公开(公告)号：US20160171936A1

公开(公告)日：2016-06-16

申请号：US14954513

申请日：2015-11-30

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Der-Jiunn WANG ,  Chung-Hsien TSO ,  Chun-I LIN

IPC: G09G3/34 ,  G09G3/36

CPC classification number: G09G3/3655 ,  G09G2320/0247 ,  G09G2320/0673

Abstract: A Gamma curve correction method for an LCD sets a ground potential of the LCD as a common voltage, and adjusts at least one of a plurality of positive Gamma voltages and a plurality of negative Gamma voltages of the LCD such that the central value of a Gamma curve established by the positive Gamma voltages and the negative Gamma voltages becomes closer to the common voltage. As a result, flickers existing in the images of the LCD are improved.

Abstract translation: 用于LCD的伽马曲线校正方法将LCD的接地电位设置为公共电压，并且调整LCD的多个正伽马电压和多个负伽马电压中的至少一个，使得伽马的中心值 由正伽马电压和负伽马电压建立的曲线变得更接近于公共电压。 结果，存在于LCD的图像中的闪烁被改善。

公开(公告)号：US20160149497A1

公开(公告)日：2016-05-26

申请号：US14947233

申请日：2015-11-20

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Tzu-Chen Lin

IPC: H02M3/335

CPC classification number: H02M3/33507 ,  H02M1/15 ,  H02M7/06 ,  H02M2001/007

Abstract: A power converter circuit includes a transformer for converting a primary side voltage to a secondary side voltage and generating an output current. A power limit control unit senses the secondary side voltage to obtain a waveform feature of the primary side voltage, and decides a target of the output current according to the waveform feature of the primary side voltage. When the primary side voltage drops to a threshold, the output current is reduced.

Abstract translation: 电力转换器电路包括用于将初级侧电压转换为次级侧电压并产生输出电流的变压器。 功率限制控制单元感测次级侧电压以获得初级侧电压的波形特征，并且根据初级侧电压的波形特征来确定输出电流的目标。 当初级侧电压下降到阈值时，输出电流降低。

公开(公告)号：US09158315B2

公开(公告)日：2015-10-13

申请号：US13900181

申请日：2013-05-22

Applicant: Richtek Technology Corporation

Inventor： Wen-Wei Chen

IPC: G05F1/00 ,  G05F1/46

CPC classification number: G05F1/46 ,  H02M3/158 ,  H02M2001/0003

Abstract: A constant on time mode power supplier uses longer constant on time when the output voltage of the constant on time mode power supplier is drooped due to load variation, to increase energy provided to the output of the constant on time mode power supplier for preventing the output voltage from undershooting and shortening the time for the output voltage to recover stable.

Abstract translation: 恒定的时间模式电源供应商由于负载变化而使恒定导通时间模式电源的输出电压下降，使用更长的恒定导通时间，以增加提供给恒定时间模式电源的输出的能量，以防止输出 电压不足，缩短输出电压恢复稳定的时间。

公开(公告)号：US09130454B2

公开(公告)日：2015-09-08

申请号：US14206856

申请日：2014-03-12

Applicant: Richtek Technology Corporation

Inventor： Yen-Te Lee ,  Wen-Wei Chen ,  Wei-Yuan Ting

IPC: H02M3/158 ,  H02M3/156 ,  H02M1/00

CPC classification number: H02M3/156 ,  H02M3/1588 ,  H02M2001/0019 ,  H02M2001/0032 ,  Y02B70/16

Abstract: A control circuit of a power converter includes: a periodical signal generating circuit for generating a first filtered signal, a second filtered signal, and a periodical signal according to a second feedback signal corresponding to an inductor voltage of the power converter; a comparison circuit for comparing the error signal and the periodical signal to generate a comparison signal; a control signal generating circuit for generating a control signal to control power switches of the power converter according to the comparison signal; and a signal adjusting circuit. During a load transient period at which the load of the power converter changes from a relatively light load to a relatively heavy load, when a lower switch of the power converter is turned on, the signal adjusting circuit reduces an output current of the periodical signal generating circuit to increase a loop response of the power converter.

Abstract translation: 功率转换器的控制电路包括：周期信号发生电路，用于根据对应于功率转换器的电感器电压的第二反馈信号产生第一滤波信号，第二滤波信号和周期信号; 比较电路，用于比较误差信号和周期信号以产生比较信号; 控制信号发生电路，用于根据比较信号产生控制功率转换器的功率开关的控制信号; 和信号调节电路。 在功率转换器的负载从相对较轻的负载变化到相对较重的负载的负载瞬态期间，当功率转换器的下部开关接通时，信号调节电路减少周期性信号产生的输出电流 电路来增加功率转换器的回路响应。

