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公开(公告)号：US20210226530A1
公开(公告)日：2021-07-22
申请号：US17022167
申请日：2020-09-16
Applicant: Richtek Technology Corporation
Inventor： Shui-Mu Lin , Tsung-Wei Huang , Huan-Chien Yang , Yung-Chun Chuang
IPC: H02M3/07
Abstract: A switching power conversion circuit includes a conversion capacitor, a capacitive power conversion circuit, an inductor, an inductive power conversion circuit and a switching control circuit. The capacitive power conversion circuit includes plural switching devices for generating an intermediate voltage which is in a predetermined proportional relationship to the input voltage. The inductive power conversion circuit includes plural switching devices for converting the intermediate voltage to an output voltage. The plural switching devices of the capacitive power conversion circuit and the inductive power conversion circuit switch the conversion capacitor and the inductor periodically according to the duty ratio of the switching control signal generated by the switching control circuit. The capacitive power conversion circuit and the inductive power conversion circuit share one of the plural switching devices.
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公开(公告)号：US11909315B2
公开(公告)日：2024-02-20
申请号：US17567129
申请日：2022-01-02
Applicant: Richtek Technology Corporation
Inventor： Yung-Chun Chuang , Huan-Chien Yang
CPC classification number: H02M3/158 , H02M1/0025 , H02M3/156 , H02M3/1566
Abstract: A switching regulator includes a power stage circuit and a controller circuit. The controller circuit includes a first amplification circuit, a second amplification circuit, a ramp signal generation circuit, and a comparator. The first amplification circuit generates an amplification signal according to a difference between a low-pass filtered signal and a feedback signal. The second amplification circuit generates an adjustment signal according to a difference between the feedback signal and a fast response signal. The comparator generates a pulse width modulation signal according to a difference between the amplification signal and a ramp signal to generate a switch control signal. The adjustment signal adaptively adjusts the amplification signal or the ramp signal. The low-pass filtered signal is related to a signal generated by filtering out higher frequency part of the reference signal, and the reference signal is related to a dynamic change of a target level of the output voltage.
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公开(公告)号：US11381176B2
公开(公告)日：2022-07-05
申请号：US17227276
申请日：2021-04-10
Applicant: Richtek Technology Corporation
Inventor： Yung-Chun Chuang , Huan-Chien Yang
IPC: H02M7/5387 , H02M1/00
Abstract: A switching power conversion circuit includes a conversion capacitor, a capacitive power conversion circuit, an inductor, an inductive power conversion circuit and a switching control circuit. The capacitive power conversion circuit switches the conversion capacitor periodically according to a switching control signal generated by the switching control circuit, to generate a first intermediate voltage and a first proportional voltage in a promptly rising mode and to generate a second intermediate voltage and a second proportional voltage in a promptly falling mode. In the promptly rising mode, a rising slope of an inductor current is determined by a difference between a high level of the first proportional voltage and an output voltage. In the promptly falling mode, a falling slope of the inductor current is determined by a difference between a low level of the second proportional voltage and the output voltage.
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公开(公告)号：US11984807B2
公开(公告)日：2024-05-14
申请号：US17734396
申请日：2022-05-02
Applicant: Richtek Technology Corporation
Inventor： Jian-Ming Fu , Huan-Chien Yang
CPC classification number: H02M3/158 , H02M1/0009
Abstract: A power converter includes an upper-gate circuit, a lower-gate circuit, an inductor, a first current sensor, a second current sensor, a weight adjustment circuit, and a PWM (Pulse Width Modulation) controller. The upper-gate circuit receives an input voltage. The lower-gate circuit is coupled to a ground node. The upper-gate circuit and the lower-gate circuit are operated according to the PWM voltage. The inductor is coupled to the upper-gate circuit and the lower-gate circuit. The first current sensor monitors the upper-gate circuit, so as to generate a first detection current. The second current sensor monitors the lower-gate circuit, so as to generate a second detection current. The weight adjustment circuit generates a control current according to the first detection current and the second detection current. The PWM controller generates the PWM voltage according to the control current.
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公开(公告)号：US20220231604A1
公开(公告)日：2022-07-21
申请号：US17567129
申请日：2022-01-02
Applicant: Richtek Technology Corporation
Inventor： Yung-Chun Chuang , Huan-Chien Yang
Abstract: A switching regulator includes a power stage circuit and a controller circuit. The controller circuit includes a first amplification circuit, a second amplification circuit, a ramp signal generation circuit, and a comparator. The first amplification circuit generates an amplification signal according to a difference between a low-pass filtered signal and a feedback signal. The second amplification circuit generates an adjustment signal according to a difference between the feedback signal and a fast response signal. The comparator generates a pulse width modulation signal according to a difference between the amplification signal and a ramp signal to generate a switch control signal. The adjustment signal adaptively adjusts the amplification signal or the ramp signal. The low-pass filtered signal is related to a signal generated by filtering out higher frequency part of the reference signal, and the reference signal is related to a dynamic change of a target level of the output voltage.
