Non-contact power feeding device used in torque sensor having a coil enclosed in peripheral side of a resonance coil and is magnetically coupled with the resonance coil
First Claim
1. A non-contact power-feeding device, comprising:
- a power transmitting unit that includes a first antenna coil, an oscillator and a driver that enables generation of an AC magnetic field via the first antenna coil based upon a signal provided by the oscillator;
a power receiving unit that includes a second antenna coil that is magnetically coupled with the first antenna coil; and
a torque measuring strain gauge engaged in operation on power provided by the power circuit, wherein;
the first antenna coil comprises;
a flat-plane spiral resonance coil wound with a plurality of turns; and
a flat-plane spiral power-feeding coil that is wound with a plurality of turns outward relative to the resonance coil so as to surround the resonance coil, and is magnetically coupled with the resonance coil, whereinthe power receiving unit further includes;
a rectifier circuit that rectifies an AC signal induced at the second antenna coil;
a power circuit, with an output of the rectifier circuit input thereto via a low pass filter, which outputs power at a predetermined voltage;
a load modulating circuit connected at a connecting point where the rectifier circuit and the low pass filter are connected, which allows data to be transmitted to the power transmitting unit by altering power receiving-side impedance; and
the load modulating circuit changes the power receiving-side impedance based upon strain data detected via the torque measuring strain gauge.
2 Assignments
0 Petitions
Accused Products
Abstract
A non-contact power-feeding device comprises: a power transmitting unit that includes a first antenna coil, an oscillator and a driver that enables generation of an AC magnetic field via the first antenna coil based upon a signal provided by the oscillator; and a power receiving unit that includes a second antenna coil that is magnetically coupled with the first antenna coil, wherein the first antenna coil comprises: a flat-plane spiral resonance coil wound with a plurality of turns; and a flat-plane spiral power-feeding coil that is wound with a plurality of turns outward relative to the resonance coil so as to surround the resonance coil, and is magnetically coupled with the resonance coil.
14 Citations
5 Claims
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1. A non-contact power-feeding device, comprising:
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a power transmitting unit that includes a first antenna coil, an oscillator and a driver that enables generation of an AC magnetic field via the first antenna coil based upon a signal provided by the oscillator; a power receiving unit that includes a second antenna coil that is magnetically coupled with the first antenna coil; and a torque measuring strain gauge engaged in operation on power provided by the power circuit, wherein; the first antenna coil comprises; a flat-plane spiral resonance coil wound with a plurality of turns; and a flat-plane spiral power-feeding coil that is wound with a plurality of turns outward relative to the resonance coil so as to surround the resonance coil, and is magnetically coupled with the resonance coil, wherein the power receiving unit further includes; a rectifier circuit that rectifies an AC signal induced at the second antenna coil; a power circuit, with an output of the rectifier circuit input thereto via a low pass filter, which outputs power at a predetermined voltage; a load modulating circuit connected at a connecting point where the rectifier circuit and the low pass filter are connected, which allows data to be transmitted to the power transmitting unit by altering power receiving-side impedance; and the load modulating circuit changes the power receiving-side impedance based upon strain data detected via the torque measuring strain gauge. - View Dependent Claims (2, 3, 4, 5)
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Specification