Figures (10)  Tables (2)

    • Figure 1. 

      Overall circuit configuration of proposed WPT system and circuit configuration of the LCC-LCC compensated WPT system for CC charging.

    • Figure 2. 

      Circuit configuration of the LCC-S compensated WPT system for CV charging.

    • Figure 3. 

      Simplified circuit diagram and equivalent circuit diagram in CV mode. (a) Simplified circuit diagram. (b) Equivalent circuit diagram.

    • Figure 4. 

      Simplified circuit diagram and equivalent circuit diagram in CC mode. (a) Simplified circuit diagram. (b) Equivalent circuit diagram.

    • Figure 5. 

      Experimental prototype.

    • Figure 6. 

      Measured experimental waveforms in CC mode when the battery equivalent resistance RB is about (a) 5 Ω and (b) 10 Ω, respectively.

    • Figure 7. 

      Measured experimental waveforms at the CC-CV transition point when the battery equivalent resistance RB is about 25 Ω.

    • Figure 8. 

      Measured experimental waveforms in CV mode when the battery equivalent resistance RB is about (a) 70 Ω and (b) 140 Ω, respectively.

    • Figure 9. 

      Transient results with load step changes (a) from 5 to 10 Ω and (b) from 70 to 140 Ω.

    • Figure 10. 

      DC-DC efficiency curve of the proposed system during the whole charging process.

    • Parameters Value Parameters Value Parameters Value
      UD 40 V LP 100.3 uH CP1 175.4 nF
      UB 80 V LS 100.1 uH CP2 34.9 nF
      IB 3.2 A L1 19.8 uH CS1 365.2 nF
      f 85 kHz L2 9.6 uH CS2 38.8 nF
      M 20.4 uH RP 0.12 Ω RS 0.1 Ω

      Table 1. 

      Specific circuit parameters of the proposed LCC-LCC compensated WPT system.

    • Proposed in Ref. [10−13] Ref. [14−18] This study
      Method Hybrid topology switching Dual-frequency switching Automatic CC-CV transition
      Without detection circuits No No Yes
      Without communication links No No Yes
      Without open-circuit protection circuits No No Yes
      Without excess components and switches No Yes Yes
      Cost High Medium Low

      Table 2. 

      System configuration and cost comparison with existing popular methods