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. 13, 2015
Filed:
Mar. 06, 2012
Hisahiro Kamata, Iwanuma, JP;
Hisahiro Kamata, Iwanuma, JP;
RICOH COMPANY, LTD., Tokyo, JP;
Abstract
A high voltage inverter device uses, as an input voltage (Vin), a DC voltage or a voltage composed of a DC component with a pulsating current superposed thereon, switches the input voltage by a switching element (Qsw) to apply an exciting current to an excitation winding (NP) of a resonant transformer () and output an alternating-current high voltage (Vout) from an output winding (NS) of the resonant transformer. An abnormal voltage detection circuit () including a varistor () detects an abnormal voltage generated in the excitation winding (NP) of the resonant transformer (), and when the abnormal voltage is detected, its signal is transmitted by a photocoupler () to a control circuit (), thereby causing the control circuit () to stop its oscillation operation to stop a switching operation of the switching element (Qsw).