Widex A/s

Henning Hougaard Andersen

Soren Kilsgaard

Niels Ole Knudsen

In a monitoring device including a reader and a data carrier, the data carrier includes a receiver coil (), a resonator capacitor (), rectifier means (), a modulation capacitor (), an energy storage capacitor (), three modulation switches () and data processing means. The modulation capacitor (), the energy storage capacitor (), the data processing means and the three modulation switches () are arranged such that, in a first configuration, the modulation capacitor () and the energy storage capacitor () are coupled in parallel and, in a second configuration, the modulation capacitor () and the energy storage capacitor () are coupled in series. The invention further provides a method of operating a data carrier in such a monitoring device.

Monitoring device and a method for wireless data and power transmission in a monitoring device

In a monitoring device consisting of a reader and a data carrier, the reader () comprises a control unit (), a memory (), a digital signal generator (), an output driver (), resonance capacitors () and a transmitter coil (). The digital signal generator () is adapted for supplying a digital bit sequence selected among, at least two, bit sequences stored in the memory () whereby the strength of the magnetic field generated by the transmitter coil () can be varied dependent on the bit sequence selected by the control unit (). The invention further provides a method of controlling the strength of a magnetic field generated by the reader of the monitoring device.

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Lynge, Denmark

Henning Hougaard Andersen