Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1978-09-22
1979-10-09
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
315205, 315208, 315224, 315287, 315DIG7, H05B 4138, G05F 108
Patent
active
041707478
ABSTRACT:
A dimmer circuit for an HID lamp is provided for supplying a square wave current therethrough at a constant frequency, but whose duty cycle is variable dependent on a sensed current level. The circuit employs a first pair of transistor switches for reversing polarity through the lamp at a low frequency rate. Associated with each of those transistors is a circuit having a transistor switch connected to a drive circuit employing a timer network. The timer network produces an output that is a square wave, the leading edge of which occurs at regular intervals at a high frequency rate. The trailing edge occurs dependent on a dim/bright voltage setting and upon the amount of current through a sensing resistor in series with the lamp.
REFERENCES:
patent: 3648106 (1972-03-01), Engel et al.
patent: 3707648 (1972-12-01), Rosa
patent: 3816794 (1974-06-01), Snyder
patent: 3894265 (1975-07-01), Holmes et al.
patent: 3969652 (1976-07-01), Herzog
patent: 3999100 (1976-12-01), Dendy et al.
patent: 4041367 (1977-08-01), Gold et al.
patent: 4053813 (1977-10-01), Kornrumpf et al.
Esquire, Inc.
LaRoche Eugene R.
Vaden III Frank S.
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