Patent
Contactless communication system for exchanging data
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TLDR
In this paper, the authors describe a remotely powered electric circuit including a coil for picking up the modulated magnetic field from the terminal or for responding by producing modulated disturbance of the magnetic field; a converter including a rectifier stage and a filter stage transforming the magnetic fields picked up by the coil into a DC power supply voltage; and a data transmitter/receiver, the receiver including a demodulator for demodulating the amplitude of the signal picked up, operating on the signal output by the rectifier and filter stages.Abstract:
The terminal includes a coil co-operating with a data transmitter/receiver. The portable object includes a remotely powered electric circuit including: a coil for picking up the modulated magnetic field from the terminal or for responding by producing modulated disturbance of the magnetic field; a converter including a rectifier stage and a filter stage transforming the magnetic field picked up by the coil into a DC power supply voltage; and a data transmitter/receiver, the receiver including a demodulator for demodulating the amplitude of the signal picked up by the coil, the amplitude demodulator operating on the signal output by the rectifier and filter stages. Each of the coils forms a portion of a tuned resonant circuit radiating the field in free space. The amplitude modulation is a low depth modulation, with a modulation ratio that is typically less than or equal to 50%.read more
Citations
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Adaptive inductive power supply with communication
TL;DR: In this article, an adaptive inductive ballast is provided with the capability to communicate with a remote device powered by the ballast, which can change its operating characteristics based upon information received from the remote device.
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TL;DR: In this paper, the authors proposed a method and apparatus for providing power to e.g., a chargeable device via a radio frequency link, which comprises generating a substantially unmodulated signal.
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Nigel P. Cook,Richard C. Levine +1 more
TL;DR: In this article, a method and system for providing power to a chargeable device via radio frequency link is presented, in which a substantially unmodulated radio frequency (RP) signal is transmitted to the device via a transmit antenna.
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References
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Patent
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TL;DR: In this paper, a transducer and an interrogator device is disclosed in which the interrogator provides power and information to the transducers via a magnetic field, which can be modulated in such a manner as to provide identification, commands, or other information without substantially reducing the power transferred to the passive actuators.
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