公开(公告)号：US20160105116A1

公开(公告)日：2016-04-14

申请号：US14879175

申请日：2015-10-09

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Kuang-Fu Chang ,  Tzu-Chen Lin ,  Chien-Fu Tang

IPC: H02M3/335

CPC classification number: H02M3/33523 ,  H02M2001/0032

Abstract: The present invention provides a flyback power converter with a programmable output and a control circuit and a control method thereof. The flyback power converter converts an input voltage to a programmable output voltage according to a setting signal, wherein the programmable output voltage switches between different levels. The flyback power converter includes: a transformer circuit, a power switch circuit, a current sense circuit, an opto-coupler circuit, and a control circuit. The control circuit adaptively adjusts an operation signal according to a level of the programmable output voltage, to maintain a same or relatively higher operation frequency of the operation signal when the programmable output voltage switches to a relatively lower level, so as to maintain a phase margin while supplying the same output current.

Abstract translation: 本发明提供具有可编程输出和控制电路的回扫功率转换器及其控制方法。 回扫功率转换器根据设置信号将输入电压转换为可编程输出电压，其中可编程输出电压在不同电平之间切换。 反激式功率转换器包括：变压器电路，功率开关电路，电流检测电路，光耦合器电路和控制电路。 控制电路根据可编程输出电压的电平自适应地调整操作信号，以在可编程输出电压切换到相对较低的电平时维持操作信号的相同或相对较高的操作频率，以便保持相位裕度 同时提供相同的输出电流。

公开(公告)号：US09173264B2

公开(公告)日：2015-10-27

申请号：US13926538

申请日：2013-06-25

Applicant: Richtek Technology Corporation

Inventor： Jiun-Hung Pan ,  Chien-Fu Tang ,  Isaac Y. Chen ,  Tsung-Hsi Yang

IPC: H05B33/08

CPC classification number: H05B33/0815 ,  H05B33/0827

Abstract: An LED control device for configuring a phase-cut dimming system includes an LED and a switch. The LED control device configures the conduction status of the switch so as to supply power to the LED according to an input signal. The LED control device further detects whether the input signal is phase-cut. When the input signal is phase-cut, the LED control device stores the signal values of the internal circuits. Afterward, when the input signal is not phase-cut, the LED control device restores the stored signal values so that the internal circuits may resume to the previous operation status rapidly.

Abstract translation: 用于配置相位调光系统的LED控制装置包括LED和开关。 LED控制装置配置开关的导通状态，以根据输入信号向LED供电。 LED控制装置还检测输入信号是否被切断。 当输入信号为相位切断时，LED控制装置存储内部电路的信号值。 之后，当输入信号不是相位切断时，LED控制装置恢复存储的信号值，使得内部电路可以快速恢复到先前的操作状态。

公开(公告)号：US08779806B2

公开(公告)日：2014-07-15

申请号：US13761825

申请日：2013-02-07

Applicant: Richtek Technology Corporation

Inventor： Pei-Kai Tseng ,  Chien-Fu Tang ,  Isaac Y. Chen

IPC: H03K3/00 ,  H03L5/00

CPC classification number: H03K3/013 ,  H03K19/00361 ,  H03K19/018507 ,  H03L5/00

Abstract: A floating gate driver uses a single-end level shifter to translate a set signal and a reset signal induced by a rising edge and a falling edge of a switch signal to a common output terminal to generate an output voltage for a bistable circuit to generate a level shifted switch signal. Under control of a well transient detect signal asserted by detecting noise in the output voltage, a masking circuit between the single-end level shifter and the bistable circuit masks noise in the output voltage. This configuration has lower area penalty and better noise immunity.

Abstract translation: 浮动栅极驱动器使用单端电平移位器将设置信号和由开关信号的上升沿和下降沿引起的复位信号转换为公共输出端，以产生双稳态电路的输出电压，以产生 电平转换开关信号。 在通过检测输出电压中的噪声所确定的良好瞬态检测信号的控制下，单端电平转换器和双稳态电路之间的屏蔽电路屏蔽输出电压中的噪声。 该配置具有较低的面积损失和更好的抗噪声能力。

公开(公告)号：US08704590B2

公开(公告)日：2014-04-22

申请号：US14032959

申请日：2013-09-20

Applicant: Richtek Technology Corporation

Inventor： Yung-Chih Lai ,  Isaac Y Chen ,  Chien-Fu Tang ,  Jiun-Hung Pan

IPC: G05F1/10

CPC classification number: G05B21/02 ,  H02M3/156 ,  H02M2001/0003

Abstract: A control circuit for a power converter includes a shared pin, a driving circuit, a current source, a sampling circuit, and a signal processing circuit. The shared pin is coupled with an output end of the power converter through a resistor. The driving circuit conducts a switch of the power converter. The current source provides a current to the resistor through the shared pin. The sampling circuit samples the signal on the shared pin for generating a first sampling value and a second sampling value. The signal processing circuit calculates a first difference between the first sampling value and a first reference value, and a second difference between the second sampling value and a second reference value. When the difference between the first difference and the second difference is less than a predetermined value, the signal processing circuit may therefore configure the conduction time or frequency of the switch.

Abstract translation: 用于功率转换器的控制电路包括共享引脚，驱动电路，电流源，采样电路和信号处理电路。 共享引脚通过电阻与功率转换器的输出端耦合。 驱动电路进行功率转换器的开关。 电流源通过共享引脚向电阻提供电流。 采样电路对共享引脚上的信号进行采样，以产生第一采样值和第二采样值。 信号处理电路计算第一采样值和第一参考值之间的第一差值，以及第二采样值和第二参考值之间的第二差值。 当第一差异和第二差异之间的差小于预定值时，信号处理电路可以配置开关的导通时间或频率。