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:
Nov. 03, 1992
Filed:
Jun. 15, 1990
J Pierre Rigat-Esselin, Tassin la Demi Lune, FR;
Patrick Gerbier, Montluel, FR;
Marc Menvielle, Toulouse, FR;
Rexroth-Sigma, , FR;
Abstract
System for regulating the mean current flowing through a load (1), particularly an electric device controlling the phenomenon to be regulated, from initial variable control information (.alpha.), a DC voltage source (V.sub.alim) being provided for supplying this load, comprising: a measuring device (4) for permanently measuring the value of the variable information (.alpha.); a determination device (5, 6) for causing a mean theoretical current value to be applied to the load (1) to correspond to each value of the information (.alpha.); a further measuring device (7) for measuring the real DC voltage supplied by the supply voltage source; a computing device (8) for computing, from the determined value of the mean theoretical current and the measured value of the DC supply voltage, a theoretical value of the cyclic ratio (pwm) of a pre-determined fixed frequency square wave voltage signal; a generator (2) for generating a fixed frequency square wave voltage signal having the computed cyclic ratio, this signal being applied to the load; another measuring device (10) for measuring the real mean current flowing through the load; a comparator (11) for comparing the values of the real and theoretical mean currents and generating an error signal (.epsilon.); and a correcting device (9) for correcting the theoretical value of the cyclic ratio as a function of the error signal.