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:
Jul. 21, 1998
Filed:
Sep. 25, 1996
Dennis V Hahn, Plano, TX (US);
Texas Instruments Incorporated, Dallas, TX (US);
Abstract
The present invention includes a circuit for detecting a back EMF signal for a motor. The circuit includes a circuit 200 for detecting when the back EMF signal from the motor is either a positive EMF signal or a negative EMF signal, a positive source circuit 302 to supply a positive current, a negative source circuit 304 to supply a negative current, a switch circuit 120 and 122 to connect the positive source circuit to an output circuit 410 of the back EMF signal circuit and to connect the negative source circuit to the output circuit, and the output circuit outputting the positive source current while the positive EMF signal is detected and outputting the negative current while the negative EMF signal is detected.