Alpha & Omega Semiconductor Corporation

Huawei Digital Power Technologies Co., Ltd.

Huawei Technologies Co., Limited

Future Wei Technologies, Inc.

Taiwan Semiconductor Manufacturing Comp. Ltd.

Firmenich Sa

Schneider Electric Industries Sas

Shanghai Jiaotong University

Baoshan Iron & Steel Co., Ltd.

Koninklijke Philips Corporation N.v.

Emc IP Holding Company LLC

Chinese Academy of Sciences

Rutgers, the State University of New Jersey

Princeton University

Micro Focus Lcc

Lei Shi

Jun Lu

Yueh-Se Ho

Yan Xun Xue

Kai Chieh Liu

Dianbo Fu

Dong Chen

Ping Huang

Liang Zhao

Ming Sun

Zhaohui Wang

Yuping Gong

Hamza Yilmaz

Yunfeng Liu

Yongbing Gao

Fei Ye

Jun Wang

Fei Xu

Anup Bhalla

Jun Zhang

Feng Han

Yanzhong Zhang

Lahoussine Ouali

Liang-Yu Su

Hung-Chih Tsai

Hang Fan

Lei Duan

Tao Li

François Hébert

Zhiqiang Niu

Tao Feng

Ming Lei

Jianrui Han

Anke Kretz-Rommel

Hua Pan

Ying Shi

Lei Han

Zhangji Zhou

Shuang Sun

Bing Shuang

Haijun Zhao

Yanshen Hu

Haomin Jiang

Ruisheng Wu

Roger Ferrini

Hem P Takiar

Wei Zhang

Christian Klein

Johannes Petrus Maria Ansems

Ekkehard Moessner

Jing Li

Pablo Umana

Jie Cui

Chin-Tien Chiu

Peng Wang

Robert K Prud'homme

Hui Li

Anjian Li

Wei Jun Zhang

Jia Tao Li

Ralf Hosse

Kai Xin

Christoph Gerard August Hoelen

Xiaotian Zhang

Rene Theodorus Wegh

Zhen Cao

Howard A Stone

Zhipeng Wu

Fajun Nan

Xinyu Yu

Patrick J Sinko

Juergen Michael Schanzer

Ping Wu

Fangcheng Liu

Guilei Gu

Ting Liu

Li Yi Feng

Xiaoqing Duan

Jingya Li

Zheng Ma

Qin Zhou

Wuhua Li

Shineng Ma

Binbin Zheng

Ye Bai

Chenxi Zhang

Yong Fang Shi

Nicolas Pichon

Haohan Zhang

Jiamin Chen

Feng Yan

Fei Zheng

He Zhou

Yangsheng Qiu

Chen Zhao

Katharina Wartha

Shijiang Yu

Fabien Dechamps

Wenhua Wang

A three-level neutral point clamped inverter includes four switch units. When an average value of an output current of the three-level neutral point clamped inverter is greater than a first current threshold or less than a second current threshold, only one of the four switch units is controlled to perform a high-frequency operation, to reduce power consumption caused by a high-frequency operation. The average value of the output current is an average value of the output current of the three-level neutral point clamped inverter in a switching cycle. The first current threshold is a positive number, and the second current threshold is a negative number. Power consumption caused by the high-frequency operation of the switch unit in the inverter may be reduced, and electric energy conversion efficiency of the inverter may be improved. A time period in which two switch units perform complementary operations at high frequency is very small.

Photovoltaic system, inverter, and control method

A backfeed soft-start circuit for a photovoltaic inverter is provided. The backfeed soft-start circuit includes a plurality of branch switches. A solar photovoltaic array includes a plurality of photovoltaic modules, where the plurality of branch switches are in a one-to-one correspondence with the plurality of photovoltaic modules, and when the plurality of branch switches are turned on, the corresponding photovoltaic modules are connected to the backfeed soft-start circuit; and a primary switching switch. The branch switches is connected to a corresponding photovoltaic module, and the primary switching switch. The primary switching switch is turned on after the branch switch is turned on.

Backfeed soft-start circuit for string photovoltaic inverter

A packaged power semiconductor device includes a power semiconductor wafer, a heat conduction layer, and a heat sink that are sequentially stacked, and a sealing part configured to wrap and seal the power semiconductor wafer and at least part of the heat conduction layer. The packaged power semiconductor device further includes a pin, where the pin includes a connection segment wrapped inside the sealing part, and an extension segment located outside the sealing part. The connection segment is electrically connected to the power semiconductor wafer, and a shortest distance between the extension segment and a first outer surface is greater than a creepage distance corresponding to a highest working voltage of the power semiconductor wafer. This can avoid a creepage phenomenon of the pin by limiting a distance between the first outer surface and the extension segment that is of the pin and that is exposed outside the sealing part.

Packaged power semiconductor device and power converter

This disclosure provides an energy storage apparatus, an energy storage apparatus control method, and a photovoltaic system. The energy storage apparatus includes: a plurality of battery clusters, a plurality of conversion units, a start unit, and a controller. The controller includes a plurality of control units. The start unit is configured to: after receiving a start signal, control a control switch in at least one battery cluster to close, to start a control unit corresponding to the battery cluster. The control unit is configured to: determine, based on a state of the control switch in the battery cluster, whether a black start mode is on; and when determining that the black start mode is on, control a DC-DC converter in the corresponding conversion unit to release electric energy stored in a battery pack in the corresponding battery cluster, to energize a direct current bus.

