Shanghai Jiaotong University

Agora Lab, Inc.

Saint-gobain Abrasives, Inc.

Saint-gobain Abrasifs

Southchip Semiconductor Technology(shanghai) Co., Ltd.

China Railway Engineering Equipment Group Co., Ltd.

Lin Feng

Wei Xiao

Wei Shi

Xiuchen Jiang

Guojie Li

Keyou Wang

Bei Han

Juhui Yang

Dan Lv

Qian Zhou

Kai Wang

Lijun Hang

Xiaoran Wu

Tianbo Chen

Xidong Zhang

Yangyi Yan

Tianren Yang

Xin Huang

Jianbin Li

Weiming Chen

Ying Zhu

Adiseshaiah K Seshu

Lianhui Jia

Yu Xiang Yang

Jianlong Gao

Wei Wang

Xingjian Zhuo

Dujuan Wang

Lixun Zhang

Qingzeng Yu

The present disclosure provides a power supply control circuit and control method for a switching power supply system. The control circuit includes: a power transistor and current sampling module, a voltage common collector (VCC) charging management module, a switch module, and a voltage regulator clamping module. The power transistor and current sampling module includes: a main switch high-voltage power transistor, a power transistor driver, an auxiliary sampling high-voltage transistor, and a current sampling resistor. The switch module includes a first switch, a second switch, a third switch, and a fourth switch. The present disclosure realizes time-division multiplexing and seamless transition through a reasonable timing of the switch module, thereby enabling multiplexing of high-voltage devices reducing demands for high-voltage processes, saving chip costs, and reducing design difficulty.

Power supply control circuit and control method for switching power supply system

A new real-time video communication system includes a set of electronic devices. Each device runs a specialized real-time video communication software application including a video quality module. The video quality module retrieves network connection statistic data from a network connection module, and video encoder statistic data from a video quality module. The video quality module uses the network connection statistic data and the video encoder statistic data to determine a first objective video quality measure without extensive mathematical operations. The video quality module also uses the first objective video quality measure, the network connection statistic data and the video encoder statistic data to determine a second objective quality measure without extensive mathematical operations.

System for determining an objective video quality measure of a real-time video communication without extensive mathematical operations

System and method for determining an objective video quality measure of a real-time video communication without extensive mathematical operations

Nonlinear control method for the micro-grid inverter with anti-disturbance. By generating reference currents that satisfy specific active and reactive power command under various working conditions, and introducing a nonlinear control method based on Lyapunov function to control the inverter, fast and accurate tracking of the generated reference signals is realized. The method realizes effective decoupling control of active power and reactive power. The system has high dynamic response and good robustness. Besides, the control structure of the method is simple and easy to implement, and the synchronous control link and the additional voltage and current regulator are omitted. The method realizes fast and accurate power exchange and stable power transmission between the inverter and the grid in the micro-grid under various working conditions, and provides a guarantee for improving the energy management efficiency within the micro-grid.

Nonlinear control method for micro-grid inverter with anti-disturbance

A feedforward voltage series compensator based on complimentary use of wind, solar, and electric power comprising a controller, a rectifier unit, an H bridge inverter, a series transformer, a wind-power DC voltage sensor, a wind-power DC current sensor, an AC voltage transducer, a DC boost unit, a PV DC voltage sensor, a PV DC current sensor, and a grid-connected inverter. The compensator makes use of wind-electric and photovoltaic-electric complimentary interactions to solve the traditional energy issue for series compensator, and as the grid-connected inverter is feedforward, there is extra capacity for the series transformer and the series complimentary inverter unit, and hence it enjoys the feedforward and quick voltage complimentary characteristics of the wind and solar power generation.

Feedforward voltage series compensator based on complementary use of wind power and photovoltaic power

A method for designing cascaded multi-level inverters with minimization of large-scale voltage distortion, based on KKT (Karush-Kuhn-Tucker) conditions and with simplified computation of conduction angles, simplifies the computation process, and is conducive to on-line calculation. Meanwhile, its fundamental voltage is adaptive, minimization of total harmonic is realized for cascaded multi-level inverters at high-voltage, and voltage power quality at grid connected nodes is improved.

Method for designing cascaded multi-level inverter with minimized large-scale voltage distortion

A cloth backing for an abrasive article is treated by combining a phenolic resin, a latex and a colloidal silicon oxide composition to prepare a colloidal formulation, which is then applied to the cloth backing and cured. Coated abrasive articles are formed by applying a make coat formulation to the treated cloth backing, applying an abrasive and then curing the make coat formulation.

Coated abrasive backings with cloth treated with colloidal silicon oxide

Growing community of inventors

Shanghai, China

Lin Feng