Electric lamp and discharge devices: systems – Periodic switch in the supply circuit – Periodic switch in the primary circuit of the supply...
Patent
1990-09-26
1992-06-30
LaRoche, Eugene R.
Electric lamp and discharge devices: systems
Periodic switch in the supply circuit
Periodic switch in the primary circuit of the supply...
315DIG4, 315DIG7, H05B 3702
Patent
active
051266377
ABSTRACT:
A luminous power supply apparatus for driving gas discharge devices and the like with relatively high frequency voltages including an output transformer having a primary winding and a secondary winding across which a device to be powered may be connected, transistorized switches connected to the primary winding for providing pulses of alternating polarity thereto when driving, a pulse width modulator for driving the switches at an RF frequency, and a controller for selecting the width of the drive pulses to control the power applied to the device to be powered. The output transformer is comprised of: a pair of U-shaped core members having their corresponding ends joined together to form a unitary core; a primary winding wound about one side of the core and overlying a first junction of the pair of core members; a secondary winding wound about an opposite side of the core and overlying a second junction of the pair of core members; and potting means having a coefficient of resistance of 3.2 or less disposed about the secondary winding to inhibit power loss due to RF leakage from the secondary winding to a relative ground plane.
REFERENCES:
patent: 3155875 (1964-11-01), Wenrich
patent: 4392085 (1983-07-01), Knoll
patent: 4700147 (1987-10-01), Roccucci
patent: 4717863 (1988-01-01), Zeiler
patent: 4791338 (1988-12-01), Dean
patent: 4920302 (1990-04-01), Konopka
patent: 4950959 (1990-08-01), Beckrot
patent: 4980611 (1990-12-01), Orenstein
patent: 5001386 (1991-03-01), Sullivan
Johnson Richard A.
Watts Gary P.
LaRoche Eugene R.
WDS, Inc.
Zarabian Amir
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