公开(公告)号：US09093463B1

公开(公告)日：2015-07-28

申请号：US14537424

申请日：2014-11-10

Applicant: Richtek Technology Corporation

Inventor： Chung-Yu Hung ,  Jian-Hsing Lee ,  Tzu-Cheng Kao ,  Tsung-Yi Huang

IPC: H01L21/336 ,  H01L29/66 ,  H01L29/737

CPC classification number: H01L29/66393 ,  H01L27/0262 ,  H01L29/0649 ,  H01L29/737 ,  H01L29/87

Abstract: A silicon controlled rectifier includes: a substrate; a N well and a P well positioned on a side of the substrate and contact with each other; a first N region and a first P region positioned on an upper surface of the N well and contact with each other; a second N region and a second P region positioned on an upper surface of the P well and contact with each other; a first oxide isolation region isolating the first P region and the second N region; a second oxide isolation region isolating the second N region and the second P region; an anode terminal coupled with the first N region and the first P region; and a cathode terminal coupled with the second N region and the second P region. The first P region has a doping concentration less than 80% of that of the second P region.

Abstract translation: 可控硅整流器包括：基板; N阱和P阱定位在基板的一侧并彼此接触; 第一N区和第一P区，位于N阱的上表面并彼此接触; 第二N区和第二P区，位于P阱的上表面并彼此接触; 隔离所述第一P区和所述第二N区的第一氧化物隔离区; 隔离所述第二N区域和所述第二P区域的第二氧化物隔离区域; 与所述第一N区和所述第一P区耦合的阳极端; 以及与第二N区域和第二P区域耦合的阴极端子。 第一P区的掺杂浓度小于第二P区的掺杂浓度的80％。

公开(公告)号：US09088204B2

公开(公告)日：2015-07-21

申请号：US13913050

申请日：2013-06-07

Applicant: Richtek Technology Corporation

Inventor： Li-Wen Fang ,  Ping-Ching Huang ,  Cheng-Kuang Lin ,  An-Tung Chen

IPC: G05F1/00 ,  H02M3/04 ,  H02M1/08

CPC classification number: H02M3/04 ,  H02M1/08

Abstract: A control circuit of a switching regulator includes a control pin for coupling with an external resistor; a resistor detecting circuit for detecting a resistance of the external resistor; a current generating module for generating a corresponding control current according to a detection result of the resistor detecting circuit; an oscillating circuit for generating a clock signal; and a mode-switching circuit. When the mode-switching circuit configures the oscillating circuit to operate in a resistor-controlled mode, the oscillating circuit generates the clock signal according to the control current so that the clock signal has a frequency corresponding to the resistance of the external resistor. When the mode-switching circuit configures the oscillating circuit to operate in a signal-controlled mode, the oscillating circuit generates the clock signal according to an external synchronous signal coupled with the control pin so that the clock signal is synchronized with the external synchronous signal.

Abstract translation: 开关调节器的控制电路包括用于与外部电阻器耦合的控制引脚; 用于检测外部电阻器的电阻的电阻检测电路; 电流产生模块，用于根据电阻检测电路的检测结果产生相应的控制电流; 用于产生时钟信号的振荡电路; 和模式切换电路。 当模式切换电路将振荡电路配置为以电阻器控制模式工作时，振荡电路根据控制电流产生时钟信号，使得时钟信号具有与外部电阻器的电阻相对应的频率。 当模式切换电路将振荡电路配置为以信号控制模式工作时，振荡电路根据与控制引脚耦合的外部同步信号产生时钟信号，使得时钟信号与外部同步信号同步。

公开(公告)号：US20150162843A1

公开(公告)日：2015-06-11

申请号：US14560774

申请日：2014-12-04

Applicant: Richtek Technology Corporation

Inventor： Isaac Y. CHEN ,  Chien-Fu TANG ,  Hsin-Yi WU

IPC: H02M3/335

CPC classification number: H02M3/33523 ,  H02M1/32 ,  H02M2001/0022

Abstract: A control circuit for a power converting circuit includes a multifunctional pin, a pulse-width-modulation (PWM) signal generating circuit, a voltage detecting circuit and a zero current detecting circuit. The voltage detecting circuit detects a signal on the multifunctional pin. When the signal on the multifunctional pin is greater than a predetermined value, the voltage detecting circuit configures the PWM signal generating circuit to intermittently conduct a current switch of the power converting circuit. The zero current detecting circuit detects the signal of the multifunctional pin to determine the conduction status of the current switch. When the signal of the multifunctional pin is less than the predetermined value, the voltage detecting circuit configures the PWM signal generating circuit to turn off the current switch.

