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

IPC: H05B33/08 ,  H02M7/04

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。

公开(公告)号：US20160141966A1

公开(公告)日：2016-05-19

申请号：US14943662

申请日：2015-11-17

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Chun-Shih Huang ,  Chang-Yu Wu ,  Pei-Yuan Chen

IPC: H02M3/335

CPC classification number: H02M3/33523 ,  H02M1/4258 ,  H02M2001/0009 ,  H02M2001/0025 ,  H02M2001/0032 ,  Y02B70/126 ,  Y02B70/16

Abstract: The present invention provides a flyback power converter, a secondary side control circuit, and a control method thereof. The flyback power converter converts an input voltage to an output voltage, and provides a load current to a load circuit. The flyback power converter includes: a transformer circuit, a power switch circuit, a switch current sense circuit, a primary side control circuit, and a secondary side control circuit. The secondary side control circuit adaptively adjusts a frequency of a zero of a compensator gain function and/or a mid-frequency gain of the compensator gain function according to the load current, such that a number of poles of a system open loop gain function of the flyback power converter is at most more than a number of zeroes of the system open loop gain function by one under a crossover frequency.

Abstract translation: 本发明提供一种反激式功率转换器，次级侧控制电路及其控制方法。 反激式功率转换器将输入电压转换为输出电压，并向负载电路提供负载电流。 反激式功率转换器包括：变压器电路，电源开关电路，开关电流检测电路，初级侧控制电路和次级侧控制电路。 次级侧控制电路根据负载电流自适应地调整补偿器增益功能的零频率和/或补偿器增益功能的中频增益，使得系统开环增益功能的极数为 反激式功率转换器在系统开环增益功能下最多不超过一个零的交叉频率。

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

IPC: H05B37/02 ,  H05B33/08 ,  H02M7/04

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。

公开(公告)号：US09277610B2

公开(公告)日：2016-03-01

申请号：US14133229

申请日：2013-12-18

Applicant: Richtek Technology Corporation

Inventor： Leng-Nien Hsiu ,  Pei-Yuan Chen

IPC: H05B37/02 ,  H05B33/08 ,  H02M3/158 ,  H02M1/00

CPC classification number: H05B33/0815 ,  H02M3/1582 ,  H02M2001/007 ,  H05B33/0848

Abstract: A power converter circuit of a low power illumination device includes a boost converter circuit, a buck converter circuit, and a control circuit, for cooperating with a dimmer and an electric transformer. The control circuit configures the boost converter circuit to alternatively operate in a current conducting mode and an off mode, to draw current from the electric transformer in the current conducting mode, and to stop drawing current from the electric transformer in the off mode. The control circuit further configures the buck converter circuit to generate the required output signals to the low power illumination device according to the configuration of the dimmer so that the low power illumination device may perform the required dimming function.

Abstract translation: 低功率照明装置的功率转换器电路包括升压转换器电路，降压转换器电路和控制电路，用于与调光器和电变压器配合。 控制电路将升压转换器电路配置为以电流传导模式和关断模式交替工作，在电流传导模式下从电力变压器抽取电流，并且在关闭模式下停止从电力变压器抽取电流。 控制电路进一步配置降压转换器电路以根据调光器的配置向低功率照明装置产生所需的输出信号，使得低功率照明装置可以执行所需的调光功能。

公开(公告)号：US09265099B2

公开(公告)日：2016-02-16

申请号：US14133143

申请日：2013-12-18

Applicant: Richtek Technology Corporation

Inventor： Gang Zheng ,  Leng-Nien Hsiu ,  Pei-Yuan Chen

IPC: H05B37/02 ,  H05B33/08

CPC classification number: H05B33/0803 ,  H05B33/0815

Abstract: A power converter circuit for a low power illumination device includes a boost converter circuit, a buck converter circuit, and a control circuit. The control circuit configures the boost converter circuit to alternately operate in a current conducting mode and an off mode, to draw different values of the current from an electric transformer in different periods in the current conducting mode, and to stop drawing current from the electric transformer in the off mode. The control circuit further configures the buck converter circuit to generate the required output signals to the low power illumination device according to the output of the boost converter circuit so that the low power illumination device may function normally.

Abstract translation: 用于低功率照明装置的功率转换器电路包括升压转换器电路，降压转换器电路和控制电路。 控制电路将升压转换器电路配置为在电流传导模式和关断模式下交替工作，在电流传导模式中在不同周期中从电力变压器中抽取不同的电流值，并且停止从电力变压器 处于关闭模式。 控制电路还配置降压转换器电路，以根据升压转换器电路的输出向低功率照明装置产生所需的输出信号，使得低功率照明装置可正常工作。

公开(公告)号：US09564815B2

公开(公告)日：2017-02-07

申请号：US14943662

申请日：2015-11-17

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Chun-Shih Huang ,  Chang-Yu Wu ,  Pei-Yuan Chen

IPC: H02M3/335 ,  H02M1/00 ,  H02M1/42

CPC classification number: H02M3/33523 ,  H02M1/4258 ,  H02M2001/0009 ,  H02M2001/0025 ,  H02M2001/0032 ,  Y02B70/126 ,  Y02B70/16

Abstract: The present invention provides a flyback power converter, a secondary side control circuit, and a control method thereof. The flyback power converter converts an input voltage to an output voltage, and provides a load current to a load circuit. The flyback power converter includes: a transformer circuit, a power switch circuit, a switch current sense circuit, a primary side control circuit, and a secondary side control circuit. The secondary side control circuit adaptively adjusts a frequency of a zero of a compensator gain function and/or a mid-frequency gain of the compensator gain function according to the load current, such that a number of poles of a system open loop gain function of the flyback power converter is at most more than a number of zeroes of the system open loop gain function by one under a crossover frequency.

Abstract translation: 本发明提供一种反激式功率转换器，次级侧控制电路及其控制方法。 反激式功率转换器将输入电压转换为输出电压，并向负载电路提供负载电流。 反激式功率转换器包括：变压器电路，电源开关电路，开关电流检测电路，初级侧控制电路和次级侧控制电路。 次级侧控制电路根据负载电流自适应地调整补偿器增益功能的零频率和/或补偿器增益功能的中频增益，使得系统开环增益功能的极数为 反激式功率转换器在系统开环增益功能下最多不超过一个零的交叉频率。