公开(公告)号：US20250030356A1

公开(公告)日：2025-01-23

申请号：US18715066

申请日：2022-12-30

Applicant: Sungrow Power Supply Co., Ltd.

Inventor： Qiaodi Chen ,  Jiacai Zhuang ,  Jun Xu

IPC: H02M7/5387 ,  H02M1/00 ,  H02M1/32

Abstract: Provided in the present application is a micro inverter. In a main circuit of the micro inverter, after N conversion branches are cascaded with each other, the same transformer is shared to connect a secondary-side bridge arm, thereby avoiding the need for N transformers in the prior art; moreover, by means of cascading, the N conversion branches can realize decoupling in terms of control, thereby avoiding the need to additionally equip each branch with a device for decoupling, and thus reducing the volume and costs. In addition, each direct-current source or load can realize alternating-current grid connection only by means of one-stage conversion, and therefore, the conversion efficiency is improved compared with a two-stage conversion structure in the prior art.

公开(公告)号：US12143032B2

公开(公告)日：2024-11-12

申请号：US17636161

申请日：2020-05-25

Applicant: Sungrow Power Supply Co., Ltd.

Inventor： Wei Liu ,  Jiacai Zhuang ,  Jun Xu

IPC: H02M7/483 ,  H02M1/00 ,  H02M1/32 ,  H02M7/487

Abstract: A flying capacitor-type NPC three-level topology, comprising: two half-busbar capacitors and at least one bridge arm. The bridge arm comprises: a flying capacitor, two inner transistor units, two outer transistor units, and two clamping diodes, wherein the capacitance of the flying capacitor is greater than a specific value. Since the flying capacitor has a clamping effect on the two inner transistor units and the capacitance of the flying capacitor is large, voltage fluctuations of the flying capacitor would not cause overvoltage of switching transistors no matter what type of short circuit fault occurs, thereby preventing the switching transistor units from being damaged due to overvoltage and further improving the security of a circuit.

公开(公告)号：US12113356B2

公开(公告)日：2024-10-08

申请号：US17703742

申请日：2022-03-24

Applicant: Sungrow Power Supply Co., Ltd.

Inventor： Jiacai Zhuang ,  Wei Liu ,  Jun Xu

IPC: H02J1/00 ,  H02J1/10 ,  H02J1/12 ,  H02S40/30

CPC classification number: H02J1/106 ,  H02J1/12 ,  H02S40/30 ,  H02J2300/24

Abstract: A photovoltaic power generation system and a method for controlling power balance are provided. The system includes at least two photovoltaic arrays, at least one power balance circuit and a power converter. Each of input ports of the power balance circuit is connected with at least one photovoltaic array, and an output port of the power balance circuit is connected with the power converter. The power balance circuit performs power transfer based on a difference between output powers of the two photovoltaic arrays to control a difference between powers of two output terminals of the power balance circuit to be within a preset range.

公开(公告)号：US20240313639A1

公开(公告)日：2024-09-19

申请号：US18576332

申请日：2022-06-10

Applicant: Sungrow Power Supply Co., Ltd.

Inventor： Yuan Zhuang ,  Yuquing Cui ,  Fushuai Zhuang ,  Jiacai Zhuang ,  Jun Xu

IPC: H02M1/32 ,  H02J3/38 ,  H02M7/48

CPC classification number: H02M1/327 ,  H02J3/38 ,  H02M7/48

Abstract: An energy conversion system, and a method and a device for controlling the energy conversion system at an overtemperature are provided. The energy conversion system includes at least one power conversion circuit each including at least two power modules that are cascaded. Respective operating temperatures of all the power modules are measured in real time, to determine the overheated power module that is operating at an overtemperature and the underheated power module that is operating at a normal temperature. Once an overheated power module is detected, a decreased power and a power difference for the overheated power module are acquired, and an increased power for the underheated power module is determined based on the power difference. The operating power of the overheated power module is decreased at the module level with the total operating power of the system remains constant or approximately constant.

公开(公告)号：US12095350B2

公开(公告)日：2024-09-17

申请号：US18010435

申请日：2021-05-21

Applicant: Sungrow Power Supply Co., Ltd.

Inventor： Yue Dong ,  Jiacai Zhuang ,  Jun Xu

IPC: H02M1/00 ,  H02M1/08 ,  H02M3/335 ,  H02M7/217 ,  H02M7/483 ,  H02M7/49

CPC classification number: H02M1/007 ,  H02M1/0074 ,  H02M1/081 ,  H02M3/33576 ,  H02M7/217 ,  H02M7/483 ,  H02M7/49

Abstract: A cascaded power electronic transformer and a method for controlling the same are provided. The method includes: calculating electrical angles θi1 and θkps of an sth transformer and a compensation electrical angle θj of a jth transformer; adding the compensation electrical angle θj to the electrical angle θkps of the jth transformer, to obtain a compensated electrical angle θkps of the jth transformer; and calculating a square wave of a bridge arm voltage of each of the m primary converters and the r secondary converters of the sth transformer based on the electrical angle θi1 and the electrical angle θkps of the sth transformer after compensation.

公开(公告)号：US12021456B2

公开(公告)日：2024-06-25

申请号：US17694767

申请日：2022-03-15

Applicant: Sungrow Power Supply Co., Ltd.

Inventor： Jiacai Zhuang ,  Jun Xu ,  Hanyu Wang

IPC: H02M3/335 ,  H02M1/00 ,  H02M3/00

CPC classification number: H02M3/33584 ,  H02M1/0009 ,  H02M3/01 ,  H02M3/33573

Abstract: An isolated bidirectional converter and a method for controlling the same are provided. A primary winding or a secondary winding of a transformer module in the isolated bidirectional converter is connected in parallel with a first branch includes a first inductor and a first current sensor that are connected in series. A current flowing through the first inductor is acquired by the first current sensor, and is proportional to a current flowing through a magnetizing inductor of the winding. Therefore, the current is controlled by modifying a duty cycle of a switch transistor on a bridge arm in the circuit, so that a direct current component of a current flowing through the winding is modified indirectly, thereby avoiding magnetic bias on the magnetizing inductor of the transformer module, and preventing the transformer module from being saturated.

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.