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ELECTRONIC BALLAST FOR A HIGH INTENSITY DISCHARGE LAMP

  • US 20100194287A1
  • Filed: 01/29/2008
  • Published: 08/05/2010
  • Est. Priority Date: 02/01/2007
  • Status: Abandoned Application
First Claim
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1. An electronic ballast for a high intensity discharge lamp, of the type comprising:

  • (a) a rectifier circuit receiving alternating current (AC) from an alternating current source and converts it to direct current (DC);

    (b) a power factor correction circuit increasing the direct current voltage (DC) coming out from said rectifier circuit and reducing the overall harmonic distortion;

    y, (c) a current converter circuit receiving high voltage direct current (DC) coming out from the power factor correction circuit and converts it to high or low frequency alternating current (AC), which is supplied to said high intensity discharge lamp;

    said ballast being characterized in that it comprises additionally;

    d) an ignition circuit generating ignition pulses being fed to the current converter circuit to turn on the lamp, the ignition pulses being generated according to a downward frequencies scan; and

    ,e) a control circuit connected to the ignition circuit and to the converter circuit, wherein said control circuit commands the operation of the ignition circuit to turn on the lamp and controls the power being supplied to the lamp from its turning on to its turning off according to a power profile stored in said control circuit and determined by the lightning conditions a user desires to obtain from said lamp in order to save energy.

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