Chunghwa Picture Tubes, Ltd.

Industrial Technology Research Institute

Richtek Technology Corporation

National Yang Ming Chiao Tung University

Realtek Semiconductor Inc.

Alpha Omega Semiconductor Inc.

Anpec Electronics Corporation

Diodes Inc.

Anwell Semiconductor Corp.

Taiwan Semiconductor Manufacturing Comp. Ltd.

Novatek Microelectronics Corp.

Faraday Technology Corporation

Elite Semiconductor Memory Technology, Inc

National Science Council of Republic of China

Ricktek Technology Corporation

Ke-Horng Chen

Chi-Neng Mo

Chia-Lin Liu

Hsin-Hsin Ho

Sy-Yen Kuo

Yu-Huei Lee

Chun-Yu Hsieh

Li-Ren Huang

Chi-Lin Chen

Hong-Wei Huang

Wei-Quan Wu

Han-Ping D Shieh

Chiao-Shun Chuang

Ming-Hsin Huang

Chun-Ho Chen

Jean-Shin Wu

Chun-Chieh Kuo

Shih-Ping Tu

Shao-Wei Chiu

Shih-Jung Wang

Shih-Wei Wang

Huai-An Li

Shian-Jun Chiou

Ta-Chuan Kuo

Chao-Jen Huang

Ti-Ti Liu

Ling Li

Chih-Chung Chen

Dau-Chen Huang

Ming-Tan Hsu

Long-Der Chen

Cheng-Po Hsiao

Ke-Ming Su

Chia-Lin Chiu

Shih-Meng Chang

Yao-Yi Yang

Shen-Yu Peng

Yi-Ping Su

Kuo-Lin Zheng

Ying-Feng Wu

Yu-Chou Ko

Yi-Pai Huang

Kuo-Chi Liu

Ya-Ting Chang

Ying-Hsi Lin

Yu-Chen Lin

Chih-Heng Su

Tzi-Dar Chiueh

Chih-Chung Chiu

Tsung-Yen Tsai

Te-Sheng Chen

Tzu-Yang Yen

Yi-Chun Chen

Fang-Cheng Lin

Ying-Hsiang Wang

Tzong-Honge Shieh

Chi-Chung Tsai

Ming-Wei Lin

Tzu-hsien Yang

I-Cheng Shih

Lan-Shan Cheng

Yun-Li Liu

Chih-Wei Chang

Che-Hao Meng

Yuan-Hung Wang

Yueh-Lung Kuo

Hsuan-Yu Tsai

Sheau-Fang Lei

Hun-Wei Chen

Hao-Yuan Lin

Chi-Chung Liao

Ping-Ching Huang

Shin-Chi Lai

Ming-Tsung Ho

Shin-Hao Chen

Hung-Yi Teng

Pai-Wei Cheng

Pin-Chin Huang

Ying Hsi Lin

Ruei-Ming Gan

Cheng-Ta Yu

Yan-Fu Jhou

Chung-Hsin Huang

Chao-Chang Chiu

Yu-Nong Tsai

Ming-Yan Fan

Yung-Chih Lai

Kuo-Chen Kao

Yung-Hsin Lin

Kai-Chang Chuang

Chia-Wrong Chang

Le-Shian Liu

Tzung-Ling Tsai

Chien-Fang Peng

Shang-Hsien Yang

Shih-Min Chen

Ching Long Lin

Chih-Yu Yang

Kuo-Lin Cheng

Yong-Hwa Wen

A control device includes a first capacitor, a drive controller, a constant current source, a discharge-controlled current source, a current mirror, and a sample-and-hold circuit. The constant current source generates a constant current. The discharge-controlled current source is coupled to the constant current source and the first capacitor. The current mirror is coupled to the first capacitor and the primary side of a primary-side switch. The current mirror generates a copy current, thereby generating a copy voltage across the first capacitor. When the drive controller turns on the primary-side switch, the sample-and-hold circuit drives the discharge-controlled current source to sample and hold a control current from the constant current and the copy current. When the node voltage is higher than the copy voltage, the comparison circuit drives the drive controller to turn off the primary-side switch.

