CN203838735U - Ultrahigh-frequency RFID read-write module - Google Patents
Ultrahigh-frequency RFID read-write module Download PDFInfo
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- CN203838735U CN203838735U CN201420277246.9U CN201420277246U CN203838735U CN 203838735 U CN203838735 U CN 203838735U CN 201420277246 U CN201420277246 U CN 201420277246U CN 203838735 U CN203838735 U CN 203838735U
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Abstract
The utility model discloses an ultrahigh-frequency RFID read-write module which comprises a power supply management circuit, a core chip, a peripheral circuit, a radio frequency front end circuit and an antenna configuration circuit. The power supply management circuit carried out constant-current control on an input power supply and provides corresponding power supplies to the other circuits. The peripheral circuit comprises an enablement circuit, a crystal oscillation circuit and a phase-locked loop circuit. The radio frequency front end circuit is used for carrying out earlier stage processing on radio-frequency signals emitted from the core chip and outputting the signals to the antenna configuration circuit and carrying out balance-imbalance conversion on radio-frequency signals returned by the antenna configuration circuit and then sending the signals to the core chip. The antenna configuration circuit is used for sending the radio-frequency signals to an antenna and receiving radio-frequency signals returned by the antenna. The ultrahigh-frequency RFID read-write module utilizes modularized design; function modules are realized and connected respectively; the circuits are highly integrated effectively; the circuit design is simplified; the size of the read-write corn module is reduced to the maximum degree; and the application range is wide.
Description
Technical field
The utility model belongs to REID field, relates in particular to a kind of ultrahigh frequency RFID module for reading and writing.
Background technology
Along with ordinary people is more and more to the understanding of RFID technology, the constantly progressive demand of science and technology constantly increases, and all trades and professions also can constantly increase for the demand of big data quantity and recognition speed.Corresponding, along with the invention of technical renovation and new material is found, RFID technology also will welcome development above, cost, data volume are larger, sensitivity is higher, recognition speed is faster, realize functional diversities, the system networking, compatible better of electronic tag, can be embedded into easily in other system use that can be more convenient in all trades and professions.Meanwhile, the development of market application also forces hardware circuit design to miniaturization, low-power consumption, modular future development, and single read write line multi-protocols compatibility and multi reader/writer networking technology are also by the direction that is RFID technology application development.
In the coming years, the application in RFID industry medium-high frequency market will occupy most of market, but the congenital application advantage of ultra-high frequency RFID technology can impel it to make constant progress.During internationally recognized RFID frequency range is divided, the RFID technical characterstic of each frequency range is different all its practical application scenarios.In China, the RFID application model of low frequency and high frequency is relative ripe, and also Ying Jing is applied in a lot of occasions, and ultra-high frequency RFID technology is applied also in stable and rapid development, and its advantage is very obvious, and use scenes is very many.But compare with high frequency, ultra-high frequency RFID technology is started late, develop comparatively slowly, except the promotion of several large projects of railway aspect, the application of other field is extensive not enough.But ultra-high frequency RFID technology has clear superiority at aspects such as decipherment distance, exchanges data speed, antijamming capability, penetrability.Although China's ultrahigh frequency RFID related industry strength a little less than, technical capability is limited relevant, market potential is huge.Believe the variation along with market, the increase of demand, global will emerge in large numbers a collection of enterprise and the research institution that is engaged in ultra-high frequency RFID technology research, still not mature enough ultra-high frequency RFID technology will obtain larger attention and development at present.
In recent years, RFID market development is rapid, and range of application is constantly expanded, and the market demand is increasing, and increasing company drops into wherein.Foreign company, as Motorola etc., has released very ripe RFID product.Although rfid interrogator manufacturer on the market is begun to take shape, still there is the problems such as volume is large, power consumption is large, price is higher.Along with the attention of government department to Internet of Things industry, the domestic demand for RFID product constantly increases.
Utility model content
The utility model, in order to solve technical matters related in background technology, provides a kind of ultrahigh frequency RFID module for reading and writing.
The technical solution of the utility model is: a kind of ultrahigh frequency RFID module for reading and writing, comprise electric power management circuit, acp chip, peripheral circuit, radio-frequency (RF) front-end circuit and antenna configuration circuit, described electric power management circuit is controlled input power current stabilization and is provided corresponding power supply for other circuit, described peripheral circuit comprises enable circuits, crystal oscillating circuit, phase-locked loop circuit, described radio-frequency (RF) front-end circuit is sent to acp chip through processing the radiofrequency signal that outputs to antenna configuration circuit and antenna configuration circuit is returned early stage for the radiofrequency signal that acp chip is emitted after balancedunbalanced conversion, described antenna configuration circuit is for being sent to radiofrequency signal the radiofrequency signal that antenna and receiving antenna return.
In sum, the utlity model has following advantage:
The utility model adopts modular design, each functional module is realized respectively and connected, effectively that circuit height is integrated, and choose the acp chip that is integrated with microcontroller, baseband processing circuitry, RF transmit-receive circuit, greatly simplify circuit design, reduced to greatest extent the volume of read-write nucleus module.Have miniaturization, low-power consumption, effectively decipherment distance large, can embed the feature of other equipment, and have wide range of applications.
