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:
Aug. 10, 2004
Filed:
Jan. 02, 2002
Applicant:
Inventors:
Antonio Canova, 52025 Montevarchi, Arezzo, IT;
David Martini, 52028 S. Giovanni Valdarno, Arezzo, IT;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M 7/5387 ; H02P 5/28 ;
U.S. Cl.
CPC ...
H02M 7/5387 ; H02P 5/28 ;
Abstract
A circuit for controlling the power supply voltage of an electric motor includes means for detecting the difference between a mains voltage and a reference voltage, and means for generating alternating correction voltage whose frequency is equal to the frequency of the mains voltage and which is phase-shifted with respect to the mains. The phase shift between the mains voltage and the correction voltage is proportional to the between the mains voltage and the reference voltage, and the correction voltage is added to the mains voltage.