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:
Sep. 18, 2007
Filed:
Mar. 06, 2003
Masaaki Shimada, Saitama, JP;
Tomoyasu Yamada, Saitama, JP;
Keiichi Sekiguchi, Saitama, JP;
Sanken Electric Co., Ltd., , JP;
Abstract
An AC voltage generated by an AC power sourceis rectified by a full-wave rectifying circuit, which generates a rectified voltage. An internal regulatorperforms waveform shaping of the rectified voltage. A comparatorcompares the rectified voltage output from the internal regulatorwith a reference voltage Vand detects a period in which the rectified voltage exceeds the reference voltage V. According to an output signal of the comparator, a determination signal generation circuitdetermines the power source voltage supplied form the AC power sourceand generates a determination signal. Accordingly, there is no need of a capacitor, etc. for detecting the peak value of the rectified voltage, and it is possible to reduce the size and cost of an AC voltage detection circuit.