Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1984-06-05
1985-03-05
Dixon, Harold
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315208, 315239, 315276, 315283, 315291, 315307, 315DIG4, G05F 100, H05B 3702
Patent
active
045033641
ABSTRACT:
Improved programming and control device for modified lead ballast for HID lamp. The basic ballast comprises a high reactive transformer and capacitor connected intermediate the transformer and lamp. An additional 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 displayed 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 integrating capacitor terminal is then slowly changed by the integrated error signals to reflect to magnitude of the integrated error signals. Thus, the improved device is not effective until the lamp is normally operating.
REFERENCES:
patent: 3265930 (1966-08-01), Powell
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patent: 3590316 (1971-06-01), Engel et al.
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patent: 4204141 (1980-05-01), Nuver
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"Modern Techniques of Analog Multiplications", by Tom Cate, Electronic Engineer, Apr., 1970, pp. 75-79.
Cooper Industries Inc.
Dixon Harold
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