Electric lamp and discharge devices: systems – Current and/or voltage regulation – Regulator in shunt to the load device
Patent
1980-10-07
1984-10-16
Chatmon, Saxfield
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Regulator in shunt to the load device
315DIG2, 315DIG7, 315307, 315308, 315194, 307252P, 307252M, G05F 100, H05B 3700, H05B 3900, H05B 4114
Patent
active
044777485
ABSTRACT:
A thyristor/capacitor inverter bridge energizes the lamp circuit with a high frequency oscillating voltage derived from full-wave rectified line voltage. Lamp current is regulated by a commutation circuit which is synchronized with zero crossings of the thyristor current. When power is first applied, an initialization circuit initiates a time delay to permit lamp warm up and then enables the high frequency inverter to begin energizing the lamp load. A re-strike circuit generates pulses coupled to the commutation circuit to re-start it when the rectified line voltage falls below that which is necessary to sustain oscillation of the inverter. Fault detection circuits are included for detecting faults such as loss of primary power, thyristor over-voltage, and thyristor over-current for taking corrective action, such as inhibiting the inverter and commencing a new initialization sequence. In addition, in the case of thyristor over-current, which may indicate that both power thyristors are conducting at the same time, the power thyristors are commutated. A fault count circuit determines whether a predetermined number of such faults occurs within a preset time, and if so, the system is shut down and manual reset may be required.
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Chatmon Saxfield
Thomas Industries Inc.
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