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：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：US09906166B2

公开(公告)日：2018-02-27

申请号：US15581723

申请日：2017-04-28

Applicant: SUNGROW POWER SUPPLY CO., LTD.

Inventor： Jun Xu ,  Jinhu Cao ,  Peng Chen ,  Peng Wang

IPC: H02M7/537 ,  H02M7/487 ,  H02J3/38

CPC classification number: H02M7/537 ,  H02J3/385 ,  H02M7/487 ,  Y02E10/56

Abstract: Provided are a method and a device for controlling an operation of an inverter. The method includes: determining whether a direct current side voltage of the inverter is greater than an operation voltage setting threshold; and if no, controlling the inverter to operate according to a five level control strategy; and if yes: adjusting the direct current side voltage by using a maximum power tracking algorithm; adjusting linearly a floating capacitor voltage of the inverter based on the adjusted direct current side voltage; determining whether the adjusted floating capacitor voltage is in a preset range; and if yes, controlling the inverter to operate according to a five level control strategy; and if no, controlling the inverter to operate according to a seven level control strategy.

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：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.