Contactless communication medium and electronic device using the same
First Claim
1. A contactless communication medium, comprising:
- a coil sensitive to a magnetic field;
a rectifying circuit configured to rectify an alternating power energy generated in the coil;
a smoothing circuit configured to smooth a rectified output outputted from the rectifying circuit to generate a DC voltage;
an output terminal connected to the smoothing circuit;
a voltage detecting circuit configured to compare an output voltage extracted from the output terminal with a reference voltage;
a switch configured to operate in response to an output from the voltage detection circuit and to attenuate the alternating power energy generated in the coil when the output voltage reaches a predetermined value; and
a load connected to the output terminal,wherein an impedance of the load has a value such that the output voltage has a predetermined value when an effective value of the magnetic field applied to the coil is 12 A/m or more.
1 Assignment
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Accused Products
Abstract
A contactless communication medium, includes: a coil sensitive to a magnetic field; a rectifying circuit configured to rectify an alternating power energy generated in the coil; a smoothing circuit configured to smooth a rectified output outputted from the rectifying circuit to generate a DC voltage; an output terminal connected to the smoothing circuit; a voltage detecting circuit configured to compare an output voltage extracted from the output terminal with a reference voltage; a switch configured to operate in response to an output from the voltage detection circuit and to attenuate the alternating power energy generated in the coil when the output voltage reaches a predetermined value; and a load connected to the output terminal, wherein impedance of the load has a value such that the output voltage has a predetermined value when an effective value of the magnetic field applied to the coil is 12 A/m or more.
3 Citations
25 Claims
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1. A contactless communication medium, comprising:
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a coil sensitive to a magnetic field; a rectifying circuit configured to rectify an alternating power energy generated in the coil; a smoothing circuit configured to smooth a rectified output outputted from the rectifying circuit to generate a DC voltage; an output terminal connected to the smoothing circuit; a voltage detecting circuit configured to compare an output voltage extracted from the output terminal with a reference voltage; a switch configured to operate in response to an output from the voltage detection circuit and to attenuate the alternating power energy generated in the coil when the output voltage reaches a predetermined value; and a load connected to the output terminal, wherein an impedance of the load has a value such that the output voltage has a predetermined value when an effective value of the magnetic field applied to the coil is 12 A/m or more. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification