Tsinghua University

Acbel Polytech Inc.

Yi Chang

Da-Jeng Yao

Wei-Hua Chieng

Ching-Yao Liu

Li-Chuan Tang

Chih-Chiang Wu

Yueh-Tsung Shieh

A D-mode GaN transistor synchronous rectifier of the present invention includes a power switching module, a peak detection module, and a gate driver module. The peak detection module stores energy when the negative end of the secondary side winding of the power converter is at a high voltage. The power switching module includes a first switch and a D-mode GaN HEMT as a second switch connected in series. The energy is provided to the module gate of the power switching module through the gate driver module to keep the first switch turned on. The gate driver module conducts the module gate and the module source when the positive end of the secondary side winding is at a low voltage, such that a clamp circuit pulls the gate-source voltage of the second switch below threshold and turns it off. The synchronous rectifier replaces conventional diode rectifier, having lower conduction loss and response ringing.

D-mode GaN transistor synchronous rectifier and power converter having the synchronous rectifier

Growing community of inventors

Hsinchu, Taiwan

Yi Chang