US 12,249,914 B2
Quick response switching power converter and conversion control circuit thereof
Hsien-Cheng Hsieh, Hsinchu (TW); Chieh-Han Kuo, Hsinchu (TW); and Hsing-Shen Huang, Hsinchu (TW)
Assigned to Richtek Technology Corporation, Hsinchu (TW)
Filed by Richtek Technology Corporation, Hsinchu (TW)
Filed on Jan. 4, 2023, as Appl. No. 18/149,677.
Claims priority of provisional application 63/303,040, filed on Jan. 26, 2022.
Claims priority of application No. 111125978 (TW), filed on Jul. 11, 2022.
Prior Publication US 2023/0238883 A1, Jul. 27, 2023
Int. Cl. H02M 3/158 (2006.01); H02M 1/00 (2006.01)
CPC H02M 3/158 (2013.01) [H02M 1/0025 (2021.05)] 20 Claims
OG exemplary drawing
 
1. A conversion control circuit, which is for use in a quick response switching power converter and is configured to control a power stage circuit according to a first feedback signal and a second feedback signal, the conversion control circuit comprising:
an error amplifier circuit, which is configured to amplify a difference between the first feedback signal and a reference signal, so as to generate an error amplified signal;
a ramp signal generation circuit, which is configured to generate a ramp signal;
a pulse width modulation circuit, which is configured to compare the error amplified signal and the ramp signal to generate a pulse width modulation (PWM) signal, wherein the PWM signal is configured to control the power stage circuit, thereby regulating an output voltage to a predetermined target level; and
a quick response control circuit, which is configured to perform a quick response control function, wherein the quick response control function includes:
comparing the second feedback signal with at least one reference threshold to determine whether the output voltage crosses an output threshold, and generating a quick response control signal accordingly; and
when the second feedback signal crosses the reference threshold, adjusting the slope of the ramp signal according to the quick response control signal, to accelerate an increase or decrease of a duty of the PWM signal, thereby accelerating a transient response of the quick response switching power converter;
wherein the first feedback signal and the second feedback signal are positively related to the output voltage.