公开(公告)号：US11811321B2

公开(公告)日：2023-11-07

申请号：US17736374

申请日：2022-05-04

Applicant: Richtek Technology Corporation

Inventor： Chen-Lin Hsu ,  Chia-Chun Lee

IPC: H02M3/158 ,  H03K3/017 ,  H02M1/00 ,  H02M3/335

CPC classification number: H02M3/158 ,  H02M1/0041 ,  H03K3/017 ,  H02M3/33523

Abstract: A spread spectrum switching power converter circuit includes: a power stage circuit which includes an inductor and a power switch and is configured to switch the power switch according to a switching signal having spread spectrum for power conversion; a variable frequency oscillator, which generates a spread spectrum clock signal according to a spread spectrum control signal; a spread spectrum control circuit, which generates the spread spectrum control signal according to a first clock signal and a second clock signal; and a pulse width modulation circuit, configured to generate the switching signal according to a feedback signal based on the spread spectrum clock signal. The spread spectrum control circuit generates the spread spectrum control signal by sampling and combining a periodic waveform and a random waveform. The random waveform is generated according to the first clock signal and the periodic waveform is generated according to the second clock signal.

公开(公告)号：US20220360173A1

公开(公告)日：2022-11-10

申请号：US17736374

申请日：2022-05-04

Applicant: Richtek Technology Corporation

Inventor： Chen-Lin Hsu ,  Chia-Chun Lee

IPC: H02M3/158 ,  H02M1/00 ,  H03K3/017

Abstract: A spread spectrum switching power converter circuit includes: a power stage circuit which includes an inductor and a power switch and is configured to switch the power switch according to a switching signal having spread spectrum for power conversion; a variable frequency oscillator, which generates a spread spectrum clock signal according to a spread spectrum control signal; a spread spectrum control circuit, which generates the spread spectrum control signal according to a first clock signal and a second clock signal; and a pulse width modulation circuit, configured to generate the switching signal according to a feedback signal based on the spread spectrum clock signal. The spread spectrum control circuit generates the spread spectrum control signal by sampling and combining a periodic waveform and a random waveform. The random waveform is generated according to the first clock signal and the periodic waveform is generated according to the second clock signal.