US 11,757,287 B2
Voltage conversion circuit and power supply system
Wanyuan Qu, Hangzhou (CN); Fangcheng Liu, Shanghai (CN); Lei Shi, Shanghai (CN); and Wuhua Li, Hangzhou (CN)
Assigned to Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed by Huawei Digital Power Technologies Co., Ltd., Shenzhen (CN)
Filed on Mar. 3, 2022, as Appl. No. 17/686,163.
Claims priority of application No. 202110234843.8 (CN), filed on Mar. 3, 2021.
Prior Publication US 2022/0285947 A1, Sep. 8, 2022
Int. Cl. H02J 3/38 (2006.01); H02M 1/00 (2006.01); H02M 3/156 (2006.01)
CPC H02J 3/381 (2013.01) [H02M 1/0095 (2021.05); H02M 3/156 (2013.01); H02J 2300/26 (2020.01)] 20 Claims
OG exemplary drawing
 
1. A voltage conversion circuit, comprising:
an inductor;
a first switch module;
N second switch modules connected in series;
N third switch modules connected in series; and
N−1 flying capacitors, wherein N is an integer greater than or equal to 2;
wherein one terminal of the first switch module is separately connected to one terminal of the N second switch modules connected in series and one terminal of the N third switch modules connected in series, the other terminal of the N third switch modules connected in series is connected to a positive electrode of a high-voltage power supply, the other terminal of the first switch module and the other terminal of the N second switch modules connected in series are connected to a negative electrode of the high-voltage power supply, and a low-voltage power supply is connected to the two terminals of the first switch module through the inductor;
wherein one terminal of an ith flying capacitor in the N−1 flying capacitors is connected to a connection point between an ith second switch module and an (i+1)th second switch module, the other terminal of the ith flying capacitor is connected to a connection point between an ith third switch module and an (i+1)th third switch module, and i is an integer greater than or equal to 1 and less than or equal to N−1;
wherein in one switching period, the circuit performs boost conversion on a voltage output by the low-voltage power supply, by using at least one flying capacitor charging mode and a boost discharging mode; and
wherein at least one flying capacitor comprises a plurality of flying capacitors, the plurality of flying capacitors are connected in parallel in each flying capacitor charging mode and the boost discharging mode.