Accompanying drawing explanation
Fig. 1 is the structure principle chart of the present embodiment;
Fig. 2 is the physical circuit figure of electric power management circuit in Fig. 1;
Fig. 3 is the physical circuit figure of acp chip and peripheral circuit in Fig. 1;
Fig. 4 is the physical circuit figure of crystal oscillating circuit in peripheral circuit in Fig. 3;
Fig. 5 is the physical circuit figure of radio-frequency (RF) front-end circuit in Fig. 1;
Fig. 6 is the physical circuit figure of antenna configuration circuit in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, with embodiment, the utility model is described in further detail.
As shown in Figure 1, a kind of ultrahigh frequency RFID module for reading and writing, comprise electric power management circuit, acp chip, peripheral circuit, radio-frequency (RF) front-end circuit and antenna configuration circuit, described electric power management circuit is controlled input power current stabilization and is provided corresponding power supply for other circuit, described peripheral circuit comprises enable circuits, crystal oscillating circuit, phase-locked loop circuit, described radio-frequency (RF) front-end circuit is sent to acp chip through processing the radiofrequency signal that outputs to antenna configuration circuit and antenna configuration circuit is returned early stage for the radiofrequency signal that acp chip is emitted after balancedunbalanced conversion, described antenna configuration circuit is for being sent to radiofrequency signal the radiofrequency signal that antenna and receiving antenna return.
Under the control of acp chip, this read-write nucleus module can be controlled power consumption according to service condition, provide three kinds of states: duty, sleep state, holding state, in working order, each electronic circuit all runs well, radio-frequency (RF) front-end circuit sends carrier wave, carrier signal is passed through antenna transmission being sent to antenna configuration circuit after treatment, electronic label identification in effective identification range to after make respective operations and launch return signal, if return signal surpasses the threshold value of read-write nucleus module, antenna configuration circuit will be subject to this signal and be sent to radio-frequency (RF) front-end circuit by connection of antenna, after filtering, signal after demodulation is again by being converted to differential signal after Base-Band Processing, being sent to acp chip processes.In this process, radio-frequency (RF) front-end circuit can also monitor the power of radiofrequency signal, and return signal power is crossed conference acp chip is caused serious harm, and radio-frequency (RF) front-end circuit will play the function of power monitoring and protection.Electric power management circuit will provide required set LDO voltage signal in this process for each electronic circuit, the voltage stabilizing of power supply and filtering will directly have influence on the work efficiency of read-write nucleus module, and the part of the digital signal in radio-frequency (RF) front-end circuit and simulating signal part should separately be powered to guarantee two kinds of isolations between signal.
Below the detailed circuit design to each electronic circuit is described.
Fig. 2 is electric power management circuit figure, this circuit will provide operating voltage for each electronic circuit, due to the numerical portion in radio frequency unit and the power supply separately of simulation part, so will produce the output branch road of two 3.3V after voltage stabilizing, concrete circuit design as shown in Figure 2.This read-write nucleus module adopts 5V power supply, after VDD_IN input, after the high frequency noise that electric capacity filtering may exist after filtering, be input to three acp chip U11 of electric power management circuit, U21 and U31, before input pin, pure for assurance power supply that can maximum possible, has added ground connection filter capacitor and has carried out further filter away high frequency noise.Meanwhile, for convenient debugging test, add herein 0 Ω resistance as test node.This sentences U31 is example, filtered 5V power supply is connected to input end 2 pin and Enable Pin 1 pin of power supply chip, and 3 pin ground connection should be added an electric capacity and be reduced high frequency noise in ground connection process.In order to observe intuitively the working condition of electric power management circuit, at the output point interpolation voltage indicator lamp of power management chip, when normal out-put supply, pilot lamp is bright.As shown in Figure 2, output terminal VDD_33 provides 3.3V voltage for the simulation part in radio frequency chip, oscillating circuit, and VDD_33_1 provides voltage for the numerical portion in acp chip.Output pin 4 pin of U31 will be exported 3.6V voltage, after voltage stabilizing, link to voltage indicator lamp, and stabilized voltage supply will provide 3.3V voltage for crystal oscillating circuit and radio-frequency (RF) front-end circuit.
Choosing of acp chip directly determined volume, performance and the parameters of whole read-write nucleus module, by contrast main flow radio frequency chip on the market, the present embodiment has been chosen PR9000 as acp chip, it has the advantages such as integrated level is high, volume is little, low in energy consumption, and inner integrated can microcontroller, Base-Band Processing road, storer etc., be operated in 840MHz-960MHz frequency range.Fig. 3 is acp chip and peripheral circuit diagram, has comprised acp chip and the assurance circuit and the external interface circuit that guarantee the normal work of chip.1 pin of U1 not connecting resistance provides reference current for acp chip, 2 pin and the input of 12 pin link 3.3V voltage, for the simulation of chip partly provides power supply, acp chip utilizes 13 pin and 14 pin output radiofrequency signal, peak power output can reach 8.5dBm, 6 pin and 7 pin are radio frequency reception ends, receiving sensitivity is-86dBm, as long as the difference radio-frequency signal receiving is higher than this value, acp chip just can set radiofrequency signal, 17 pin link phase-locked loop circuits, 22 pin and 43 pin link 3.3V power supply, for the numerical portion of acp chip provides power supply, 24 pin are chip reset pins, 46 pin are chip enable end, connect high level effective, 48 pin are concussion input end, the oscillator signal of link crystal oscillating circuit output.
