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. 07, 1994
Filed:
Feb. 17, 1993
Frank D Ramirez, Stamford, CT (US);
Pitney Bowes Inc., Stamford, CT (US);
Abstract
A programmable logic device for commutating a brushless motor having an encoder with a plurality of Hall-effect sensors operative for providing commutation information to a motor controller for commutation of the motor by sequencing of a plurality of complementary FET's for energizing stator windings of the brushless motor comprises a Hall-effect sensor decode circuit and a deadtime generator. The sensor decode circuit is operative for commutation of motor output control signals in accordance with direction and PWM signals from a system controller and commutation information from the Hall-effect sensors. The deadtime generator provides timed blanking for ensuring that each respective one of said plurality of FET's is turned completely off before its complementary FET is turned on to protect against destructive currents.