公开(公告)号：US20160308449A1

公开(公告)日：2016-10-20

申请号：US15192187

申请日：2016-06-24

Applicant: Richtek Technology Corporation

Inventor： Jiun-Hung PAN ,  Chien-Fu TANG ,  Jyun-Che HO ,  Isaac Y. CHEN ,  Yu-Chang CHEN ,  Jung-Pei CHENG

IPC: H02M3/335 ,  H02M1/08

CPC classification number: H02M3/33507 ,  H02M1/08 ,  H02M3/156 ,  H02M3/157 ,  H02M3/33515 ,  H02M3/33523 ,  H02M7/217 ,  H02M2001/0009

Abstract: An AC-to-DC power converter with a BJT as a power switch can set a base current of the BJT by a current setting resistor which is in the outside of a control integrated circuit. Since an output current and a recovery current of the BJT are injected into a sensing resistor, the AC-to-DC power converter can correctly detect an inductor current thereof from the sensing resistor.

Abstract translation: 具有BJT作为电源开关的AC至DC电力转换器可以通过位于控制集成电路外部的电流设定电阻来设定BJT的基极电流。 由于BJT的输出电流和恢复电流被注入到感测电阻器中，所以AC到DC功率转换器可以从感测电阻器正确地检测其电感电流。

公开(公告)号：US20170005647A1

公开(公告)日：2017-01-05

申请号：US15267454

申请日：2016-09-16

Applicant: Richtek Technology Corporation

Inventor： Jiun-Hung PAN ,  Chien-Fu TANG ,  Isaac Y. CHEN

IPC: H03K7/08 ,  H02M1/44 ,  H02M1/08 ,  H02M3/335

CPC classification number: H03K7/08 ,  H02M1/08 ,  H02M1/44 ,  H02M3/156 ,  H02M3/33507 ,  H02M3/33515 ,  H02M3/33523 ,  H02M3/33546 ,  H02M2001/0009 ,  H02M2003/1566 ,  H03K2005/00019

Abstract: A frequency jittering control circuit for a PFM power supply includes a pulse frequency modulator to generate a frequency jittering control signal to switch a power switch to generate an output voltage. The frequency jittering control circuit jitters an input signal or an on-time or off-time of the pulse frequency modulator to jitter the switching frequency of the power switch to thereby improve EMI issue.

Abstract translation: 用于PFM电源的频率抖动控制电路包括脉冲频率调制器，用于产生频率抖动控制信号以切换电源开关以产生输出电压。 频率抖动控制电路使脉冲频率调制器的输入信号或导通时间或关断时间抖动，以抖动电源开关的开关频率，从而改善EMI问题。

公开(公告)号：US20130113450A1

公开(公告)日：2013-05-09

申请号：US13672125

申请日：2012-11-08

Applicant: Richtek Technology Corporation

Inventor： Chien-Fu TANG ,  Jiun-Hung PAN ,  Isaac Y. CHEN

IPC: G05F1/10

CPC classification number: G05F1/10 ,  H02M1/00 ,  H02M2001/0025 ,  Y02B70/126

Abstract: A mixed mode compensation circuit and method for a power converter generate a digital signal according to a reference value and a feedback signal which is related to the output voltage of the power converter, convert the digital signal into a first analog signal, offset the first analog signal with a variable offset value to generate a second analog signal, and filter out high-frequency components of the second analog signal to generate a third analog signal for stable output voltage of the power converter. The mixed mode compensation does not require large capacitors, and thus the circuit can be integrated into an integrated circuit.

Abstract translation: 用于功率转换器的混合模式补偿电路和方法根据参考值和与功率转换器的输出电压相关的反馈信号产生数字信号，将数字信号转换成第一模拟信号，偏移第一模拟信号 具有可变偏移值的信号以产生第二模拟信号，并且滤除第二模拟信号的高频分量以产生用于功率转换器的稳定输出电压的第三模拟信号。 混合模式补偿不需要大电容，因此电路可以集成到集成电路中。

公开(公告)号：US20140022010A1

公开(公告)日：2014-01-23

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: G05B21/02

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。

公开(公告)号：US20130342127A1

公开(公告)日：2013-12-26

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：US20130234790A1

公开(公告)日：2013-09-12

申请号：US13796547

申请日：2013-03-12

Applicant: RICHTEK TECHNOLOGY CORPORATION

Inventor： Yung-Chih LAI ,  Isaac Y. CHEN ,  Chien-Fu TANG ,  Jiun-Hung PAN

IPC: G05B21/02

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

Abstract: A control circuit for a power converter is disclosed, having a shared pin, a driving circuit, a current source, a sampling circuit, and a signal processing circuit. The shared pin is used for coupling with an output end of the power converter through a resistor. The driving circuit is used for conducting 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. When the difference between the first sampling value and the second sampling value is less than a predetermined value, the signal processing circuit configures the driving circuit to adjust at least one of the conduction time and the conduction frequency of the switch according to an output signal of the power converter received from the shared pin.

Abstract translation: 公开了一种用于功率转换器的控制电路，其具有共享引脚，驱动电路，电流源，采样电路和信号处理电路。 共享引脚用于通过电阻与功率转换器的输出端耦合。 驱动电路用于导通电源转换器的开关。 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。 当第一采样值和第二采样值之间的差小于预定值时，信号处理电路将驱动电路配置为根据输入信号的输入信号调整开关的导通时间和导通频率中的至少一个 从共享引脚接收功率转换器。

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：US20140328087A1

公开(公告)日：2014-11-06

申请号：US14266566

申请日：2014-04-30

Applicant: Richtek Technology Corporation

Inventor： Chien-Fu TANG ,  Jiun-Hung PAN ,  Isaac Y. CHEN

IPC: H02M3/335

CPC classification number: H02M3/156 ,  H02M2001/0009

Abstract: An apparatus and a method for implementing a multiple function pin in a boundary conduction mode power supply, uses a same pin to switch a power switch and to achieve zero current detection to reduce pin count and save cost of a control integrated circuit. A first voltage is applied to the multiple function pin to turn on the power switch, and then a second voltage is applied to the multiple function pin after the power switch has been turned on for a first time, to thereby turn off the power switch. After the power switch has been turned off for a second time, a third voltage is applied to the multiple function pin keep the power switch off. Preferably, a tristate output driver is used to provide the first and second voltages, and a clamping circuit is used to provide the third voltage.

Abstract translation: 在边界导通模式电源中实现多功能引脚的装置和方法，使用相同的引脚切换电源开关，实现零电流检测，减少引脚数，节省控制集成电路的成本。 向多功能引脚施加第一电压以接通电源开关，然后在电源开关第一次接通之后，向多功能引脚施加第二电压，从而关闭电源开关。 电源开关第二次关闭后，第三个电压被施加到多功能引脚上，保持电源开关的不动作。 优选地，使用三态输出驱动器来提供第一和第二电压，并且使用钳位电路来提供第三电压。

公开(公告)号：US20130235633A1

公开(公告)日：2013-09-12

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: H02M7/06

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。