×

Starting and operating circuit for arc discharge lamp

  • US 5,138,235 A
  • Filed: 03/04/1991
  • Issued: 08/11/1992
  • Est. Priority Date: 03/04/1991
  • Status: Expired due to Term
First Claim
Patent Images

1. A starting and operating circuit for a discharge lamp comprising:

  • a pair of AC input terminals adapted to receive an AC signal from an AC power supply;

    DC power supply means coupled to said AC input terminals for generating a DC voltage;

    oscillator means including a pair of semiconductor switches coupled to said DC power supply to receive said DC voltage;

    oscillator starting means coupled to one of said semiconductor switches, said oscillator starting means having an input and including a series circuit comprising resistor means and capacitor means connected at a junction point and a threshold element means connected to said junction point, the input of said oscillator starting means being coupled to one of said AC input terminals so that said capacitor means is charged only on one half cycle of said AC signal; and

    load means coupled to the output of said oscillator means and including said discharge lamp.

View all claims
  • 2 Assignments
Timeline View
Assignment View
    ×
    ×