Huawei

This application provides a domain control-integrated motor control unit, a powertrain, and an electric vehicle. The motor control unit is configured to control operation of the electric vehicle based on signals from a plurality of sensors of the electric vehicle, and the motor control unit includes a housing and an inverter circuit and a control circuit that are accommodated in the housing. The control circuit is configured to: receive, from an accelerator pedal sensor interface on a surface of the housing through an internal line, an accelerator pedal signal from an accelerator pedal sensor, and control, based on an accelerator pedal opening indicated by the accelerator pedal signal, the inverter circuit to output an alternating current to a drive motor; and receive, from a braking pedal sensor interface on the surface of the housing through the internal line, a braking pedal signal from a braking pedal sensor, and control, based on a braking pedal opening indicated by the braking pedal signal, four wheel-end braking apparatuses to brake four wheels of the electric vehicle. This can shorten a drive control delay, and can also implement collaborative control on drive and braking, thereby helping improve handling performance of the electric vehicle.

This application relates to the field of power electronics technologies, and in particular, to a power module, a power conversion device, and a lead frame. The power module includes a substrate, an electronic element, and at least one mechanical part, the substrate includes a ceramic baseplate, and a first metal layer and a second metal layer that are disposed on two surfaces of the ceramic baseplate, both the electronic element and each mechanical part are disposed on a surface that is of the first metal layer and that is away from the ceramic baseplate, and brittleness of the mechanical part is less than brittleness of the ceramic baseplate. In a direction perpendicular to the substrate, an orthographic projection of any mechanical part on the first metal layer does not overlap with an orthographic projection of the electronic element on the first metal layer. Each mechanical part is used for being pressed against by an ejector pin of a mold in an injection molding packaging process. In an injection molding process, the power module can reduce a possibility of an undetectable micro crack generated in the ceramic baseplate under force, thereby improving product reliability, and helping improve production yield of the power module.

This application provides a photovoltaic inverter. The photovoltaic inverter includes a housing, a circuit board, and a power conversion circuit. Internal space of the housing is separated into a plurality of accommodating cavities. The plurality of accommodating cavities include a first accommodating cavity. A switch transistor of the power conversion circuit is located in the first accommodating cavity, and an electronic component is disposed between the switch transistor and a terminal panel. At least one heat dissipation fin is disposed on an outer surface that is of a housing body and that is away from a cover body. Each heat dissipation fin extends in a direction perpendicular to the terminal panel, and is disposed opposite to the switch transistor. A height of the at least one heat dissipation fin in a direction perpendicular to the outer surface is constant. After the photovoltaic inverter is mounted, the heat dissipation fin is located between the housing body and a mounting surface. Therefore, when airflow flows along the heat dissipation fin, the airflow passes through the flat outer surface of the housing body without being blocked by the housing body, thereby improving heat dissipation effect.

This application relates to the field of power electronics technologies, and in particular, to a power module, a powertrain, and an electric vehicle. The power module includes a substrate, an input, an output, a first switch component group, and a second switch component group. The substrate includes a first metal layer, a second metal layer, and a third metal layer that are isolated from each other. The first switch component group and the second switch component group are arranged in a first direction, and the third metal layer is arranged between the first switch component group and the second switch component group in the first direction. The first switch component group includes a plurality of first switch components, the second switch component group includes a plurality of second switch components, each first switch component is disposed on the first metal layer and is connected to the second metal layer, and each second switch component is disposed on the second metal layer and is connected to the third metal layer. A first input terminal is disposed on the first metal layer, a second input terminal is disposed on the third metal layer, and the output is disposed on the second metal layer. The power module can achieve both low parasitic inductance and a miniaturized design.

Embodiments of this application provide a power conversion apparatus and a power cabinet including the power conversion apparatus, and relate to the field of energy technologies. The power conversion apparatus is configured to perform power conversion on input electric energy for output. The power conversion apparatus includes an apparatus housing, a circuit board, a power device, and a substrate. The circuit board is fastened in the apparatus housing. The power device is fastened to the circuit board. The substrate is located in the apparatus housing. The substrate includes a first metal layer, a second metal layer, and a first insulation layer fastened between the first metal layer and the second metal layer. The first metal layer is connected to the circuit board or the power device. The substrate further includes a through hole and a conductor. The through hole goes through the first metal layer and the first insulation layer. The conductor penetrates the through hole and connects the first metal layer and the second metal layer. During operation of the power conversion apparatus, a voltage to ground of a part that is of the circuit board or the power device and that is configured to connect to the first metal layer remains unchanged.

