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:
May. 08, 2001
Filed:
Mar. 27, 2000
Takashi Noma, Moriyama, JP;
Yasuyuki Morishima, Kyotanabe, JP;
Abstract
A piezoelectric transformer inverter can suppress ripples generated by the oscillations of a transformer, and can reduce the possibility of occurrence of beats in the inverter. In this piezoelectric transformer inverter, a switching element is disposed at a stage before an inverter circuit driving a discharge tube, and the switching element is switched on and off by switching signals from a chopper-duty control unit. Then, an input voltage is converted into a rectangular-wave voltage having a chopper circuit frequency to be supplied to the inverter circuit, and a frequency of n times a driving frequency of the inverter circuit and a chopper frequency of the chopper circuit are set in such a manner that these two frequencies are not close to each other.