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. 21, 1989
Filed:
Oct. 07, 1988
Applicant:
Inventors:
Roberto Gariboldi, Lacchiarella, IT;
Alberto Gola, Broni, IT;
Assignee:
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02M / ; H02H / ;
U.S. Cl.
CPC ...
323222 ; 323285 ; 361 91 ; 361111 ; 361 18 ;
Abstract
A circuit for limiting the transient overvoltage across a power transistor connected in series with an inductive load between a supply rail and a ground rail of the circuit and operated to switch ON-OFF the inductive load utilizes a comparator circuit for switching-ON again the power transistor in order to discharge the energy stored in the load's inductance. The voltage across the power transistor is sensed by a first voltage divider, while a reference voltage is obtained by a second voltage divider connected between the supply and ground. The circuit is practically insensitive to temperature and to variations of the supply voltage and is easily implemented.