Control device

A driving circuit device includes a first current source, a second current source, a first common-mode current elimination (CMCE) circuit, a second common-mode current elimination (CMCE) circuit, a current-to-voltage converter, and a first comparator. The current sources provide constant currents. The current-to-voltage converter includes a first current mirror and a second current mirror. The control terminal of the first current mirror is coupled to the second CMCE circuit. The control terminal of the second current mirror is coupled to the first CMCE circuit. The first current mirror and the second current mirror receive the constant currents, common-mode currents, and differential currents, thereby controlling the first CMCE circuit and the second CMCE circuit to generate a voltage difference that excludes a common-mode voltage corresponding to the common-mode currents. The first comparator receives the voltage difference to drive a field-effect transistor.

Driving circuit device

An apparatus includes a capacitive device configured to provide bias power for a high-side switch, a gate drive path having variable resistance connected between the capacitive device and a gate of the high-side switch, wherein the gate drive path having variable resistance is of a first resistance value in response to a turn-on of the high-side switch, and the gate drive path having variable resistance is of a second resistance value in response to a turn-off of the high-side switch, and wherein the second resistance value is greater than the first resistance value, and a control switch connected between the gate of the high-side switch and ground.

Gate drive apparatus and control method

A driving method for a multiple frequency coupling generator is provided. The method includes: in normal operations, interpreting an input digital control signal transmitted from a digital signal processor into an interpreted digital control signal; interpreting the interpreted digital control signal into a plurality of magnetic coupling signals by a magnetic coupling switch circuit; performing signal recovery and differential delay on the magnetic coupling signals by an interlocking circuit for reducing time difference and signal loss of the magnetic coupling signals; and when the interlocking circuit determines that the magnetic coupling signals have substantially no time difference and no signal loss, transforming the magnetic coupling signals into a first driving signal and a second driving signal by a switch circuit, a driver circuit and an output pad group to drive a backend driving loop.

High power multiple frequency coupling generator and driving method thereof

The invention uses the control circuit formed on the silicon wafer to detect the leakage current of transistor formed on the depletion mode GaN wafer and then adjust the gate voltage of the depletion mode GaN transistor according to the detected leakage current. Essentially, the gate voltage is reduced or viewed as made more negative when the detected leakage current is larger a specific value. Thus, the gate voltage can be gradually adjusted to approach a specific threshold voltage that right block the leakage current. In other words, by making the gate voltage more negative when non-zero leakage current is detected and even by making the gate voltage more positive when zero leakage current is detected, the depletion mode GaN transistor can be adjusted to have an acceptable or even zero leakage current, a high reaction rate and an optimized efficiency.

Depletion mode GaN transistor control circuit and corresponding method

Gate drive apparatus control method

A wireless power transmitter circuit includes a power converter circuit, a power inverter circuit, an LC circuit, a resonant transmitter circuit, and a control circuit. The LC circuit includes an inductor and a capacitor, wherein an reactance of the LC circuit is substantially zero. The LC circuit is for converting the AC output current to a coil current. The resonant transmitter circuit includes at least one transmitter coil and a variable capacitor circuit, wherein the coil current flows through the at least one transmitter coil to generate a resonant wireless power. The control circuit generates a capacitance adjustment signal for adjusting an impedance of the variable capacitor circuit, such that the resonant transmitter circuit substantially operates in an impedance matched condition.

Wireless power transmitter circuit and control circuit and control method thereof

An envelope-tracking power supply modulator (ETSM) supplies power to a radio frequency power amplifier (RFPA) of a radio frequency (RF) circuit according to a baseband envelope signal. The ETSM includes a linear amplifier, a capacitor, a single inductor multiple output (SIMO) switch-mode converter, and a controller. The linear amplifier receives the baseband envelope signal, and has its output terminal coupled to a power input of the RFPA. One terminal of the capacitor is coupled to a reference voltage, and the other terminal is coupled to a power input of the linear amplifier. The SIMO switch-mode converter includes two output terminals. One of the output terminals is coupled to the capacitor and the power input of the linear amplifier, and the other of the output terminals is coupled to the output terminal of the linear amplifier and the power input of the RFPA. The controller controls the SUMO switch-mode converter.

