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Audio power conversion system

  • US 8,169,795 B2
  • Filed: 02/23/2007
  • Issued: 05/01/2012
  • Est. Priority Date: 02/24/2006
  • Status: Active Grant
First Claim
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1. An audio power conversion system, comprising:

  • a power supply having a positive supply rail and a negative supply rail for supplying power to a single ended class D amplifier; and

    a supply pump reduction circuit, connected to the supply rails and adapted to redistribute a pumping charge from said power supply by forcing a current-flow from a rail with a relatively higher voltage to a rail with a relatively lower voltage,wherein said supply pump reduction circuit comprises a high frequency transformer having a first and a second winding alternatingly connectable during a first and second cycle to said positive and negative supply rails, so as to cause a current to migrate from the rail with the highest voltage to the rail with the lowest voltage, while balancing said transformer, andwherein said supply pump reduction circuit further comprises;

    a first capacitor connected between a first common point and a second common point,a first switch connected between said second common point and a first terminal of the first transformer winding,a second switch connected between said second common point and a second terminal of the second transformer winding,a second capacitor connected between said first common point and a third common point,a third switch connected between said third common point and said first terminal on said first transformer winding,a fourth switch connected between said third common point and said second terminal on said second transformer winding andwherein a second terminal of said first transformer winding and a first terminal of said second transformer winding are connected to said first common point,so that a resonant tank is formed by a leakage inductance of said transformer and said capacitors, said resonant tank obeying the relationship;

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