Passive RFID tag utilizing visible light communication

Abstract

The invention provides a passive RFID tag utilizing visible light communication, which comprises an optical receiver, a decision circuit, a digital baseband, a numerical control switch, an RF backscattering modulation circuit and a power supply management circuit, wherein the optical receiver, the decision circuit, the digital baseband, the numerical control switch and the RF backscattering modulation circuit are sequentially connected, the digital baseband is further connected with a storage, the power supply management circuit is used for providing a stable supply voltage to the optical receiver, the decision circuit, the digital baseband, the storage, the numerical control switch and the RF backscattering modulation circuit, an output end of the RF backscattering modulation circuit is connected with an RF antenna, a power supply input end of the power supply management circuit is connected with a photocell, and an output end of the photocell is further connected with the optical receiver through a capacitor. According to the Passive RFID tag, a light source of an optical communication transmitter is used for providing energy to the tag, and the defect of being harmful to human body due to large electromagnetic radiation of the ordinary passive RF tag is effectively overcome; the emitter adopts RF backscattering modulation and the RF antenna, and the defects that the power consumption of the emitter in visible light communication is high and LED is hard to integrate can be overcome; and the overall power consumption of the tag is further reduced, and the chip integration of the tag is improved.

Description

technical field [0001] The invention relates to a radio frequency identification tag. In particular, it relates to a passive radio frequency identification tag using visible light communication that adopts visible light communication mode for receiving signals and adopts radio frequency backscatter modulation mode for transmitting signals. Background technique [0002] With the development of RFID (Radio Frequency Identification, radio frequency identification) technology, RFID electronic tags are gradually applied to the field of identification technology. RFID electronic tags are mainly composed of three parts: tag chip, reader, data transmission and processing system. RFID electronic tags have the advantages of strong anti-interference ability, large amount of information, non-visual reading and writing, long life and many types. [0003] The above-mentioned existing RFID technology has at least the following shortcomings and deficiencies: 1. Common passive RFID tags req...

AI Technical Summary

Problems solved by technology

[0003] The above-mentioned existing RFID technology has at least the following shortcomings and deficiencies: 1. Common passive RFID tags require a reader with a high transmission power to provide energy for the tags, so common passive RFID tags have large electromagnetic radiation, poor anti-interference ability, and poor security , long-term use is harmful to the human body

2. Due to the above shortcomings, ordinary passive RFID tags can only use 1-2 RFID working frequency bands, and cannot be applied to most RFID working frequency bands

3. Difficult to monolithic integration

The principle of visible light communication can also be used to make passive tags. On the reader side, the light source of the visible light transmitter is used to provide modulated data and energy for the tag, but the tag needs a light-emitting diode (LED) and corresponding The drive circuit consumes a lot of power, which is not conducive to the passive work of the tag

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