US 12,143,014 B2
Voltage converter having switched capacitor circuits
Huiqiang Chen, Hangzhou (CN); and Jianxin Wang, Hangzhou (CN)
Assigned to Silergy Semiconductor Technology (Hangzhou) LTD, Hangzhou (CN)
Filed by Silergy Semiconductor Technology (Hangzhou) LTD, Hangzhou (CN)
Filed on Feb. 1, 2022, as Appl. No. 17/590,128.
Claims priority of application No. 202110182208.X (CN), filed on Feb. 8, 2021.
Prior Publication US 2022/0255429 A1, Aug. 11, 2022
Int. Cl. H02M 3/158 (2006.01); H02M 3/07 (2006.01)
CPC H02M 3/158 (2013.01) [H02M 3/07 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A voltage converter, comprising:
a) an input end configured to receive an input voltage;
b) an output end configured to generate an output voltage;
c) N switched capacitor circuits sequentially coupled in series between the input end and the output end, wherein N is a positive integer greater than or equal to 2;
d) wherein each switched capacitor circuit comprises a switch circuit and a flying capacitor, and at least the flying capacitor of an i-th switched capacitor circuit is configured as an output capacitor of an (i−1)-th switched capacitor circuit, wherein i is a positive integer that is greater than or equal to 2 and less than or equal to N;
e) a first energy storage element coupled to the output end; and
f) wherein the switch circuit of the (i−1)-th switched capacitor circuit comprises three first power switches, wherein the first and second first power switches are sequentially connected in series between a high potential terminal and a low potential terminal of an input end of the (i−1)-th switched capacitor circuit, wherein one terminal of the third first power switch is coupled to the high potential terminal of the input end of the (i−1)-th switched capacitor circuit, and the other terminal of the third first power switch is coupled to one terminal of the flying capacitor of the (i−1)-th switched capacitor circuit, the other terminal of the flying capacitor of the (i−1)-th switched capacitor circuit is coupled to a common terminal of the first and second first power switches, and wherein the high potential terminal the output end of the (i−1)-th switched capacitor circuit is configured as a common terminal of the flying capacitor of the (i−1)-th switched capacitor circuit and the third first power switch.