Power supply apparatus for discharge lamp and control method...

Electric lamp and discharge devices: systems – Pulsating or a.c. supply – With power factor control device

Reexamination Certificate

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C315S307000, C315S291000, C315S224000, C315S2090SC, C323S207000, C323S282000

Reexamination Certificate

active

07317286

ABSTRACT:
An apparatus supplies power to at least one discharge lamp. The apparatus includes a buck converter for regulating power supplied to at least one discharge lamp having a switching element driven by PWM pulses, and a control unit for supplying PWM pulses to the buck converter. The control unit includes a function for controlling an output power of the buck converter so as to be constant using PWM pulses of a first frequency; and a function for controlling an output voltage of the buck converter so as to be maximum using PWM pulses of a second frequency that is lower than the first frequency. The buck converter is capable of operating in discontinuous mode based on the PWM pulses of the second frequency.

REFERENCES:
patent: 5428268 (1995-06-01), Melis et al.
patent: 5909089 (1999-06-01), Deurloo et al.
patent: 6011361 (2000-01-01), Blankers
patent: 6020691 (2000-02-01), Sun et al.
patent: 6127816 (2000-10-01), Hirst
patent: 7157886 (2007-01-01), Agarwal et al.
patent: 2000-123989 (2000-04-01), None

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