US 12,244,230 B2
Switched-mode power supply and control circuit for use in switched-mode power supply
Danzhu Lv, Shanghai (CN)
Assigned to SHANGHAI BRIGHT POWER SEMICONDUCTOR CO., LTD., Shanghai (CN)
Filed by SHANGHAI BRIGHT POWER SEMICONDUCTOR CO., LTD., Shanghai (CN)
Filed on Dec. 6, 2022, as Appl. No. 18/075,607.
Claims priority of application No. 202111555380.1 (CN), filed on Dec. 17, 2021.
Prior Publication US 2023/0198399 A1, Jun. 22, 2023
Int. Cl. H02M 3/158 (2006.01); H02M 1/00 (2006.01); H02M 1/42 (2007.01)
CPC H02M 3/158 (2013.01) [H02M 1/0025 (2021.05); H02M 1/4258 (2013.01)] 12 Claims
OG exemplary drawing
 
1. A control circuit for use in a switched-mode power supply, the control circuit comprising:
an error amplifier (EA) module having an input terminal at which a feedback voltage is received and another input terminal at which a reference voltage is received, the EA module configured to output an EA signal;
a soft-start voltage generation module configured to produce a soft-start reference voltage of gradually increasing amplitude;
an amplitude limiter module configured to limit an amplitude of the EA signal based on the soft-start reference voltage; and
a pulse width modulation (PWM) comparator module having a first input terminal at which the amplitude-limited EA signal is received and a second input terminal at which a high-frequency signal is received, the PWM comparator module configured to output a PWM signal,
wherein the feedback voltage characterizes an output voltage, an output current or an output power of the switched-mode power supply, and the PWM signal is configured to control operation of the switched-mode power supply.