Huawei Digital Power Technologies Co., Ltd.

Huawei Technologies Co., Limited

Future Wei Technologies, Inc.

Shanghai Investigation, Design & Research Institute Co., Ltd.

Bgi Shenzhen

Zhaohui Wang

Jun Wang

Lei Shi

Dianbo Fu

Jun Zhang

Dong Chen

Zhenhua Zhang

Jin Yang

Yanzhong Zhang

Wenwei Zhang

Xin Zhang

Wei Li

Xun Wang

Xudong Wang

Yuan Li

Tengyue Li

Hao Lu

Piniwan Thiwanka Bandara Wijekoon

Meihua Gong

He Zhou

Francisco Daniel Freijedo Fernández

Hui Wang

Sebastian Pedro Rosado

Shaobo Zhu

Jay Willis Shafto

Xiangwei Lu

Qing Gui

Xiaogang Song

Xiang Long

Shifeng Li

Jiacheng Chen

Fuxing Huang

Lingling Peng

Chengmei Xing

Yinling Luo

Handong Li

Aoli Wang

Xueqin Jiang

A controller controls a balancer circuit, and is configured to: determine a difference value between a first DC link voltage value across a first DC link of a power converter and a second DC link voltage value across a second DC link of the power converter; determine a phase-angle and a magnitude of the difference value for an integer harmonic of a predetermined grid frequency; and provide a switching signal for switching between the first DC link and the second DC link based on the phase-angle and the magnitude. The controller is also configured to control a mid-point current at a mid-point terminal of the power converter in terms of magnitude and direction based on the switching signal.

Controller for controlling a balancer circuit

A DC/DC power converter converts voltage at an input of the DC/DC power converter to a voltage at an output of the DC/DC power converter, where the output voltage is a multiple of the input voltage. The DC/DC power converter comprises two switching circuits electrically connected in series, two capacitors electrically connected in series, and a resonant circuit comprising a resonant capacitor and a resonant inductor. The series connection of the two capacitors is electrically connected in parallel to the series connection of the two switching circuits. The resonant circuit is electrically connected to the two switching circuits. A first capacitor of the two capacitors is electrically connected in parallel to the input. Each switching circuit comprises two switching units electrically connected in series, wherein each switching unit comprises two or more switches electrically connected in series.

DC/DC power converter, method for controlling switching thereof, DC/DC power converter arrangement and system

An offshore floating platform device, a construction method, and an operation method are provided. The device includes a pontoon carrier component. The pontoon carrier component includes a pontoon provided with a counterweight body at a bottom and a central cylinder at a top. The pontoon is provided with an anchor chain assembly on its outer cylindrical surface for keeping the elevation of the pontoon carrier component in the sea. A platform is arranged around an edge of a top surface of the central cylinder. Multiple tower bases are provided on a top surface of the central cylinder for installing a tower of the wind turbine. A buoyancy support component is provided on an outer cylindrical surface of the central cylinder, and the buoyancy support component ascends and descends as it rolls along the outer cylindrical surface of the central cylinder in response to changes in water level.

Offshore floating platform device, construction method and operation method

A DC-DC converter includes: a first capacitor, a second capacitor, a first switch device, a second switch device, a third switch device, a fourth switch device, a flying capacitor, where one end of the flying capacitor is coupled to the first intermediate node, the other end of the flying capacitor is coupled the second intermediate node; and the protective circuit, including a clamping unit and a buffering unit, where when a voltage between the positive end of the bus and the negative end of the bus increases, the clamping unit clamps the first switch device to a voltage of the first capacitor, and clamps the fourth switch device to a voltage of the second capacitor, and the buffering unit reduces a current flowing through the clamping unit and the flying capacitor.

DC-DC converter

A device includes a first switch and a first diode connected in parallel between a midpoint and a first terminal of the hybrid power device, a second switch and a second diode connected in parallel between the midpoint and a second terminal of the hybrid power device, a third switch coupled between the first terminal and the second terminal, and a third diode connected between the first terminal and the second terminal.

Hybrid power devices

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.

Control circuit, voltage source circuit, driving device, and driving method

An inverter includes an upper unit comprises a first switch, a second switch and a third switch, wherein during a first half of a cycle of the inverter, the second switch is turned on before and turned off after the third switch, a lower unit comprising a fourth switch, a fifth switch and a sixth switch, wherein during a second half of the cycle of the inverter, the fifth switch is turned on before and turned off after the sixth switch, a flying capacitor connected between the upper unit and the lower unit, and a filter connected to a common node of the upper unit and the lower unit.

Hybrid multilevel inverters with reduced voltage stress

The present disclosure provides an urban river channel direct purification device. The device includes a support wall panel arranged vertically, an upper tray and a lower tray arranged horizontally, an upper end of the support wall panel is connected with the upper tray, a lower end of the support wall panel is connected with the lower tray, the upper tray and the lower tray are respectively semi-circular, several filler biological walls are disposed between the upper tray and the lower tray, a top end of each filler biological wall is fixedly connected with the bottom of the upper tray, a bottom end of each filler biological wall is fixedly connected with the lower tray, and the filler biological wall is arranged along a radial direction of the upper tray/lower tray. The device can purify the water of the river channel through the adsorption material in the device.

Urban river channel direct purification device

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.

Conversion circuit, control method, and power supply device

A device includes a first diode and a second diode connected in series between a first terminal and a second terminal of a switching element, wherein the switching element is a unidirectional device and an anode of the first diode is directly connected to an anode of the second diode, a third diode connected between the first terminal and the second terminal of the switching element and a switch connected in parallel with the first diode.

A method comprises during a first half cycle, configuring a first switch to operate as an always-on switch, turning on a second switch prior to turning on a third switch and turning off the third switch prior to turning off the second switch, wherein the first switch and the second switch are connected in series and further in parallel with the third switch between a first terminal of a power source and a filter and during a second half cycle, configuring a fourth switch to operate as an always-on switch, turning on a fifth switch prior to turning on a sixth switch and turning off the sixth switch prior to turning off the fifth switch, wherein the fourth switch and the fifth switch are connected in series and further in parallel with the sixth switch between a second terminal of the power source and the filter.

A device comprises a first diode and a second diode connected in series between a first terminal and a second terminal of a switching element, wherein an anode of the first diode is directly connected to an anode of the second diode, a third diode connected between the first terminal and the second terminal of the switching element and a first switch connected in parallel with the first diode.

Growing community of inventors

Shanghai, China

Zhaohui Wang