Embodiments of this application disclose a photovoltaic inverter, and relate to the field of energy technologies, to resolve a problem of how to control an inverter circuit to stop operating in a timely manner to improve safety and reliability of the photovoltaic inverter when a differential-mode lightning strike occurs on the photovoltaic inverter. The photovoltaic inverter includes a controller, a direct current port, an inverter circuit, a first surge protector, three first inductors, three first capacitors, three second surge protectors, and a three-phase alternating current port. Three phases of output ends of the inverter circuit are respectively connected to first ends of the three first inductors, second ends of the three first inductors are separately connected to the three-phase alternating current port, first ends of the three first capacitors are respectively connected to the second ends of the three first inductors, and second ends of the three first capacitors are all configured to connect to a grounding end. The controller is configured to: detect a voltage of the three-phase alternating current port, and when a voltage of at least one phase of alternating current port is greater than a voltage threshold, control the inverter circuit to stop operating.

This application discloses a communication method, apparatus, and system, and pertains to the field of communication technologies. The method is performed by a first network device in a first DC. The method includes: obtaining a node identifier of a first access device in the first DC; and sending the node identifier of the first access device, first link bandwidth indication information, and first interface mapping information to a second network device in a second DC, where the first link bandwidth indication information indicates a total bandwidth of all normal links that are used to transmit traffic and that are between the first network device and the first access device, and the first interface mapping information indicates a mapping relationship between at least one network-side interface and at least one access-side interface in the first network device. In this way, when determining a first transmission link for forwarding traffic to the first access device, the second network device can ensure that a total bandwidth of the first transmission link is not greater than the total bandwidth of the normal links between the first access device and the first network device, to avoid traffic congestion in the first DC.

Embodiments of this application provide a charging terminal and a charging indication method. The charging terminal includes a top light and at least one charging connector. The top light is mounted at the top of the charging terminal, so that the top light is visible around the terminal. The top light may indicate different statuses of the charging terminal by using different light-emitting colors, including the following cases: When the charging terminal is available and has an idle charging connector, the top light is white. When the charging terminal is available but all charging connectors are occupied, the top light is blue. When the charging terminal is unavailable, the top light is red. The top light has a wide visibility range. A user may observe the top light from various angles to learn of a status of the charging terminal. In addition, a light-emitting status of the top light is simple, facilitating understanding by the user.

This application provides an alternating current-direct current conversion apparatus and a power supply device, used in the field of power electronics technologies. The alternating current-direct current conversion apparatus includes an input port, a positive direct current bus, a negative direct current bus, one or more phases of rectifier circuits, and a controller. The rectifier circuit includes a current sampling circuit, a first switching transistor bridge arm, at least one second switching transistor bridge arm, a bus capacitor, a diode bridge arm, and a surge protection device. The first switching transistor bridge arm, the second switching transistor bridge arm, the diode bridge arm, and the bus capacitor are connected in parallel between the positive direct current bus and the negative direct current bus. A bridge arm midpoint of the first switching transistor bridge arm is connected to a first terminal of the input port, a bridge arm midpoint of the second switching transistor bridge arm is connected to a second terminal of the input port, and a bridge arm midpoint of the diode bridge arm is connected to the second terminal of the input port via the surge protection device. When a current at a bridge arm midpoint of any bridge arm is excessively high, the controller turns off switching transistors on all the switching transistor bridge arms, to avoid damage to the switching transistors caused by a lightning strike.

This disclosure provides a transformer-inductor integrated device, a switching power supply, and a power supply device, and belongs to the field of power electronics technologies. The integrated device includes a magnetic core, a first conducting wire, and a second conducting wire. The magnetic core includes a bottom plate, a top plate, an inductor center post, a first side post, and a first transformer center post, where the inductor center post, the first side post, and the first transformer center post are arranged in sequence. A part of the first conducting wire is wound around the inductor center post and forms an inductor winding, and a part of the first conducting wire is wound around the first transformer center post and forms a first primary-side winding. The second conducting wire is wound around the first transformer center post and forms a first secondary-side winding. The first conducting wire is continuously wound around the inductor center post and the first transformer center post in an uninterrupted manner. In this way, the inductor winding and the first primary-side winding disclosed in this disclosure include a total of two pins, thereby reducing a quantity of pins by two compared with a discrete inductor and a discrete transformer in which an inductor winding and a first primary-side winding include a total of four pins.