Power receiving device and wireless power supply system
First Claim
1. A power receiving device comprising:
- a first antenna configured to form resonant coupling with an antenna of a power supply device and receive first power from the power supply device through the resonant coupling;
a second antenna configured to form electromagnetic induction coupling with the first antenna and receive second power from the first antenna through the electromagnetic induction coupling with the first antenna;
a rectifier circuit configured to generate DC voltage by rectifying AC voltage applied from the power supply device through the first antenna and the second antenna;
a load to which the DC voltage outputted from the rectifier circuit is applied; and
a control circuit configured to generate a signal for controlling whether the DC voltage is generated by the rectifier circuit or not.
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Accused Products
Abstract
Provided is a power receiving device in which supply of power from a power supply device can be stopped while a reduction in Q-value is suppressed. The power receiving device includes a first antenna which forms resonant coupling with an antenna of the power supply device; a second antenna which forms electromagnetic induction coupling with the first antenna; a rectifier circuit including a plurality of switches and performing a first operation or a second operation depending on whether the plurality of switches is ON or OFF, the first operation being an operation in which voltage applied from the second antenna is rectified to be outputted, and the second operation being an operation in which a pair of power supply points is short-circuited; a load to which the voltage is applied; and a control circuit which generates a signal for selecting ON or OFF of the plurality of switches.
58 Citations
14 Claims
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1. A power receiving device comprising:
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a first antenna configured to form resonant coupling with an antenna of a power supply device and receive first power from the power supply device through the resonant coupling; a second antenna configured to form electromagnetic induction coupling with the first antenna and receive second power from the first antenna through the electromagnetic induction coupling with the first antenna; a rectifier circuit configured to generate DC voltage by rectifying AC voltage applied from the power supply device through the first antenna and the second antenna; a load to which the DC voltage outputted from the rectifier circuit is applied; and a control circuit configured to generate a signal for controlling whether the DC voltage is generated by the rectifier circuit or not. - View Dependent Claims (2)
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3. A power receiving device comprising:
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a first antenna configured to form resonant coupling with an antenna of a power supply device and receive first power from the power supply device through the resonant coupling; a second antenna configured to form electromagnetic induction coupling with the first antenna and receive second power from the first antenna through the electromagnetic induction coupling with the first antenna; a rectifier circuit comprising a first switch and a second switch, the rectifier circuit being configured to generate DC voltage by rectifying AC voltage applied from the power supply device through the first antenna and the second antenna; a load to which the DC voltage outputted from the rectifier circuit is applied; and a control circuit configured to control ON or OFF of the first switch and the second switch, wherein the control circuit is configured so that the DC voltage is generated by the rectifier circuit in the case where one of the first switch and the second switch is ON and the other of the first switch and the second switch is OFF, and wherein the control circuit is configured so that the DC voltage is not generated by the rectifier circuit in the case where both of the first switch and the second switch are ON. - View Dependent Claims (4, 5, 6, 7, 8)
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9. A wireless power supply system comprising:
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a power supply device; and a power receiving device, the power receiving device comprising; a first antenna configured to form resonant coupling with an antenna of the power supply device and receive first power from the power supply device through the resonant coupling; a second antenna configured to form electromagnetic induction coupling with the first antenna and receive second power from the first antenna through the electromagnetic induction coupling with the first antenna; a rectifier circuit comprising a first switch and a second switch, the rectifier circuit being configured to generate DC voltage by rectifying AC voltage applied from the power supply device through the first antenna and the second antenna; a load to which the DC voltage outputted from the rectifier circuit is applied; and a control circuit configured to control ON or OFF of the first switch and the second switch, wherein the control circuit is configured so that the DC voltage is generated by the rectifier circuit in the case where one of the first switch and the second switch is ON and the other of the first switch and the second switch is OFF, and wherein the control circuit is configured so that the DC voltage is not generated by the rectifier circuit in the case where both of the first switch and the second switch are ON. - View Dependent Claims (10, 11, 12, 13, 14)
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Specification