US 12,355,360 B2
Alternating current power supply circuit, control method thereof, and alternating current power supply with an efficient soft switching circuit
Zhuyong Huang, Dongguan (CN); Xiaofei Zhang, Dongguan (CN); and Chuntao Zhang, Dongguan (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Oct. 28, 2022, as Appl. No. 17/976,579.
Application 17/976,579 is a continuation of application No. PCT/CN2021/074897, filed on Feb. 2, 2021.
Claims priority of application No. 202010367861.9 (CN), filed on Apr. 30, 2020.
Prior Publication US 2023/0053066 A1, Feb. 16, 2023
Int. Cl. H02M 5/458 (2006.01); H02M 1/00 (2007.01)
CPC H02M 5/4585 (2013.01) [H02M 1/0058 (2021.05)] 16 Claims
OG exemplary drawing
 
1. An alternating current power supply circuit, comprising:
a rectifier and an inverter, wherein:
the rectifier comprises a first inductor, a first branch, a second branch, a third branch, a first capacitor, and a second capacitor, a first end of the first inductor is connected to an input potential, a second end of the first inductor is connected to a common end of the first branch, the second branch, and the third branch, the other end of the first branch is connected to a first electrode of the first capacitor, the other end of the second branch is connected to a second electrode of the second capacitor, a second electrode of the first capacitor is connected to a first electrode of the second capacitor and is connected to a zero potential, the other end of the third branch is connected to a soft switching cell, the soft switching cell comprises a first switching component and a second switching component that are reversely connected in series, a first end of the soft switching cell is connected to a common end of the first capacitor and the second capacitor, a second end of the soft switching cell is configured to be connected to the third branch, and the first branch, the second branch, and the third branch form an I-type three-level topology or a T-type three-level topology;
the inverter comprises a second inductor, a fourth branch, a fifth branch, a sixth branch, the first capacitor, and the second capacitor, a first end of the second inductor is connected to an output potential, a second end of the second inductor is connected to a common end of the fourth branch, the fifth branch, and the sixth branch, the other end of the fourth branch is connected to the first electrode of the first capacitor, the other end of the fifth branch is connected to the second electrode of the second capacitor, the other end of the sixth branch comprises the soft switching cell, the soft switching cell is connected to the sixth branch by using the second end of the soft switching cell, and the fourth branch, the fifth branch, and the sixth branch form an I-type three-level topology or a T-type three-level topology; and
the first branch comprises a third switching component and a sixth switching component that are connected in series in a same direction, the second branch comprises a fourth switching component and a fifth switching component that are connected in series in a same direction, the third branch further comprises a first sub-branch and a second sub-branch that are connected in parallel, the first sub-branch comprises the fifth switching component and a first diode that are connected in series in a same direction, the second sub-branch comprises the sixth switching component and a second diode that are connected in series in a same direction, and the first sub-branch and the second sub-branch that are connected in parallel are connected to the soft switching cell in series.