1. Internal structure
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The RF reader sends a set of fixed frequency electromagnetic waves to the IC card, and there is an LC series resonant circuit in the card, whose frequency is the same as that emitted by the reader, so that under the excitation of the electromagnetic wave, the LC resonant circuit resonates, so that there is a charge in the capacitor.
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At the other end of this charge, there is a single-pass electronic pump, which sends the charge in the capacitor to another capacitor for storage, when the accumulated charge reaches 2V, the capacitor can be used as a power supply to provide working voltage for other circuits, transmitting the data in the card or accepting the data of the reader.
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2. Working principle
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The RF reader sends a set of fixed frequency electromagnetic waves to the IC card, and there is an LC series resonant circuit in the card, whose frequency is the same as that emitted by the reader, so that under the excitation of the electromagnetic wave, the LC resonant circuit resonates, so that there is a charge in the capacitor.
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At the other end of the capacitor, there is a single-pass electronic pump, which sends the charge in the capacitor to another capacitor for storage, when the accumulated charge reaches 2V, the capacitor can be used as a power supply to provide working voltage for other circuits, and send out the data in the card or accept the data of the reader.