Crystal oscillating circuit as shown in Figure 4, it is crystal oscillator KT3225(U3 that the utility model is selected the acp chip of oscillatory circuit), VDD_ 33 input 3.3V voltages, after electric capacity, link after filtering 4 pin of U3, after divider resistance, link 1 pin, 2 pin ground connection, 3 pin outputs guarantee the 19.2MHz oscillator signal of acp chip operation, connect oscillator signal input pin 48 pin of acp chip after Gree electric capacity.
Fig. 5 and Fig. 6 are radio-frequency (RF) front-end circuit and antenna configuration circuit, the major function of radio-frequency (RF) front-end circuit is the differential signal input of acp chip output to be converted to single-ended radio frequency signal is input to antenna management circuit and single-ended signal that antenna management circuit is returned is converted to differential signal and is input to acp chip, and wherein the conversion between differential signal and single-ended signal is that balanced-unbalanced converting circuit is the core of this circuit.As shown in Figure 6, its major function is that the difference radio-frequency signal of acp chip output is converted to Single-end output, the balanced-to-unblanced transformer of choosing is 0900BL18B200(U2), the radiofrequency signal of checking the mark of acp chip output is input to 4 pin and 6 pin of U2 after matching network circuit balanced signal intensity, maximum signal is 8.5dBm, the output VDD33_3 of electric power management circuit provides the supply voltage of 3.3V, accesses after utilizing filter capacitor filter away high frequency noise.1 pin and 3 pin ground connection, 2 pin are by two single-ended signal output terminals that differential signal is synthetic, signal links to 1 pin of directional coupler U5 after low-pass filter network, and 2 pin output signals of directional coupler link thereafter radio-frequency antenna through low-pass filtering, and radiofrequency signal is sent.Reflected signal is exported through 3 pin, links to 6 pin of acp chip after low-pass filtering, by antenna reception to radiofrequency signal be input to acp chip, baseband processing circuitry is processed information wherein by microprocessor after processing.
More than explanation is only to explanation of the present utility model, make those of ordinary skills' can completely implement this programme, but be not to restriction of the present utility model, those skilled in the art can make to the present embodiment the modification that there is no creative contribution as required after reading this instructions, and these are all not creative modifications.But as long as within the scope of claim of the present utility model, be all subject to the protection of Patent Law.
Claims (1)
1. a ultrahigh frequency RFID module for reading and writing, it is characterized in that: comprise electric power management circuit, acp chip, peripheral circuit, radio-frequency (RF) front-end circuit and antenna configuration circuit, described electric power management circuit is controlled input power current stabilization and is provided corresponding power supply for other circuit, described peripheral circuit comprises enable circuits, crystal oscillating circuit, phase-locked loop circuit, described radio-frequency (RF) front-end circuit is sent to acp chip through processing the radiofrequency signal that outputs to antenna configuration circuit and antenna configuration circuit is returned early stage for the radiofrequency signal that acp chip is emitted after balancedunbalanced conversion, described antenna configuration circuit is for being sent to radiofrequency signal the radiofrequency signal that antenna and receiving antenna return.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420277246.9U CN203838735U (en) | 2014-05-23 | 2014-05-23 | Ultrahigh-frequency RFID read-write module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420277246.9U CN203838735U (en) | 2014-05-23 | 2014-05-23 | Ultrahigh-frequency RFID read-write module |
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| CN203838735U true CN203838735U (en) | 2014-09-17 |
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| CN201420277246.9U Expired - Fee Related CN203838735U (en) | 2014-05-23 | 2014-05-23 | Ultrahigh-frequency RFID read-write module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103971147A (en) * | 2014-05-23 | 2014-08-06 | 中山达华智能科技股份有限公司 | Ultra-high frequency RFID (Radio Frequency Identification) read-write module |
-
2014
- 2014-05-23 CN CN201420277246.9U patent/CN203838735U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103971147A (en) * | 2014-05-23 | 2014-08-06 | 中山达华智能科技股份有限公司 | Ultra-high frequency RFID (Radio Frequency Identification) read-write module |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20181211 Address after: 528415 No. 9 Shuiyi South Road, Taifeng Industrial Zone, Xiaolan Town, Zhongshan City, Guangdong Province Patentee after: Zhongshan Hengda Intelligent Technology Co., Ltd. Address before: 528415 No. 9 Shuiyi South Road, Taifeng Industrial Zone, Xiaolan Town, Zhongshan City, Guangdong Province Patentee before: Tatwah Smarttech Co., Ltd. |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140917 Termination date: 20200523 |