CN202600746U - Active RFID tag powered by solar energy - Google Patents

Abstract

The technology scheme of the utility model provides an active RFID tag powered by solar energy. The active RFID tag is characterized by comprising an antenna, a solar cell panel, a rechargeable lithium battery, a power amplifier circuit, an up-conversion and band-pass filtering circuit, an ASK reverse modulation circuit, an anti-overshoot protection module, a power supply control module, a low-voltage alarm module, a clock circuit, a voltage real-time monitoring circuit, an envelope generation circuit, a detector circuit, a coding/decoding circuit, a MCU, a memory, a key authentication module and a man-machine interface module. The solar cell is used as a power supply, and the ASK reverse modulation circuit, the up-conversion and band-pass filtering circuit, the power amplifier circuit, the coding/decoding circuit, the key authentication module, the MCU, and the antenna are started by the power supply control module so as to transmit data stored in the memory, or receive data through the antenna, the envelope generation circuit, detector circuit and the MCU and store the data in the memory.

Description

A kind of solar powered active RFID tag

Technical field

The utility model belongs to application of solar, relates to a kind of solar powered active RFID tag.

Background technology

RF identification (RFID) is to utilize wireless radio frequency mode to carry out the noncontact bidirectional data communication; To reach the purpose of Target Recognition and swap data; The RFID label is different according to power supply mode, can distinguish active RFID tag and passive RFID tags, provides electric energy to support the active RFID tag that is called of label work through battery; Need not battery-powered, produce the passive RFID tags that is called that electric energy is supported label work through electromagnetic induction; Active RFID tag is compared advantages such as having decipherment distance is far away, favorable expandability with passive RFID tags; But the lithium battery power supply of active RFID tag also is a big drawback; Traditional active RFID label generally adopts 3.7V high-performance lithium powered battery, and service time is generally about one or two years.Active RFID tag once encapsulates; When the electric weight deficiency occurring; This sheet active RFID tag just can not use; Short, the difficult battery problems of changing of battery-powered time to active RFID tag, we spy has invented solar powered active RFID tag, solves the long-term powerup issue of active RFID tag.

Summary of the invention

The purpose of the utility model provides a kind of solar powered active RFID tag; Gathering sun power through solar panel is electric energy with conversion of solar energy; Store in the built-in chargeable lithium cell of active RFID tag, supply the electric energy that continues for active RFID tag.

The technical scheme that the utility model adopted provides a kind of solar powered active RFID tag; It is characterized in that, produce circuit, detecting circuit, coding-decoding circuit, MCU, storer, key authentication module and human-computer interface module and form by antenna, solar panel, chargeable lithium cell, power amplifier circuit, up-conversion and bandwidth-limited circuit, ASK back-modulation circuit, anti-overshoot protection module, power supply control module, low-voltage alarm module, clock circuit, the real-time observation circuit of voltage, envelope.

Antenna connects power amplifier circuit and envelope produces circuit; Power amplifier circuit connects up-conversion and bandwidth-limited circuit, ASK back-modulation circuit successively up to MCU; Envelope produces circuit and connects detecting circuit up to MCU; Solar panel connects anti-overshoot protection module, chargeable lithium cell and power supply control module successively, and the low-voltage alarm module connects power supply control module, MCU and human-computer interface module, and clock circuit connects MCU, observation circuit connects MCU in real time, coding-decoding circuit connects MCU; Storer connects MCU, and the key authentication module connects MCU.

The characteristic of the utility model also is,

Adopt the design of solar panel and chargeable lithium cell, solve active RFID tag continued power problem.

Solar panel is an electric energy with the transform light energy of gathering, when storing chargeable lithium cell into, and the anti-overshoot protection module protection chargeable lithium cell safety of design.

Low-voltage alarm module, the real-time observation circuit of voltage and human-computer interface module have been designed; When the real-time observation circuit of voltage detects cell voltage and is lower than the magnitude of voltage of regulation; The power light flicker of human-computer interface module, the low-voltage alarm module sends alarm signal and gives MCU.

After MCU received the alerting signal that the low-voltage alarm module sends, it was the chargeable lithium cell charging that the control solar panel begins.

MCU adopts the ST ST12C2052 of company.

Storer adopts the XRAG2 of ST company.

Description of drawings

Accompanying drawing is a kind of solar powered active RFID tag structural representation.

