System and method for powering, controlling, and communicating with multiple inductively-powered devices

  • US 6,047,214 A
  • Filed: 06/09/1998
  • Issued: 04/04/2000
  • Est. Priority Date: 06/09/1998
  • Status: Expired due to Term
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First Claim
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1. 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.

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