公开(公告)号：US20210296989A1

公开(公告)日：2021-09-23

申请号：US17145402

申请日：2021-01-11

Applicant: Richtek Technology Corporation

Inventor： Yung-Jen Chen ,  Yu-Chieh Lin ,  Chia-Chi Liu ,  Fu-To Lin

IPC: H02M3/158 ,  H02M1/08 ,  G05F1/575 ,  G05F1/565

Abstract: A switching regulator which has load transient quick response ability includes at least one power stage circuit and a control circuit. The control circuit includes a pulse width modulation (PWM) signal generation circuit and a quick response (QR) signal generation circuit. The PWM signal generation circuit generates a PWM signal according to an output voltage and a QR signal, to control a power switch of the corresponding power stage circuit, thus converting an input voltage to the output voltage. The QR signal generation circuit includes a differentiator circuit and a comparison circuit. The differentiator circuit performs a differential operation on a voltage sensing signal related to the output voltage, to generate a differential signal. The comparison circuit compares the differential signal with a QR threshold signal, such that when the differential signal exceeds the QR signal, the PWM signal generation circuit performs a QR procedure.

公开(公告)号：US11381173B2

公开(公告)日：2022-07-05

申请号：US17145402

申请日：2021-01-11

Applicant: Richtek Technology Corporation

Inventor： Yung-Jen Chen ,  Yu-Chieh Lin ,  Chia-Chi Liu ,  Fu-To Lin

IPC: H02M3/158 ,  H02M1/08 ,  G05F1/575 ,  G05F1/565 ,  H02M1/00 ,  H02M3/156

Abstract: A switching regulator which has load transient quick response ability includes at least one power stage circuit and a control circuit. The control circuit includes a pulse width modulation (PWM) signal generation circuit and a quick response (QR) signal generation circuit. The PWM signal generation circuit generates a PWM signal according to an output voltage and a QR signal, to control a power switch of the corresponding power stage circuit, thus converting an input voltage to the output voltage. The QR signal generation circuit includes a differentiator circuit and a comparison circuit. The differentiator circuit performs a differential operation on a voltage sensing signal related to the output voltage, to generate a differential signal. The comparison circuit compares the differential signal with a QR threshold signal, such that when the differential signal exceeds the QR signal, the PWM signal generation circuit performs a QR procedure.

公开(公告)号：US20240223069A1

公开(公告)日：2024-07-04

申请号：US18325022

申请日：2023-05-29

Applicant: Richtek Technology Corporation

Inventor： Fu-To Lin ,  Chang-Jung Fu

IPC: H02M1/088 ,  H02M1/00 ,  H02M1/32 ,  H02M3/157

CPC classification number: H02M1/088 ,  H02M1/0009 ,  H02M1/32 ,  H02M3/157

Abstract: A switching power converter for converting an input power to an output power includes a power stage; and a conversion control circuit which includes: a current limit control circuit for comparing a current monitor signal and a sensing signal limit threshold to generate a current limit control signal, wherein the current monitor signal is related to an output current of the output power; and a PWM control circuit for generating a PWM signal according to an output voltage of the output power for controlling the power stage to generate the output power. The first state of the PWM signal has a first constant time. When the current limit control signal indicates that the output current exceeds a current limit threshold, the PWM control circuit controls a switching frequency of the PWM signal to operate at a fixed frequency. The fixed frequency is lower than a predetermined frequency limit.