Inductively coupled ballast circuit

  • US 7,385,357 B2
  • Filed: 11/28/2006
  • Issued: 06/10/2008
  • Est. Priority Date: 06/21/1999
  • Status: Expired due to Term
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First Claim
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1. A ballast circuit comprising:

  • a primary subcircuit having a primary coil;

    a current sensor connected to said primary subcircuit, said current sensor sensing a characteristic of a current in said primary subcircuit;

    a control circuit supplying current to said primary coil, said control circuit varying a characteristic of the current supplied to said primary coil as a function of said characteristic sensed by said current sensor;

    a secondary coil inductively coupled with said primary coil, wherein said primary coil inductively energizes said secondary coil;

    a load electrically connected to said secondary coil, whereby power is provided to said load by said secondary coil; and

    an oscillator including a buffer circuit that prevents load changes from pulling the frequency of oscillation of said oscillator.

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