US 12,244,214 B2
Single-phase and three-phase compatible ac-dc conversion circuit and method of detecting input current thereof
Cheng-Te Li, Taoyuan (TW); Nian-Ci Chen, Taoyuan (TW); Chih-Yuan Chuang, Taoyuan (TW); and Cheng-Hao Hsueh, Taoyuan (TW)
Assigned to DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed by DELTA ELECTRONICS, INC., Taoyuan (TW)
Filed on Apr. 6, 2022, as Appl. No. 17/714,841.
Claims priority of application No. 202110870043.5 (CN), filed on Jul. 30, 2021.
Prior Publication US 2023/0035838 A1, Feb. 2, 2023
Int. Cl. H02M 1/00 (2007.01); H02M 1/10 (2006.01); H02M 1/32 (2007.01); H02M 1/42 (2007.01); H02M 7/219 (2006.01); H02M 1/36 (2007.01)
CPC H02M 1/0009 (2021.05) [H02M 1/10 (2013.01); H02M 1/32 (2013.01); H02M 1/4216 (2013.01); H02M 1/4233 (2013.01); H02M 7/219 (2013.01); H02M 1/36 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A single-phase and three-phase compatible AC-DC conversion circuit with input current detection, disposed between an AC side and a DC side, the AC side comprising a three-phase power source, the AC-DC conversion circuit comprising:
a first inductor, a second inductor, and a third inductor,
a switch bridge arm assembly, comprising:
three switch bridge arms, each of the switch bridge arms comprising an upper switch and a lower switch connected in series; a plurality of common-connected nodes between the upper switches and the corresponding lower switches respectively coupled to the three-phase power source through the first inductor, the second inductor, and the third inductor,
a fifth switching component, coupled between a first phase of the three-phase power source and the common-connected node of the switch bridge arm corresponding to a third phase of the three-phase power source,
a pre-charge resistor, coupled between the firth phase and the first inductor,
a capacitor assembly, coupled to the switch bridge arm assembly in parallel to form the DC side, and
a control unit, configured to turn on the upper switch of the switch bridge connected to the first inductor, the lower switch of the switch bridge connected to the third inductor, and the fifth switching component to provide a current detection loop having the first inductor, the third inductor, and the fifth switching component,
wherein the control unit acquires a magnitude of a first current flowing through the first inductor and a magnitude of a third current flowing through the third inductor, and determines whether a current detection mechanism of the first current and the third current is normal.