Abstract
Common R or R-L load do not need special inverter circuits, however piezoelectric load can be considered as R-C load and its voltage does not become 0 even though the applied voltage is 0. Therefore it needs some special inverter with circuit that can discharge the capacitive energy. Especially for unidirectional square-wave voltage driving, it becomes more serious problem. In this paper, an energy recovery circuit for unidirectional square-wave voltage driving for piezoelectric load is proposed. With the circuit, the peak load current and the power supply capacity can be reduced because the energy in the load capacitor is saved to a capacitor for energy recovery and recharged from the capacitor. The appropriateness is proved from the simulation of the proposed circuit.
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