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:
Dec. 29, 2015
Filed:
Oct. 23, 2012
Panasonic Corporation, Osaka, JP;
Abstract
A power supply circuit () including: rectifying and smoothing circuit (); transistor (switching element) () connected to an output terminal of the rectifying and smoothing circuit (); transformer (TF) including primary coil (L) connected to the transistor () and secondary coil (L) magnetically coupled with the primary coil (L); current detector circuit () detecting current flowing through the transistor (), and outputting voltage corresponding to the current; voltage output circuit () outputting, while the transistor () is in a turned-on state, voltage dependent on voltage induced by the secondary coil (L); and on-off control circuit () turning off the transistor () when absolute value (Vbe) of a difference between the voltage from the current detector circuit () and the voltage from the voltage output circuit () is no smaller than threshold voltage (Von), and turning on the transistor () when the absolute value (Vbe) is smaller than the threshold voltage (Von).