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:
Oct. 12, 2004
Filed:
Dec. 29, 2000
Jari Astala, Tampere, FI;
Nokia Mobile Phones, Ltd., Espoo, FI;
Abstract
The invention relates to a protection circuit ( ) which includes at least one switch (FET , FET ) including at least one control means (G , G ) for adjusting the conductivity of the at least one switch (FET , FET ). The conductivity is arranged to be adjustable by means of an electrical control conducted to the control means (G , G ). The protection circuit ( ) includes means ( ) for forming the electrical control, means ( ) for measuring at least one physical quantity affecting at least one switch (FET , FET ), means ( ) for providing information about the dependence of the conductivity properties of the at least one switch (FET , FET ) on the at least one physical quantity, means ( ) for determining the conductivity of the at least one switch (FET , FET ) on the basis of the at least one physical quantity and the conductivity properties of the at least one switch (FET , FET ) and means ( ) for determining the current (I ) conducted through the at least one switch (FET , FET ) at least partly on the basis of the conductivity. Thus, the electrical control is arranged to be formed at least partly on the basis of the determined current.