H - Electricity – 05 – B
Patent
H - Electricity
05
B
315/66
H05B 37/02 (2006.01) G05F 1/00 (2006.01)
Patent
CA 1222279
ABSTRACT OF THE DISCLOSURE Improved programming and control device for modified lead ballast for HID lamp. The basic ballast comprises a high reactive transformer and capacitor con- nected intermediate the transformer and lamp. An addi- tional inductor and AC switch connect in parallel with the capacitor and the switch is opened and closed to vary the lamp current to control lamp output. The improved device comprises a parameter measuring means which measures a lamp operating parameter and converts same into output electrical signals. These signals are compared to a reference signal to generate error signals. The error signals are integrated by a capacitor and a potential which is indicative of the integrated signals is slowly developed at one capacitor terminal. A ramp capacitor is charged each half cycle of energizing potential. When the ramp capacitor potential crosses over the potential dis- played at the one terminal of the integrating capacitor, a comparator means generates an output signal. The output signal actuates a gate drive to turn a gate-controlled AC switch "ON", which decreases the current to the lamp for the remainder of the half cycle. When the apparatus is initially energized, the potential at the one terminal of the integrating capacitor never crosses the ramp capacitor potential so that the device initially is inoperative. The potential at the the integrating capacitor terminal is then slowly changed by the integrated error signals to reflect the magnitude of the integrated error signals. 36 Thus, the improved device is not effective until the lamp is normally operating.
450331
Cooper Industries Inc.
Ridout & Maybee Llp
LandOfFree
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