Energy storage apparatus, energy storage apparatus control method, and photovoltaic system

A bidirectional direct current converter includes a controller that controls a switching transistor in the bidirectional direct current converter to reduce an inductance of an inductor, thereby reducing a size and costs of the inductor, and further reducing a size and costs of the entire bidirectional direct current converter. The bidirectional direct current converter further includes a first switching transistor, a second switching transistor, a third switching transistor, a fourth switching transistor, and a capacitor. The controller is coupled to the first switching transistor, the second switching transistor, the third switching transistor, and the fourth switching transistor. The controller performs complementary control on the first switching transistor and the third switching transistor, and performs complementary control on the second switching transistor and the fourth switching transistor.

Bidirectional direct current converter and control method thereof

A semiconductor device includes a doped region of a first conductivity type in a substrate, a source/drain region of the first conductivity in the doped region, and a gate structure overlapping a portion of the doped region. The semiconductor device further comprises a multi-layer spacer over a first sidewall of the gate structure. The multi-layer spacer comprises a first spacer layer, a second spacer layer over the first spacer layer, and a third spacer layer over the second spacer layer. The first spacer layer and the second spacer layer are in contact with the first sidewall of the gate structure.

Semiconductor device and manufacturing method thereof

Embodiments of this application disclose an inverter apparatus and an inverter apparatus control method. The inverter apparatus includes an inverter circuit and a control unit, and the control unit detects a driving mode of the inverter circuit based on a running state of the inverter circuit. When the inverter circuit outputs reactive power and an output current amplitude is greater than a current threshold, the control unit controls the inverter circuit in a full-bridge two-level bipolar control mode; and in other cases, the control unit controls the inverter circuit in a three-level control mode. This reduces a risk of breaking down horizontal bridge semiconductor switching devices by a voltage spike in an active turn-off process.

Inverter circuit control method and related apparatus

Embodiments of this application provide a power conversion circuit, a power transmission system, and a photovoltaic device. The power conversion circuit includes: a first bridge arm, where the first bridge arm includes a first upper bridge arm and a first lower bridge arm; the first upper bridge arm includes a switching component connected between an input positive end and an output end; the first lower bridge arm includes a switching component connected between the output end and an input negative end; each of the switching components includes a switching transistor and a first diode anti-parallel connected to the switching transistor.

Power conversion circuit, power transmission system, and photovoltaic device

A system receives a source database language statement according to a first dialect, determines a pattern of the source database language statement, the pattern comprising an abstract representation of the source database language statement, and checks whether the determined pattern is present in a cache of translations between patterns according to the first dialect and corresponding patterns according to a second dialect different from the first dialect. In response to the determined pattern being present in the cache of translations, the system converts, using a corresponding translation in the cache of translations, the source database language statement according to the first dialect to a respective target database language statement according to the second dialect.

Converting database language statements between dialects

A converter includes a power conversion circuit, a switching device, and a controller, and includes N phases, where N is 2 or 3. An input end of the power conversion circuit is connected to a direct current power supply, and the power conversion circuit converts a direct current output by the direct current power supply into an alternating current. The switching device includes at least the following two stages: a first-stage switching device and a second-stage switching device. The first-stage switching device and the second-stage switching device separately include N switches, and the N switches are connected in series to the N phases respectively. An output end of the power conversion circuit is connected to an alternating current power grid through the first-stage switching device and the second-stage switching device that are connected in series.

Power converter, photovoltaic power generation system, method, and apparatus

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.

Optimizer, photovoltaic power generation system, and IV curve scanning method for photovoltaic module

A two-stage turbocharging energy-efficient self-adaptive control method based on multi-point intake and exhaust pressures in diesel engine turbocharging field, including: determining a target turbocharging pressure for plains upon diesel engine speed and load conditions; adjusting it to obtain optimal target turbocharging pressures for varying altitudes; using these and measured multi-point pressures in intake and exhaust pipelines as inputs, based on an energy utilization analysis model, to determine the two-stage turbocharging energy utilization efficiency suitable for different altitude environmental conditions; according to the optimal overall efficiency principle of the two-stage turbocharging system at variable altitudes, calculating opening degrees of the bypass valves that meets the target total pressure ratio by a valve control unit. Reasonable distribution of exhaust energy between the two-stage turbochargers is achieved. The invention can achieve an efficient utilization of exhaust energy, and self-adaptive control of a variable-altitude two-stage turbocharging system.

Two-stage turbocharging energy-efficient self-adaptive control method based on multi-point intake and exhaust pressure

This application relates to the field of circuit technologies, and provides a step-up circuit and a step-up circuit control method. The step-up circuit includes a power supply, an inductor, N switch components, N-1 flying capacitors, N flyback diodes, a pre-charge unit, and an output unit. The N switch components are connected in series, a first switch component of the N switch components is connected to a first terminal of the power supply through the inductor, and an Nswitch component is connected to a second terminal of the power supply. At least two switch components of the N switch components have withstand voltage specifications different from each other. Values of voltages withstood by switch components with different withstand voltage specifications during normal operation are also different from each other. N is a positive integer.

Step-up circuit and step-up circuit control method

An intelligent variable mode control method for variable altitude turbocharging system of diesel engine, including: querying turbocharging pressure MAP chart upon speed and torque demands; reading a target pressure, and correcting it to obtain a corrected pressure; based on adaptive ranges of flow-pressure ratio of turbocharging modes, using fuzzy control algorithms to achieve intelligent selection of turbocharging modes; initializing opening degrees of high- and low-pressure stage bypass valves within adjustment ranges; using neural network fast prediction models to predict turbocharging pressures; using genetic algorithms to fast search bypass valve opening degrees corresponding the target and send them to the valve control unit. The invention achieves turbocharging mode selection and precise turbocharging pressure control during variable altitude operation of diesel engines, and achieves model-based intelligent variable mode adaptive optimization control of variable altitude diesel engine turbocharging systems.

Intelligent variable mode control method for variable altitude turbocharging system of diesel engine

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.

Power conversion circuit, inverter, and control method

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Shanghai, China

Lei Shi