US 11,984,816 B2
Power conversion device and press apparatus
Mizuki Nakahara, Tokyo (JP); Hirooki Tokoi, Tokyo (JP); Kimihisa Furukawa, Tokyo (JP); and Yuki Kawaguchi, Tokyo (JP)
Assigned to Hitachi Industrial Equipment Systems Co., Ltd., Tokyo (JP)
Appl. No. 17/771,917
Filed by Hitachi Industrial Equipment Systems Co., Ltd., Tokyo (JP)
PCT Filed Apr. 16, 2020, PCT No. PCT/JP2020/016700
§ 371(c)(1), (2) Date Apr. 26, 2022,
PCT Pub. No. WO2021/090522, PCT Pub. Date May 14, 2021.
Claims priority of application No. 2019-201197 (JP), filed on Nov. 6, 2019.
Prior Publication US 2022/0385204 A1, Dec. 1, 2022
Int. Cl. H02M 7/219 (2006.01); B21D 37/00 (2006.01); B30B 15/00 (2006.01); B30B 15/14 (2006.01); H02M 1/00 (2006.01); H02M 5/44 (2006.01); H02M 7/25 (2006.01); H02P 27/06 (2006.01)
CPC H02M 7/25 (2013.01) [B21D 37/00 (2013.01); B30B 15/0041 (2013.01); B30B 15/148 (2013.01); H02M 1/0009 (2021.05); H02M 5/44 (2013.01); H02P 27/06 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A power conversion device including a voltage-doubling rectifier circuit,
wherein the voltage-doubling rectifier circuit includes:
a rectifier circuit configured to rectify, and thus, convert an input alternating-current voltage into a direct-current voltage;
a DC-link capacitor configured to include first and second capacitors that are connected in series between paired output nodes, and configured to, in a second rectification mode, retain the direct-current voltage substantially having a double voltage in a first rectification mode as an output voltage of the paired output nodes;
a switching element configured to, in the second rectification mode, connect a common connection node between the first and second capacitors to a predetermined node so that each of the first and second capacitors is individually charged;
a first current detector circuit configured to detect a switching current flowing in the switching element;
a second current detector circuit configured to detect a load current of a load connected to the paired output nodes; and
a controller circuit configured to, in a mode switching period from the first rectification mode to the second rectification mode, control the switching of the switching element, based on the switching current and the load current.