公开(公告)号：US11705735B2

公开(公告)日：2023-07-18

申请号：US17711388

申请日：2022-04-01

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Wei Liu ,  Zhiwu Xu

IPC: H02J3/38 ,  H02S40/32 ,  H02J3/46

CPC classification number: H02J3/381 ,  H02J3/46 ,  H02S40/32 ,  H02J2300/26

Abstract: A photovoltaic system includes a controller and plurality of photovoltaic strings that are independently controlled. The controller enables some photovoltaic strings to be in a maximum power point tracking state, and the remaining photovoltaic strings to be in a power output limited state. The system implements maximum power point tracking detection so that the maximum power point power and the maximum power point voltage are updated in real time. Further, the working status of the power supply system can be fed back in real time, so that the photovoltaic system can predict the capacity of an energy storage apparatus or regulate charging and discharging of the energy storage apparatus. After a curtailment state ends, the photovoltaic system is relatively quickly restored to the normal working state, so that a loss of generated power is reduced.

公开(公告)号：US11632055B2

公开(公告)日：2023-04-18

申请号：US17359135

申请日：2021-06-25

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Qinglei Wang ,  Qinghui Hou ,  Chenghao Sun ,  Wei Liu

IPC: H02M3/335 ,  H02M1/00

Abstract: An Active Clamp Flyback (ACF) converter includes a transformer module, a clamping module, and a controller. The controller is configured to: after the transformer module starts secondary side discharging, control the clamping module to start receiving leakage inductance power from the transformer module; and after controlling the clamping module to stop receiving the leakage inductance power from the transformer module, control the clamping module to release the leakage inductance power to the transformer module. The leakage inductance power released by the clamping module to the transformer module is used by the transformer module to restore a soft switching state based on the leakage inductance power. In a process of transferring the leakage inductance power to a clamping capacitor, the clamping module is in an enabled state. This reduces a loss caused by the clamping module to the leakage inductance power, and helps reduce overall loss caused by the ACF converter.

公开(公告)号：US20220263144A1

公开(公告)日：2022-08-18

申请号：US17738679

申请日：2022-05-06

Applicant: Huawei Digital Power Technologies Co., Ltd.

Inventor： Jie Xie ,  Guanghui Zhang ,  Wei Liu

IPC: H01M10/44 ,  H01M10/48 ,  H01M10/657 ,  H01M10/615 ,  H01M10/625 ,  H01M10/633

Abstract: A battery heating system includes: a temperature monitoring circuit configured to output a temperature monitoring signal; a voltage conversion circuit configured to receive a first voltage that is input by a power supply or a second voltage that is input by a to-be-heated battery; and a control circuit configured to receive the temperature monitoring signal and output a control signal. The voltage conversion circuit is configured to perform boosting processing or bucking processing on the first voltage based on the control signal or perform boosting processing or bucking processing on the second voltage based on the control signal to enable the to-be-heated battery to receive a charging current from the power supply in a first time segment using the voltage conversion circuit and the to-be-heated battery to output a discharging current to the power supply in a second time segment using the voltage conversion circuit.