Step-controllable electronic ballast

  • US 4,963,795 A
  • Filed: 03/02/1989
  • Issued: 10/16/1990
  • Est. Priority Date: 01/23/1989
  • Status: Expired due to Term
First Claim
Patent Images

1. An arrangement comprising:

  • a source of alternating supply voltage;

    lamp means having lamp terminals; and

    power supply means having a first, a second and a third power input terminal;

    the power supply means having output terminals connected with the lamp terminals and being operative to provide AC power to the lamp means in response to being provided with the supply voltage between the first and either the second or the third power input terminal;

    the AC power being associated with an AC voltage;

    the frequency of the AC voltage being substantially higher than that of the voltage normally present at an ordinary electric utility power line;

    the AC power having a magnitude that is substantially higher when the supply voltage is provided between the first and the second power input terminal as compared with a situation wherein the supply voltage is provided between the first and the third power input terminal.

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