Transferred Power Control for ICPT Pick-ups Utilizing Dynamically Switched Inductor*

This paper presents a method to maintain the output voltage constant under variable load resistance for ICPT power pick-ups. A phase-controlled variable inductor is dynamically swithched to detune/tune the resosant circuit according to the load resistance of the power pickup. Variations of the open circuit voltage and degraded resonance capacitor caused by high temperature are compensated by controlling the conduction delay angle of the phase-controlled inductor with deliberately designed resonant circuit parameters. The effect of equivalent inductance of the variable inductor on the power flow is analyzed theoretically with fundamental component ac analysis. Simulation results show that with the proposed method, a significant improvement is achieved in regulating transferred power of variable ratings.