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:
Jan. 25, 2000
Filed:
Oct. 02, 1998
Timo Vaananen, Kiiminki, FI;
Markku Kallunki, Oulu, FI;
Nokia Mobile Phones Ltd., Espoo, FI;
Abstract
The invention relates to a method and an arrangement for producing an operating voltage of a desired form. A high-voltage operating voltage of a desired form is produced by means of a DC-AC converter. The desired operating voltage is usually a sine voltage. The DC-AC converter is controlled by means of a pulse form control signal of a signal generator, the pulse width of the control signal being controlled by means of a pulse width modulator. To change the pulse width of the control pulses, the operating voltage of a desired form produced by means of the DC-AC converter is compared with a reference signal and a comparator is used for forming a difference signal. The difference signal is used for controlling the pulse width of the control signal of the pulse generator in order to produce the operating voltage of a desired form.