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:
Jan. 23, 2007
Filed:
Apr. 07, 2005
Yoshiaki Hachiya, Ohtsu, JP;
Yoshiaki Hachiya, Ohtsu, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
An output signal of an error amplifier, which has a reference terminal to which a voltage having no temperature characteristics fluctuation is applied and which has a detection terminal to which a voltage detecting terminal VOis connected, is transmitted to the control terminal of a switching element. Voltage fluctuation at the voltage detecting terminal VOis output as a current signal by a V-1 conversion circuit constituted by a current mirror circuit having a constant current source, the switching element, and switching elementsandto a detected signal output terminal PC via the error amplifier. The signal is transmitted to the outside by a optical couplerto control a voltage at an output voltage terminal VOUT. A voltage detection circuit, in which a desired voltage is acquired by controlling voltages at terminals supplied with power, exhibiting lower power consumption and improved voltage detection accuracy and a power supply unit having low ripple voltage and a reduced components count are implemented.