DISCHARGE LAMP LIGHTING DEVICE

PURPOSE:To give a proper driving signal to a switching element when a discharge lamp is not lighted. CONSTITUTION:Switching elements Q1 and Q2 connected in series to both ends of DC electric power supply E are turned on and off alternately, and a discharge lamp DL is lighted in a high frequency. A d...

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Bibliographische Detailangaben
1. Verfasser:	ERIGUCHI HIROYASU
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC,OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWERSUPPLY SYSTEMS CONTROL OR REGULATION THEREOF CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUTPOWER CONVERSION OR DISTRIBUTION OF ELECTRIC POWER ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY GENERATION
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Beschreibung
Zusammenfassung:	PURPOSE:To give a proper driving signal to a switching element when a discharge lamp is not lighted. CONSTITUTION:Switching elements Q1 and Q2 connected in series to both ends of DC electric power supply E are turned on and off alternately, and a discharge lamp DL is lighted in a high frequency. A driving signal is given to the positive electrode side switching element Q1 through a pulse transformer PT where a capacitor C5 is connected in series to primary winding (n1) from an oscillating circuit 4. A lighting condition of the discharge lamp DL is detected by a lamp electric current detecting circuit 2. AND of output of an oscillation control circuit 3 and the oscillating circuit 4 is taken up by an AND gate AND1, and when the discharge lamp DL is not lighted, only the negative electrode side switching element Q2 of the DC electric power supply E is turned on and off intermittently. Even when the discharge lamp DL is not lighted, the positive electrode side switching element Q1 of the DC electric power supply E is operated continuously, and transient vibration is prevented from being caused due to an inductance component of the pulse transformer PT and the capacitor C5.