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. 03, 2014
Filed:
Oct. 05, 2012
Lear Corporation, Southfield, MI (US);
Charles Francis Weber, Dexter, MI (US);
Lear Corporation, Southfield, MI (US);
Abstract
A circuit for interfacing to a limit switch configured to be closed when a wire connected to the limit switch is relatively hot and configured to be opened when the wire is relatively cold includes an input, an output, and a control portion. The input is configured to receive a pulse width modulated (PWM) signal having a duty cycle with a high pulse and a low pulse. The output is configured to apply the PWM signal to an external transistor associated with the wire, and a control portion. The high pulse actuates heating of the wire when the high pulse is applied to the external transistor. The control portion is configured to cause voltage across the limit switch to be substantially zero, whereby arcing of the limit switch is relatively minimal, when the limit switch closes while the high pulse is being applied to the external transistor.