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Patent Agency Ranking
公开(公告)号：US11329553B2
公开(公告)日：2022-05-10
申请号：US17022167
申请日：2020-09-16
Applicant: Richtek Technology Corporation
Inventor： Shui-Mu Lin , Tsung-Wei Huang , Huan-Chien Yang , Yung-Chun Chuang
IPC: H02M3/07
Abstract: A switching power conversion circuit includes a conversion capacitor, a capacitive power conversion circuit, an inductor, an inductive power conversion circuit and a switching control circuit. The capacitive power conversion circuit includes plural switching devices for generating an intermediate voltage which is in a predetermined proportional relationship to the input voltage. The inductive power conversion circuit includes plural switching devices for converting the intermediate voltage to an output voltage. The plural switching devices of the capacitive power conversion circuit and the inductive power conversion circuit switch the conversion capacitor and the inductor periodically according to the duty ratio of the switching control signal generated by the switching control circuit. The capacitive power conversion circuit and the inductive power conversion circuit share one of the plural switching devices.
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公开(公告)号：US09049766B2
公开(公告)日：2015-06-02
申请号：US13921523
申请日：2013-06-19
Applicant: Richtek Technology Corporation
Inventor： Tsung-Wei Huang , Shui-Mu Lin , Huan-Chien Yang , Nang-Ching Yeung , Ti-Ti Liu
CPC classification number: H05B33/0839 , H05B33/0815 , H05B33/0827 , Y02B20/347
Abstract: A LED driver using a PWM signal for dimming control includes a power converter and a current regulator. The power converter provides an output voltage and a load current for a plurality of LEDs. The current regulator provides a load current dependent signal for the power converter to speed up load transient response caused by variation of the load current, to reduce the ripple of the output voltage, and thereby to avoid audio noise during PWM dimming.
Abstract translation: 使用PWM信号进行调光控制的LED驱动器包括功率转换器和电流调节器。 功率转换器为多个LED提供输出电压和负载电流。 电流调节器为功率转换器提供负载电流相关信号，以加速由负载电流变化引起的负载瞬态响应，以减少输出电压的纹波，从而避免PWM调光期间的音频噪声。
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公开(公告)号：US11658650B1
公开(公告)日：2023-05-23
申请号：US17722796
申请日：2022-04-18
Applicant: Richtek Technology Corporation
Inventor： Jian-Ming Fu , Huan-Chien Yang
Abstract: A PWM (Pulse Width Modulation) controller includes a current detector, a current emulator, a voltage-to-current converter, and a current adder. The current detector detects a first current, and generates a second current according to the first current. The current detector receives an input voltage and outputs an output voltage. The current emulator obtains the relative information of a lower-gate current. The voltage-to-current converter draws a third current from the current emulator according to the input voltage and the output voltage. The current emulator generates a fourth current according to the relative information and the third current. The current adder adds the fourth current to the second current, so as to generate a sum current.
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公开(公告)号：US20210351719A1
公开(公告)日：2021-11-11
申请号：US17227276
申请日：2021-04-10
Applicant: Richtek Technology Corporation
Inventor： Yung-Chun Chuang , Huan-Chien Yang
IPC: H02M7/5387 , H02M1/00
Abstract: A switching power conversion circuit includes a conversion capacitor, a capacitive power conversion circuit, an inductor, an inductive power conversion circuit and a switching control circuit. The capacitive power conversion circuit switches the conversion capacitor periodically according to a switching control signal generated by the switching control circuit, to generate a first intermediate voltage and a first proportional voltage in a promptly rising mode and to generate a second intermediate voltage and a second proportional voltage in a promptly falling mode. In the promptly rising mode, a rising slope of an inductor current is determined by a difference between a high level of the first proportional voltage and an output voltage. In the promptly falling mode, a falling slope of the inductor current is determined by a difference between a low level of the second proportional voltage and the output voltage.
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公开(公告)号：US20190246475A1
公开(公告)日：2019-08-08
申请号：US16198860
申请日：2018-11-22
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Huan-Chien Yang , Tsung-Wei Huang , Hui-Wen Cheng , Shui-Mu Lin
CPC classification number: H05B37/0209 , G11C27/02
Abstract: A light emitting device driver circuit includes: a power conversion circuit, an error amplifier circuit, a sample-and-hold circuit, a load current generation circuit and a feed-forward capacitor. When the light emitting device driver circuit is in a disable phase, the sample-and-hold circuit connects a feedback signal with a second reference voltage and the sample-and-hold circuit disconnects the feedback signal from a load node, whereby the feed-forward capacitor samples a sample voltage and holds it after the disable phase transits to an enable phase. In the enable phase, the sample-and-hold circuit disconnects the feedback signal from the second reference voltage and the sample-and-hold circuit connects the feedback signal with the load node, so that during a predetermined period following the transition, there is a sufficient difference between two input terminals of the error amplifier circuit so that the load current is raised to a desired current level within the predetermined period.
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