What is the working principle of NFC smart lock? NFC door lock technology principle introduction. As described in the previous article on this site, NFC is a short-range high-frequency wireless communication technology and is often used in near-field payment and access control electronic locks. This article mainly introduces its workflow and explains the technical principles. The NFC smart door lock can realize non-contact and non-operational unlocking. This technology greatly improves the operation of the electronic lock and makes unlocking more convenient and quick.
NFC technology is a more advanced solution for electronic door locks. The carrier frequency band is 13.56MHz, and the wavelength is about 20 meters. It is a shortwave band. Non-contact point-to-point data transmission between electronic devices with conditions can be realized, and a more secure data exchange process can be performed.
To understand the working principle of the NFC lock, first look at the working mode of the NFC terminal:
Active mode: In the active mode, the NFC device can act as a reader to issue RF signals to identify and read and write other NFC device information.
Passive mode: The NFC terminal has the function of being read and written information. It only responds passively in the RF field emitted by other devices and is read/written.
Two-way mode: In point-to-point communication mode, two NFC devices are simultaneously in active mode.
NFC smart locks are bidirectional transmission modes that recognize each other and transmit signals to each other.
The principle of NFC technology is to use the principle of near-field infinite communication technology, and the core lies in the mutual coupling of inductors. Therefore, the working process and principle of NFC smart locks are not much different from those of proximity card locks. Similar to a transformer. A user who has detached some RFID magnetic cards may know that the card has a coil inside, similar to the secondary coil of the inductor.
The specific principle flow is as follows:
1. In NFC door locks, mobile phones and card readers have built-in inductive coils. When the mobile phone is close to the smart lock, the door lock acts as a card reader. The inductive coupling coil inside the reader is similar to the transformer primary coil.
2. In this case, the inductive coil of the mobile phone is equivalent to the secondary coil of the transformer. The mobile phone modulates the internal storage information in the coil. The modulation process changes the impedance of the coil regularly, so that the load of the primary coil of the inductor is regularly adapted.
3 door lock reader by detecting the impedance of the internal inductance coil and change the law, you can read out the stored information in the phone, the frequency of the two coincide, to achieve the unlocking step.
The NFC door lock has the steps of the owner to directly unlock the door, and the process of unlocking the guest authorized by the owner. The step of unlocking the guest authorized by the host includes the steps that the owner authorizes the guest and the steps that authorize the guest to unlock.
The common design of the NFC smart lock is based on the NFC-enabled Andriod mobile phone unlock the door, so it needs to meet the hardware conditions:
Smart phone, access control system (built-in NFC signal receiving module, signal processing module, storage module) supporting NFC technology, Android mobile phone supporting NFC module, matching mobile phone APP, electromagnetic lock.
NFC smart uses the NFC module to complete the communication process between the mobile phone and the door lock system, eliminating the need for a mechanical key and eliminating unnecessary troubles such as carrying keys and door cards.
The NFC door lock also has a mobile phone dynamic authorization function. Two mobile phones equipped with APPs (requires NFC function) are required to authorize unlocking of other users. Even if the owner is not at home, they can do so without delay.
NFC technology has been successfully applied to payment scenes, door lock scenes, etc. Recently, the popular shared bicycle lock has also adopted this technology.
The above content is organized by smart lock China Net, more intelligent lock technology, please pay attention to this site!
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