CN204155285U - A kind of RFID frequency conversion card reader of bluetooth enable - Google Patents
A kind of RFID frequency conversion card reader of bluetooth enable Download PDFInfo
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- CN204155285U CN204155285U CN201420685601.6U CN201420685601U CN204155285U CN 204155285 U CN204155285 U CN 204155285U CN 201420685601 U CN201420685601 U CN 201420685601U CN 204155285 U CN204155285 U CN 204155285U
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Abstract
The utility model discloses a kind of RFID frequency conversion card reader of bluetooth enable, comprise MCU master control chip, pumping signal transmitter unit and feedback signal reception unit, pumping signal transmitter unit comprises: the Direct Digital Frequency Synthesizers DDS1 be connected with MCU master control chip; The impedance matching circuit be connected with DDS1; The low-pass filter be connected with impedance matching circuit; The gain amplifier be connected with low-pass filter and the emitting antenna part be connected with gain amplifier; Feedback signal reception unit comprises: receiving antenna part; The differential signal source part be connected with MCU master control chip, this differential signal source part is for generation of another road mixer-input signal, and it is consistent with the signal generating circuit structure of pumping signal transmitter unit that this input signal produces circuit structure; Receive frequency mixer and the intermediate frequency amplifier of input signal.The utility model not only can read VHF frequency range label, also information can be sent to mobile terminal, thus the novel RFID label tag card reader of display stored prod information.
Description
Technical field
The utility model relates to a kind of card reader, relate to one specifically and be operated in VHF frequency range, for detecting the label of passive chipless, and testing result is sent to the RFID label tag card reader on mobile terminal by bluetooth, its IPC international Patent classificating number is G06K 7/00.
Background technology
At present, known RFID card reader principle of work is after RFID label tag enters magnetic field, receive the radiofrequency signal that plug-in reader sends, the energy obtained by means of induction current sends out storage product information in the chips, or initiatively send the signal of a certain frequency, plug-in reader reads information and after decoding, delivers to CIS and carry out relevant data process Storage & Display; Corresponding, passive label and active label can be divided into.
But for active label, the frequency of operation of active label needed for it is generally UHF ultrahigh frequency, and corresponding label requires to arrange high frequency chip equally, and therefore the cost of product is higher; And for passive label, its frequency of operation is near medium-high frequency 13.56Mhz, message transmission rate is lower, or be relatively concentrated on 902 ~ 928MHz working frequency range at ultrahigh frequency, frequency is too high, known RFID card reader can not carry out efficient identification to it, and simultaneously known RFID card reader can only can only scan specific VHF frequency by acoustic-optic indicator, seldom has the function that label information can be shown on mobile terminals.
Summary of the invention
In view of the defect that prior art exists, the purpose of this utility model to provide one not only can read VHF (50M-500MHz) frequency range label, also can while reading tag information, information is sent to mobile terminal, thus the novel RFID label tag card reader of display stored prod information.
To achieve these goals, the technical solution of the utility model:
A RFID frequency conversion card reader for bluetooth enable, comprises MCU master control chip, pumping signal transmitter unit and feedback signal reception unit, it is characterized in that:
Described pumping signal transmitter unit comprises:
The Direct Digital Frequency Synthesizers DDS1 be connected with MCU master control chip, for generation of the differential signal carrying out frequency sweep;
The impedance matching circuit be connected with Direct Digital Frequency Synthesizers DDS1, for ensureing that above-mentioned differential signal effectively can transmit and convert above-mentioned differential signal to single-ended signal;
The low-pass filter be connected with impedance matching circuit, for carrying out filtering process by the ultraharmonics in above-mentioned single-ended signal;
The gain amplifier be connected with low-pass filter, for stablizing the signal gain that it exports;
And the emitting antenna part to be connected with gain amplifier, for tag excitation signal is launched;
Described feedback signal reception unit comprises:
Receiving antenna part, for generating a road mixer-input signal by after the tag feedback received signal transacting;
The differential signal source part be connected with MCU master control chip, this differential signal source part is for generation of another road mixer-input signal, it is consistent with the signal generating circuit structure of described pumping signal transmitter unit that this input signal produces circuit structure, namely comprises the gain amplifier of Direct Digital Frequency Synthesizers DDS2, corresponding impedance matching circuit, corresponding low-pass filter and correspondence equally;
Receive the frequency mixer of above-mentioned two-way input signal, for producing corresponding intermediate-freuqncy signal by after the mixing of two-way input signal;
The intermediate frequency amplifier be connected with frequency mixer, feeds back to MCU master control chip after above-mentioned intermediate-freuqncy signal being carried out amplification process.
