Method and circuit for controlling current in a high...

Details Method and circuit for controlling current in a high... Method and circuit for controlling current in a high...

H - Electricity

05

B

H05B 41/14 (2006.01) H05B 41/288 (2006.01) H05B 41/36 (2006.01) H05B 41/38 (2006.01)

Patent

CA 2399896

A circuit for controlling current during run-up of a high pressure discharge lamp (140) comprises a buck converter (120) for generating a buck current to drive the high pressure discharge lamp and a control circuit (202) coupled to the buck converter (120) for varying the duty cycle of the buck current during run-up is disclosed. A method for controlling current in an electronic ballast during run-up of a high pressure discharge lamp comprises steps of detecting (501) lamp ignition, providing (502) a buck current to drive the lamp, and varying (504) the duty cycle of the buck current during run-up to control (506) the current in the lamp is also disclosed.

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