公开(公告)号：US10084392B2

公开(公告)日：2018-09-25

申请号：US15272857

申请日：2016-09-22

Applicant: Sungrow Power Supply Co., Ltd.

Inventor： Tan Shen ,  Peng Wang ,  Houlai Geng ,  Bing Hu ,  Wei Bie ,  Shangfang Dai

IPC: H02M7/487 ,  H02M7/537 ,  H02M1/12 ,  H02M1/44

CPC classification number: H02M7/537 ,  H02M1/12 ,  H02M1/44 ,  H02M7/487

Abstract: 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.

公开(公告)号：US10038391B2

公开(公告)日：2018-07-31

申请号：US15630118

申请日：2017-06-22

Applicant: SUNGROW POWER SUPPLY CO., LTD.

Inventor： Wei Zhao ,  You Lu ,  Tan Shen ,  Xiaodong Mei

IPC: H05K7/20 ,  H02M7/00 ,  H05K7/14 ,  H02J1/10 ,  H02M7/42

CPC classification number: H02M7/003 ,  H02J1/102 ,  H02M7/42 ,  H05K7/1427 ,  H05K7/20009 ,  H05K7/2059 ,  H05K7/20909

Abstract: 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.