Described RFID label tag card reader also comprises the data communication module carrying out with MCU master control chip communicating, and stores for the label information after the process of MCU master control chip being sent to mobile terminal information of carrying out and reading.
Wherein, described data communication module refers to bluetooth communication module, and this bluetooth communication module can be substituted by infrared communication module and wireless communication module simultaneously.
Described emitting antenna part comprises the emitting antenna, sub-miniature A connector, emitting antenna match circuit and the antenna transmission circuit that are linked in sequence successively.
Described receiving antenna part comprises the antenna receive circuit, receiving antenna, sub-miniature A connector and the receiving antenna match circuit that are linked in sequence successively.
Further, described receiving antenna part also comprises the low noise amplifier be connected with frequency mixer, and it carries out noise reduction for the tag feedback signal that will receive and amplifies process.
Described gain amplifier provides power supply voltage signal and gate-control signal respectively by two-way reference voltage source.
The preferred variable gain amplifier of above-mentioned gain amplifier.
Simultaneously described RFID frequency conversion card reader, can also comprise RFID frequency conversion card reader pcb board, power switch, illuminating lamp, bi-colour light, Bluetooth switch, Micro USB, antenna, one or more parts combined in battery and short-circuit board.
Compared with prior art, the beneficial effects of the utility model: the utility model not only can read VHF (50M-500MHz) frequency range label, also while reading tag information, information can be sent to mobile terminal, thus the novel RFID label tag card reader of display stored prod information.
Accompanying drawing explanation
Fig. 1 is circuit structure diagram of the present utility model;
Fig. 2 is Direct Digital Frequency Synthesizers of the present utility model and impedance matching circuit partial circuit schematic diagram;
Fig. 3 is circuit theory diagrams of the present utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearly understand, below in conjunction with accompanying drawing, the utility model is further elaborated.
The problem of specific VHF frequency can only can only be scanned by acoustic-optic indicator in order to change existing RFID card reader, we improve the circuit structure of card reader, make it not only can read VHF (50M-500MHz) frequency range label, also can while reading tag information, information is sent to mobile terminal, thus display stored prod information.
Given this, as Fig. 1-Fig. 3, the utility model devises a kind of RFID frequency conversion card reader, and it mainly comprises MCU master control chip, pumping signal transmitter unit and feedback signal reception unit and stores and the data communication module read for the label information after the process of MCU master control chip being sent to mobile terminal information of carrying out.
Wherein, described pumping signal transmitter unit comprises the Direct Digital Frequency Synthesizers DDS1 be linked in sequence successively, the impedance matching circuit corresponding with Direct Digital Frequency Synthesizers DDS1, low-pass filter, variable gain amplifier and emitting antenna part:
This part circuit design principle: MCU master control chip controls Direct Digital Frequency Synthesizers DDS1 produces the differential signal of frequency at 50M-500Mhz, via impedance matching circuit (Balun impedance matching circuit can be adopted), ensure that all signals can be transmitted on the one hand, the reflection avoiding impedance mismatch to produce is namely in order to make the output impedance of transmitter unit and Antenna Impedance Matching (both does not mate and can produce standing wave), and then affect output power, on the other hand also for differential signal is converted to single-ended signal; Low-pass filter receives each harmonic that this single-ended signal will produce during frequency synthesis, and unwanted frequency filters out;
In order to ensure intensity and the emissive power of signal, decay in the process that anti-stop signal is propagated between antenna excessive receiving end obtain less than signal, and in view of this digital frequency synthesizer is along with the change of frequency, its amplitude produced is change, so coordinate an automatic gaining controling chip and variable gain amplifier to carry out stable output gain signal.And the control of automatic gaining controling chip is the detection by detecting circuit, according to detection amplitude out, calculate and need much gains to realize, thus the waveform exported when variable gain amplifier is worked is rounder and more smooth.And use two reference voltage sources to provide supply voltage and gate-control signal for variable gain amplifier; Signal is finally delivered to emitting antenna part and is sent, and described emitting antenna part comprises the emitting antenna, sub-miniature A connector, emitting antenna match circuit and the antenna transmission circuit that are linked in sequence successively.
