公开(公告)号：US11424694B2

公开(公告)日：2022-08-23

申请号：US16729254

申请日：2019-12-27

Applicant: SUNGROW POWER SUPPLY CO., LTD.

Inventor： Jiacai Zhuang ,  Jun Xu ,  Bing Zhang ,  Peng Wen ,  Peng Wang

IPC: H02M7/487 ,  H02M7/5387 ,  H02M1/36 ,  H02M1/08

Abstract: A method for controlling shutdown wave blocking of a multilevel inverter circuit and an application apparatus for applying the method are provided. After a shutdown command is issued, the multilevel inverter circuit is controlled to switch between a free state and a specific turn-on state. The free state is a state in which all switch tubes in the multilevel inverter circuit are turned off. The specific turn-on state is a state in which voltage stress withstood by a switch tube, on which clamping protection is not performed, in the multilevel inverter circuit is zero by controlling a specific combination of switch tubes in the multilevel inverter circuit to be turned on.

公开(公告)号：US11165345B2

公开(公告)日：2021-11-02

申请号：US16537056

申请日：2019-08-09

Applicant: SUNGROW POWER SUPPLY CO., LTD.

Inventor： Jiacai Zhuang ,  Jun Xu ,  Bing Zhang ,  Peng Wang ,  Peng Wen

IPC: H02M3/158 ,  H02M1/32

Abstract: A multi-level boost apparatus. Voltage allocation among N first switches is achieved by connecting N voltage dividing modules, sequentially connected in series, in parallel with the N first voltage switches, respectively. Thereby, a voltage across each of the N first switches is within a safety range. Even if an input voltage is high and a voltage across a flying capacitor is zero at an instant of being powered, it is prevented that a second one to an N-th one of the N first switches break down due to overvoltage.

公开(公告)号：US11283354B2

公开(公告)日：2022-03-22

申请号：US16538725

申请日：2019-08-12

Applicant: SUNGROW POWER SUPPLY CO., LTD.

Inventor： Jiacai Zhuang ,  Jun Xu ,  Bing Zhang ,  Peng Wang ,  Peng Wen

IPC: H02M3/158 ,  H02M1/00

Abstract: A multi-level boost apparatus. Voltage allocation among N first switches is achieved by arranging the N voltage dividing modules. It is prevented that the second one to the N-th one of the first switches break down and fail due to overvoltage. By arranging an (i−1)-th clamp branch at a common node between an (i−1)-th second switch and an i-th second switch, a voltage bore by the i-th second switch is clamped at a difference between a voltage across the fourth branch (namely, an output voltage of the multi-level boost apparatus) and a voltage across the corresponding clamp branch. The risk is avoided that a second one to the N-th one of the second switches break down due to overvoltage at an instant of being powered, in a case that the input voltage is low.