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:
Oct. 08, 1991
Filed:
Nov. 06, 1989
Wayne T Wiblin, Ashtabula, OH (US);
Arthur Wild, Thompson, OH (US);
Caterpillar Industrial Inc., Mentor, OH (US);
Abstract
An apparatus for dampening current in a coil has a switchable member which controls the current level in the coil and a flyback circuit that allows current in the coil to slowly dissipate when the switchable member changes from an 'ON' to an 'OFF' state. The flyback circuit has a high resistance when the switchable member changes from the 'ON' to the 'OFF' state so that the coil current is dampened as quickly as possible without creating a destructive voltage and low resistance when the switchable member is in the 'ON' state to conserve energy. A signaling device creates a voltage signal as a function of current passing through the flyback circuit and a receiving device varies the resistance of the flyback circuit in response to the voltage signal. The apparatus is particularly suited for use in a motor control circuit.