公开(公告)号：US20240396472A1

公开(公告)日：2024-11-28

申请号：US18797720

申请日：2024-08-08

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Shen GAO ,  Fenglong LU ,  Shuai LIU ,  Lei SHI

IPC: H02M7/5387 ,  H02M7/487

Abstract: An inverter includes an inverter circuit, a collection circuit, a balanced circuit, and an inductor. The collection circuit is configured to detect a direct current bus voltage, to obtain end voltage values of a first capacitor and a second capacitor. The balanced circuit is configured to: when an end voltage value of a target capacitor is less than or equal to a first voltage threshold, control on or off of a plurality of switching transistors, to adjust a current for charging the target capacitor through the inductor and reduce a difference between the end voltage values of the target capacitor and a non-target capacitor in the two groups of capacitors. When the difference between the end voltage values of the two groups of capacitors in the inverter circuit is large, the balanced circuit may adjust an output current of the inductor to charge the target capacitor.

公开(公告)号：US20240333135A1

公开(公告)日：2024-10-03

申请号：US18617721

申请日：2024-03-27

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Fenglong LU ,  Shuai LIU ,  Dong CHEN ,  Lei SHI

IPC: H02M1/12 ,  H02M7/539

CPC classification number: H02M1/126 ,  H02M7/539

Abstract: An inverter apparatus and a control method thereof. The inverter apparatus includes a direct current bus, a bus capacitor, an inverter bridge arm, a filter circuit, a switch unit, and a controller. The inverter bridge arm is connected to a positive direct current bus and a negative direct current bus, and the filter circuit is connected between the inverter bridge arm and a user load. In a working scenario in which the inverter apparatus switches between on-grid operation and off-grid operation, when the working scenario is on-grid operation and off-grid operation with a balanced load, an inverter uses a common-mode injection modulation mode; and when the working scenario is off-grid operation with an unbalanced, the inverter uses a common SPWM modulation mode. The embodiments are implemented to improve working efficiency of the inverter in more working scenarios, and the implementation is simple, stable, reliable, and load-friendly.