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:
Aug. 24, 2021
Filed:
Mar. 07, 2019
Daihen Corporation, Osaka, JP;
Hosei University, Tokyo, JP;
Daihen Corporation, Osaka, JP;
Hosei University, Tokyo, JP;
Abstract
Provide are a power reception device, a wearable device, and a non-contact power feeding system that can improve the transmission efficiency while suppressing upsizing of the circuit thereof. A power reception device () includes a variable capacitance circuit () and a power reception coil () constituting a resonance circuit together with the variable capacitance circuit (), in which the variable capacitance circuit () includes a first capacitor (C) and a second capacitor (C) connected in parallel to each other, a first switch (Tr) connected in series to one end side of the first capacitor (C), and a switch control circuit () that controls turning on and off of the first switch (Tr) and includes a first comparator (OP) that supplies a first control voltage to the first switch (Tr) according to a comparison result between a reference voltage and an AC voltage applied to the second capacitor (C).