Envelope-tracking power supply modulator

A self-excited power conversion circuit for secondary side control output power includes a comparator unit and a transistor installed directly in a secondary side output module, and the comparator unit is electrically coupled to at least one load, and the transistor is electrically coupled between to a conversion module of the circuit and the load. The comparator unit is provided for adjusting the duty cycle of the transistor after detecting the amount of energy outputted from the conversion module to the load from, so as to adjust the amount of energy actually received by the load to achieve a constant power effect.

Self-excited power conversion circuit for secondary side control output power

A knee voltage detector for a flyback converter is provided. The knee voltage detector comprises a delay unit, for delaying an auxiliary related voltage for a specific period, to generate a delay signal; a subtracting unit, for generating a subtraction signal according to the auxiliary related voltage and the delay signal; a comparing unit, for generating a sampling signal when the subtraction signal indicates that a voltage difference between the auxiliary related voltage and the delay signal is greater than a threshold; and a sample and hold unit, for sampling the delay signal to generate a knee voltage according to the sampling signal when the voltage difference between the auxiliary related voltage and the delay signal is greater than the threshold.

Knee voltage detector

A voltage regulator and a control method thereof are provided to dynamically adjust an output voltage. The voltage regulator comprises a plurality of switching transistors and a control circuit. The first end of each switching transistor receives a driving voltage, and the second end of each switching transistor is electrically connected to the end which outputs the output voltage. The input end and the feedback end of the control circuit respectively receive a reference voltage and the output voltage. A plurality of output ends of the control circuit are electrically connected to the control ends of the switching transistors respectively. Switching transistors adjust the output voltage. The control circuit compares the output voltage with the reference voltage, and selectively turns the switching transistors on or off according to the comparison between the output voltage and the reference voltage, to control the output voltage to approach the reference voltage.

Voltage regulator and control method thereof

An automatic tracking collision avoidance method has following steps: taking images in front of an origin vehicle by at least two photograph units; the images delivering to a calculation assembly, to transform the images from three primary colors images to grey images; having a relative vehicle speed of the front vehicle corresponded to the original vehicle according to the grey images; and according to the grey images the calculation assembly having a relative vehicle speed that the front vehicle corresponded to the original vehicle; the calculation assembly having a safe distance according to the relative vehicle speed, if the safe distance is great than a distance that between the original vehicle and the front vehicle, an alarm module generating an alert signal.

Automatic tracking collision avoidance system and method thereof

In an LED dimming and driving method and its circuit, a receiver, a current source and a controller are installed in a dimming module, and after the receiver has received a dimming signal, the current source is driven to output a current with a magnitude corresponsive to the dimming signal, and then after the controller has converted the current into a voltage level by a terminal resistor, the magnitude of the driving current of the LED is adjusted according to the voltage level to improve a linear dimming accuracy.

LED dimming and driving method and circuit using the same

A power management system coupled to a speaker module includes a monitor module for measuring a current signal and a voltage signal of the speaker module to obtain a real-time impedance information of the speaker module; a reception module for receiving a time-domain audio analogy signal to be transformed into a frequency-domain audio digital signal; a prediction module for generating a power prediction information according to an initial audio information, the real-time impedance information and the audio digital signal; a control module for generating a control signal according to the audio digital signal and a human hearing model information; and a power adjustment module for outputting an adjustment audio signal to the speaker module according to the power prediction information, the audio digital signal and the control signal, so as to perform a broadcast operation of the speaker module.

Power management system and method thereof

Growing community of inventors

Taipei County, Taiwan

Ke-Horng Chen