Importance

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Abstract

A power reception device includes a power reception antenna used for communication and electric power reception; a rectifier circuit connected to the antenna, the rectifier circuit converting into direct current voltage, electric power received by the antenna, and the direct current voltage is output and supplied to a load; a communication section which communicates via the antenna; a switch circuit connected between the antenna and the communication section, wherein the switch circuit is transitable between a conductive state in which the communication section is electrically connected to the antenna and a cut-off state in which the communication section is electrically disconnected from the antenna; and a switch control section connected to the rectifier circuit. The switch control section transitions the switch circuit into the cut-off state when the direct current voltage output from the rectifier circuit exceeds a first threshold in association with start of the electric power reception by the antenna, and the switch control section performs transition of the switch circuit into the conductive state when the direct current voltage falls below a second threshold different from the first threshold. During signal sending by the communication section via the antenna, the switch control section does not transition the switch circuit into the cut-off state even when the direct current voltage output from the rectifier circuit exceeds the first threshold; and during the signal sending by the communication section via the antenna, the switch control section transitions the switch circuit into the cut-off state when the direct current voltage exceeds a third threshold larger than the first threshold.

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First Claim