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This paper presents a self-powered interface circuit for micromachined piezoelectric energy harvesters (PEH). The system implements the Synchronous Electric Charge Extraction (SECE) technique. Micro- and millimeter-scale PEHs are usually limited to tens or hundreds of microwatts with output voltages that typically do not exceed 1–3 V. Through system- and circuit-level optimizations the proposed interface...
An energy harvesting system including a novel front-end multi-stage rectifier (AC-DC) charge pump, a power management, low-dropout voltage regulator (LDO) and a battery charger is presented in this work. The designed circuit is realized by the TSMC 0.35um CMOS process. The proposed circuit system is suitable for harvesting the low-frequency vibration energy in portable medical sensors or low-power...
This paper presents an implementation of a fully-integrated switched capacitor voltage converter with self-adjusting source loading. A charge control unit ensures improved load matching to the power source, which can be an RFID antenna or vibration energy harvesting generator. In conjunction with an adaptive stacking scheme voltage-up conversion is also realized leading to capacitor storage voltages...
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