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. 01, 2002
Filed:
Dec. 18, 2000
Gianantonio Pozzato, Vicenza, IT;
Telea Electronic Engineering SRL, Vicenza, IT;
Abstract
The invention realizes a radio knife powered by an electronic circuit that operates with high-frequency current wherein said circuit comprises: a rectifier circuit ( ) fed by the mains voltage that supplies rectified pulsating voltage ( ) to a radiofrequency circuit ( ); a radiofrequency circuit ( ) capable of emitting an output current signal ( ) with a constant frequency in the scale of the MHz, powering the radio knife by means of a radiofrequency transformer ( ). Said radiofrequency circuit ( ) is obtained by piloting a MOSFET ( ) through a pilot circuit ( ) comprising a quartz-operated oscillator whose oscillation frequency amounts to at least twice the usual operating frequency of the MOSFET. The pilot circuit ( ) is controlled by microprocessor current control circuit ( ) that takes a signal proportional to the current from a current sensor ( ) positioned after the MOSFET ( ) and is such as to maintain the radiofrequency circuit current limited to a value compatible with the power that can be dissipated by the MOSFET independently of any variation in the circuit load impedance.