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:
Mar. 16, 1999
Filed:
Aug. 20, 1997
Tsuyoshi Masato, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
An arbitrary input AC voltage is applied from an external power supply (1) to a rectifying circuit (2), and one rectifying output end of the rectifying circuit is connected to a switching element (4) through a coil (3), while the other rectifying output end of the rectifying circuit is connected to a common terminal of the switching element through a detecting circuit (5) for a current waveform. Further, a peak value wave detecting circuit formed of a diode (6) and a capacitor (7) is connected in parallel with the switching element (4) so that a step-up chopper circuit is formed. A detecting circuit (10) for an output voltage having two resistors (9a), (9b) is connected between both ends of this capacitor (7). The one rectifying output end of the rectifying circuit (2) is connected to a detecting circuit (11) for an effective voltage value, and the two resistors (9a), (9b) for detecting the output voltage of the detecting circuit (10) are selected by a detecting signal of the detecting circuit (11). The detecting signals of these detecting circuits (5), (10), (11) are supplied to a control block (12) for controlling turning-on and turning-off timings of the switching element (4).