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公开(公告)号：US10097092B1
公开(公告)日：2018-10-09
申请号：US15911125
申请日：2018-03-04
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Jyun-Che Ho , Yu-Chang Chen , Jo-Yu Wang , Yi-Wei Lee , Isaac Y. Chen
IPC: H02M3/158
Abstract: A multi-phase switching regulator includes: a plurality of power stages, a plurality of pulse width modulation (PWM) controllers and a ramp signal setting circuit. The PWM controllers generate corresponding PWM signals for controlling corresponding power stages respectively according to an error signal related to an output voltage and a plurality of ramp signals corresponding to corresponding power stages respectively. The ramp signal setting circuit adjusts the ramp signal of the phase that is to be enabled or disabled according to the phase adjustment signal. Under a phase-cut operation, the ramp signal setting circuit causes a basis level of the ramp signal corresponding to the phase to be disabled to gradually change, thereby decreasing a duty ratio of the PWM signal corresponding to the phase to be disabled.
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公开(公告)号：US10014783B2
公开(公告)日：2018-07-03
申请号：US15395641
申请日：2016-12-30
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Yi-Wei Lee , Chien-Yang Chen , Isaac Y. Chen , Ta-Yung Yang
CPC classification number: H02M3/33507 , H02M1/088 , H02M1/4208 , H02M1/4225 , H02M1/4258 , H02M2001/0009 , H02M2001/4291 , H02M2003/1566 , Y02B70/126 , Y02P80/112
Abstract: The present invention provides a switching regulator with PFC function and a control circuit and a control method thereof. The switching regulator with PFC function includes a power stage circuit, a current sense circuit, and a control circuit. The power stage circuit operates at least one power switch therein according to an operation signal to convert an input voltage to an output voltage. When a transient voltage of the input voltage exceeds a transient voltage upper limit, or when a transient slew rate of the input voltage exceeds a transient slew rate upper limit, the control circuit adjusts a frequency response gain from a stable state frequency response gain to a transient state frequency response gain, such that a transient current of an output current does not exceed a current upper limit, and/or that a transient response time of the output current does not exceed a threshold transient time period.
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公开(公告)号：US09654011B2
公开(公告)日：2017-05-16
申请号：US14695761
申请日：2015-04-24
Applicant: Richtek Technology Corporation
Inventor： Isaac Y. Chen
CPC classification number: H02M3/33507 , H02H3/027 , H02H7/1213 , H02M3/33523 , H02M2001/0032 , H02M2001/325 , Y02B70/16
Abstract: A feedback signal stabilized by a capacitor and related to an output voltage of a power converter is used to acquire the output power information of the power converter, and a control circuit uses a second clock not related to the switching frequency of the power converter to count a duration time of the feedback signal being higher than a threshold. When the duration time is higher than a preset time, an abnormal output power of the power converter is distinguished and the power converter will be turned off. The feedback signal will not vary severely even if the output terminal of the power converter is interfered, and the counted duration time will not be influenced when the switching frequency is changing caused by a load changing.
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公开(公告)号：US20160327968A1
公开(公告)日：2016-11-10
申请号：US15201473
申请日：2016-07-03
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chien-Fu Tang , Jiun-Hung Pan , Isaac Y. Chen
CPC classification number: G05F1/10 , H02M3/157 , H02M2001/0025 , H03M1/38
Abstract: A mixed mode compensation circuit for a power converter generate a digital signal according to a reference signal and a feedback signal which is related to the output voltage of the power converter, convert the digital signal into a first analog signal, offset the first analog signal with a variable offset value to generate a second analog signal, and filter out high-frequency components of the second analog signal to generate a third analog signal for stable output voltage of the power converter. The mixed mode compensation does not require large capacitors, and thus the circuit can be integrated into an integrated circuit.
Abstract translation: 用于功率转换器的混合模式补偿电路根据参考信号和与功率转换器的输出电压相关的反馈信号产生数字信号，将数字信号转换为第一模拟信号，将第一模拟信号与 可变偏移值，用于产生第二模拟信号，并且滤除第二模拟信号的高频分量以产生用于稳定的功率转换器的输出电压的第三模拟信号。 混合模式补偿不需要大电容器，因此电路可以集成到集成电路中。
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公开(公告)号：US20210227659A1
公开(公告)日：2021-07-22
申请号：US17060055
申请日：2020-09-30
Applicant: Richtek Technology Corporation
Inventor： Yu-Wen Chang , Leng-Nien Hsiu , Isaac Y. Chen
IPC: H05B45/325 , H05B45/10 , H03K3/356
Abstract: A dimmer interface circuit includes a buffer stage circuit and a PWM control circuit. The buffer stage circuit converts a dimming input signal to a dimming buffer signal. The buffer stage circuit includes: a power rail generation circuit, which generates a power rail according to the dimming input signal adaptively, so that the dimming input signal is between a high level voltage and a low level voltage of the power rail; and an amplification circuit, which receives the dimming input signal, to generate the dimming buffer signal. The power rail supplies electrical power to the amplification circuit, wherein the amplification circuit operates within a range between the high level voltage and the low level voltage. The PWM control circuit converts the dimming buffer signal to a PWM dimming signal, so as to adjust a brightness of an LED module.
