RFID low-power-consumption label detection circuit

Abstract

The invention discloses an RFID low-power-consumption label detection circuit, which comprises a transmitting circuit, a receiving filter circuit, an 8-bit AD circuit and a label detection logic circuit, and is characterized in that the transmitting circuit comprises an internal clock circuit and two driving circuits; under the control of the label detection logic circuit, when a label needs to be detected, an internal clock circuit is enabled to generate a 13.56 MHz clock; the receiving filter circuit is composed of a sampling follower circuit and an active filter circuit, and two differential inputs are connected through an external coil and are connected to the sampling follower circuit; the 8-bit AD circuit is composed of a comparator, a 8-bit DA module and an AD control unit. The label detection logic circuit comprises a timer and a digital comparator. By setting the counting time of the timer, the whole label detection system is started at fixed time, and enabling control signals of the transmitting circuit, the receiving filter circuit and the 8-bit AD circuit are generated. According to the invention, whether the RFID system is started or not is determined by judging whether the tag card receives energy or not, so that unnecessary starting can be reduced, and the effect of reducing power consumption is achieved.

Description

technical field [0001] The invention relates to the technical field of RFID radio frequency, and to be precise is a low power consumption label detection circuit of RFID. Background technique [0002] The power consumption of the RFID radio frequency identification system is relatively large, and can even reach hundreds of watts. In order to reduce power consumption in the application, the method of regularly interrupting wake-up is generally used. Start the RFID radio frequency identification system through the software and send the communication signal. If the feedback signal from the tag card is received, the RFID radio frequency communication device continues to communicate with the tag card. If no signal feedback from the tag card is received, the RFID radio frequency communication device stops working to save power consumption. [0003] For example, Patent Application No. 202011468165.3 discloses a low-power consumption RFID reading and writing system and method, wh...

AI Technical Summary

Problems solved by technology

[0004] This traditional method needs to start modules such as RFID radio frequency communication equipment and CPU every time, which cannot meet the demand for low power consumption in today's increasing lithium battery-powered applications.

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