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Figure 1. 

Topology of the dual-load WPT system with constant-voltage and constant-current capabilities.

Figure 2. 

Equivalent circuit model.

Figure 3. 

Equivalent circuit of #B output circuit. (a) Forward conduction mode. (b) Reverse conduction mode.

Figure 4. 

Schematic diagram of feedforward PI control.

Figure 5. 

Schematic diagram of the composite control strategy for dual-load WPT systems.

Figure 6. 

System operation flowchart.

Figure 7. 

Experimental platform.

Figure 8. 

Waveforms of the inverter's output voltage and current under different reference values. (a) I_a = 1 A,V_b = ±5 V. (b) I_a = 1.2 A,V_b = ±10 V. (c) I_a = 2 A,V_b = ±15 V. (d) I_a = 2.4 A,V_b = ±25 V.

Figure 9. 

Verification waveforms of independent power regulation. (a) I_a = 1.6 A,V_b = ±7.5 V. (b) I_a = 1.6 A, V_b = ±10 V. (c) I_a = 1.6 A,V_b = ±15 V.

Figure 10. 

Experimental waveforms of V_b polarity switching. (a) I_a = 1.2 A,V_b = ±10 V. (b) I_a = 2 A,V_b = ±10 V.

Figure 11. 

System transmission efficiency.

Figure 12. 

Dynamic response of the system. (a) R_a: 10 Ω→5 Ω→10 Ω. (b) R_a: 10 Ω→20 Ω→10 Ω. (c) R_a: 20 Ω→10 Ω→20 Ω. (d) R_b: 10 Ω→5 Ω→10 Ω. (e) R_b: 10 Ω→20 Ω→10 Ω. (f) R_b: 20 Ω→10 Ω→20 Ω.