Richtek Technology Corporation

Yi-Min Shiu

Isaac Y Chen

Kuo-Chi Liu

Yu-Chang Chen

Chao-Chi Chen

Ta-Yung Yang

Shih-Jen Yang

Pei-Sheng Tsu

Chen-Hui Chan

Shin-Li Lin

He-Yi Shu

Yi-Shan Chu

Yu-Chieh Hsieh

Chih-Wei Chi

Chih-Ching Lee

A flyback power converter includes a power transformer, a first lossless voltage conversion circuit, a first low-dropout linear regulator and a secondary side power supply circuit. The first low-dropout linear regulator (LDO) generates a first operation voltage as power supply for being supplied to a sub-operation circuit. The secondary side power supply circuit includes a second lossless voltage conversion circuit and a second LDO. The second LDO generates a second operation voltage. The first operation voltage and the second operation voltage are shunted to a common node. When a first lossless conversion voltage is greater than a first threshold voltage, the second LDO is enabled to generate the second operation voltage to replace the first operation voltage as power supply supplied to the sub-operation circuit; wherein the second lossless conversion voltage is lower than the first lossless switching voltage.

Flyback power converter and secondary side power supply circuit and control method thereof

A multilevel buck converter includes a plurality of switches, an inductor, a flying capacitor, and a control circuit. The plurality of switches are coupled between an input terminal and a ground. The input terminal has an input voltage. The inductor is coupled between the plurality of switches and an output terminal for generating an inductor-current signal. The flying capacitor is coupled to the plurality of switches for generating a flying capacitor voltage. The control circuit is coupled to the output terminal and the plurality of switches for generating a plurality of switching signals according a feedback voltage and the inductor-current signal. The control circuit operates in a valley current mode with dual slope compensation.

Multilevel buck converter with valley current mode control and dual slope compensation

The present invention discloses a short circuit and/or bad connection detection method for use in a power supply system. The power supply system includes a power converter which converts an input voltage to an output voltage and supplies an output current to an electronic device. In the short circuit detection method, the conversion from the input voltage to the output voltage is disabled in a disable time period, and whether a short circuit occurs is determined according to the decreasing speed of the output voltage. In the bad connection detection method, an actual voltage and an actual current received by the electronic device are compared with the output voltage and the output current, to determine whether a bad connection occurs.

Power supply system and short circuit and/or bad connection detection method thereof, and power converter thereof

An abnormal connection detection method is used between a power supplier and a power receiver. The power supplier and the power receiver are connected through a cable. The cable includes positive and negative power transmission lines. The abnormal connection detection method includes: providing an output voltage from the power supplier, wherein the output voltage is lower than a predetermined voltage threshold; detecting, according to the output voltage, whether an output current generated by the power supplier is higher than a predetermined current threshold; and when the output current is higher than the predetermined current threshold, determining that an abnormal connection occurs between the power supplier and the power receiver.

Abnormal connection detection method

The present invention discloses an input/output (I/O) signal processing circuit and processing method. The I/O signal processing circuit includes a level adjustable I/O circuit and an adjustment circuit. The I/O signal processing circuit includes an output driver and/or an input comparator. The output driver transmits an output signal via a signal transmission line according to an output data. The output driver has an adjustable high operation voltage level and an adjustable low operation voltage level, which determine a high level and a low level of the output signal, respectively. The input comparator receives an input signal via the signal transmission line and comparing the input signal with an adjustable reference voltage, so as to generate an input data. The adjustment circuit generates an adjustment signal according to voltage drop related information, to correspondingly adjust the adjustable high and low operation voltage level and/or the adjustable reference voltage.

Input/output signal processing circuit and input/output signal processing method

Growing community of inventors

Hsinchu, Taiwan

Yi-Min Shiu