Method of and apparatus for generating an adjustable reactance

An adjustable reactance generator for a resonant inductive power transfer system, comprising:

• a comparator receiving an input sinusoidal waveform and outputting a square wave that retains the frequency and phase of the input sinusoidal waveform;
• a power switching circuit that receives said square wave as a control signal, said power switching circuit outputting a square wave that retains the frequency and phase of the input sinusoidal waveform;
• an adjustable power supply that adjusts the amplitude of the square wave outputted by said power switching circuit;
• an amplitude detector that controls the output level of the adjustable power supply based on an amplitude of the input sinusoidal waveform such that the frequency, phase and amplitude of the input sinusoidal waveform are replicated with the square wave outputted by the power switching circuit;
• and
• means for converting the output of the power switching circuit into a sinusoid having an adjustable reactance and providing said converted output of said power switching circuit to a load of the resonant inductive power transfer system.