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On the Sizing of the DC-Link Capacitor to Increase the Power Transfer in a Series-Series Inductive Resonant Wireless Charging Station

Author

Listed:
  • Andrea Carloni

    (Dipartimento Ingegneria dell’Informazione, University of Pisa, Via Caruso 16, 56122 Pisa, Italy)

  • Federico Baronti

    (Dipartimento Ingegneria dell’Informazione, University of Pisa, Via Caruso 16, 56122 Pisa, Italy)

  • Roberto Di Rienzo

    (Dipartimento Ingegneria dell’Informazione, University of Pisa, Via Caruso 16, 56122 Pisa, Italy)

  • Roberto Roncella

    (Dipartimento Ingegneria dell’Informazione, University of Pisa, Via Caruso 16, 56122 Pisa, Italy)

  • Roberto Saletti

    (Dipartimento Ingegneria dell’Informazione, University of Pisa, Via Caruso 16, 56122 Pisa, Italy)

Abstract

Wireless inductive-coupled power transfer is a very appealing technique for the battery recharge of autonomous devices like surveillance drones. The charger design mainly focuses on lightness and fast-charging to improve the drone mission times and reduce the no-flight gaps. The charger secondary circuit mounted on the drone generally consists of a full-bridge rectifier and a second-order filter. The filter cut-off frequency is usually chosen to make the rectifier output voltage constant and so that the battery is charged with continuous quantities. Previous works showed that an increase in power transfer is achieved, if compared to the traditional case, when the second-order filter resonant frequency is close to the double of the wireless charger excitation and the filter works in resonance. This work demonstrates that the condition of resonance is necessary but not sufficient to achieve the power increment. The bridge rectifier diodes must work in discontinuous-mode to improve the power transfer. The paper also investigates the dependence of the power transfer increase on the wireless excitation frequency. It is found the minimum frequency value below which the power transfer gain is not possible. This frequency transition point is calculated, and it is shown that the gain in power transfer is obtained for any battery when its equivalent circuit parameters are known. LTSpice simulations demonstrate that the transferred power can be incremented of around 30%, if compared to the case in which the rectifier works in continuous mode. This achievement is obtained by following the design recommendations proposed at the end of the paper, which trade off the gain in power transfer and the amplitude of the oscillating components of the wireless charger output.

Suggested Citation

  • Andrea Carloni & Federico Baronti & Roberto Di Rienzo & Roberto Roncella & Roberto Saletti, 2021. "On the Sizing of the DC-Link Capacitor to Increase the Power Transfer in a Series-Series Inductive Resonant Wireless Charging Station," Energies, MDPI, vol. 14(3), pages 1-13, January.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:3:p:743-:d:490415
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    References listed on IDEAS

    as
    1. Gautham Ram Chandra Mouli & Peter Van Duijsen & Francesca Grazian & Ajay Jamodkar & Pavol Bauer & Olindo Isabella, 2020. "Sustainable E-Bike Charging Station That Enables AC, DC and Wireless Charging from Solar Energy," Energies, MDPI, vol. 13(14), pages 1-21, July.
    2. Tommaso Campi & Silvano Cruciani & Francesca Maradei & Mauro Feliziani, 2019. "Innovative Design of Drone Landing Gear Used as a Receiving Coil in Wireless Charging Application," Energies, MDPI, vol. 12(18), pages 1-20, September.
    3. Andrea Carloni & Federico Baronti & Roberto Di Rienzo & Roberto Roncella & Roberto Saletti, 2020. "Effect of the DC-Link Capacitor Size on the Wireless Inductive-Coupled Opportunity-Charging of a Drone Battery," Energies, MDPI, vol. 13(10), pages 1-13, May.
    4. Tommaso Campi & Silvano Cruciani & Mauro Feliziani, 2018. "Wireless Power Transfer Technology Applied to an Autonomous Electric UAV with a Small Secondary Coil," Energies, MDPI, vol. 11(2), pages 1-15, February.
    5. Ali Bin Junaid & Aleksay Konoiko & Yahya Zweiri & M. Necip Sahinkaya & Lakmal Seneviratne, 2017. "Autonomous Wireless Self-Charging for Multi-Rotor Unmanned Aerial Vehicles," Energies, MDPI, vol. 10(6), pages 1-14, June.
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    8. Yi Wang & Fei Lin & Zhongping Yang & Zhiyuan Liu, 2017. "Analysis of the Influence of Compensation Capacitance Errors of a Wireless Power Transfer System with SS Topology," Energies, MDPI, vol. 10(12), pages 1-14, December.
    9. Woo-Seok Lee & Jin-Hak Kim & Shin-Young Cho & Il-Oun Lee, 2018. "An Improved Wireless Battery Charging System," Energies, MDPI, vol. 11(4), pages 1-12, March.
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