US 12,283,885 B2
Switching converter with quasi-resonant control and control method thereof
Xuefeng Chen, Hangzhou (CN); and Hui Li, Hangzhou (CN)
Assigned to Hangzhou MPS Semiconductor Technology Ltd., Zhejiang (CN)
Filed by Hangzhou MPS Semiconductor Technology Ltd., Hangzhou (CN)
Filed on Sep. 29, 2022, as Appl. No. 17/956,396.
Claims priority of application No. 202111507178.1 (CN), filed on Dec. 10, 2021.
Prior Publication US 2023/0188033 A1, Jun. 15, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. H02M 3/335 (2006.01); H02M 1/00 (2007.01); H02M 3/156 (2006.01)
CPC H02M 3/156 (2013.01) [H02M 1/0006 (2021.05); H02M 1/0025 (2021.05); H02M 3/33507 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A controller used in a switching converter having a first switch and an energy storage component coupled to the first switch, the controller comprising:
a hysteresis feedback circuit configured to generate a hysteresis feedback signal based on an output feedback signal indicative of an output signal of the switching converter;
a first comparison circuit configured to compare the hysteresis feedback signal with a ramp signal and generate a first comparison signal;
a second comparison circuit configured to compare the output feedback signal with the ramp signal and generate a second comparison signal;
a valley detection circuit configured to provide a valley pulse signal in response to one or more valleys of a voltage drop across the first switch during an OFF state of the first switch; and
a turn-on control circuit configured to generate a target locked valley number based on the valley pulse signal, the first comparison signal, the second comparison signal and a current locked valley number, and further configured to generate a turning on control signal corresponding to the target locked valley number for turning ON the first switch.