The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 30, 1992
Filed:
Sep. 26, 1990
Gary P Watts, Buffalo Grove, IL (US);
Richard A Johnson, Barrington, IL (US);
WDS, Inc., Oswego, IL (US);
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.