Huawei Digital Power Technologies Co., Ltd.

Huawei Technologies Co., Limited

Liebert Corporation

Xiaofei Zhang

Zhuyong Huang

Chuntao Zhang

Peng Shuai

Peiguo Liu

Xueli Xiao

Lei Chen

Wenjie Liu

Zhen Qin

Jiansheng Wei

Xiaoqing Hu

Zhou Shu

Kelei Liu

Zhengdong Jiang

Huiming Zhong

Jianjun Teng

Bifei Yang

Zelong Zhang

This application provides a voltage sampler and a solid-state transformer. The voltage sampler includes a conductive housing, at least one sampling board located inside the housing, and a conducting layer. Each sampling board includes at least two resistors and a voltage input end. The resistors in the sampling board are electrically connected in sequence in the direction from a first end to a second end. The resistor at the first end is electrically connected to the voltage input end. The resistor at the second end is electrically connected to the housing, and the housing is electrically connected to a fixed potential end. The conducting layer is disposed between the at least one sampling board and the housing in the voltage sampler. The conducting layer is electrically connected to a resistor in the sampling board.

Voltage sampler and solid-state transformer

A power supply and distribution system for a data center. The power supply and distribution system for a data center includes a plurality of SST power supply systems. Each of the plurality of SST power supply systems includes a rectifier module that performs voltage reduction and rectification by using an SST and an energy storage apparatus connected to the rectifier module. The plurality of SST power supply systems are in a one-to-one correspondence with a plurality of cabinet units, and each of the plurality of cabinet units is configured to deploy an SST power supply system corresponding to the cabinet unit. The rectifier module in each of the plurality of SST power supply systems receives electric energy through a medium-voltage bus.

Power supply and distribution system for data center

Embodiments of this application provide an alternating current power supply circuit, a control method for an alternating current power supply circuit. The alternating current power supply circuit includes a rectifier module and an inverter module. The rectifier module includes a first inductor, a first branch, a second branch, a third branch, a first capacitor, and a second capacitor, the third branch includes a soft switching cell, the soft switching cell includes a first switching component and a second switching component that are reversely connected in series, and the first branch, the second branch, and the third branch form an I-type three-level topology or a T-type three-level topology. The inverter module includes a second inductor, a fourth branch, a fifth branch, a sixth branch, the first capacitor, and the second capacitor, the sixth branch includes the soft switching cell, and the fourth branch, the fifth branch.

Alternating current power supply circuit, control method thereof, and alternating current power supply with an efficient soft switching circuit

A power conversion system includes a first controller, a system output end, at least one system input end, at least one power conversion component, and a bus communication apparatus coupled between each power conversion component and the first controller. Each system input end is in a one-to-one correspondence with each power conversion component. Each power conversion component is configured to convert an alternating current input through a first input end of each power conversion component into a direct current, and output the direct current through an output end of each power conversion component.

Power conversion system, power conversion module, and processing apparatus

This application discloses a power electronic transformer wherein each phase includes a plurality of power conversion modules. Each power conversion module includes a rectifier AC/DC circuit, a direct current bus capacitor, and a direct current-direct current DC/DC circuit. In each power conversion module, an output end of the AC/DC circuit is connected to an input end of the DC/DC circuit; the direct current bus capacitor is connected in parallel to the output end of the AC/DC circuit; and input ends of all the AC/DC circuits are connected in series, and output ends of all the DC/DC circuits are connected in parallel. The power electronic transformer includes a relatively small quantity of power conversion modules, thereby reducing occupied space and costs.

Power electronic transformer and power supply system

Embodiments of this application disclose a power supply apparatus, a power supply system, and a data center designed to reduce the number of power conversion steps, equipment costs, and circuit loss. The power supply apparatus includes: a solid-state transformer configured to convert an alternating current into a first direct current; a first direct current/direct current converter, coupled to the solid-state transformer and configured to convert the first direct current into a second direct current; an energy storage component, coupled to the first direct current/direct current converter and configured to perform energy storage on the second direct current; and a second direct current/direct current converter, coupled to the first direct current/direct current converter and configured to convert the second direct current into a third direct current, where the third direct current is used to supply power to a load.

Power supply apparatus, power supply system, and data center

A power system, related to the field of electronic power. The power system includes a centralized controller and three power modules. Each phase of an alternating current power supply is connected to one power module, and an input end of each power module is connected to one phase of the alternating current power supply. Each power module includes a low voltage controller and at least two power units. Each power unit includes a unit controller. The centralized controller is connected to each low voltage controller by using a bus. The centralized controller sends a control signal to each unit controller by using each low voltage controller, to control the unit controller and/or a power conversion circuit. The power system can implement hot swap of the power module and improve on-site operation reliability.

