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:
Apr. 29, 1997
Filed:
Jun. 07, 1995
Applicant:
Inventor:
Saso P Vlahu, Munster, IN (US);
Assignee:
Kollmorgen Corporation, Waltham, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02P / ;
U.S. Cl.
CPC ...
318254 ; 318599 ; 388804 ; 363 41 ;
Abstract
A motor controller operable at a PWM (pulse width modulated) repetition rate above 6,000 Hz. A special saturable transformer with an interwinding capacitance of less than 5 picofarads is used to isolate the electronic control circuits from the power stage. PWM pulses are supplied to the saturable transformer such that the leading and trailing edges of the pulses pass through to a Schmitt trigger circuit which reconstructs the original pulse.