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Electromagnetic Energy Harvesting Circuit With Feedforward__ and Feedback DC-DC PWM Boost Converter.pdf

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Electromagnetic Energy Harvesting Circuit With Feedforward__ and Feedback DC-DC PWM Boost Converter

Electromagnetic Energy Harvesting Circuit with Feedforward and Feedback DC-DC PWM Boost Converter for Vibration Power Generator System Xinping Cao1, Wen-Ren Chiang2, Ya-Chin King2 and Yi-Kuen Lee1 1Department of Mechanical Engineering, Hong Kong University of Science and Technology Clear Water Bay, Kowloon, Hong Kong 2Department of Electrical Engineering, National Tsing Hua University Taiwan, ROC Abstract—This paper presents an integrated vibration power generator system. The system consists of a mini electromagnetic vibration power generator and a highly efficient energy harvesting circuit implemented on a minute PCB and a 0.35 μm CMOS integrated chip. By introducing a feedback control into the DC-DC PWM Boost Converter with feedforward control, the energy harvesting circuit can adjust the duty ratio of the converter following the variation of the input voltage and the voltage of energy storage element to get high energy conversion efficiency. The energy harvesting circuit rectifies the input AC voltage, step up the DC output of the rectifier by the DC-DC PWM Boost Converter with feedforward and feedback control and store the electric energy into a super capacitor, which can be used as a small electrical power supply for an intelligent micro sensor network. Index Terms— DC-DC PWM boost converter, energy harvesting, integrated power generator, micro sensor network, vibration. X. Cao, et al., “Electromagnetic Energy Harvesting Circuit With Feedforward and Feedback DC-DC PWM Boost Converter for Vibration Power Generator System,” IEEE Transactions on Power Electronics, Vol. 22, No. 2, pp. 679-685, 2007. /10.1109/TPEL.2006.890009 1 I. INTRODUCTION Vibration powered electronic devices have been applied in several commercial products, such as Seiko Kinetic wristwatch [1], smart tennis racquet [2] and smart sports shoes [3]. In recent years, the rapid development of micro sensors for various applications [4], including r