Boost Converter With Dynamic Input Impedance Matching For Energy Harvesting With Multi-Array Thermoelectric Generators
IEEE Transactions on Industrial Electronics(2014)
摘要
This paper presents a built-in input matching technique capable of handling a wide variation of multi-array thermoelectric generator (TEG) impedances ranging two decades, from 10 s to 1000 s of ohms. Maximum power point tracking (MPPT) control for a boost converter (BC) is introduced. The analytical expressions derived offer insight on the manner in which MPPT interacts with a BC to achieve best performance. The BC operates in a discontinuous conduction mode under pulse frequency modulation to minimize power consumption and maximize efficiency for light loads. Losses are minimized by implementing a pseudo-zero current switching control via the PMOS switch on/off time, and the output voltage is set using a global clocked comparator. A prototype was fabricated in 0.5 mu m CMOS where efficiency measurements showed a maximum value of 61.15% for an R-TEG = 33.33 Omega, and quiescent power consumption was 1 mu W.
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关键词
Boost converter (BC),DC-DC converter,energy harvesting,hermoelectric generator (TEG),maximum power point tracking (MPPT),power management,pulse frequency modulation (PFM),thermal harvesting,thermoelectric
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