전력전자학회논문지 (The Transactions of the Korean Institute of Power Electronics)

  • 제24권4호
  • /
  • Pages.268-272
  • /
  • 2019
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  • 1229-2214(pISSN)
  • /
  • 2288-6281(eISSN)
전력전자학회 (The Korean Institute of Power Electronics)
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배터리 기반 2단 충전 9 kJ/s 고전압 충전기 설계

Design of 9 kJ/s High Voltage LiPo Battery based 2-stage Capacitor Charger

  • Cho, Chan-Gi (Dept. of Energy Systems Engineering, Chung-Ang University) ;
  • Jia, Ziyi (Dept. of Energy Systems Engineering, Chung-Ang University) ;
  • Ryoo, Hong-Je (School of Energy Systems Eng., Chung-Ang University)
  • 투고 : 2019.01.21
  • 심사 : 2019.04.02
  • 발행 : 2019.08.20
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초록

A lithium polymer battery-based 9 kJ/s high-voltage capacitor charger, which comprises two stages, is proposed. A modified LCC resonant converter and resonant circuit are introduced at the first and second stages, respectively. In the first stage, the methods for handling low-voltage and high-current batteries are considered. Delta-wye three-phase transformers are used to generate a high output voltage through the difference between the phase and line-to-line voltages. Another method is placing the series resonant capacitor of the LCC resonant components on the transformer secondary side, which conducts considerably low current compared with the transformer primary side. On the basis of the stable operation of the first charging stage, the secondary charging stage generates final output voltage by using the resonance. This additional stage protects the rectifying diodes from the negative voltage when the output capacitor is discharged for a short time. The inductance and capacitance of the resonance components are selected by considering the resonance charging time. The design procedure for each stage with the aforementioned features is suggested, and its performance is verified by not only simulation but also experimental results.

키워드

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Fig. 1. Entire schematic of the proposed 2-stage high voltage capacitor charger.

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Fig. 2. Circuits of the proposed three phase high voltage capacitor charger (a) Original circuit diagram, (b) Modified circuit diagram for the design.

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Fig. 3. Simulation results of the proposed 9 kJ/s three phase high voltage capacitor charger.

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Fig. 4. Switching loss variation simulation results with snubber capacitances.

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Fig. 6. Proposed first charging part experimental waveforms with resistor load.

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Fig. 7. Resonant charging experimental waveforms (a) Saturation occur of the used reactor, (b) Saturation does not occur of the used reactor.

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Fig. 5. Simulation results of the proposed second charging part.

TABLE I SPECIFICATIONS OF THE 9 kJ/s 2-STAGE HIGH VOLTAGE CAPACITOR CHARGER

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TABLE II DESIGN PARAMETERS OF THE 9 kJ/s THREE PHASE HIGH VOLTAGE CAPACITOR CHARGER

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