2003
DOI: 10.1109/tuffc.2003.1193617
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Efficient charge recovery method for driving piezoelectric actuators with quasi-square waves

Abstract: In this paper, an efficient charge recovery method for driving piezoelectric actuators with low frequency square waves in low power applications such as mobile microrobots is investigated. Efficiency issues related to periodic mechanical work of the actuators and the relationship among the driving electronics efficiency, the piezoelectric coupling factor, and the actuator energy transmission coefficient are discussed. The proposed charge recovery method exploiting the energy transfer between an inductor and a … Show more

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Cited by 95 publications
(84 citation statements)
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“…For an EC based cooling cycle, Q c is proportional to Q(= T S) and W = αU e + U m , where U e is the charging electric energy applied to the EC material (a capacitive material). Using energy recovery electronics [22], a large portion of U e can be recovered; hence, α < 1. U m is all the other electric energy used to drive the EC cooling cycle.…”
Section: Resultsmentioning
confidence: 99%
“…For an EC based cooling cycle, Q c is proportional to Q(= T S) and W = αU e + U m , where U e is the charging electric energy applied to the EC material (a capacitive material). Using energy recovery electronics [22], a large portion of U e can be recovered; hence, α < 1. U m is all the other electric energy used to drive the EC cooling cycle.…”
Section: Resultsmentioning
confidence: 99%
“…To compound these requirements, the piezoelectric actuators used in the Harvard Microrobotic Fly require high fields (approximately 2 Vµm −1 ). Efficient, lightweight boost conversion [31], and drive electronics [32] for these actuators are ongoing research topics.…”
Section: Discussionmentioning
confidence: 99%
“…For a 100 milligram flyer, 10 mW of wing power would provide 100W kg −1 of body mass. Considering thorax losses, and assuming efficient charge recovery [4] from the piezoelectric actuator(s), 27 mW of battery power should be sufficient, which corresponds to a reasonable battery power density of about 600W kg −1 which can be obtained with current LiPoly battery technology (albeit in a 1 gram battery rather than the 50 milligram battery desired here).…”
Section: Resultsmentioning
confidence: 99%