Wanbang Digital Energy Co., Ltd.

Wanbang Star Charge Technology Ltd.

Guochuang Innovation Center of Mobile Energy (jiangsu) Co., Ltd.

Hsien-Yi Tsai

Yutan Zhang

Guoce Li

Fei Du

Daquan Xie

Wendi Song

Rupei Zhang

Yangyang Qian

A three-phase single-stage isolated bidirectional converter and a method of controlling same are provided. The bidirectional converter includes a three-phase AC voltage port, a DC voltage port, full-bridge circuit units, half-bridge circuit units, phase-shift inductor units, transformers, and filter capacitors. The first full-bridge circuit unit is connected to the first half-bridge circuit unit. The third full-bridge circuit unit is connected to the second half-bridge circuit unit. The fifth full-bridge circuit unit is connected to the third half-bridge circuit unit. The first half-bridge circuit unit is connected to the first filter capacitor. A midpoint of a bridge arm of the first half-bridge circuit unit is connected to a second port. A midpoint of a bridge arm of the second half-bridge circuit unit is connected to a fourth port. A midpoint of a bridge arm of the third half-bridge circuit unit is connected to a sixth port.

Three-phase single-stage isolated bidirectional converter and controlling method

The present disclosure provides a method and system for ground fault detection. The method may include obtaining an input voltage and a null-ground voltage; determining whether the null-ground voltage is less than a voltage threshold; if yes, further determining whether the null-ground voltage is less than a preset voltage; if yes, determining that the grounding state is normal; if the null-ground voltage is greater than or equal to the preset voltage, determining that the grounding state is abnormal; if the null-ground voltage is greater than or equal to the voltage threshold, determining that the live wire and the null wire are reversed; in the case that the live wire and the null wire are reversed, determining whether the difference between the input voltage and the null-ground voltage is less than the preset voltage; if yes, determining that the grounding state is normal; if no, determining that the grounding state is abnormal.

Ground fault detection method and system

Growing community of inventors

Jiangsu, China

Hsien-Yi Tsai