US 12,273,049 B2
Power conversion device
Ryo Gondo, Susono (JP); and Akinori Maruyama, Susono (JP)
Assigned to YAZAKI CORPORATION, Tokyo (JP)
Filed by YAZAKI CORPORATION, Tokyo (JP)
Filed on Feb. 21, 2023, as Appl. No. 18/172,304.
Claims priority of application No. 2022-036729 (JP), filed on Mar. 10, 2022.
Prior Publication US 2023/0291329 A1, Sep. 14, 2023
Int. Cl. H02M 7/5387 (2007.01); H02M 1/42 (2007.01)
CPC H02M 7/53871 (2013.01) [H02M 1/4233 (2013.01)] 3 Claims
OG exemplary drawing
 
1. A power conversion device comprising:
an inverter circuit configured to convert a DC voltage into an AC voltage and output the AC voltage to a load;
an AC current sensor configured to detect an AC current outputted from the inverter circuit;
an AC voltage sensor configured to detect the AC voltage outputted from the inverter circuit;
a DC voltage sensor configured to detect the DC voltage input to the inverter circuit; and
a control circuit configured to control the AC voltage based on the AC current detected by the AC current sensor, the AC voltage detected by the AC voltage sensor, and the DC voltage detected by the DC voltage sensor, wherein
the control circuit includes
an integration unit configured to integrate a difference between a predetermined overcurrent threshold and the AC current detected by the AC current sensor and output an integration output,
a multiplication unit configured to multiply the integration output outputted from the integration unit by the AC voltage detected by the AC voltage sensor and output a multiplication output,
a division unit configured to calculate and output a duty ratio by dividing the multiplication output outputted from the multiplication unit by the DC voltage detected by the DC voltage sensor, and
a voltage control unit configured to control the AC voltage according to the duty ratio outputted from the division unit.