US 12,445,034 B2
Power supply system and operating method thereof
Shan-Cheng Hsu, Hsin-Chu (TW); Tung-Min Lee, Hsin-Chu (TW); and Ying-Chieh Yeh, Hsin-Chu (TW)
Assigned to Coretronic Corporation, Hsin-Chu (TW)
Filed by Coretronic Corporation, Hsin-Chu (TW)
Filed on Aug. 31, 2022, as Appl. No. 17/900,839.
Claims priority of application No. 202111149522.4 (CN), filed on Sep. 29, 2021.
Prior Publication US 2023/0098886 A1, Mar. 30, 2023
Int. Cl. H02M 1/32 (2007.01); H02J 9/00 (2006.01); H02M 1/00 (2006.01)
CPC H02M 1/0032 (2021.05) [H02J 9/005 (2013.01); H02M 1/322 (2021.05)] 8 Claims
OG exemplary drawing
 
1. A power supply system, comprising:
a power generation circuit, having an output end, and configured to provide an output voltage at the output end in a power-on state, and stop providing the output voltage in a power-off state; and
a discharge circuit, coupled to the output end and having a detection end, wherein the discharge circuit comprises:
a capacitor, coupled between the detection end and a reference ground;
a comparison circuit, coupled to the detection end and the output end, and configured to compare a voltage at the detection end and the output voltage at the output end to generate a comparison result; and
a switch circuit, coupled to the comparison circuit and the output end, and configured to discharge the output end according to the comparison result in the power-off state,
wherein the discharge circuit further comprises:
a first resistor, coupled between the output end and the comparison circuit;
a second resistor, coupled between the comparison circuit and the switch circuit; and
a third resistor, coupled between the output end and the switch circuit,
wherein the comparison circuit comprises:
a first transistor, comprising a first end coupled to the detection end, a second end coupled to the first resistor, and an output end coupled to the second resistor,
wherein the switch circuit comprises:
a second transistor, comprising a first end coupled to the reference ground, a second end coupled to the second resistor, and an output end coupled to the third resistor.