Richtek Technology Corporation

Richtek Technology Corporation, R.o.c

Taiwan Semiconductor Manufacturing Comp. Ltd.

Other

Richtek Technologies Corporation, R.o.c.

Richtex Technology Corp.

Richtek Technology Company Ltd

Jing-Meng Liu

Hung-Der Su

Liang-Pin Tai

Chung-Lung Pai

Chia-Wei Liao

Chiawei Liao

Kwan-Jen Chu

Chao-Hsuan Chuang

Leng-Nien Hsiu

Jian-Hsing Lee

Yi-Hsun Wu

Jiaw-Ren Shih

Cheng-Hsuan Fan

Hung-I Wang

Pei-Yuan Chen

Ta-Yung Yang

Isaac Y Chen

Nien-Hui Kung

An-Tung Chen

Pei-Cheng Huang

Tzu-Chen Lin

Wei-Hsin Wei

Chao-Chieh Tsai

Jwin-Yen Guo

Chia-Shiung Tsai

Chi-Wen Liu

Tsu Shih

Shui-Mu Lin

Chun-Yen Huang

Roland Van Roy

Kent Hwang

Shwu-Liang Hsieh

Der-Jiunn Wang

Pao-Chuan Lin

Po-Shun Chung

Sheng-Jyh Wu

Wen-Hung Huang

Ching-Jung Tseng

Jian-Rong Huang

Jo-Yu Wang

ChaoChieh Tsai

Shao-Yu Wang

Shao-Hung Lu

Li-Wei Lee

Wei-Che Chiu

Jau-Jey Wang

Shih-Hui Chen

Chih-Ching Wang

Boon-Khim Liew

Shao-Ming Sun

Chien-Sheng Chen

Jian-Ren Shih

Dah-Chih Lin

Chiang-Yung Ku

Peng-Ju Lan

Yuan-Huang Cheng

Xiaoyong Zhang

Shen Tu

Heng Yun

Jui-Li Lan

Chun-Chin Tung

Shin-Lung Ho

Cheng-Yuan Chang

Yang-Ping Hung

Hsien-Ming Chiu

A light emitting device current regulator circuit is disclosed. A light emitting device circuit has a first end for receiving light emitting device operation power, and a second end. The light emitting device current regulator circuit includes: an internal voltage generation circuit coupled to the second end, for generating an internal voltage according to a second end voltage to supply electrical power to the light emitting device current regulator circuit, wherein the supply voltage generation circuit includes a charge storage device for storing charges from the second end voltage to generate the supply voltage; and a current control circuit coupled to the second end, the current control circuit regulating the light emitting device current according to a control signal, wherein the control signal at least intermittently reduces the light emitting device current to zero or low current in order to raise the second end voltage.

Light emitting device current regulator circuit and control method thereof

An adaptive buck converter of a charging cable includes: a power receiving interface for receiving a DC voltage and a cable current from a cable; a terminal communication interface for transmitting a charging voltage and a charging current to a connection terminal of the charging cable and for receiving a communication signal generated by a mobile device from the connection terminal; a power converting circuit for receiving the DC voltage and the cable current from the power receiving interface and for generating the charging voltage and the charging current; a monitor circuit arranged to operably detect the DC voltage or the cable current; and a data processing circuit configured for controlling the power converting circuit according to the communication signal. The data processing circuit further communicates with the mobile device through the terminal communication interface and the connection terminal in response to a detection result of the monitor circuit.

Adaptive buck converter with monitor circuit and charging cable using the same

An adaptive buck converter of a charging cable includes: a power receiving interface for receiving a DC voltage and a cable current from a cable; a terminal communication interface for transmitting a charging voltage and a charging current to a connection terminal of the charging cable and for receiving a communication signal generated by the mobile device from the connection terminal; a power converting circuit for receiving the DC voltage and the cable current from the power receiving interface and for generating the charging voltage and the charging current, wherein the charging voltage is lower than the DC voltage while the charging current is greater than the cable current; and a data processing circuit coupled with the power converting circuit and configured for controlling the power converting circuit according to the communication signal.

Adaptive buck converter and charging cable using the same

The present invention discloses a high efficiency charging system and a charging circuit therein. The high efficiency charging system includes a power supplier and a power receiver, which are connected via a transmission wire so that power is transmitted from the power supplier to the power receiver. The power receiver includes a voltage conversion circuit and a control circuit. The voltage conversion circuit converts an adjustable input voltage provided by the power supplier to an output voltage and generates an output current for charging a battery. The voltage conversion circuit adaptively adjusts the output current according to a voltage drop between the adjustable input voltage and the output voltage. The control circuit senses the adjustable input voltage and the output voltage and instructs the power supplier to adjust the output voltage according to the voltage drop between the adjustable input voltage and output voltage.

