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LAMP BALLAST DEVICE

  • US 3,772,565 A
  • Filed: 07/28/1972
  • Issued: 11/13/1973
  • Est. Priority Date: 07/28/1972
  • Status: Expired due to Term
First Claim
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1. Ballast apparatus for operating a gaseous discharge device from an alternating current source comprising, in combination, a transformer having a core of magnetic material providing a closed magnetic circuit, primary winding means on a first portion of said core and secondary winding means on a second portion of said core adapted to be connected in series with the gaseous discharge device, means for providing a predetermined secondary magnetizing reactance, a capacitor connected in series with said secondary winding means and having sufficient capacitive reactance for limiting current to the gaseous discharge device, and means for providing leakage reactance in the ballast apparatus which is between two and four times the capacitive reactance of said capacitor.

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