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:
Dec. 10, 2019
Filed:
Nov. 16, 2016
Rohm Co., Ltd., Kyoto, JP;
Tatsuya Iwasaki, Kyoto, JP;
Takeshi Nozawa, Kyoto, JP;
Isao Yamamoto, Kyoto, JP;
Kazuyoshi Yasuoka, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
A rectifier circuit includes an H-bridge circuit, and rectifies an AC current that flows through a reception antenna. A smoothing capacitor smoothes the output of the rectifier circuit. A demodulator demodulates an FSK-modulated electric power signal. A first comparator compares a voltage Vat a first AC input terminal with a first threshold voltage V, and generates a first detection signal. A second comparator compares a voltage Vat a second AC input terminal with a second threshold voltage V, and generates a second detection signal. A clock generating circuit generates a frequency detection clock CLK_OUT that transits according to a predetermined edge type of the first detection signal and a predetermined edge type of the second detection signal. A frequency detection circuit detects the frequency of the frequency detection clock.