modulation control and the phase shift control, execute overlap control for executing the phase shift control while executing the frequency modulation control, in a predetermined switching operation range.