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How Non-contact Cards Work
Dec 05, 2018

The RF reader sends a set of fixed-frequency electromagnetic waves to the IC card. The card has an LC series resonant circuit whose frequency is the same as the frequency emitted by the reader, so that under the excitation of the electromagnetic wave, the LC resonant circuit generates resonance, thereby making the capacitor There is a charge inside; at the other end of the charge, a single-pass electronic pump is connected to store the charge in the capacitor to another capacitor. When the accumulated charge reaches 2V, the capacitor can be used as a power source for the other. The circuit provides operating voltage to transmit data from the card or accept data from the reader.

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