The card driver sends the fixed electromagnetic wave component to the contactless IC card, which contains the same serial LC resonant circuit as the card driver. Under the electromagnetic pulse, the LC resonant circuit produces resonance, which leads to the charge in the capacitor. When the charge reaches 2V, the capacitor can be used as a power supply to supply power to other circuits to the operating voltage, to transmit data from the card to the outside, or to access the card reader data.<br>
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