Starting circuit for a high intensity discharge lamp

Details Starting circuit for a high intensity discharge lamp Starting circuit for a high intensity discharge lamp

H - Electricity

05

B

H05B 41/18 (2006.01) H05B 41/04 (2006.01)

Patent

CA 2100630

STARTING CIRCUIT FOR A HIGH INTENSITY DISCHARGE LAMP ABSTRACT OF THE DISCLOSURE A starting circuit is used in combination with a high intensity discharge lamp having electrodes. An inductor is in series with the electrodes of the lamp, and a first switching transistor is arranged in series with a diode and a load resistor. The first switching transistor, diode, and resistor are arranged in shunt with the electrodes of the lamp and in series with the inductor for charging the inductor when the first switching transistor is switched ON. The energy stored in the inductor is discharged as a voltage pulse across the lamp when the first switching transistor is switched OFF. A first bias circuit turns the first switching transistor ON at a first voltage level from an AC power source. A second switching transistor turns the first transistor OFF at a second voltage level. A second bias circuit turns the second switching transistor ON at the second voltage.

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