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Figure 1. 

WPT concept for a mouse, with primary coil wrapped around a small mouse housing cage.

Figure 2. 

Schematic of the DTD technique.

Figure 3. 

Schematic using relay to tune the secondary circuit.

Figure 4. 

Using magnetic amplifier in the secondary circuit.

Figure 5. 

Using fast switching in the secondary circuit.

Figure 6. 

Designed switching capacitors of [26].

Figure 7. 

Controlling open circuit impedance of the secondary circuit.

Figure 8. 

SP topology of primary and secondary coils: (a) SP topology and (b) primary series compensation.

Figure 9. 

Initial switching capacitor technique (non-working).

Figure 10. 

Switching capacitor technique using a voltage doubler rectifier, whereby the source of the MOSFET is grounded on a common ground.

Figure 11. 

Block diagram of our CTD LCWPT system.

Figure 12. 

Experimental setup of our controllable LCWPT system.

Figure 13. 

Received power versus frequency/capacitance: (a) power versus frequency and (b) power versus capacitance with and without MOSFET.

Figure 14. 

WPT using multiple rodents in the same primary coil.

Figure 15. 

Plot of RID orientation with respect to time, to simulate angles of rat's head.

Figure 16. 

Four operational states of RID showing V_rec versus orientation.

Figure 17. 

Flow chart of control code for the CTD algorithm.

Figure 18. 

Performance of CTD system switching between four states of the RID, showing V_rec versus orientation.

Figure 19. 

Close-up of CTD system switching between four states in vicinity of segments h–i.