Abstract
This paper provides an analysis for the performance evaluation of a piezoelectric energyharvesting system using the synchronized switch harvesting on inductor (SSHI) electronicinterface. In contrast with estimates based on a variety of approximations in the literature,an analytic expression of harvested power is derived explicitly and validated numerically forthe SSHI system. It is shown that the electrical response using an ideal SSHI interface issimilar to that using the standard interface in a strongly coupled electromechanicalsystem operated at short circuit resonance. On the other hand, if the SSHI circuitis not ideal, the performance degradation is evaluated and classified accordingto the relative strength of coupling. It is found that the best use of the SSHIharvesting circuit is for systems in the mid-range of electromechanical coupling. Thedegradation in harvested power due to the non-perfect voltage inversion is notpronounced in this case, and a new finding shows that the reduction in power is muchless sensitive to frequency deviations than that using the standard technique.
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