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:
Jan. 12, 1999
Filed:
Feb. 17, 1993
James M Dolan, N. Granby, CT (US);
Frank D Ramirez, Stamford, CT (US);
Robert J Tolmie, Jr, Brookfield, CT (US);
Pitney Bowes Inc., Stamford, CT (US);
Abstract
A board for commutation of a brushless motor having an encoder comprising a plurality of Hall-effect sensors operative for providing commutation information to a motor controller including an output drive section which comprises three high-side power FET's and three low-side power FET's connected to determined stator windings of the brushless motor. A low-side pre-drive circuit is operative to selectively turn on each of the low-side FETs and a high-side pre-drive circuit is operative to selectively turn on each of the high-side FETs. A commutation decode logic circuit is connected to the Hall-effect sensors to receive the commutation position information from the Hall-effect sensors and is connected to the high-side and low-side pre-drive circuits for providing selection signals for selecting the appropriate power FETs for commutating the motor. The board is preferably affixed to the end of the brushless motor. The board may further comprise an overcurrent monitoring and disabling circuit as well as a temperature measurement circuit for measuring the temperature of the board.