Abstract translation: 电力转换电路的控制电路包括多功能引脚，脉冲宽度调制（PWM）信号发生电路，电压检测电路和零电流检测电路。 电压检测电路检测多功能引脚上的信号。 当多功能引脚上的信号大于预定值时，电压检测电路将PWM信号产生电路配置为间歇地导通电力转换电路的电流开关。 零电流检测电路检测多功能引脚的信号，以确定电流开关的导通状态。 当多功能引脚的信号小于预定值时，电压检测电路配置PWM信号产生电路以关断电流开关。

公开(公告)号：US09024607B2

公开(公告)日：2015-05-05

申请号：US13789287

申请日：2013-03-07

Applicant: Richtek Technology Corporation

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

IPC: H02M3/157 ,  H02M7/06 ,  H02M3/156 ,  H02M1/42

CPC classification number: H02M7/06 ,  H02M1/4225 ,  H02M3/156 ,  Y02B70/126

Abstract: A control circuit for a power converter has a current source, a sampling circuit, a signal processing circuit, a driving circuit, and a shared pin. The shared pin is used for coupling with a resistor and a switch. The current source, coupled with the shared pin, provides a current through the shared pin to the resistor in a first period. The sampling circuit, coupled with the shared pin, samples signals on the shared pin for generating a first sampling value and a second sampling value. The signal processing circuit, coupled with the sampling circuit, compares the first sampling value and the second sampling value. The driving circuit generates driving signals for conducting the switch. When the difference of the first sampling value and the second sampling value is less than a predetermined value, the signal processing circuit configures the driving circuit to intermittently conduct the switch in a second period.

Abstract translation: 用于功率转换器的控制电路具有电流源，采样电路，信号处理电路，驱动电路和共享引脚。 共享引脚用于与电阻和开关耦合。 与共享引脚耦合的电流源在第一周期内通过共享引脚提供电流到电阻器。 与共享引脚耦合的采样电路在共享引脚上采样信号以产生第一采样值和第二采样值。 与采样电路耦合的信号处理电路比较第一采样值和第二采样值。 驱动电路产生用于导通开关的驱动信号。 当第一采样值和第二采样值的差小于预定值时，信号处理电路将驱动电路配置为在第二周期内间歇地导通开关。

公开(公告)号：US20140268924A1

公开(公告)日：2014-09-18

申请号：US13928974

申请日：2013-06-27

Applicant: Richtek Technology Corporation

Inventor： Chien-Fu TANG ,  Isaac Y. CHEN

IPC: H02M3/335

CPC classification number: H02M3/33507 ,  H02M2001/0025

Abstract: A control circuit of a flyback power converter includes a first reference signal generating circuit for generating a first reference signal; a reference signal adjusting circuit for generating an adjustment signal according to the first reference signal and a test signal corresponding to an output voltage signal of the flyback power converter, and to generate a second reference signal according to the adjustment signal and the first reference signal; an error detection circuit for generating an error signal according to the second reference signal and a feedback signal; and a control signal generating circuit for generating a control signal according to the error signal to control operations of a power switch to thereby adjust the test signal. The feedback signal corresponds to a current flowing through a primary side coil of the power converter or a sensing voltage of an inductive coil of the power converter.

Abstract translation: 回扫功率转换器的控制电路包括：第一参考信号发生电路，用于产生第一参考信号; 参考信号调整电路，用于根据第一参考信号产生调整信号和对应于回扫功率转换器的输出电压信号的测试信号，并根据调整信号和第一参考信号产生第二参考信号; 误差检测电路，用于根据第二参考信号和反馈信号产生误差信号; 以及控制信号发生电路，用于根据误差信号产生控制信号，以控制电源开关的操作，从而调整测试信号。 反馈信号对应于流过功率转换器的初级侧线圈的电流或功率转换器的感应线圈的感测电压。

公开(公告)号：US20140210432A1

公开(公告)日：2014-07-31

申请号：US14162406

申请日：2014-01-23

Applicant: Richtek Technology Corporation

Inventor： Ming-Jun HSIAO ,  Teng-Hung CHANG ,  Shao-Ming SUN

IPC: H02M1/00

CPC classification number: H03F1/0233 ,  H03F1/0211 ,  H03F1/0255

Abstract: A voltage adjusting circuit includes a reference voltage generating circuit, a subtractor circuit, a threshold generating circuit and a comparator circuit. The voltage adjusting circuit may provide power supply signals to an amplifier circuit so that the amplifier circuit may provide an output signal to a load according to an input signal. The subtractor circuit generates a difference signal according to the output signal and the power supply signal. The comparator circuit compares the difference signal and a threshold signal generated by the threshold generating circuit for configuring the reference voltage generating circuit to adjust the signal value of the power supply signal.

Abstract translation: 电压调节电路包括基准电压产生电路，减法器电路，阈值产生电路和比较器电路。 电压调节电路可以向放大器电路提供电源信号，使得放大器电路可以根据输入信号向负载提供输出信号。 减法器电路根据输出信号和电源信号产生差分信号。 比较器电路比较差分信号和由阈值产生电路产生的阈值信号，用于配置参考电压产生电路以调整电源信号的信号值。