Access card reader coil
Access control card reader coil characteristics:
The hollow inductor coil structure is simple and reliable, only automatic winding machine, artificial mucosa, high inductance precision, small distributed capacitance, high self-resonant frequency, small temperature coefficient, good stability, strong anti-interference ability, is a high frequency application of inductors. Smart card reader coil can be used as current transformer, which has the characteristics of wide band, small size, light weight, easy digital measurement and microcomputer protection.
The basic principle is that the RF reader sends a set of fixed frequency electromagnetic waves to the IC card, and there is an IC series resonant circuit in the card, whose frequency is the same as that emitted by the reader, so that under the electromagnetic wave excitation, the LC resonant circuit resonates, so that there is a charge in the capacitor; 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. The punch card equipment produced by the access control card reader coil is mainly used in the access control system, ID card system, bus card system, attendance system, security system, etc.
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