US 12,424,942 B2
Voltage converter and a power supply control circuit thereof
Hui Li, Hangzhou (CN); and Siran Wang, Hangzhou (CN)
Assigned to Chengdu Monolithic Power Systems Co., Ltd., Sichuan (CN)
Filed by Chengdu Monolithic Power Systems Co., Ltd., Chengdu (CN)
Filed on Dec. 7, 2022, as Appl. No. 18/076,608.
Claims priority of application No. 202210081397.6 (CN), filed on Jan. 24, 2022.
Prior Publication US 2023/0238889 A1, Jul. 27, 2023
Int. Cl. H02M 1/36 (2007.01); H02M 1/08 (2006.01); H02M 3/335 (2006.01)
CPC H02M 3/33507 (2013.01) [H02M 1/08 (2013.01); H02M 1/36 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A voltage converter for converting an input voltage to an output voltage, comprising:
a power control chip;
a power supply capacitor, having a charging terminal configured to provide a power supply voltage to power the power control chip;
a charging switch, coupled between the input voltage and the charging terminal of the power supply capacitor, wherein the charging switch has a control terminal configured to receive a charging control signal; and
a charging control circuit, configured to provide the charging control signal to control the charging switch based on the input voltage and a compensation signal, and the compensation signal is refreshed when the input voltage decreases to a voltage threshold, wherein the power supply capacitor is coupled to the input voltage when the charging switch is on.