Patent ID: 6047214
Filing Date: 2000-04-04
Classification: A61N,H02J

Abstract:
A system for powering one or more arbitrarily oriented inductively coupled devices, comprising an energizing coil assembly, said assembly comprising:(a) an energizing coil for inductively powering said arbitrarily oriented inductively coupled devices;(b) magnetic field sensing means coupled to said energizing coil for determining the strength and phase of said energizing coil's magnetic field;(c) pulse width modulation and phasing circuit means for producing a pulse width modulated output signal, said pulse width modulation and phasing circuit means comprising gain compensation means for producing a pulse width modulated output signal for monitoring a prescribed current within said energizing coil and phase compensation means for maintaining a fixed phase delay between said energizing coil and a clock source; and(d) a power amplifier coupled to said pulse width modulation and phasing circuit means for amplifying the pulse width modulated output signal in order to drive said energizing coil.