Dimmable ballast with resistive input and low...

Details Dimmable ballast with resistive input and low... Dimmable ballast with resistive input and low...

2006-10-17

2006-10-17

Vo, Tuyet (Department: 2821)

Electric lamp and discharge devices: systems

Periodic switch in the supply circuit

Silicon controlled rectifier ignition

C315S276000, C315S244000

Reexamination Certificate

active

07122972

ABSTRACT:
An AC to AC power conversion apparatus with constant power feeding characteristics to fluorescent lamp or FD lamp is described. The constant power characteristic is achieved by discontinuous mode operation of capacitor coupled in series with the load. Packets of energy are pumped out to the load in each switching cycle, regardless of the resonant characteristics. The dependence of the input power on the square of the supply voltage make the input resistive and produces good power factor automatically. The lamp load is dimmable by external phase control dimmer like resistive incandescent lamps. Multiple lamp loads with different power rating can be integrated by adding more sets of said capacitors and associated components.

REFERENCES:
patent: 4585974 (1986-04-01), Stupp et al.
patent: 5065072 (1991-11-01), Albou et al.
patent: 5510681 (1996-04-01), Nilssen
patent: 5841239 (1998-11-01), Sullivan et al.
patent: 6483256 (2002-11-01), Heckmann
patent: 6545431 (2003-04-01), Hui et al.
patent: 2002/0033679 (2002-03-01), Hui et al.
patent: 2005/0035723 (2005-02-01), Muramatsu et al.
patent: 2005/0110431 (2005-05-01), Ben-Yaakov

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