Power system, data center, and charging device

This application provides a power supply method for a data center. The data center includes a first device and at least one second device, an importance of a first service in the first device is higher than an importance of a second service in the at least one second device, and the second service in the at least one second device is transferable. A power supply apparatus includes a first uninterruptible power supply UPS and a second UPS, the first UPS is configured to control a first power source and a first energy storage apparatus to supply power to the first device, and the second UPS is configured to control the first power source and a second energy storage apparatus to supply power to the at least one second device.

Control method and control apparatus for power supply apparatus in data center

Embodiments of this application provide a power conversion circuit. The power conversion circuit includes at least one first power conversion unit connected in series to a first phase line, at least one second power conversion unit connected in series to a second phase line, at least one third power conversion unit connected in series to a third phase line, a plurality of first start circuits connected in series to the first phase line, and a plurality of second start circuits connected in series to the second phase line. Each first start circuit includes a first relay and a first resistor that are connected in parallel, and first relays in all the first start circuits are sequentially closed after the power conversion circuit is powered on, to start the power conversion circuit. Each second start circuit includes a second relay and a second resistor that are connected in parallel.

Power conversion circuit, method for controlling power conversion circuit, and transformer

A control method for performing a multi-table join operation and a corresponding apparatus are disclosed. Fields in a table whose fields participating in a theta join operation and used in the query statement meet a first preset condition are decomposed, to obtain a plurality of first field groups, so that the theta join operation can be implemented in steps in a form of the plurality of field groups. This can reduce a data amount of Cartesian product calculation during one join operation, greatly reduce network transmission overheads, computing overheads, and memory overheads, and improve execution efficiency.

Control method for performing multi-table join operation and corresponding apparatus

A multi-level circuit, a three-phase multi-level circuit, and a control method are provided. The multi-level circuit includes two groups of bus capacitors (Cand C) that are connected in series; a plurality of switching transistor branches that are connected in parallel to the capacitors, where each switching transistor branch includes a first half bridge (Qand Q) and a second half bridge (Qand Q), and a common terminal of the two half bridges is grounded (N); and two negative coupled inductors (Land L), where each input terminal of each negative coupled inductor is connected to a common terminal (Aand A) of two switching transistors in the first half bridge in only one of the switching transistor branches. In this circuit, a quantity of groups of bus capacitors is decreased and circuit design complexity is reduced. Further, a dropout voltage of the switching transistors is reduced.

Multi-level circuit, three-phase multi-level circuit, and control method

A power supply control apparatus, where the power supply control apparatus is configured to control power supply to a cabinet in a data center is presented, where the power supply control apparatus includes a communications module configured to receive an instruction of a network management center, and a controllable switch configured to adjust a capacity of the controllable switch according to the instruction to perform power-on/power-off control on the cabinet. In various embodiments, a power supply control apparatus may receive an instruction of a network management center, and can adjust a capacity of a controllable switch according to the instruction, which enhances power distribution flexibility, and therefore, a workload of changing a switch and a power cable can be reduced, and an engineering related risk can be avoided.

Power supply control apparatus and method for controlling power supply

The present invention discloses a control method for a soft switch circuit in a switch power source, which generates an alternating primary power filter current by controlling first and second primary power switching devices to be closed and opened, and generates an intermittent alternating resonant current in the same direction as the primary power filter current in a resonant branch by controlling forward and backward auxiliary switching devices to be closed and opened to thereby achieve closing of the first and second primary power switching devices at a zero voltage, and which generates a balance current with the same magnitude as and in the opposite direction to the resonant current in the resonant branch in at least a period of time during the resting of the resonant current by further controlling the forward and backward auxiliary switching devices to be closed and opened to thereby achieve an average current of zero across the resonant branch in a switching cycle. Without any additional balance circuit, this control method can address the imbalance problem of output power of the positive and negative direct current input voltage sources in a soft switch circuit of an existing switch power source.

Control method for soft switch circuit in switch power source

The present invention relates to a control method for a soft switch circuit in a switch power supply, which controls first and second main power switch devices to be turned on and turned off constantly to generate an alternating main power filter current, and controls forward and backward auxiliary switch devices to be turned on and turned off to generate an intermittent alternating resonant current across a resonant branch in the same direction as the main power filter current to thereby achieve zero-voltage turn-on of the first and second main power switch devices; and further controls the forward and backward auxiliary switch devices to be turned on and turned off to generate compensation currents across the resonant branch in the opposite direction to the alternating main power filter current in at least a period of time during resting of the resonant current to thereby accomplish a charging and discharging process of resonant capacitors in a dead time. Thus, a freewheeling diode can be turned on normally, so that it is possible to avoid a damage to the devices due to an impact current and a spark voltage resulting at zero crossing of the current in the soft switch circuit.

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Shenzhen, China

Xiaofei Zhang