US 11,750,094 B2
Control circuit for a switching converter
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 Jul. 7, 2021, as Appl. No. 17/368,982.
Claims priority of application No. 202010756996.4 (CN), filed on Jul. 31, 2020.
Prior Publication US 2022/0038002 A1, Feb. 3, 2022
Int. Cl. H02M 3/156 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/1566 (2021.05) [H02M 1/0025 (2021.05)] 15 Claims
OG exemplary drawing
 
1. A control circuit for a switching converter, wherein:
a) the control circuit is configured to generate a switching control signal according to an output voltage of the switching converter to control a switching state of a power transistor in the switching converter, and to adjust an output current of the switching converter;
b) the control circuit is configured to adjust a length of a switching period of the power transistor opposite to a change trend of the output voltage, in order to maintain an average of the output current as constant;
c) the switching period comprises a first time interval and a second time interval; and
d) the control circuit is configured to generate a timing signal according to the output voltage and to adjust the second time interval by comparing the timing signal against a timing reference signal.