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A wideband electric interface based on pulse width modulation (PWM) for a piezoelectric energy harvester is investigated. The switching interfaces are used to increase the output power of energy harvesting devices for a wide frequency range. It is shown that the energy harvesting technique can effectively enable harvested power to be the maximum possible value for a dynamic electromechanical system for all excitation frequencies. The proposed wideband interface is composed of a full-bridge converter with PWM modulation. The piezoelectric voltage is adaptive to the vibration. In the final experiment, the PWM interface harvested more energy in the case of multi-frequency vibration.
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1. Chen, Y.Y., Vasic, D., Costa, F., Wu, W.J., Lee, C.K.: ‘A self-powered switching circuit for piezoelectric energy harvesting with velocity control’, Eur. Phys. J. Appl. Phys., 2012, 57, p. 30903 (doi: 10.1051/epjap/2012110355).
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