IP Library › Granted Patent US 12,712,452
Granted Patent B2
US 12,712,452 · App. 18/321,464 · Granted Aug 18, 2026

Switching converter with overshoot suppression and control method thereof

Inventors: Keke Zhao (Hangzhou, CN); Wangmiao Hu (Hangzhou, CN); Ting Ma (Hangzhou, CN); Gang Yan (Hangzhou, CN); Lijie Jiang (Hangzhou, CN); Fangyu Zhang (Hangzhou, CN); Huichun Dai (Hangzhou, CN)
Assignee: Chengdu Monolithic Power Systems Co., Ltd.
H02M3/1566
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Quick Facts
Patent No.
US 12,712,452
App. No.
18/321,464
Granted
Aug 18, 2026
Kind
B2
Abstract

A controller used in a switching converter having a switch and converting an input voltage into an output voltage having a transient profile. The controller includes a transient sensing circuit, a mode determining circuit and an on time regulating circuit. The transient sensing circuit generates a transient voltage signal indicative of the transient profile of the output voltage. The mode determining circuit receives the transient voltage signal and a first feedback voltage signal indicative of the output voltage, and generates a mode signal based on a first comparison between the first feedback voltage signal and a first threshold voltage and a second comparison between the transient voltage signal and a second threshold voltage. The on time regulating circuit generates an on time signal to regulate an on time of the switch based on the mode signal.

Claims (58)

1 . A controller for a switching converter, comprising:

a transient sensing circuit configured to generate a transient voltage signal indicative of a transient profile of an output voltage of the switching converter;

an on time regulating circuit configured to generate an on time signal to regulate an on time of a switch of the switching converter based on a first comparison between a first feedback voltage signal indicative of the output voltage and a first threshold voltage, and a second comparison between the transient voltage signal and a second threshold voltage; and

a comparing circuit configured to generate a set signal based on a comparison between a reference voltage and a second feedback voltage signal indicative of the output voltage; and wherein

the controller is configured to control the turning on of the switch based on the set signal and configured to control the turning off of the switch based on the on time signal; wherein

in response to the first feedback voltage signal decreasing to the first threshold voltage, the controller is configured to enter a mode during which the switch is controlled to be turned on and turned off uninterruptedly based on the set signal and the on time signal, and the on time signal is adjusted; and wherein

in response to the transient voltage signal increasing to the second threshold voltage, the controller is configured to exit the mode and the on time signal resumes.

2 . The controller of claim 1 , wherein

the on time regulating circuit is configured to increase the on time of the switch in response to the first feedback voltage signal decreasing to the first threshold voltage; and

the on time regulating circuit is configured to decrease the on time of the switch in response to the transient voltage signal increasing to the second threshold voltage.

3 . The controller of claim 1 , wherein the transient sensing circuit is configured to filter out the direct current component of the output voltage.

4 . The controller of claim 1 , wherein the transient sensing circuit comprises:

a first capacitor having a first terminal and a second terminal, wherein the first terminal is configured to receive the first feedback voltage signal; and

a first resistor having a first terminal and a second terminal, wherein the first terminal is coupled to the second terminal of the first capacitor and is configured to provide the transient voltage signal, and the second terminal is coupled to a reference ground.

5 . The controller of claim 1 , wherein the transient sensing circuit comprises:

a second resistor having a first terminal and a second terminal, wherein the first terminal is configured to receive the first feedback voltage signal;

a second capacitor having a first terminal and a second terminal, wherein the first terminal is coupled to the second terminal of the second resistor, and the second terminal is coupled to a reference ground; and

an amplifier coupled across the second resistor and configured to generate the transient voltage signal based on a voltage across the second resistor.

6 . The controller of claim 1 , further comprising a mode determining circuit, wherein the mode determining circuit comprises:

a first comparing circuit having a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is configured to receive the first threshold voltage, and the second input terminal is configured to receive the first feedback voltage signal, the first comparing circuit is configured to generate a first comparing signal at the output terminal;

a second comparing circuit having a first input terminal, a second input terminal and an output terminal, wherein the first input terminal is configured to receive the second threshold voltage, and the second input terminal is configured to receive the transient voltage signal, the second comparing circuit is configured to generate a second comparing signal at the output terminal; and

a mode signal generator configured to receive the first comparing signal and the second comparing signal, and to generate a mode signal based on the first comparing signal and the second comparing signal.

7 . The controller of claim 6 , wherein the mode signal generator comprises:

an overshoot control unit having an input terminal and an output terminal, wherein the input terminal is configured to receive the second comparing signal, the overshoot control unit is configured to generate an overshoot control signal at the output terminal based on the second comparing signal; and

a first logic unit configured to receive the first comparing signal and the overshoot control signal, and to generate the mode signal based on the first comparing signal and the overshoot control signal.

