Conference

Effects of power circuit design & layout on IGBT performance
Vijay Bolloju, International Rectifier, United States of America
Jun Yang, International Rectifier, United States of America

Insulated Gate Bipolar Transistor (IGBT) is emerging as the switch of choice in a wide variety of applications, both in traditional and emerging applications. The demands of achieving compact and efficient systems are pushing the switching frequencies higher. So having a good layout for the switching circuit is paramount to achieving performance vs. robustness balance. This article discusses the effects of switching circuit layout and provides practical guidelines on reducing circuit parasitics and their undesirable effects on the system performance.

New LED Streetlamp Power Architecture with Dynamic Headroom Control
Vern Li,  National Semiconductor, Hong Kong
Tony Lai, National Semiconductor, Hong Kong

In designing LED streetlight applications, light efficacy and system reliability are key technical considerations.  Light efficacy of the LED streetlight is determined by power conversion efficiency of electrical drive and light efficacy that delivered by the LEDs. And, reliability of the LED streetlight is determined by thermal management of the LEDs and electrical drive, fault detection and protection of the system, as well as electrical component counts. This paper introduces a new LED streetlight power architecture with dynamic headroom control.  Also, to discuss its operation principles and advantages.

How to improve IGBT paralleling reliability for high power converters
Xiankui Ma, Mitsubishi Electric & Electronics (Shanghai) Co., Ltd., China
Jianfei Li, Emerson Network Power, China

This paper will illuminate that IGBT could be used in parallel from IGBT chip performance and the key points on handling both the transient state and the steady state. This paper will also give the actual test waveforms for the recommended drive circuit, which is also compared with the other 2 kinds of drive circuits.

Research on Mutual-Feeding Mutual-Driving Test-Bed for Permanent Magnetic Synchronous Motors
Shuxin Tian, Ruking, China
Yongxin Zhang, Ruking, China
Xijun Yang, Ruking, China
Jianguo Jiang, Shanghai Jiao Tong University, China

A mutual-feeding mutual-driving test-bed for servo driver-PMSM is designed in this paper. On the basis of the description of vector control, mechanical shaft modeling of the test-bed is established, and simulation analysis utilizing SIMULINK are completed. Based on a practical established mutual-feeding mutual-driving test-bed for servo driver and PMSM, the actual servo driver-PMSM is experimented. Compared with other existing test-bed, the running efficiency of this test-bed is higher. Power losses and efficiencies of test-bed for shared AC bus and shared DC bus are analyzed respectively, and the concept of Energy Efficiency Ratio (EER) is put forward at first, which is a useful representation of energy-saving effectiveness of a test-bed.

Air-conditioner compressor controlled by sliding mode current observer using Infineon 8bit Microcontroller
Weizhe Qian, Infineon Technology, China

This paper reports sensorless FOC implementation using Infineon 8bit micro-controller for air-conditioner compressor application. Unlike other DSP implementation, XC878 provides a special hardware vector computing unit including Multiplication & Division Unit (MDU) and CORDIC to achieve the heavy and complicated computation of the algorithm, eg. PI controller, Park/Clarke transform, sliding mode observer. The algorithm has been tested on a Panasonic rotary compressor with full air-conditioner load and proved to be a cost-effective solution.

Low-cost Dimmer for Dimmable Low-Consumption Lamps
Laurent Gonthier, STMicroelectronics, France
Antoine Passal, STMicroelectronics, France

Due to the new EuP (energy using products) 2005/32/EC Directive, domestic lamps are fast moving to low-consumption technologies. This paper first explains the reason for the dysfunctioning of Triac-based dimmers working with CFL lamps. Two new schematics are then proposed to solve this issue and design a dimmer that could work with every dimmable low-consumption lamp, such as CFL or high-brightness LED lamps.

Universal Modular Driver of Electro Luminescent Panel with Selective Harmonic Elimination
Chien-Lung Cheng, National Formosa University, Taiwan
Jim-Chwen Yeh, National Formosa University, Taiwan
Shyi-Ching Chern, National Formosa University, Taiwan
Tsung-Han Lin, National Formosa University, Taiwan

In this paper, the universal modular driver of Electro Luminescent (E.L.) panel with selective harmonic elimination is proposed. The developed driver can enhance the applicability of luminescent panels.

The Thermal Simulation For Planar Magnetic Components Of Power Converter
Yao Kai, Huawei Technologies, China
Song Qingliang, Huawei Technologies, China

The winding is made up of PCB in planar magnetic components and the heat dispersion is important to power converter. The paper gives a method to evaluate the thermal design of the planar magnetic components. The simulation is consistent with the measurement . And it can be used in engineering design.

The Real Time Identification of Inrush Current and Fault Current for Transformer Applying
Shock Response Spectrum Analysis
Chien-Lung Cheng, National Formosa University, Taiwan
Jim-Chwen Yeh, National Formosa University, Taiwan
Chen-Chang Yang, National Formosa University, Taiwan
Sheng-I Yang, National Formosa University, Taiwan

In this paper, differential protection devices for primary protection device for the transformer is one of the basic principles of long maturity, the protection device of the most critical and most difficult problem is how to prevent the magnetizing inrush current caused by differential protection device malfunction, which offered exciting inrush current discrimination measures. How to distinguish between reliable and magnetizing inrush current and fault current, this paper shock response spectrum (SRS) analysis to identify magnetizing inrush current, through the Matlab software, computing, and SRS to be addressed, extracting characteristics of magnetizing inrush current can be found SRS analysis method can reliably distinguish magnetizing inrush current , and the practical application of the Programmable System-on-Chip and peripheral equipment, to achieve real-time of the effect.

A DC/DC converter with active filter capabilities for residential PV generators
Romeo Letor, STMicroelectronics, China
Antonio Testa, University of Messina, Italy

In the residential field grid-connected Photo Voltaic (PV) generators are generally connected to single phase AC grids. In these cases a periodical power unbalance is generated because the power drawn by the grid features a large ripple at twice the fundamental frequency, while PV modules generate a DC power. Such a power unbalance affects the Maximum Power Point Tracking (MPPT) and forces the system to operate under suboptimal conditions. In this paper a new approach is presented dealing with the realization of an active filter inside the DC/DC step up converter, without the introduction of extra power devices. According to the proposed approach the size of the electrolytic capacitor bank can be largely reduced, thus improving the reliability, while lowering costs and size.

Intelligent Power Module for Electric Vehicle applications
Xiguo Gong, Mitsubishi Electric & Electronics (Shanghai), China
Yandong Xu, Shanghai Edrive, China

In the late of 1980s, Mitsubishi Electric introduced the concept of ‘Intelligent Power Module’ and manufactured the first generation IPM, integrating dedicated driver and protection circuits with the IGBT in an appropriate packaging. Since that time, Mitsubishi Electric had developed 5 generations of IPMs. This paper presents the latest technologies in chip and packaging of IPM. The latest IGBT chip technology Full Gate CSTBT^TM can achieve the best trade-off relationship between saturation voltage and turn-off power loss. The new series IPM offers significant improvement in V_CE(sat) ,reducing to 1.75V from 1.9V for conventional ones , by keeping the Eoff almost at the same level. New integrating technology is also applied to optimize the protection functions. In addition, reliability of power cycle and thermal cycle are improved, too.