DISCHARGE LAMP DEVICE
A discharge lamp device is provided to perform protection operation by detecting non-lighting of any one of a plurality of discharge lamps connected in parallel without a separate circuit to prevent erroneous operation. A discharge lamp includes a high frequency generation circuit(2), a transformer(...
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Sprache: | eng |
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Zusammenfassung: | A discharge lamp device is provided to perform protection operation by detecting non-lighting of any one of a plurality of discharge lamps connected in parallel without a separate circuit to prevent erroneous operation. A discharge lamp includes a high frequency generation circuit(2), a transformer(3), a plurality of discharge lamps(4), and an abnormality detection circuit(7). A primary side of the transformer is connected to an output side of the high frequency generation circuit. The plurality of discharge lamps are connected to a secondary side of the transformer in parallel. The abnormality detection circuit has a magnetic body wound with a magnetic flux detecting winding(52) and a plurality of windings(51) connected to the discharge lamps in series and determines abnormality of the discharge lamp by detecting that a sum of magnetic flux of the windings is zero when all the discharge lamps are normally lighted and the sum of magnetic flux of the windings is not zero when at least one discharge lamp is not normal. |
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