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Direct current power source for an electric discharge lamp

  • US 4,358,717 A
  • Filed: 06/16/1980
  • Issued: 11/09/1982
  • Est. Priority Date: 06/16/1980
  • Status: Expired due to Term
First Claim
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1. A power supply for an electric discharge vapor lamp comprising, in combination,a source of a direct current potential,a ballast resistor,a VMOS insulated-gate field effect transistor having a gate electrode and a source-drain channel,first circuit means for serially connecting said channel and said vapor lamp across said source,second circuit means for connecting said ballast resistor in parallel with said channel,and regulating means responsive to variations in the magnitude of electrical energy delivered to said lamp for varying the potential applied to said gate electrode to control the conductivity of said channel.

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