Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1987-10-08
1989-10-10
Griffin, Robert L.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315307, 315DIG7, H05B 4136
Patent
active
048734713
ABSTRACT:
An electronic frequency inverter circuit receives input electrical power at a lower frequency and energizes a load circuit including gaseous discharge lamps in a range of higher frequencies. First and second semiconductors are operated alternatively by a logic circuit in current mode control such that the switches operate at the high frequency range and the frequency of current in the load circuit varies as the magnitude of said source voltage varies. The load circuit has an impedance which varies with frequency such that the peak amplitude of the load current remains substantially constant despite variations in the magnitude of said source voltage to achieve a desirable crest factor for the lamp current. A high current limit circuit rapidly turns off the switches when excessively high current begins to flow through the switches. Low voltage is supplied in port from the high frequency current. Normal operation is ensured during start-up, for reduced line voltage and for a semiconductor chip embodiment.
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Dean Thomas E.
Fischer David M.
Henrich William H.
Pietsch Herbert E.
Stratton Lawrence J.
Griffin Robert L.
Salindong T.
Thomas Industries Inc.
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