Figures (8)  Tables (2)

    • Figure 1. 

      The variation of mutual inductance within the range of square coils and rectangular coils with coil offset.

    • Figure 2. 

      Variation in the positions of the receiving coil.

    • Figure 3. 

      (a) Overall structure of the couplers. (b) Dimensions of each part of the couplers. (c) System architecture diagram of the UAV charging system.

    • Figure 4. 

      System circuit structure. (a) Overall circuit diagram; (b) equivalent circuit diagram for State 1; (c) equivalent circuit diagram for State 2; (d) equivalent circuit diagram for State 3.

    • Figure 5. 

      Flowchart of the state switching control strategy.

    • Figure 6. 

      (a) Compensation for magnetic field strength. (b) Mutual inductance between coils with offset. (c) Variation of the charging efficiency with offset at different heights.

    • Figure 7. 

      (a) Experimental prototype. (b) Continuous and static waveforms of the oscilloscope before and after the control logic was added. (c) Changes in efficiency during a full offset.

    • Figure 8. 

      (a) Examples of the coupler reconstruction configuration for the SISO ccenario. (b) Coupler reconstruction configuration scheme in the MIMO scenario.

    • Parameter Value Parameter Value
      Uin 20 V LT1 2,395 μH
      f 86 kHz LT2 771 μH
      CT1 1.43 nF LR 787 μH
      CT2 4.44 nF CR 4.35 nF
      R 50 Ω NT1 35
      NT2 25 NR 90

      Table 1. 

      System simulation parameters.

    • Ref. ηDC-DC Coverage Misalignment tolerance Simplicity Comprehensive
      This paper 89.28% 83% $\star \star \star $ $\star \star $ $\star \star \star $
      [10] 87.1% 50% $\star $ $\star \star \star $ $\star $
      [25] 90.5% 44% $\star \star \star $ $\star \star \star $ $\star \star $
      [26] 84.9% 60% $\star \star $ $\star \star \star $ $\star \star $
      [27] 90.1% 67% $\star \star \star $ $\star \star \star $ $\star \star \star $
      [28] 93.1% 40% $\star \star \star $ $\star \star \star $ $\star \star $
      [29] 84.6% 67% $\star \star \star $ $\star $ $\star \star $
      * The higher the number of '$ \star $', the better the performance.

      Table 2. 

      Comparison between the coupler in this paper and existing research results.