US 12,316,229 B2
Voltage conversion circuit, charging apparatus, and electric device
Yuan Yao, Ningde (CN); Weichen He, Ningde (CN); Guiying Lin, Ningde (CN); Huaisen Zhang, Ningde (CN); Jinfeng Gao, Ningde (CN); and Yu Yan, Ningde (CN)
Assigned to CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed by CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED, Hong Kong (CN)
Filed on Mar. 21, 2023, as Appl. No. 18/187,112.
Application 18/187,112 is a continuation of application No. PCT/CN2022/095295, filed on May 26, 2022.
Claims priority of application No. 202111642182.9 (CN), filed on Dec. 29, 2021.
Prior Publication US 2023/0253886 A1, Aug. 10, 2023
Int. Cl. H02M 3/335 (2006.01); H02M 3/00 (2006.01)
CPC H02M 3/3353 (2013.01) [H02M 3/01 (2021.05)] 13 Claims
OG exemplary drawing
 
1. A voltage conversion circuit, comprising:
an N-level conversion unit, comprising N output terminals at different levels;
N−1 DC-DC conversion units, wherein a first input terminal of an Mth DC-DC conversion unit is connected to an Mth output terminal of the N-level conversion unit, a second input terminal of the Mth DC-DC conversion unit is connected to an (M+1)th output terminal of the N-level conversion unit, and an output level of the Mth output terminal and an output level of the (M+1)th output terminal are adjacent levels; and
a control unit connected to the N-level conversion unit and the N−1 DC-DC conversion units, wherein the control unit is configured to:
obtain an output voltage of each of the DC-DC conversion units, obtain a reference voltage based on the output voltages of the DC-DC conversion units, compare the output voltages of the DC-DC conversion units with the reference voltage one after another to obtain voltage differences each corresponding to one of the output voltages of the DC-DC conversion units, and control an intermediate output level of the N-level conversion unit based on the voltage differences; or
obtain an output current of each of the DC-DC conversion units, obtain a reference current based on the output currents of the DC-DC conversion units, compare the output currents of the DC-DC conversion units with the reference current one after another to obtain current differences each corresponding to one of the output currents of the DC-DC conversion units, and control the intermediate output level of the N-level conversion unit based on the current differences;
wherein N and M are positive integers and satisfy N≥3 and 1≤M<N.