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Circuit for obtaining a wide dimming ratio from a royer inverter

  • US 6,215,680 B1
  • Filed: 05/24/2000
  • Issued: 04/10/2001
  • Est. Priority Date: 05/24/2000
  • Status: Active Grant
First Claim
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1. A DC-to-AC inverter circuit for obtaining a wide dimming ratio in a display back light, said DC-to-AC inverter circuit adapted to receive power from a power source, said DC-to-AC inverter circuit comprising:

  • an inverter circuit, wherein said inverter circuit further comprises;

    a first transistor having a collector, base and emitter;

    a second transistor having a collector, base and emitter;

    a resistor coupled to said emitter of only one of said first transistor and second transistor; and

    a transformer having a base winding having a first lead coupled to said base of said first transistor and a second lead coupled to said base of said second transistor, a primary winding having a first lead coupled to said collector of said first transistor, a second lead coupled to said collector of said second transistor, and a center-tap lead coupled to said power source, and a secondary winding coupled to said back light.

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