H - Electricity – 05 – B
Patent
H - Electricity
05
B
H05B 41/26 (2006.01) H05B 41/292 (2006.01) H05B 41/38 (2006.01)
Patent
CA 2089301
LD 10,444 LOW VOLTAGE BALLAST CIRCUIT FOR A HIGH BRIGHTNESS DISCHARGE LIGHT SOURCE ABSTRACT OF THE INVENTION A low voltage DC input ballast circuit for a discharge lamp particularly suitable for a central lighting system includes an input filter stage which feeds into a first boost converter circuit controlled by way of a pulse width modulator device. The first boost converter provides warm-up and steady state run signals to the lamp in a voltage fed manner over a coupling circuit using components which are reduced in size relative to conventional discharge ballast circuits. Control circuitry provides various monitoring function , an example of which is that, in the event of a low input voltage, the lamp will operate in a dimmed or faded manner rather than maintain lumen output by drawing additional current. A second boost converter circuit is associated with a starter circuit arrangement and operates such that starting pulses can be generated and repeated if necessary in a very rapid manner.
Allison Joseph M.
Buchina Raymond A.
Davenport John M.
Mieskowski James D.
Thomas Edward J.
Company General Electric
Craig Wilson And Company
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