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Patent Agency Ranking
公开(公告)号：US10355612B2
公开(公告)日：2019-07-16
申请号：US15865212
申请日：2018-01-08
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chien-Fu Tang , Su-Yuan Lin , Yi-Wei Lee , Isaac Y. Chen
Abstract: A flyback power converter circuit converting an input voltage to an output voltage includes a transformer, a power switch, a synchronous rectifier (SR) switch, and a secondary side control circuit. The secondary side control circuit controls the SR switch to be ON when the power switch is OFF. The secondary side control circuit includes a driving switch for controlling the SR switch, a synchronous control circuit powered by a voltage related to the output voltage, which controls the driving switch to operate the SR switch, and a clamping circuit including a clamping switch and a clamping switch control circuit. The clamping switch control circuit controls the clamping switch according to a current inflow terminal voltage of the clamping switch and/or the voltage related to the output voltage, such that, during a secondary side power-on period, an equivalent impedance of the current inflow terminal of the clamping switch is smaller than a predetermined clamping impedance.
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公开(公告)号：US20190115844A1
公开(公告)日：2019-04-18
申请号：US16132367
申请日：2018-09-15
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chien-Fu Tang , Jo-Yu Wang , Isaac Y. Chen
CPC classification number: H02M3/33592 , H02M1/08 , H02M3/33523 , H02M2001/0006
Abstract: A flyback power converter includes: a transformer, a power switch, a switch control unit, a synchronous rectifier switch and a secondary side control circuit. The secondary side control circuit includes: a switch signal generation circuit and a first power conversion circuit. The secondary side control circuit is coupled to the synchronous rectifier switch and the secondary winding of the transformer. The switch signal generation circuit generates the synchronous rectifier switch signal selectively according to a first power or a second power, to control the synchronous rectifier switch. The first power is related to the output voltage. The first power conversion circuit generates the second power according to a secondary phase signal on a phase node between the secondary winding of the transformer and the synchronous rectifier switch.
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28.发明申请公开(公告)号：US20190058390A1
公开(公告)日：2019-02-21
申请号：US16167434
申请日：2018-10-22
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Yi-Min Shiu , Isaac Y. Chen
CPC classification number: H02M1/32 , H02H7/10 , H02M3/156 , H02M3/33523 , H02M7/217 , H02M2001/0012 , H02M2001/0025
Abstract: The present invention discloses a short circuit and/or bad connection detection method for use in a power supply system. The power supply system includes a power converter which converts an input voltage to an output voltage and supplies an output current to an electronic device. In the short circuit detection method, the conversion from the input voltage to the output voltage is disabled in a disable time period, and whether a short circuit occurs is determined according to the decreasing speed of the output voltage. In the bad connection detection method, an actual voltage and an actual current received by the electronic device are compared with the output voltage and the output current, to determine whether a bad connection occurs.
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公开(公告)号：US09979214B2
公开(公告)日：2018-05-22
申请号：US15013459
申请日：2016-02-02
Applicant: Richtek Technology Corporation
Inventor： Ta-Yung Yang , Jing-Meng Liu , Isaac Y. Chen , Tzu-Chen Lin
CPC classification number: H02J7/0044 , G06F1/266 , H02J7/0042 , H02J7/0052 , H02J7/0055 , H02J7/007 , H02J7/0072 , H02J2007/0059 , H02J2007/0062
Abstract: An adaptive buck converter of a charging cable includes: a power receiving interface for receiving a DC voltage and a cable current from a cable; a terminal communication interface for transmitting a charging voltage and a charging current to a connection terminal of the charging cable and for receiving a communication signal generated by the mobile device from the connection terminal; a power converting circuit for receiving the DC voltage and the cable current from the power receiving interface and for generating the charging voltage and the charging current, wherein the charging voltage is lower than the DC voltage while the charging current is greater than the cable current; and a data processing circuit coupled with the power converting circuit and configured for controlling the power converting circuit according to the communication signal.
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公开(公告)号：US20180138797A1
公开(公告)日：2018-05-17
申请号：US15485226
申请日：2017-04-11
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Pei-Sheng Tsu , Chien-Fu Tang , Isaac Y. Chen
CPC classification number: H02M1/08 , H02H9/001 , H02H9/02 , H02M1/32 , H02M3/33523 , H02M3/33592 , H02M2001/0029 , Y02B70/1475
Abstract: The present invention provides a power switch control circuit and an open detection method thereof. The power switch control circuit is for generating an operation signal at an operation signal output pin according to an input signal, wherein the operation signal is for operating a power switch. The power switch control circuit includes: a current injection circuit, which is connected to the operation signal output pin, and provides a predetermined current to the operation signal output pin according to an enable signal; and an open detection circuit, which is coupled to the current injection circuit, and determines whether a connection between the operation signal output pin and the power switch is open according to a level of the operation signal output pin at a detection time point or according to a level variation of the operation signal output pin during a detection time period, whereby an open detection signal is generated.
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