公开(公告)号：US20220029555A1

公开(公告)日：2022-01-27

申请号：US17495117

申请日：2021-10-06

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zhaohui WANG ,  Lei SHI ,  Dong CHEN

IPC: H02M7/5387 ,  H02J3/38 ,  H02M1/14 ,  H02M1/12

Abstract: A power conversion circuit includes a switching network, a control circuit, a filter circuit, and a direct current side circuit; and the filter circuit includes a first power inductor, a common mode choke, a first differential mode filter capacitor, a first common mode filter capacitor, and a second common mode filter capacitor. The first power inductor includes a first winding and a second winding, and the common mode choke includes a third winding and a fourth winding; a first end of the first winding and a first end of the second winding are separately connected to the switching network, a second end of the first winding and a second end of the second winding are respectively connected to a first end of the third winding and a first end of the fourth winding.

公开(公告)号：US20210376790A1

公开(公告)日：2021-12-02

申请号：US17404407

申请日：2021-08-17

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Dong CHEN ,  Lei SHI ,  Zhaohui WANG

IPC: H02S50/10 ,  H02S40/32

Abstract: A photovoltaic power generation system includes a plurality of photovoltaic modules, a plurality of optimizers, and an inverter. Each optimizer is connected to at least one photovoltaic module, and output ends of the plurality of optimizers are connected in series to form a string and then connected to the inverter. The optimizer includes a conversion unit, and a control unit configured to control the conversion unit. The optimizer further includes an auxiliary power source, an energy storage unit, and a first unidirectional conduction unit that are connected between the conversion unit and the control unit. The control unit is configured to perform IV curve scanning for each voltage segment, where the voltage segments are obtained by segmenting a range of an output voltage of a photovoltaic module corresponding to the optimizer from an open-circuit voltage to a preset minimum voltage, and at least two voltage segments are obtained through division.

公开(公告)号：US20220029522A1

公开(公告)日：2022-01-27

申请号：US17495112

申请日：2021-10-06

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Dong CHEN ,  Lei SHI ,  Zhaohui WANG

IPC: H02M1/00 ,  H02M1/08 ,  H03K17/16

Abstract: A control circuit includes a detection module configured to detect an operating condition of a semiconductor switching device; a determining module configured to determine a gate allowable voltage of the semiconductor switching device based on the operating condition; and an output module configured to output a control signal to a driving power supply circuit of the semiconductor switching device based on the gate allowable voltage, to control the driving power supply circuit to provide a gate on voltage that is not higher than the gate allowable voltage and that is positively correlated with the gate allowable voltage for the semiconductor switching device. When the operating condition of the semiconductor switching device becomes better, the gate allowable voltage of the semiconductor switching device is increased.

公开(公告)号：US20200177100A1

公开(公告)日：2020-06-04

申请号：US16785225

申请日：2020-02-07

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Zhaohui WANG ,  Lei SHI ,  Dianbo FU

IPC: H02M7/487 ,  H02M7/5387 ,  H02J3/38 ,  H02M1/08 ,  H02M1/00 ,  H02J9/06 ,  H02M7/483

Abstract: A conversion circuit is disclosed. In the conversion circuit, an input terminal includes a positive direct current bus terminal and a negative direct current bus terminal, and an output terminal includes an alternating current output end; a first switch unit includes a flying clamping capacitor and a first converter bridge arm; a second switch unit includes a second converter bridge arm; an output end of the first switch unit and the second switch unit is connected to the alternating current output end; and the first switch unit and the second switch unit are connected to a control module, and switch under control of the control module, so that the conversion circuit converts between a direct current voltage and an alternating current voltage, to output a required alternating current voltage.