US 11,909,301 B2
Switching power supply and intermittent power saving mode control circuit and method thereof
Zhan Chen, Hangzhou (CN); and Qiukai Huang, Hangzhou (CN)
Assigned to SILERGY SEMICONDUCTOR TECHNOLOGY (HANGZHOU) CO., LTD., Hangzhou (CN)
Filed by SILERGY SEMICONDUCTOR TECHNOLOGY (HANGZHOU) CO., LTD., Hangzhou (CN)
Filed on Sep. 14, 2021, as Appl. No. 17/474,671.
Claims priority of application No. 202010969223.4 (CN), filed on Sep. 15, 2020.
Prior Publication US 2022/0085710 A1, Mar. 17, 2022
Int. Cl. H02M 1/00 (2006.01)
CPC H02M 1/0035 (2021.05) [H02M 1/0025 (2021.05)] 20 Claims
OG exemplary drawing
 
1. An intermittent power saving mode control method, comprising:
controlling a switching power supply to operate alternately between a work mode and a sleep mode under a burst mode;
controlling the switching power supply to operate in the sleep mode according a first reference voltage, the first reference voltage is constant;
controlling the switching power supply to operate in the work mode according to a second reference voltage;
monitoring an alternating frequency of the switching power supply in the burst mode, wherein the alternating frequency is a frequency value that the switching power supply changes from a current work mode to a next work mode or from a current sleep mode to a next sleep mode, wherein in the work mode, a power switch of the switching power supply is periodically turned on and turned off and in sleep mode, the switching power supply remains off; and
adjusting the second reference voltage according to the alternating frequency, so that the alternating frequency is within a range of a first frequency to a second frequency.