US 12,294,328 B2
Power conversion device
Fumihiro Sato, Tokyo (JP); Keisuke Tanabe, Tokyo (JP); Naoki Takata, Tokyo (JP); Daisuke Matsumoto, Tokyo (JP); Shigetoshi Yagihara, Tokyo (JP); and Masahiro Hiraga, Tokyo (JP)
Assigned to Hitachi Industrial Equipment Systems Co., Ltd., Tokyo (JP)
Appl. No. 18/013,942
Filed by Hitachi Industrial Equipment Systems Co., Ltd., Tokyo (JP)
PCT Filed Oct. 29, 2021, PCT No. PCT/JP2021/040173
§ 371(c)(1), (2) Date Dec. 30, 2022,
PCT Pub. No. WO2022/092304, PCT Pub. Date May 5, 2022.
Claims priority of application No. PCT/JP2020/041111 (WO), filed on Nov. 2, 2020.
Prior Publication US 2023/0291334 A1, Sep. 14, 2023
Int. Cl. H02P 3/18 (2006.01); H02M 1/00 (2006.01); H02M 5/458 (2006.01); H02P 3/22 (2006.01)
CPC H02P 3/22 (2013.01) [H02M 1/0009 (2021.05); H02M 5/4585 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A power conversion device that inputs AC voltage and outputs AC power, the device comprising:
a rectifying portion for rectifying an AC voltage and outputting a DC voltage;
a smoothing capacitor for smoothing the DC voltage;
an inverter portion into which the DC voltage is input and which outputs AC power;
an inverter drive portion for outputting a gate signal to the inverter portion;
a regenerative braking portion connected in parallel with the smoothing capacitor;
a regenerative braking drive portion for outputting a gate signal to the regenerative braking portion;
a control portion for outputting drive signals to the inverter drive portion and the regenerative braking drive portion;
a regenerative braking overcurrent detecting portion for outputting an overcurrent detection signal if the current flowing through the regenerative braking portion exceeds a determination value; and
a latch portion into which the overcurrent detection signal output from the regenerative braking overcurrent detecting portion is input and which outputs a gate output interruption signal to the control portion,
wherein switching elements of the inverter portion and the regenerative braking portion stop in an off state when the regenerative braking overcurrent detection portion detects an overcurrent.