Inductive coupling reader comprising means for extracting a power supply voltage
DC CAFCFirst Claim
1. A method for supplying a power supply voltage to a contactless integrated circuit reader that is in a passive operating mode, in the presence of an external alternating magnetic field, the reader comprising an antenna circuit having at least one input terminal, at least one capacitor and an antenna coil having two end terminals, the antenna circuit being substantially tuned to a working frequency and having, as measured with respect to the at least one input terminal and at the working frequency, a first impedance, the method comprising:
- taking off in the antenna circuit an alternating voltage induced in the antenna circuit by the external magnetic field; and
rectifying the alternating voltage to supply an auxiliary supply voltage of the reader.
8 Assignments
Litigations
3 Petitions
Accused Products
Abstract
The present invention relates to a method for supplying a power supply voltage (Vccr) to a contactless integrated circuit reader (RD1) that is in a passive operating mode, in the presence of an external alternating magnetic field (FLD2), the reader comprising an antenna circuit (ACT) substantially tuned to a working frequency (F0). According to the present invention, the method comprises the steps of taking off in the antenna circuit (ACT) an alternating voltage (Vcd) induced in the antenna circuit by the external magnetic field (FLD2), and rectifying the induced voltage to supply an auxiliary supply voltage (Vccr).
18 Citations
30 Claims
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1. A method for supplying a power supply voltage to a contactless integrated circuit reader that is in a passive operating mode, in the presence of an external alternating magnetic field, the reader comprising an antenna circuit having at least one input terminal, at least one capacitor and an antenna coil having two end terminals, the antenna circuit being substantially tuned to a working frequency and having, as measured with respect to the at least one input terminal and at the working frequency, a first impedance, the method comprising:
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taking off in the antenna circuit an alternating voltage induced in the antenna circuit by the external magnetic field; and rectifying the alternating voltage to supply an auxiliary supply voltage of the reader. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An inductive coupling reader having an active operating mode and a passive operating mode, the inductive coupling reader comprising:
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an antenna circuit substantially tuned to a working frequency, the antenna circuit having at least one input terminal, at least one capacitor, and an antenna coil having two end terminals, the capacitor and the coil being chosen so that the antenna circuit is substantially tuned to the working frequency and has, at the working frequency and as measured with respect to the at least one input terminal, a first impedance; an emitter circuit that applies to the input terminal of the antenna circuit, when the reader is in the active operating mode, an excitation signal oscillating at the working frequency, so that the antenna coil emits a magnetic field, and that modulates the excitation signal to send data; and an auxiliary supply circuit coupled to the antenna circuit and configured to supply an auxiliary supply voltage of the reader using an alternating voltage induced in the antenna circuit by an external magnetic field. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A portable electronic device comprising:
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a processor; a rechargeable battery coupled to the processor; and an inductive coupling reader having an active operating mode and a passive operating mode, the inductive coupling reader being coupled to the processor, the inductive coupling reader including; an antenna circuit substantially tuned to a working frequency, the antenna circuit having at least one input terminal, at least one capacitor, and an antenna coil having two end terminals, the capacitor and the coil being chosen so that the antenna circuit is substantially tuned to the working frequency and has, at the working frequency and as measured with respect to the at least one input terminal, a first impedance; an emitter circuit that applies to the input terminal of the antenna circuit, when the reader is in the active operating mode, an excitation signal oscillating at the working frequency, so that the antenna coil emits a magnetic field, and that modulates the excitation signal to send data; and an auxiliary supply circuit coupled to the antenna circuit and configured to supply an auxiliary supply voltage of the reader using an alternating voltage induced in the antenna circuit by an external magnetic field. - View Dependent Claims (30)
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Specification