Active RFID system with wireless charging function

Abstract

The invention discloses an active RFID system with a wireless charging function. The active RFID system comprises a reader and an active tag, the active tag comprises two modes: a sleep mode and a working mode. When the active tag is in a sleep mode, the switch is switched to a receiving path, the awakening receiver circuit and the energy collection circuit work at the same time, the awakening receiver circuit detects awakening signal energy in a free space, and the energy collection circuit rectifies and converts free electromagnetic energy in air into direct current to be stored in the button cell. When the wake-up circuit end monitors the wake-up semaphore of modulated information, the active tag changes the working state, the switch is switched to the working mode, and at the moment, the radio frequency IC of the active tag sends radio frequency data information to the reader end for data information transmission. Through wireless charging and low-power-consumption design, the service cycle of the active tag is effectively prolonged, and the system is simple in overall structure, small in size, low in cost and good in adaptability in a complex electromagnetic environment.

Description

technical field [0001] The invention belongs to the technical field of radio frequency communication and short-range detection, in particular to an active RFID system with wireless charging. Background technique [0002] Radio frequency identification technology, also known as RFID, uses radio frequency signals to radiate and couple in free space to realize medium and long-distance non-contact transmission of data information. As a means of information transmission, it is convenient for electronic data storage and data transmission. Features, as well as security during transmission, are widely used in public transportation systems such as subways and buses, retail enterprises, personal identification, logistics management, etc. in every corner of life, and are considered to be the ten most promising technologies in the 21st century one. It has better practicability and adaptability to use active RFID tags in daily life. In some complex electromagnetic wave environments and...

AI Technical Summary

Problems solved by technology

In the article "A low power-long range active RFID-system consisting of active RFIDbackscatter transponders", scholar Emil Nilsson combined the binary tree algorithm to allocate the amount of identified identity information, and represented the corresponding digital information by dividing different channel frequencies. Because a large number of tags exchange information with the reader at the same time, the overall power consumption of multiple tags is reduced, and the delay is low at the same time. However, the system itself still uses the method of receiving the RF signal of the reader to trigger the tag to oscillate and feedback the amount of data information, which has low sensitivity and Not easy to transmit over long distances

Dr. Che Wenyi of Fudan University wrote the article "Research and Design of Semi-Active Ultra-high Frequency Identification Tag Chip", which designed a low-power semi-active UHF electronic tag under the SMIC 0.18um EEPROMCOMS process. This kind of tag takes into account high-sensitivity communication, has the function of timing reading temperature, quasi-constant current and constant voltage charging and battery voltage detection function, the sleep current is only 150nA, and the technology can greatly reduce the sleep working current of RFID to reduce the power consumption in the sleep state Loss, this kind of radio frequency identification electronic tag is highly integrated, but the design is relatively difficult, and it is greatly affected by the voltage and temperature characteristics, which is easy to trigger the system to wake up by mistake, resulting in frequent waste of electric energy

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