Richtek Technology Corporation

Chin-Chiang Yeh

Tsung-Wei Huang

Shui-Mu Lin

Wei-Hsin Wei

Chien-Sheng Chen

Chin-Tsung Chen

Kwan-Jen Chu

Liang-Pin Tai

Chung-Lung Pai

Chun-Tsung Chen

Chean-Lung Tsay

Po-Shun Chung

A dimming method for LED driving circuit is proposed. By temporary switching a pin that is originally used for the input/output of other electric signals to a high impedance node, the dimming control signal may be inputted to dim LEDs. The dimming method comprises the steps of: floating the pin every a period of time to pull the pin's voltage being equal to the dimming control signal; detecting the pin's voltage; and retrieving the dimming control signal in accordance with the detected pin's voltage and thereafter dimming the LEDs.

Dimming method and system thereof

A direct current voltage boosting/bucking device includes a direct current voltage boosting circuit and a low drop-out (LDO) linear voltage converting circuit. The direct current voltage boosting circuit boosts an input voltage so as to generate an output voltage higher than the input voltage. The LDO linear voltage converting circuit converts the output voltage into a load voltage that is to be provided to a load, and controls the direct current voltage boosting circuit in accordance with a feedback signal from the load such that the output voltage and the load voltage have a minimum drop-out voltage differential therebetween and such that current flow through the load is maintained at a determined level.

Direct current voltage boosting/bucking device

In a three-phase inverter configured driving circuit and method, three switch assemblies are connected in parallel between an input voltage and a reference voltage and switched to generate a three-phase AC voltage on the primary side of a three-phase transformer, so as to be transformed to a three-phase current from the secondary side of the transformer to provide for three loadings.

Driving circuit configured in a three-phase inverter and driving method thereof

Growing community of inventors

Kaohsiung, Taiwan

Chin-Chiang Yeh