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1.发明授权Light emitting device driver circuit and control circuit and control method thereof 有权发光装置驱动电路及其控制电路及其控制方法公开(公告)号：US09504102B1
公开(公告)日：2016-11-22
申请号：US15068572
申请日：2016-03-12
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Pei-Yuan Chen , Chien-Yang Chen , Leng-Nien Hsiu
CPC classification number: H02M7/04 , H05B33/0815 , H05B33/0845
Abstract: The present invention provides a light emitting device driver circuit and a control circuit and a control method thereof. The light emitting device driver circuit includes a power stage circuit, a feedback circuit, and a control circuit. The control circuit includes a comparison circuit, a hysteresis control circuit, and a bleeder circuit. The control circuit generates an analog control signal according to a rectified dimmer signal and an output signal, for controlling the power stage circuit to regulate an output current, which is supplied to a light emitting device circuit to determine its brightness. When the analog control signal decreases to a predetermined hysteresis low level, the light emitting device driver circuit operates in a cut-off mode wherein the bleeder circuit consumes a bleeder current so as to maintain the output current at a zero current, for keeping the light emitting device circuit OFF.
Abstract translation: 本发明提供一种发光装置驱动电路及其控制电路及其控制方法。 发光装置驱动电路包括功率级电路，反馈电路和控制电路。 控制电路包括比较电路，滞后控制电路和泄放电路。 控制电路根据整流调光器信号和输出信号产生模拟控制信号，用于控制功率级电路调节输出电流，该输出电流被提供给发光器件电路以确定其亮度。 当模拟控制信号降低到预定的滞后低电平时，发光器件驱动器电路工作在截止模式，其中泄放电路消耗泄放电流，以将输出电流保持在零电流，以保持光 发光装置电路关闭。
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Patent Agency Ranking
公开(公告)号：US09966833B2
公开(公告)日：2018-05-08
申请号：US15489479
申请日：2017-04-17
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chien-Yang Chen , Ta-Yung Yang , Yu-Wen Chang
CPC classification number: H02M1/15 , H02M1/32 , H02M3/156 , H02M7/06 , H02M2001/0045 , H05B33/0809 , H05B33/0815 , H05B33/089
Abstract: The present invention discloses a switching regulator capable of reducing current ripple and a control circuit thereof. The switching regulator includes a buck power stage circuit and a control circuit. The control circuit includes an operation signal generation circuit and a current source circuit for reducing current ripple. The current source circuit is coupled to the operation signal generation circuit and the buck power stage circuit, for operating a ripple reduction switch therein according to an operation signal, to convert the output voltage to a load voltage between a load node and a reference node, and to reduce a current ripple of the output current, so as to generate a load current which is supplied to a load circuit, wherein the load circuit is coupled between the load node and the reference node, and the current source circuit is coupled between the output node and the load node.
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公开(公告)号：US20170353102A1
公开(公告)日：2017-12-07
申请号：US15489479
申请日：2017-04-17
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Chien-Yang Chen , Ta-Yung Yang , Yu-Wen Chang
CPC classification number: H02M1/15 , H02M1/32 , H02M3/156 , H02M7/06 , H02M2001/0045 , H05B33/0809 , H05B33/0815 , H05B33/089
Abstract: The present invention discloses a switching regulator capable of reducing current ripple and a control circuit thereof. The switching regulator includes a buck power stage circuit and a control circuit. The control circuit includes an operation signal generation circuit and a current source circuit for reducing current ripple. The current source circuit is coupled to the operation signal generation circuit and the buck power stage circuit, for operating a ripple reduction switch therein according to an operation signal, to convert the output voltage to a load voltage between a load node and a reference node, and to reduce a current ripple of the output current, so as to generate a load current which is supplied to a load circuit, wherein the load circuit is coupled between the load node and the reference node, and the current source circuit is coupled between the output node and the load node.
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公开(公告)号：US20170331381A1
公开(公告)日：2017-11-16
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
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：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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6.发明申请LIGHT EMITTING DEVICE DRIVER CIRCUIT AND CONTROL CIRCUIT AND CONTROL METHOD THEREOF 有权发光装置驱动电路及其控制电路及其控制方法公开(公告)号：US20160323944A1
公开(公告)日：2016-11-03
申请号：US15068572
申请日：2016-03-12
Applicant: RICHTEK TECHNOLOGY CORPORATION
Inventor： Pei-Yuan Chen , Chien-Yang Chen , Leng-Nien Hsiu
CPC classification number: H02M7/04 , H05B33/0815 , H05B33/0845
Abstract: The present invention provides a light emitting device driver circuit and a control circuit and a control method thereof. The light emitting device driver circuit includes a power stage circuit, a feedback circuit, and a control circuit. The control circuit includes a comparison circuit, a hysteresis control circuit, and a bleeder circuit. The control circuit generates an analog control signal according to a rectified dimmer signal and an output signal, for controlling the power stage circuit to regulate an output current, which is supplied to a light emitting device circuit to determine its brightness. When the analog control signal decreases to a predetermined hysteresis low level, the light emitting device driver circuit operates in a cut-off mode wherein the bleeder circuit consumes a bleeder current so as to maintain the output current at a zero current, for keeping the light emitting device circuit OFF.
Abstract translation: 本发明提供一种发光装置驱动电路及其控制电路及其控制方法。 发光装置驱动电路包括功率级电路，反馈电路和控制电路。 控制电路包括比较电路，滞后控制电路和泄放电路。 控制电路根据整流调光器信号和输出信号产生模拟控制信号，用于控制功率级电路调节输出电流，该输出电流被提供给发光器件电路以确定其亮度。 当模拟控制信号降低到预定的滞后低电平时，发光器件驱动器电路工作在截止模式，其中泄放电路消耗泄放电流，以将输出电流保持在零电流，以保持光 发光装置电路关闭。
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