Accompanying drawing 1 description of symbols

The 1-antenna	The 2-solar panel	The 3-chargeable lithium cell
			The 4-power amplifier circuit	5-up-conversion and bandwidth-limited circuit	6-ASK back-modulation circuit
7-prevents the overshoot protection module	The 8-control module of supplying power	9-low-voltage alarm module
			The real-time observation circuit of 10-voltage	The 11-envelope produces circuit	The 12-detecting circuit
The 13-coding-decoding circuit	14-MCU	The 15-storer
			16-key authentication module	The 17-human-computer interface module

Embodiment

Below in conjunction with accompanying drawing and embodiment the utility model is elaborated.

Embodiment

As shown in Figure 1, described a kind of solar powered active RFID tag is produced circuit 11, detecting circuit 12, coding-decoding circuit 13,MCU 14, storer 15, key authentication module 16 and human-computer interface module 17 and is formed by the real-time observation circuit of antenna 1, solar panel 2, chargeable lithium cell 3, power amplifier circuit 4, up-conversion and bandwidth-limited circuit 5, ASK back-modulation circuit 6, anti-overshoot protection module 7, power supply control module 8, low-voltage alarm module 9, voltage 10, envelope.

After antenna 1 receives the ASK am signals, produce circuit 11 through envelope the HFS of ASK am signals is carried out envelope detection, move base band to signal from frequency band, extract ASK am signals envelope.Through behind the envelope detection circuit 12; The radio-frequency component of ASK am signals is carried out bandpass filtering; The thorough filtering of carrier wave, pass through detecting circuit 12 voltage comparators to filtered ASK am signals then, the ASK am signals is reverted to original digital signals format.

During the external back information of electronic tag, the radio frequency interface that the ASK amplitude modulated digital signals after its coding-decoding circuit 13 will be encoded is delivered to ASK back-modulation circuit 6 carries out the ASK back-modulation by modulation circuit.Back-modulation adopts the load-modulate mode; Promptly change the power of sending signal amplitude through the size that changes antenna 1 load; Digital signal is inserted a nonlinear element circuit; The variation of its high-low level can be controlled shunt load and in circuit, be switched on or switched off, thereby the size that changes antenna 1 load is carried out which amplitude modulation.After converting digital signal into the ASK am signals; Through up-conversion and bandwidth-limited circuit 5; Signal is moved frequency band by base band; ASK amplitude modulation(PAM) high-frequency signal power after the modulation is less, through power amplifier circuit 4, externally sends delivering to antenna 1 again after the amplification of ASK amplitude modulation(PAM) high-frequency signal signal power.

Solar panel 2 converts sun power into electric energy, through anti-overshoot protection module 7, anti-overshoot protection module judge not can the overshoot electric energy after, with power storage in chargeable lithium cell 3.When judging meeting overshoot electric energy, cut off electric energy and supply with chargeable lithium cell 3, prevent the damage of chargeable lithium cell 3.

After the real-time observation circuit 10 detection cell voltages of voltage are lower than the magnitude of voltage of regulation, the power light flicker of human-computer interface module 17, low-voltage alarm module 9 sends alarm signal and givesMCU 14.

Readable the writing of built-in information of storer 15 stored.

Key authentication module 16 judges whether the request signal that sends is consistent with key algorithm, and is consistent just through authentication, and hands overMCU 14 to handle, otherwise just refuses this request signal.

Claims (2)

1. solar powered active RFID tag; It is characterized in that; Produce circuit, detecting circuit, coding-decoding circuit, MCU, storer, key authentication module and human-computer interface module and form by antenna, solar panel, chargeable lithium cell, power amplifier circuit, up-conversion and bandwidth-limited circuit, ASK back-modulation circuit, anti-overshoot protection module, power supply control module, low-voltage alarm module, the real-time observation circuit of voltage, envelope

Solar panel is an electric energy with the transform light energy of gathering, when storing chargeable lithium cell into, and the anti-overshoot protection module protection chargeable lithium cell safety of design,

Described low-voltage alarm module, the real-time observation circuit of voltage and human-computer interface module; It is characterized in that, after the real-time observation circuit detection of voltage cell voltage is lower than the magnitude of voltage of regulation, the power light flicker of human-computer interface module; The low-voltage alarm module sends alarm signal and gives MCU

After described low-voltage alarm module and MCU, MCU received the alerting signal that the low-voltage alarm module sends, it was the chargeable lithium cell charging that the control solar panel begins.

2. a kind of solar powered active RFID tag according to claim 1 is characterized in that, storer adopts the ST XRAG2 of company.

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