公开(公告)号：US20160219662A1

公开(公告)日：2016-07-28

申请号：US15008289

申请日：2016-01-27

Applicant: Richtek Technology Corporation

Inventor： Jyun-Che HO ,  Isaac Y. CHEN ,  Yi-Wei LEE

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0848

Abstract: A control circuit of a LED driver utilizes a counter to acquire a cycle and a conduction time or a non-conduction time of an AC phase-cut voltage outputted by a TRIAC dimmer. A bleeding signal is determined according to the cycle and the conduction time or the non-conduction time and used for adjusting a bleeding current so as to avoid a flickering of the LED. The control circuit does not need extra pins for coupling a large capacitor, but the bleeding signal can be still acquired. Preferably, the present invention is suitable for an IC of low pin numbers.

Abstract translation: LED驱动器的控制电路利用计数器来获取由TRIAC调光器输出的AC相切电压的周期和导通时间或非导通时间。 根据循环和导通时间或非导通时间确定出血信号，并用于调节出血电流，以避免LED的闪烁。 控制电路不需要用于耦合大电容器的额外引脚，但仍可获取出血信号。 优选地，本发明适用于低引脚数的IC。

公开(公告)号：US20160353534A1

公开(公告)日：2016-12-01

申请号：US15155857

申请日：2016-05-16

Applicant: Richtek Technology Corporation

Inventor： Jiun-Hung PAN ,  Tong-Cheng JAO ,  Yi-Wei LEE ,  Isaac Y. CHEN

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0827 ,  H05B33/083 ,  H05B33/0842 ,  H05B33/0845

Abstract: A driver circuit of a LED luminance device includes: a signal pin; a determining circuit for determining the magnitude of an input signal; an indication signal generating circuit for outputting an indication signal to the signal pin according to the determining result of the determining circuit; an alignment signal generating circuit for generating an alignment signal when triggered by a predetermined edge of a signal at the signal pin; an indication signal detecting circuit for detecting the signal at the signal pin to generate a detection signal; and a control signal generating circuit for generating multiple control signals according to the detection signal to respectively control multiple switching elements in parallel connection with multiple LED devices when triggered by the alignment signal.

Abstract translation: LED亮度装置的驱动电路包括：信号引脚; 用于确定输入信号的大小的确定电路; 指示信号发生电路，用于根据确定电路的确定结果向信号引脚输出指示信号; 对准信号发生电路，用于当由信号引脚上的信号的预定边沿触发时产生对准信号; 指示信号检测电路，用于检测信号引脚处的信号以产生检测信号; 以及控制信号发生电路，用于根据检测信号产生多个控制信号，以在由对准信号触发时分别控制与多个LED器件并联连接的多个开关元件。

公开(公告)号：US20160242245A1

公开(公告)日：2016-08-18

申请号：US15018309

申请日：2016-02-08

Applicant: Richtek Technology Corporation

Inventor： Tong-Cheng JAO ,  Yi-Wei LEE ,  Jiun-Hung PAN ,  Isaac Y. CHEN

IPC: H05B33/08

CPC classification number: H05B33/0845 ,  H05B33/083

Abstract: A linear LED driver includes a voltage supply terminal providing a driving voltage, at least one first transistor, each of which has an input terminal coupled to a respective LED, and a bleeder circuit. When the voltage of the output terminal of each of the at least one first transistor is lower than a first threshold and a power voltage is higher than a second threshold, the bleeder circuit will generate a bleeder current to discharge the voltage supply terminal so as to prevent the LEDs from flickering. The bleeder circuit detects the voltage of the output terminal of each of the at least one first transistor. Therefore, whether the LEDs are lighted up can be confirmed so that the bleeder current can be provided at properly time point.

Abstract translation: 线性LED驱动器包括提供驱动电压的电压供应端子，至少一个第一晶体管，每个第一晶体管具有耦合到相应LED的输入端子和泄放电路。 当所述至少一个第一晶体管中的每一个的输出端子的电压低于第一阈值并且电源电压高于第二阈值时，所述泄放电路将产生泄放电流以对所述电压供应端子进行放电，以便 防止LED闪烁。 泄放电路检测至少一个第一晶体管中的每一个的输出端子的电压。 因此，可以确认LED是否点亮，从而可以在正确的时间点设置泄放电流。

公开(公告)号：US20140355320A1

公开(公告)日：2014-12-04

申请号：US14294789

申请日：2014-06-03

Applicant: Richtek Technology Corporation

Inventor： Yi-Wei LEE ,  Chih-Feng HUANG ,  Kuo-Chin CHIU

IPC: H02M7/217

CPC classification number: H02M7/217 ,  H01L29/0692 ,  H01L29/808 ,  H02M7/003 ,  H02M7/537

Abstract: A control circuit for an AC-DC power converter includes a junction field effect transistor (JFET), a first resistor, a second resistor, and a third resistor. The JFET includes a substrate, a drain, a source, a gate, a first oxide layer, and a second oxide layer. The first oxide layer is attached to a region located between the drain and the gate of the JFET, and the second oxide layer is not attached to a region located between the drain and the gate of the JFET. The first resistor is positioned on the first oxide layer, and the second resistor and the third resistor are positioned on the second oxide layer. When the JFET and the first resistor receive an input power signal, the first, the second, and the third resistors divide the input power signal, and prevent from the breakdown of the first oxide layer and the second oxide layer.

Abstract translation: 用于AC-DC电力转换器的控制电路包括结场效应晶体管（JFET），第一电阻器，第二电阻器和第三电阻器。 JFET包括衬底，漏极，源极，栅极，第一氧化物层和第二氧化物层。 第一氧化物层附接到位于JFET的漏极和栅极之间的区域，并且第二氧化物层未附接到位于JFET的漏极和栅极之间的区域。 第一电阻器位于第一氧化物层上，第二电阻器和第三电阻器位于第二氧化物层上。 当JFET和第一电阻器接收输入功率信号时，第一，第二和第三电阻器分割输入功率信号，并防止第一氧化物层和第二氧化物层的击穿。