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:
Sep. 11, 2001
Filed:
Jun. 16, 2000
Bernard Bedouet, Bourg-les-Valence, FR;
Thomson-CSF Sextant, Velizy Villacoublay, FR;
Abstract
A power supply device (,) for a light box (,) is provided for the backlighting of liquid crystal display screens. The device (201) includes a regulating DC/DC converter (,) of the booster type, powered directly by a 28-volt power supply so as to deliver directly a 50-volt stabilized DC voltage for powering the light box (,). The converter (,) includes an output diode (,) which protects the device. An energy reserve is obtained via a capacitor (,) supplied directly with the 50-volt voltage. A second converter (,) with galvanic isolation provides a set of supply voltages to electronic control cards (,) of display screens illuminated by the light box (,). A link between the light box (,) and the control cards (,) is effected by a galvanic isolation device (,). The device (,) makes it possible to increase the efficiency of the power supply so as to decrease weight, volume and cost thereof.