Dept of Electrical Engineering The Hong Kong Polytechnic

Dept. of Electrical Engineering The Hong Kong Polytechnic University Power Electronics Research Prof. Eric Cheng Power Electronics Research Laboratory Dept. of Electrical Engineering http: //www. ee. polyu. edu. hk …. . Power the future

Dept. of Electrical Engineering The Hong Kong Polytechnic University Equipment and Research for Power Electronics • Largest Power Electronics Group in the region • 30 Research Personnel • 14 Academic staff • More than $10 M R&D funding in 2008 -2009 • Produces more than 40 Journal papers and 60 Conference papers in per year • Supporting research for automotive: DC power conversion, Battery technology, Electrical system, Lighting, Motor technology, Actuation, Green energy • The team is well-known in the region for EV and power electronics design http: //perc. polyu. edu. hk …. . Power the future

Dept. of EE Electric Vehicle (Opening in Exhibition Center) • Capability to develop EV from 2 k. W to 20 k. W • Real prototype • EV has designed: • My. Car. TM 2 k. W, 3 k. W, 6 k. W – Smart. TM 5 k. W-20 k. W – Golf cart 3 k. W, 4 k. W http: //www. ee. polyu. edu. hk …. . Power the future

Dept. of EE Electric Vehicle (Security car) Technology: • Battery management • Battery charger • Electrical system design • Vehicle lighting • Motor design • Motor drive • System control • Vehicle safety My. Car Specifications: Battery: Power: Range: Charging time: http: //perc. polyu. edu. hk Three My. Car(s) delivered at MTR Site 48 V 3. 5 k. W 100 km 8 hr(slow) 2 hr (fast) Site test at Diamond Coast International Kart circuit …. . Power the future

Dept. of EE EV show case http: //perc. polyu. edu. hk …. . Power the future

Dept. of Electrical Engineering The Hong Kong Polytechnic University DC voltage management and Power converters Technologies and Features: Soft-switching Resonant converter Simple and high performance in control Latest Power electronics Many different combinations in power conversion Soft-switching converter http: //www. ee. polyu. edu. hk Low profile magnetics High efficiency topology Low profile converter …. . Power the future

Dept. of Electrical Engineering Motor Drive Why our drive better : Fault tolerance Low cost – 20% < induction motor Low weight - 20% <induction motor Direct drive High power regenerative braking Extend to Anti-lock Braking System (ABS) Extend to Skid steering (EST) Research: machines design, driver, torque control, switching angle http: //perc. polyu. edu. hk Hong Kong Polytechnic University Technologies and Features: Based on switched-reluctance machines High efficiency High low speed torque Simple design and high performance 1 st SR in-wheel machines in the world IVVC control for inductors motors …. Power the future

Dept. of Electrical Engineering Hong Kong Polytechnic University My Car project – 1 st commercial selfdeveloped electric vehicle • To develop new generation Electric Vehicle • A HK and an Italian company support • Project $4 million • Duration 2 years • Funding source: HK Government and industry • Research: DC-DC power conversion, battery charger, electronic lighting. High power regeneration and motoring http: //www. ee. polyu. edu. hk …. Power the future

Dept. of Electrical Engineering Hong Kong Polytechnic University Robotic Arm for Rehabilitation • Training for Stoke patents • • 1 st mini-version in Hong Kong Joint research with Rehabilitation Science Use EMG signal to control the training method Research content: – Signal processing for EMG – Intelligent motion control – Motor torque control http: //perc. polyu. edu. hk …. Power the future

Dept. of Electrical Engineering Hong Kong Polytechnic University Polymer bonded Magnetics • To develop new generation Polymer-bonded magnetic devices • Four companies support • Project $4 million Duration 2 years • Brussel Innova Gold medal with Mention 2007 and China National invention award 2006 • Research: Modeling, Finite element, Converters http: //www. ee. polyu. edu. hk …. Power the future

Dept. of Electrical Engineering Hong Kong Polytechnic University Integrated Charger and Motor Drive • Combine two separate systems: Charger and motor drive into single system • $4 Million funding • Reduce cost, size and weight by half • Research: soft-switching, topology analysis Intelligent control http: //perc. polyu. edu. hk …. Power the future

Dept. of Electrical Engineering Hong Kong Polytechnic University LED and Solar street lamp • High power superbright LED • Maximum power point tracking • Thermal management http: //perc. polyu. edu. hk …. Power the future

Dept. of Electrical Engineering Hong Kong Polytechnic University Induction Heating • • Finite element Multi-coil design for inductor H-bridge resonant converter Consumer Design Award 2008 http: //perc. polyu. edu. hk …. Power the future

Dept. of Electrical Engineering Hong Kong Polytechnic University Examples of Large Industrial Projects • • • Automotive HID and LED lightings $8. 8 Million Polymer-bonded magnetic $4 Million IVVC control for motors $0. 72 Million In-Wheel motor for vehicle $4. 1 Million Next generation electric vehicle $4 Million Integrated charger and controller $4 Million Electric air-conditioning $2. 5 Million Induction heating wok station $0. 8 Million Vehicle charger network $0. 7 Million Linear motor - active suspension $6 Million • Funding source: Guangdong and HK Government, industry and University http: //www. ee. polyu. edu. hk …. Power the future

Dept. of Electrical Engineering Hong Kong Polytechnic University Electromagnetic Interference • The high frequency around, the environmental is full of high frequency EMI • The high dv/dt and di/dt induce high damaged voltage and current to attack the automotive system • Near field test • EMC signature http: //perc. polyu. edu. hk …. Power the future

Dept. of Electrical Engineering Hong Kong Polytechnic University Conclusion • 1 st plastic magnetic core for power conversion in the world • 1 st Large EV research group in Hong Kong • 1 st Self developed commercial electric vehicle in Hong Kong • 1 st in-wheel motor using the switched-reluctance technology • 1 st Integrated charger and motor drive in Town car • 1 st charger station network in Hong Kong • Largest power electronics research group in the region • Highest number of research papers in power electronics, machines and drives in the region http: //www. ee. polyu. edu. hk …. Power the future

Dept. of Electrical Engineering Hong Kong Polytechnic University Conclusion Power Electronics Research Centre (PERC) Fully supported from the industry and government. Research in fundamental study as well as applied research Aims - to help local industry and the region 电力电子研究中心(PERC) 得到了 业界和政府支持 基础研究和应用研究同时进行 目标 - 提升本地区及其 业界的竞争力 Contact: Prof. Eric Cheng, Dept. of EE, HK Poly. U Tel: +852 -27666162, Email: eeecheng@polyu. edu. hk …. Power the future http: //perc. polyu. edu. hk

Dept. of Electrical Engineering Hong Kong Polytechnic University The techniques we use • High frequency switching • Soft-switching • High frequency magnetics • High Speed synchronous conduction • Intelligent motor drives Features: • High power density • High reliability • High temperature range http: //www. ee. polyu. edu. hk …. Power the future