H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/66
H05B 41/36 (2006.01) H05B 41/392 (2006.01)
Patent
CA 1203561
37 ABSTRACT OF THE DISCLOSURE Lead-type ballast apparatus operable to program and control the operating performance of a high-intensity- discharge sodium lamp. The basic lead-type ballast com- prises a current-limiting high-reactance transformer hav- ing a capacitor connected between the transformer output terminals and the lamp to be operated. A pulse-generating means is normally associated with the transformer secon- dary and is operable to generate high-voltage pulses when the apparatus is energized which are applied through the capacitor to initiate a discharge within the lamp. There is also provided an additional inductor which is connected in circuit in one of (1) a parallel connection across the capacitor and (2) a connection across the transformer secondary. An "open or closed" switch connects in circuit with the additional inductor. A sensing and programming means operates to sense at least one lamp operating param- eter to control the proportion of time the switch is open and closed, in order to vary the current input to the lamp. Any of a variety of lamp operating parameters may be sensed in order to control any of a plurality of de- sired lamp operating parameters.
419939
Cooper Industries Inc.
Guertin Fernand
LandOfFree
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