8 . The controller of claim 7 , wherein the overshoot control unit comprises:

a pulse generator having an input terminal and an output terminal, wherein the input terminal is configured to receive the second comparing signal, the pulse generator is configured to generate a pulse signal at the output terminal in response to the second comparing signal changing from a second state to a first state; and

a NOT gate having an input terminal and an output terminal, wherein the input terminal is configured to receive the pulse signal, the NOT gate is configured to invert the pulse signal to generate the overshoot control signal at the output terminal.

9 . The controller of claim 1 ,

wherein the on time regulating circuit is further configured to regulate the on time of the switch based on an input voltage of the switching converter.

10 . The controller of claim 1 , wherein the switch control circuit comprises:

a second logic unit configured to receive the set signal and the on time signal, and to generate a switch control signal based on the set signal and the on time signal;

wherein in response to the second feedback voltage signal being lower than the reference voltage, the second logic unit is configured to change the switch control signal from a first logic state into a second logic state to turn on the switch.

11 . A switching converter comprising: a switch, wherein the switching converter is configured to convert an input voltage into an output voltage through the on and off switching of the switch and wherein the output voltage has a transient profile; a transient sensing circuit configured to generate a transient voltage signal indicative of the transient profile of the output voltage; an on time regulating circuit configured to generate an on time signal to regulate an on time of the switch based on a first comparison between a first feedback voltage signal indicative of the output voltage and a first threshold voltage, and a second comparison between the transient voltage signal and a second threshold voltage; and a comparing circuit configured to generate a set signal based on a comparison between a reference voltage and a second feedback voltage signal indicative of the output voltage; and wherein the turning on of the switch is controlled based on the set signal and the turning off of the switch is controlled based on the on time signal; wherein in response to the first feedback voltage signal decreasing to the first threshold voltage, a controller is configured to enter a mode during which the switch is controlled to be turned on and turned off uninterruptedly based on the set signal and the on time signal, and the on time signal is adjusted; and wherein in response to the transient voltage signal increasing to the second threshold voltage, the controller is configured to exit the mode and the on time signal resumes.

12 . The switching converter of claim 11 , wherein

the on time regulating circuit is configured to increase the on time of the switch in response to the first feedback voltage signal decreasing to the first threshold voltage; and

the on time regulating circuit is configured to decrease the on time of the switch in response to the transient voltage signal increasing to the second threshold voltage.

13 . The switching converter of claim 11 , wherein the transient sensing circuit is configured to filter out the direct current component of the output voltage.

14 . The switching converter of claim 11 , wherein the transient sensing circuit comprises:

a first capacitor having a first terminal and a second terminal, wherein the first terminal is configured to receive the first feedback voltage signal; and

a first resistor having a first terminal and a second terminal, wherein the first terminal is coupled to the second terminal of the first capacitor and is configured to provide the transient voltage signal, and the second terminal is coupled to a reference ground.

15 . The switching converter of claim 11 , wherein the transient sensing circuit comprises:

a second resistor having a first terminal and a second terminal, wherein the first terminal is configured to receive the first feedback voltage signal;

a second capacitor having a first terminal and a second terminal, wherein the first terminal is coupled to the second terminal of the second resistor, and the second terminal is coupled to a reference ground; and

an amplifier coupled across the second resistor and configured to generate the transient voltage signal based on a voltage across the second resistor.

16 . A control method for a switching converter, comprising:

generating a first comparing signal based on a first comparison between a first feedback voltage signal indicative of an output voltage of the switching converter and a first threshold voltage;

generating a second comparing signal based on a second comparison between a transient voltage signal indicative of a transient profile of the output voltage and a second threshold voltage;

generating an on time signal to regulate an on time of a switch of the switching converter based on the first comparing signal and the second comparing signal;

generating a set signal based on a comparison between a second feedback voltage signal indicative of the output voltage and a reference voltage;

controlling the turning on of the switch based on the set signal; and

controlling the turning off of the switch based on the on time signal; wherein

in response to the first feedback voltage signal decreasing to the first threshold voltage, controlling the switching converter to enter a mode during which the switch is controlled to be turned on and turned off uninterruptedly based on the set signal and the on time signal, and the on time signal is adjusted; and wherein

in response to the transient voltage signal increasing to the second threshold voltage, controlling the switching converter to exit the mode and the on time signal resumes.

17 . The control method of claim 16 , wherein the first feedback voltage signal is identical to the second feedback voltage signal.

18 . The control method of claim 16 , wherein

increasing the on time of the switch in response to the first feedback signal decreasing to the first threshold voltage; and

decreasing the on time of the switch in response to the transient voltage signal increasing to the second threshold voltage.