公开(公告)号：US20250105718A1

公开(公告)日：2025-03-27

申请号：US18412996

申请日：2024-01-15

Applicant: Richtek Technology Corporation

Inventor： Yi-Chun Chen ,  Kuo-Ping Liu

IPC: H02M1/00 ,  H02M3/157 ,  H02M3/158

Abstract: A power conversion system for converting an input power to an output power, includes: a current limit circuit clamping an input current of the output power to be not exceeding an input current limit during a current clamping state; and a charge quantity regulation circuit converting the output power to a temporary storage power in a temporary storage capacitor during a charging mode, wherein the charge quantity regulation circuit converts the temporary storage power to generate the output power in collaboration with the current limit circuit during a discharging mode. When the input current reaches a current threshold, the charge quantity regulation circuit enters the discharging mode. During the discharging mode, the charge quantity regulation circuit regulates an output voltage of the output power to a target level, wherein the target level is lower than an input voltage of the input power.

公开(公告)号：US10170987B2

公开(公告)日：2019-01-01

申请号：US15388923

申请日：2016-12-22

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Yu-Nung Tsai ,  Yi-Chun Chen

IPC: H02M3/158 ,  H02M3/157 ,  G05F1/46 ,  H02M1/00 ,  H02M1/44

Abstract: A control circuit includes: a comparing circuit, having a first input terminal and second input terminal, configured to operably generate a comparison signal according signals received by the first and second input terminals, wherein the first input terminal is utilized for coupling with a reference signal and the second input terminal is utilized for coupling with a feedback signal; a periodic signal generating circuit configured to operably generate a periodic signal and apply the periodic signal to the first input terminal or the second input terminal of the comparing circuit; and a control signal generating circuit for controlling an on time of a power switch according to the comparison signal. The periodic signal generating circuit clamps a limit of the periodic signal to a predetermined value, but does not configure the slope of the periodic signal to be zero when there is no current passing through the inductor.