Discharge lamp operating circuit

Details Discharge lamp operating circuit Discharge lamp operating circuit

H - Electricity

05

B

315/54

H05B 41/24 (2006.01) H05B 41/288 (2006.01)

Patent

CA 1187544

- 15 - DISCHARGE LAMP OPERATING CIRCUIT ABSTRACT OF THE DISCLOSURE A lamp operating circuit comprising a DC power source, an inventor including step-up transformer inductance windings and a controlled transistor switch connected across the output of the DC source, and a high frequency oscillator coupled to the transistor switch for operating the same at predetermined intervals. A low wattage HID lamp is connected across the inverter through a ballast capacitor series connected to one terminal of the lamp and a ballast inductance coupled in series with the other lamp terminal. The ballast inductance and ballast capacitor are selected to resonate sinusoidally at a frequency having a half period coinciding with the on-time of the transistor.

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