Inverter

A high frequency alternating current (HFAC) system, the system comprising:

• a load circuit that includes:
• a power bus carrying HFAC for powering a plurality of inductively powered devices placed along the power bus;
• and
• a load circuit detector configured to detect electrical parameters of the load circuit;
• and
• an HFAC inverter that has a DC-DC circuit, an output power circuit and a controller, the output power circuit being arranged for inductive coupling with the load circuit, the output power circuit comprising:
• a DC to AC driver having a variable frequency output;
• a HFAC driver circuit comprising a resonant network comprising a first resonant tank, a second resonant tank and a third resonant tank, the first resonant tank comprising a series LC circuit and having a first resonant frequency, the second resonant tank comprising a parallel LC circuit and having a second resonant frequency, a third resonant tank having first part comprising a parallel LC circuit having a third resonant frequency and a second part comprising a series inductor, wherein the first resonant frequency, the second resonant frequency and the third resonant frequency are substantially the same;
• and
• a transformer coupled to the HFAC driver circuit and the load circuit.