Electric lamp and discharge devices: systems – Pulsating or a.c. supply – With power factor control device
Reexamination Certificate
2008-01-08
2008-01-08
Philogene, Haissa (Department: 2821)
Electric lamp and discharge devices: systems
Pulsating or a.c. supply
With power factor control device
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.
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patent: 6011361 (2000-01-01), Blankers
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patent: 2000-123989 (2000-04-01), None
Buchanan & Ingersoll & Rooney PC
Philogene Haissa
Rubycon Corporation
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