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Power supply with reduced second harmonic

  • US 6,141,227 A
  • Filed: 07/08/1999
  • Issued: 10/31/2000
  • Est. Priority Date: 06/03/1999
  • Status: Expired due to Term
First Claim
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1. A power supply for supplying power to a load circuit intended to operate at a design frequency or within a design frequency range including:

  • an input for alternating current;

    rectifier means for converting the alternating current at the input to direct current; and

    inverter means for supplying said direct current to a parallel resonant load circuit, said power supply characterised by including;

    means for reducing amplitude of at least a second harmonic of a fundamental frequency of a current output by said inverter to produce a treated power signal; and

    means for filtering said treated power signal, said filter means having a roll-off frequency at least approximately equal to the design frequency or a frequency in the design frequency range of said load circuit.

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