US 12,308,742 B2
Controller, switched-mode power supply and method for controlling 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. 20, 2022, as Appl. No. 18/084,690.
Claims priority of application No. 202111630544.2 (CN), filed on Dec. 28, 2021.
Prior Publication US 2023/0208302 A1, Jun. 29, 2023
Int. Cl. H02M 3/158 (2006.01); H02M 1/08 (2006.01)
CPC H02M 3/158 (2013.01) [H02M 1/08 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A controller for a switched-mode power supply, the switched-mode power supply comprising at least one power switching element and an energy storage element, wherein the at least one power switching element is switchable to feed an input DC voltage to the energy storage element, wherein the controller comprises:
a sampling and feedback unit, configured to obtain a first ramp signal reflecting an energy variation of the energy storage element, wherein the sampling and feedback unit comprises a resistor divider circuit and a filter circuit, wherein the resistor divider circuit is coupled to a first end of the energy storage element to obtain a voltage signal at the first end of the energy storage element, and wherein the voltage signal is transmitted through the filter circuit to produce the first ramp signal; and
a ramp compensation unit, configured to receive the first ramp signal and to produce a second ramp signal,
wherein the second ramp signal is produced based on the first ramp signal, wherein a difference between the second ramp signal and the first ramp signal is lower than a predetermined value, and wherein the controller controls an operation of the at least one power switching element based on the difference between the first and second ramp signals.