Sungrow Power Supply Co., Ltd.

Tan Shen

Peng Wang

Shangfang Dai

Bing Hu

Houlai Geng

Xiaodong Mei

Wei Zhao

Wei Bie

You Lu

A five-level inverter and its application circuit are provided. The five-level inverter is enabled to output multiple levels of voltage by controlling different conduction combinations of first, second, third, fourth, fifth, sixth, seventh, and eighth switch transistors, as well as a clamping capacitor. Two conduction combinations may be selected for outputting a positive voltage, with currents flowing through the clamping capacitor in opposite directions in the two conduction combinations. Therefore the voltage of the clamping capacitor can be balanced by controlling the two conduction combinations. Similarly, when outputting a negative voltage, the voltage of the clamping capacitor can be balanced by controlling other two conduction combinations. Therefore, a balance of power capacitor voltage can be achieved at full power and full modulation without adding an extra hardware circuit.

Five-level inverter and application circuit of the same

A central-string inverter device is provided, including a container and multiple string inverters installed in the container. The multiple string inverters are arranged in two rows located respectively on two opposite sides of the container. An intermediate duct is formed between the two rows of string inverters. An air outlet is arranged on each of side walls of the two opposite sides of the container. An air inlet is arranged on each of side walls of the other two opposite sides of the container or on a bottom wall of the container. Pulling structures corresponding to the multiple string inverters are arranged on the side walls of the two opposite sides of the container. Each string inverter is installed or removed through the pulling structure.

Central-string inverter device

Growing community of inventors

Anhui, China

Tan Shen