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:
May. 26, 2000
Koji Umetsu, Miyagi, JP;
Masato Ishigaki, Miyagi, JP;
Sony Corporation, Tokyo, JP;
Abstract
A power unit is provided that is not affected by a voltage fluctuation of a reverse flow-preventive diode provided in an output line thereof and that can provide a stable output controlled with a high accuracy. A first rectified diode,rectified and a first smoothing capacitor,smoothes the voltage switched by a transformer,to generate a DC voltage (V,) at an A point. A reverse flow-preventive diode,and an output resistor,are provided between the A point and a positive output terminal,The comparison/detection circuit,compares the anode and cathode potentials of the reverse flow-preventive diode,with each other. The comparison/detection circuit,supplies a differential amplifier,the anode or cathode potential whichever is lower.