Abstract
This paper introduces the series synchronized triple bias-flip (S-S3BF) interface circuit for piezoelectric energy harvesting (PEH) enhancement. The S-S3BF topology is derived from its parallel counterpart (P-S3BF), which was proved to offer the maximum energy harvesting capability when three bias-flip actions are implemented. The S-S3BF is a little bit less capable than P-S3BF. However, it eliminates the circuit components by removing the bridge rectifier connected in parallel, such that can use only one capacitor to realize the bias voltages and energy storage simultaneously. Compared to the other single capacitor designs, the S-S3BF makes the best energy harvesting capability so far. Moreover, S-S3BF can automatically shift among single, double, and triple bias-flip operations under heavy, medium, and light load conditions, respectively. Therefore, it is more adaptive than previous designs. Theoretical and experimental results show that the harvested power can always follow the envelope (best case) of the single, double, and triple bias-flip operations during an entire charging process.
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