公开(公告)号：US20140167648A1

公开(公告)日：2014-06-19

申请号：US14133229

申请日：2013-12-18

Applicant: Richtek Technology Corporation

Inventor： Leng-Nien HSIU ,  Pei-Yuan CHEN

IPC: H05B37/02

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：US08717091B2

公开(公告)日：2014-05-06

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: G05F1/10

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：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：US20130176758A1

公开(公告)日：2013-07-11

申请号：US13735652

申请日：2013-01-07

Applicant: Richtek Technology Corporation

Inventor： Pei-Kai TSENG ,  Jyun-Che HO ,  Chien-Fu TANG ,  Isaac Y. CHEN

IPC: H02M7/219

CPC classification number: H02M7/219 ,  H02M2007/2195 ,  Y02B70/1408

Abstract: A bridge rectifier is established by MOSFETs instead of diodes. The MOSFET bridge rectifier includes a voltage detector to detect the voltages of two AC input terminals of the MOSFET bridge rectifier, for identifying the positive and negative half cycles of an AC voltage input to the MOSFET bridge rectifier, thereby accurately controlling the MOSFETs.

Abstract translation: 由MOSFET代替二极管建立桥式整流器。 MOSFET桥式整流器包括用于检测MOSFET桥式整流器的两个AC输入端子的电压的电压检测器，用于识别输入到MOSFET桥式整流器的AC电压的正半周期和负半周期，从而精确地控制MOSFET。

公开(公告)号：US20250167740A1

公开(公告)日：2025-05-22

申请号：US18644121

申请日：2024-04-24

Applicant: Richtek Technology Corporation

Inventor： Wen-Hsuan Chang ,  Yi-Kuang Chen

IPC: H03F3/217

Abstract: A class-D amplifier for generating an output signal having PWM according to an input signal based on a DC voltage during a normal mode (NM) includes: a first integrator for generating a first integrated signal by integrating the difference of the input signal and a feedback signal during the NM; a final-stage integrator for generating a final-stage integrated signal by integrating the first integrated signal during the NM; a superposition circuit for generating a loop filter signal by buffering the final-stage integrated signal during the NM; and a modulation and driving circuit for generating the output signal by comparing the loop filter signal and a triangle wave. During a clipping mode, the first integrator enters a reset or a hold state, and the final-stage integrator enters the hold state, and the superposition circuit is configured to superimposes the final-stage integrated signal and a feedforward signal to generate the loop filter signal.

公开(公告)号：US12301280B2

公开(公告)日：2025-05-13

申请号：US18050784

申请日：2022-10-28

Applicant: Richtek Technology Corporation

Inventor： Jung-Sheng Chen ,  Chin-Yen Lin ,  Ching-Yu Chen ,  Ting-Jung Lo ,  Hsing-Shen Huang

IPC: H02M1/44 ,  H02M1/00 ,  H04B1/717

Abstract: A spread spectrum switching converter converts an input power to an output power. The spread spectrum switching converter includes a pulse width modulation (PWM) circuit and a pulse omission control circuit. The PWM circuit generate an initial PWM signal according to a feedback signal related to the output power. The initial PWM signal controls at least one switch to switch an inductor to generate the output power. The pulse omission control circuit generates a pulse omission control signal to mask a portion of pulses of the initial PWM signal, to thereby generate an adjusted PWM signal. The pulse omission control circuit randomly adjusts the pulse width of the pulse omission control signal according to a random control signal, such that the adjusted PWM signal has a spread spectrum characteristic.

公开(公告)号：US12267003B2

公开(公告)日：2025-04-01

申请号：US18145267

申请日：2022-12-22

Applicant: Richtek Technology Corporation

Inventor： Jung-Sheng Chen ,  Chih-Chun Chuang ,  Yong-Chin Lee

IPC: H02M1/32 ,  H02M1/08 ,  H02M3/158 ,  H03K3/037 ,  H03K5/24

Abstract: A power converter that properly copes with the wiring defects on a feedback path is shown. According to a control signal, a power driver couples an input voltage to an energy storage element to provide an output voltage that is down-converted from the input voltage. The output voltage is further converted into a feedback voltage by a feedback circuit, and is entered to an error amplifier with a reference voltage for generation of an amplified error. A control signal generator generates the control signal of the power driver according to the amplified error. The power converter specifically has a comparator, which is enabled in a soft-start stage till the output voltage reaches a stable status. The comparator compares the amplified error with a critical value. When the amplified error exceeds the critical value, the input voltage is disconnected from the energy storage element.

公开(公告)号：US12224683B2

公开(公告)日：2025-02-11

申请号：US18337154

申请日：2023-06-19

Applicant: Richtek Technology Corporation

Inventor： Tsan-Huei Wu ,  Tsung-Wei Huang ,  Ye-Sing Luo

IPC: H02M3/158 ,  H02J7/00 ,  H02M1/00 ,  H02M7/5395 ,  H02M3/156

Abstract: A power conversion system includes: first and second switches, a switching power converter, a battery switch and a conversion control circuit. In an external power mode, the first and second switches are controlled to generate an intermediate power from a first power and generate a second power from the intermediate power for powering an external load. In a battery power mode, the conversion control circuit controls the battery switch, the switching power converter and the second switch to generate a system power from a battery power, convert the system power to generate the intermediate power and generate the second power from the intermediate power. In the external power mode, the switching power converter is controlled to enter the battery power mode when the intermediate voltage is reduced to a transient state threshold, wherein a minimum voltage level of the intermediate power is close to a minimum voltage regulation level.