The IC card refers to an integrated circuit card, and a general bus card is a kind of IC card. Generally, a common IC card uses radio frequency technology to communicate with an IC card reader. The IC card stores information by the integrated circuit in the card, and the magnetic card records information by the magnetic force in the card.
The working principle is that the RF reader sends a set of electromagnetic waves of fixed frequency to the IC card. There is an LC series resonance circuit in the card, which has the same frequency as the frequency emitted by the reader. In this way, the LC resonance circuit generates resonance under the excitation of electromagnetic waves , So that there is a charge in the capacitor.
At the other end of this capacitor, a unidirectional electronic pump is connected to send the charge in the capacitor to another capacitor for storage. When the accumulated charge reaches 2V, this capacitor can be used as a power supply to provide working voltage for other circuits. Transmit the data in the card or accept the data from the reader.
RFID technology is a communication technology that can identify specific targets and read and write related data through radio signals, without the need to establish mechanical or optical contact between the identification system and the specific targets.
The basic working principle of RFID technology is that after the tag enters the magnetic field, it receives the radio frequency signal from the reader, and uses the energy obtained by the induced current to send out the product information stored in the chip.Or the tag actively sends a signal of a certain frequency, and the reader reads the information and decodes it, and then sends it to the central information system for data processing.
A complete RFID system is composed of a reader, an electronic tag and an application software system. The Reader transmits radio frequency energy of a specific frequency to the Transponder, which is used to drive the Transponder circuit to send out the internal data. At this time, the Reader sequentially receives the decoded data and sends it to the application for corresponding processing.
In terms of the communication and energy induction methods between RFID card readers and RFID credit card, it can be roughly divided into two types: inductive coupling and backscatter coupling. Generally, the low-frequency RFID mostly adopts the first type, and the higher frequency mostly adopts the second type.
Depending on the structure and technology used, the reader can be a reading or reading / writing device, and it is an RFID system information control and processing center. The reader usually consists of a coupling module, a transceiver module, a control module and an interface unit.
The reader and transponder generally use half-duplex communication to exchange information. At the same time, the reader provides energy and timing to the passive transponder through coupling. In practical applications, management functions such as collection, processing, and remote transmission of object identification information can be further realized through Ethernet or WLAN.
The transponder is the information carrier of the RFID system. At present, most of the transponders are passive units composed of coupling elements and microchips.
Tag: Mifare Ultralight Card ; RFID Credit Card ; RFID Electronic Tag ; RFID Credit Card ; RFID Reader Writer