公开(公告)号：US20210384731A1

公开(公告)日：2021-12-09

申请号：US17405465

申请日：2021-08-18

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Xiaofeng YAO

IPC: H02J3/38 ,  H02M1/36 ,  H02M7/48 ,  H02S40/32

Abstract: A power conversion apparatus and a method for controlling an output impedance of a power conversion apparatus are provided to resolve a prior-art problem of relatively low accuracy of a method for determining a working status of a power conversion apparatus. The method includes: adjusting the output impedance of the power conversion apparatus to a first impedance when the power conversion apparatus does not satisfy a start condition; or adjusting the output impedance of the power conversion apparatus to a second impedance when the power conversion apparatus satisfies a start condition, where the first impedance is not equal to the second impedance.

公开(公告)号：US20140132230A1

公开(公告)日：2014-05-15

申请号：US14136794

申请日：2013-12-20

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Yang CHENG ,  Weifeng WANG ,  Xiaofeng YAO

IPC: H02M1/42

CPC classification number: H02M1/4216 ,  H02M1/4208 ,  H02M1/4225 ,  Y02B70/126

Abstract: Embodiments of the present application provide a power factor correction circuit and a power supply circuit. The power factor correction circuit includes a main correction circuit and a switch module. The main correction circuit includes: a first correction circuit and a second correction circuit that are configured to perform power factor correction on an forward alternating current voltage, and a third correction circuit and a fourth correction circuit that are configured to perform power factor correction on an inverse alternating current voltage. The switch module includes first switch units that are connected in parallel between an input terminal of the first correction circuit and an input terminal of the third correction circuit, and second switch units that are connected in parallel between an input terminal of the second correction circuit and an input terminal of the fourth correction circuit.

Abstract translation: 本申请的实施例提供功率因数校正电路和电源电路。 功率因数校正电路包括主校正电路和开关模块。 主校正电路包括：第一校正电路和第二校正电路，被配置为对正向交流电压进行功率因数校正;以及第三校正电路和第四校正电路，被配置为在 反向交流电压。 开关模块包括并联连接在第一校正电路的输入端和第三校正电路的输入端之间的第一开关单元和在第二校正电路的输入端和 第四校正电路的输入端。

公开(公告)号：US20210351592A1

公开(公告)日：2021-11-11

申请号：US17382607

申请日：2021-07-22

Applicant: HUAWEI TECHNOLOGIES CO., LTD.

Inventor： Guilei GU ,  Xiaofeng YAO

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

Abstract: A converter includes a controller and at least one switching transistor. The converter supports access of at least two photovoltaic units, the at least two photovoltaic units are connected in series inside the converter by using the switching transistor, and the photovoltaic unit is formed by at least one photovoltaic component connected in series and in parallel. The controller is configured to: when a shutdown instruction is received or a heartbeat instruction is lost within a preset time period, control the switching transistor to be disconnected, so that any two photovoltaic units connected in series are disconnected. According to the converter provided in this application, any two photovoltaic units connected in series can be disconnected when the photovoltaic power generation system is shut down. In this way, no dangerous high voltage exists in a photovoltaic array formed by the photovoltaic units, thereby improving safety of the photovoltaic power generation system.