Voltage and power limiter for an electromagnetic transponder

摘要

An electromagnetic transponder including a resonant circuit; a rectifying bridge having input terminals connected across the resonant circuit and having rectified output terminals providing an electronic circuit power supply voltage; and a device for limiting the voltage across the resonant circuit, connected between the input terminals of the rectifying bridge.

主权项

1. An electromagnetic transponder comprising:
a resonant circuit; a rectifying bridge having input terminals electrically coupled across the resonant circuit and having rectified output terminals configured to provide a voltage for powering an electronic circuit; and a limiter configure to limit a voltage across the resonant circuit, electrically coupled between the input terminals of the rectifying bridge, wherein the limiter includes a detection circuit configured to compare the voltage across the resonant circuit with a threshold that is adjustable between first and second values, the second value being greater than the first value.