US 12,334,813 B2
Rectification control system, charger and control method for charger
Lijun Zhang, Qingdao (CN); Xuqiang Zhao, Qingdao (CN); Haiyang Li, Qingdao (CN); Bowei Zhu, Qingdao (CN); Zhuangzhuang Shen, Qingdao (CN); Xiantao Chu, Qingdao (CN); Long Li, Qingdao (CN); and Maoqun Zhou, Qingdao (CN)
Assigned to CRRC QINGDAO SIFANG ROLLING STOCK RESEARCH INSTITUTE CO., LTD., Qingdao (CN)
Filed by CRRC QINGDAO SIFANG ROLLING STOCK RESEARCH INSTITUTE CO., LTD., Qingdao (CN)
Filed on Jan. 6, 2025, as Appl. No. 19/011,342.
Application 19/011,342 is a continuation of application No. PCT/CN2023/126780, filed on Oct. 26, 2023.
Claims priority of application No. 202311270828.4 (CN), filed on Sep. 27, 2023.
Prior Publication US 2025/0141343 A1, May 1, 2025
Int. Cl. H02M 1/32 (2007.01); H02M 1/10 (2006.01); H02M 7/219 (2006.01)
CPC H02M 1/325 (2021.05) [H02M 1/10 (2013.01); H02M 7/219 (2013.01)] 9 Claims
OG exemplary drawing
 
1. A rectification control system, comprising:
a Vienna rectifier, which comprises:
three input terminals, namely a u terminal, a v terminal and a w terminal;
two output terminals, namely a dc+ terminal and a dc− terminal;
an output capacitor circuit, coupled between the two output terminals, the output capacitor circuit comprising a first capacitor C1 and a second capacitor C2 connected in series and an intermediate node located between the first capacitor C1 and the second capacitor C2;
a rectifying circuit, comprising three bridge arm branches, namely a u-phase bridge arm branch connected between the u terminal and the intermediate node, a v-phase bridge arm branch connected between the v terminal and the intermediate node, and a w-phase bridge arm branch connected between the w terminal and the intermediate node, each of the bridge arm branches comprising a switch device and a bidirectional switch unit connected in series;
a voltage acquisition unit, connected to the three input terminals and configured to acquire a voltage Ugy between the u terminal and the v terminal, a voltage Uvw between the v terminal and the w terminal, and a voltage Uwu between the w terminal and the u terminal;
a fault detection unit, connected to bidirectional switch units and configured to detect whether any of the bidirectional switch units fails;
a control unit, connected to the voltage acquisition unit and the fault detection unit, and configured to determine a voltage input format and a voltage connection scheme according to voltages acquired by the voltage acquisition unit, and control closing or opening of three switch devices to switch circuit and operating mode according to the voltage input format, the voltage connection scheme and a detection result of the fault detection unit;
wherein the control unit is further configured to:
when the voltages Uuv, Uvw and Uwu acquired by the voltage acquisition unit are all AC voltages, determine the voltage input format as three-phase AC input;
when only one of the voltages Uuv, Uvw and Uwu acquired by the voltage acquisition unit is an AC voltage, determine the voltage input format as single-phase AC input;
when only one of the voltages Uuv, Uvw and Uwu acquired by the voltage acquisition unit is a DC voltage, determine the voltage input format as DC input.