Patent ID: 7015769
Filing Date: 2006-03-21
Classification: A61N,H03J,H03L

Abstract:
1. An automatic tuning system for a magnetic field generator comprising: a processor; a power source; a tuned circuit comprising a magnetic field generating inductor (L) and an adjustable capacitor (C), the values of the L and C establishing the tuned circuit resonant frequency, a power amplifier coupled to the power source, said power amplifier having an output coupled to and adapted to drive the tuned circuit; a reference frequency oscillator circuit coupled to the power amplifier so as to cause the power amplifier to generate an output signal at a reference frequency; and a sense circuit coupled to the power amplifier and adapted to sense a signal indicative of the power delivered by the power amplifier to the tuned circuit and provide thereby a power level signal relating to such power delivered, whereby the power delivered by the power amplifier is a function of the resonant frequency of the tuned circuit, and wherein the processor monitors the power level signal and causes the adjustable capacitor to be adjusted to a capacitance value that maximizes the power delivered by the power amplifier.