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Fluorescent lamp flashing circuit and control

  • US 5,936,356 A
  • Filed: 09/22/1998
  • Issued: 08/10/1999
  • Est. Priority Date: 09/22/1998
  • Status: Expired due to Fees
First Claim
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1. A fluorescent lamp flashing circuit comprising a fluorescent lamp to which is connected a heater voltage, an alternating current supply voltage source connected to said fluorescent lamp through a series connected loading reactance device which provides current limiting, a switching device to disconnect and reconnect said alternating current supply voltage source from said fluorescent lamp at a predetermined frequency rate, a control circuit to control the operation of said switching device to produce said predetermined frequency rate, and a bypass full wave rectifier bridge associated with said switching device to connect said loading reactance device in parallel with said supply voltage source and with a bleeding resistance to load said bridge and form a resonance circuit to maintain said loading reactance device constant and permitting an energy exchange between said supply voltage source and said loading reactance device in a resonant mode thereby maintaining a sine wave form and minimizing loss when said switching device is in a "closed" conductive state.

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