Electric lamp and discharge devices: systems – Current and/or voltage regulation – Automatic regulation
Patent
1978-09-11
1980-05-20
Moore, David K.
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Automatic regulation
307265, 307269, 315307, H04B 3902
Patent
active
042041414
ABSTRACT:
A circuit for providing a dc pulse, such as to a gated semiconductor for at least partial bypass of a ballast element connected to an HID lamp, the pulse being developed within a time range of an associated ac voltage. A first timer operably connected to the ac voltage produces a first dc output pulse and a second timer connected to the output of the first timer produces the circuit dc pulse output. Reduction of a threshold control voltage of the first timer permits a time constant network connected thereto to advance the conclusion of the output of the first timer forward within its operational range. A time constant network connected to the second timer has charge current added to it from the first timer control voltage, the amount of such current decreasing with an advance positioning of the output of the first timer, thereby increasing the slope of the charge-up voltage of the second time constant network and shortening of the related square wave or dc pulse output from the second timer.
REFERENCES:
patent: 3467838 (1969-09-01), Glazebrook et al.
patent: 3602743 (1971-08-01), Shazo Jr.
patent: 3816794 (1974-06-01), Snyder
patent: 3894265 (1975-07-01), Holmes et al.
patent: 3991343 (1976-11-01), Delpy
Esquire, Inc.
Moore David K.
Vaden III Frank S.
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