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:
Jun. 23, 2009
Filed:
Feb. 28, 2008
Hideki Agari, Osaka, JP;
Hideki Agari, Osaka, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A disclosed power supply circuit () for receiving an input voltage at an input terminal (VDD), converting the input voltage to an output voltage and outputting the output voltage to a load () connected to an output terminal (OUT), comprises: a power supply circuit unit () for converting the input voltage to a predetermined constant voltage and outputting the converted voltage to the output terminal, the power supply circuit unit operating in accordance with a first control signal (CE); an output current detecting circuit unit () for detecting a current output (iout) from the power supply circuit unit, and outputting a second control signal when the detected current is smaller than a predetermined value i; and an output voltage detecting circuit unit () for detecting a voltage output (Vout) from the power supply circuit unit, and operating while the output current detecting circuit unit outputs the second control signal, the output voltage detecting circuit unit stopping operation of the power supply circuit unit with the first control signal when the detected voltage exceeds a predetermined value Vdet; whereby the output supply voltage detecting circuit unit makes the power supply circuit unit operate when the detected voltage becomes equal to or lower than a predetermined value Vdetthat is lower than the predetermined value Vdet, and thereby the power supply circuit unit performs intermittent operations.