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:
Apr. 20, 1999
Filed:
Aug. 05, 1997
William D Farwell, Thousand Oaks, CA (US);
Manny Tansavatdi, Rancho Palos Verdes, CA (US);
Raytheon Company, Lexington, MA (US);
Abstract
A system for preheating electronic components on a printed wiring board or other interconnecting substrate prior to application of voltage to the components in extreme cold temperature environments. Copper traces are employed as embedded heater elements. A control circuit disables operation of an on-board DC/DC switching converter used to provide power to the electronic components until the board has reached a threshold temperature during a preheating period. Thereafter, the heater operation is synchronized with the operation of the switching converter, such that the temperature can be maintained, yet total power supply current to the board never exceeds a predetermined maximum level.