US 12,294,311 B2
Auxiliary pre-charging device of power converter, pre-charging method and power converter
Jianxiong Yu, Shanghai (CN); Jiajie Duan, Shanghai (CN); Han Li, Shanghai (CN); Cheng Luo, Shanghai (CN); and Qiang Chen, Shanghai (CN)
Assigned to Eaton Intelligent Power Limited, Dublin (IE)
Filed by Eaton Intelligent Power Limited, Dublin (IE)
Filed on Nov. 23, 2021, as Appl. No. 17/534,176.
Claims priority of application No. 202011336465.6 (CN), filed on Nov. 25, 2020.
Prior Publication US 2022/0302848 A1, Sep. 22, 2022
Int. Cl. H02M 1/36 (2007.01); H02M 5/458 (2006.01)
CPC H02M 5/4585 (2013.01) [H02M 1/36 (2013.01)] 7 Claims
OG exemplary drawing
 
1. An auxiliary pre-charging device for a power converter that comprises at least one power unit with an input connected to an AC power source and an output connected to a DC bus, the at least one power unit comprising an AC/DC converter and a bidirectional DC/DC converter connected in series between the input and the output of the at least one power unit, and the auxiliary pre-charging device comprising: a switch, a transformer, a resistor, and a rectifier connected in series, wherein a first terminal of the switch is configured to be connected to the AC power source and wherein an output of the rectifier is configured to be connected to the DC bus, wherein the DC bus connected to the output of the power unit is identical to the DC bus connected to the rectifier.