High efficiency charging system and charging circuit therein

The present invention discloses a backlight control circuit with flexible configuration, comprising: a light emitting device path; a current source for controlling the current amount on the light emitting device path, the current source receiving a relatively high reference voltage in a first state, and receiving a relatively low reference voltage in a second state; and a current source control circuit for controlling the current source, whereby when the light emitting device path is in normal use, the current source is set to the first state, and when the light emitting device path is not in normal use, the current source is set to the second state.

Backlight control circuit with flexible configuration

The present invention discloses a power supply circuit with power factor correction (PFC) function, and an automatic gain control circuit therefor and a control method thereof. The power supply circuit includes the automatic gain control circuit and a load driver circuit. The automatic gain control circuit converts an input voltage to a regulation voltage, and the load driver circuit generates an output current according to the regulation voltage. The automatic gain control circuit automatically adjust the regulation voltage such that the regulation voltage has a substantially fixed amplitude or fixed average value under different input voltages of different specifications, and the output current provided by the load driver circuit varies in phase with the input voltage to provide a PFC function.

Power supply circuit with PFC function, and automatic gain control circuit therefor and control method thereof

The invention provides an analog photovoltaic power circuit with auto zero calibration, which judges whether the current trend or voltage trend has the same direction as or different direction from the power trend, and adjusts an input/output power conversion accordingly, so that an input current approaches to an optimum current corresponding to a maximum power point, in which the judgments of the current trend, voltage trend and power trend is calibrated with auto-zero circuitry.

Analog photovoltaic power circuit with auto zero calibration

The present invention discloses an isolated power converter circuit and a control method thereof. The isolated power converter circuit includes: a transformer circuit, a power switch circuit, an opto-coupler circuit, and a control circuit. The transformer circuit includes a first winding and a second winding. The power switch circuit is coupled to the transformer circuit to control it according to a driving signal. The opto-coupler circuit generates a feedback signal. The control circuit is coupled to the power switch circuit and the opto-coupler circuit, for generating the driving signal according to the feedback signal. The control circuit includes a distinguishing circuit for distinguishing a status of the feedback signal.

Isolated power converter circuit and control method thereof

The present invention discloses a backlight control circuit, comprising: a voltage supply circuit for receiving an input voltage and generating an output voltage under control by a control signal; at least one voltage comparison path respectively coupled to at least one light emission device path; a voltage operative amplifier circuit for generating the control signal according to a lowest voltage on the at least one voltage comparison path; and at least one under current detection circuit for detecting whether a corresponding one of the at least one light emission device path is in an under current status, whereby when anyone of the under current detection circuits detects the under current status, it sends an exclusion signal excluding a corresponding one of the at least one voltage comparison path from being an effective input of the voltage operative amplifier.

Backlight control circuit with under current detection and start-up control

A boundary conduction mode (BCM) switching regulator controls a power stage to convert an input voltage to an output voltage or output current. The BCM switching regulator detects whether it is operating in continuous conduction mode (CCM) or discontinuous conduction mode (DCM), and adjusts the On-time, Off-time, or frequency of the power stage accordingly, so that the switching regulator operates in or near BCM.

Boundary conduction mode switching regulator and driver circuit and control method thereof

The present invention discloses a switching regulator and a control circuit and a control method thereof. The switching regulator generates a compensation signal according to a feedback signal, and generates a driving signal according to the compensation signal, to control a power stage for converting an input voltage to an output voltage. The compensation signal is adjusted according to the input voltage, such that when the input voltage is equal to or lower than a predetermined level, the compensation signal is kept at a predetermined value.

Switching regulator and control circuit and control method thereof

The present invention discloses a light emitting device circuit and a control method thereof. The light emitting device circuit includes: a light emitting device control circuit, for converting an input voltage to an output voltage according to a control signal, wherein the output voltage is supplied to a light emitting device circuit; a voltage supply circuit, which is coupled to the light emitting device circuit, for generating a supply voltage from the output voltage; and a remote control circuit, which is coupled to the voltage supply circuit, for receiving the supply voltage, and generating the control signal according to a remote signal.

Light emitting device driver circuit and control method thereof

The present invention discloses a current splitter circuit for splitting a supply current to multiple light emitting device strings of a light emitting device array. The current splitter circuit includes: a minimum selector circuit coupled to the multiple light emitting device strings to generate a minimum signal which indicates a minimum voltage of the light emitting device strings; and multiple current source circuits each including a first current source end coupled to a corresponding light emitting device string, a second current source end coupled to ground, and a current source control end receiving a current control signal related to the minimum signal, so as to control currents through the corresponding light emitting device string.

Light emitting device array driver circuit and current splitter circuit and method of splitting current therefor

Growing community of inventors

Jubei, Taiwan

Jing-Meng Liu