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Article

Power-Efficient Driver Circuit for Piezo Electric Actuator with Passive Charge Recovery

Toyota Central R&D Labs. Inc., Aichi 480–1192, Japan
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Energies 2020, 13(11), 2866; https://doi.org/10.3390/en13112866
Received: 13 April 2020 / Revised: 29 May 2020 / Accepted: 2 June 2020 / Published: 4 June 2020
(This article belongs to the Section F: Electrical Engineering)
Piezoelectric actuation is a promising principle for insect-scaled robots. A major concern while utilizing a piezoelectric actuator is energy loss due to its parasitic capacitance. In this paper, we propose a new concept to recover the charge stored in the parasitic capacitance; it requires only three additional lightweight passive components: two diodes and a resistor. The advantages of our concept are its small additional mass and simple operating procedure compared with existing charge recovery circuits. We provided a guideline for selecting a resistor using a simplified theoretical model and found that half of the charge can be recovered by employing a resistor that has a resistance sufficiently larger than the forward resistance of the additional diode. In addition, we experimentally demonstrated the concept. With a capacitive load (as a replacement for the piezoelectric actuator), it was successfully observed that the proposed concept decreased the power consumption to 58% of that in a circuit without charge recovery. Considering micro aerial vehicle (MAV) applications, we measured the lift-to-power efficiency of a flapping wing piezoelectric actuator by applying the proposed concept. The lift force was not affected by charge recovery; however, the power consumption was reduced. As a result, the efficiency was improved to 30.0%. We expect that the proposed circuit will contribute to the advancement of energy-saving microrobotics. View Full-Text
Keywords: driver circuit; charge recovery; piezoelectric actuator; power consumption driver circuit; charge recovery; piezoelectric actuator; power consumption
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MDPI and ACS Style

Ozaki, T.; Ohta, N. Power-Efficient Driver Circuit for Piezo Electric Actuator with Passive Charge Recovery. Energies 2020, 13, 2866. https://doi.org/10.3390/en13112866

AMA Style

Ozaki T, Ohta N. Power-Efficient Driver Circuit for Piezo Electric Actuator with Passive Charge Recovery. Energies. 2020; 13(11):2866. https://doi.org/10.3390/en13112866

Chicago/Turabian Style

Ozaki, Takashi, and Norikazu Ohta. 2020. "Power-Efficient Driver Circuit for Piezo Electric Actuator with Passive Charge Recovery" Energies 13, no. 11: 2866. https://doi.org/10.3390/en13112866

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