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:
Mar. 09, 1982
Filed:
Sep. 17, 1980
Applicant:
Inventor:
William F Hill, Stafford, GB;
Assignee:
Lucas Industries, Limited, Birmingham, GB;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01H / ;
U.S. Cl.
CPC ...
361152 ; 361154 ;
Abstract
An electromagnet control circuit includes a first switching transistor which is connected in series with the electromagnet across a low voltage supply. A second switching transistor is connected to provide a high voltage supply to the electromagnet at switch-on. An inductor is connected by transistors to the low voltage supply and is supplied with current while the first switching transistor is on. At switch-off a diode interconnecting the electromagnet 10 and the inductor allows the inductor current to be diverted through the electromagnet to provide rapid flux decay in the latter.