Power supply for halogen lamp

Details Power supply for halogen lamp Power supply for halogen lamp

H - Electricity

05

B

H05B 39/04 (2006.01) H02M 1/08 (2006.01) H02M 7/44 (2006.01) H05B 39/02 (2006.01)

Patent

CA 2618239

A circuit (10) for powering a halogen lamp (20) comprises an inverter (100) and an output circuit (300). During operation, the inverter (100) and output circuit (300) provide a magnitude-limited current to the halogen lamp such that the lamp power during an initial period is substantially less than the lamp power during a steady-state operating period. Preferably, output circuit (300) is a non-isolated circuit that includes a current- limiting inductance, and inverter (100) includes a frequency control circuit (R2,C4,C7,Q3,R3,R5,C8) for operating the inverter at a higher frequency during the initial period so as to reduce stress upon the lamp filament and preserve the operating life of the lamp. The circuit (10) is especially suitable for powering low voltage halogen lamps.

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