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Discharge Lamp Lighting Device, and Lighting Equipment and Lighting System Using the Device

  • US 20080030143A1
  • Filed: 09/16/2005
  • Published: 02/07/2008
  • Est. Priority Date: 10/26/2004
  • Status: Active Grant
First Claim
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1. A discharge lamp lighting device comprising:

  • a DC power source circuit;

    a smoothing capacitor connected to an output end of the DC power source circuit;

    an inverter main circuit adapted to convert a DC power output from the smoothing capacitor, to an AC power, and supply the AC power to a discharge lamp;

    a main control circuit adapted to control the inverter main circuit so as to control the AC power to be supplied to the discharge lamp;

    a timer circuit adapted to count a predetermined time;

    a power supply suppression section adapted to suppress power supply to the smoothing capacitor during a period where the timer circuit counts the predetermined time;

    a voltage/voltage drop detection section adapted to detect a voltage or a voltage drop of the smoothing capacitor at least during a period where the power supply to the smoothing capacitor is suppressed;

    a first comparator adapted to compare between a detection value of the voltage or the voltage drop of the smoothing capacitor and a first threshold value, and output a result of the comparison; and

    an auxiliary control circuit adapted to perform a control operation depending on the output of the first comparator.

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