Dual feedback control for a high-efficiency class-d power amplifier circuit

  • US 5,118,997 A
  • Filed: 08/16/1991
  • Issued: 06/02/1992
  • Est. Priority Date: 08/16/1991
  • Status: Expired due to Fees
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First Claim
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1. A dual feedback control system for a Class-D power amplifier circuit including a resonant circuit having a variable impedance, comprising:

  • a phase control feedback loop, including phase detecting means for detecting the phase angle between the resonant circuit voltage and resonant circuit current, said phase control feedback loop varying the phase angle of the resonant circuit current to tune said resonant circuit under different load conditions; and

    an amplitude control feedback loop, including amplitude comparator means for comparing the amplitude of the resonant circuit impedance with a reference amplitude, said amplitude control feedback loop varying the amplitude of the resonant circuit current to tune said resonant circuit under different load conditions.

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