Wherein, described feedback signal reception unit comprises the receiving antenna part be linked in sequence successively, the variable gain amplifier comprising Direct Digital Frequency Synthesizers DDS2, corresponding impedance matching circuit, corresponding low-pass filter and correspondence equally, frequency mixer and intermediate frequency amplifier.
The signal received is sent to an input end of frequency mixer by receiving antenna part, another input end of frequency mixer receives equally by signal that another road signal source (DDS2) of MCU master control chip controls produces, its producing method is identical with the first via, above-mentioned two input signals carry out difference frequency via frequency mixer and produce intermediate-freuqncy signal (its intermediate-freuqncy signal of product of our company's design is generally 455khz), through intermediate frequency amplifier, signal is carried out to intermediate-freuqncy signal again and amplify process, described intermediate-freuqncy signal can also be passed through to carry out signal through intermediate frequency amplifier to intermediate-freuqncy signal again after detection filter circuit (comprise limiter and carry out amplitude limit) carries out detection filter to it and amplify process, produce rssi to export, namely the baseband signal output signal of stable superheterodyne detection is obtained, again this signal is fed back to MCU master control chip by ADC, so that the process of settling signal and judge the presence or absence of label.
Described receiving antenna part comprises the antenna receive circuit, receiving antenna, sub-miniature A connector and the receiving antenna match circuit that are linked in sequence successively.
Further, described receiving antenna part also comprises the low noise amplifier be connected with frequency mixer, and it carries out noise reduction for the tag feedback signal that will receive and amplifies process.
Cleaning Principle of the present utility model is simultaneously: when there being label near antenna, signal on antenna will produce electromagnetic coupled on label, the amplitude aspect of the signal causing receiving antenna to receive creates very large decay, reaches object label being detected after detecting this decay.
In practical study, applicant also finds that antenna design criteria parameter is: within its tuning-points should not be in 200MHz, require when without during label and antenna distance when being greater than 50cm, the signal that receiving antenna receives is that (decay is less than about 10dB to-50db with the signal ratio of transmission antennas transmit, the gain of band internal antenna is-20dB), its signal energy regional stability received in whole 200MHz bandwidth interval, after detection, signal is tending towards smooth.
Can only acoustic-optic indicator in order to what solve common card reader, and the problem of information storage can not be carried out, we also add bluetooth communication module, for linking up mobile terminal and MCU, make label information can carry out storage display at mobile terminal.
The utility model can also comprise card reader pcb board, power switch, illuminating lamp simultaneously, bi-colour light, Bluetooth switch, Micro USB, antenna, the miscellaneous part such as battery and short-circuit board, card reader outside surface is provided with power switch, illuminating lamp, bi-colour light, Bluetooth switch, the card reader bottom is antenna stack, can be provided with MicroUSB and antenna part, bottom last layer is PCB layer, then last layer is made up of battery and short-circuit board.
In sum, the utility model can be carry out frequency sweep between 50M-500Mhz in frequency, can read the passive and active label of this frequency range, and can carry out the communication with hand-held mobile terminal by its bluetooth module wherein.
The above; be only the utility model preferably embodiment; but protection domain of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; be equal to according to the technical solution of the utility model and utility model design thereof and replace or change, all should be encompassed within protection domain of the present utility model.
Claims (8)
1. a RFID frequency conversion card reader for bluetooth enable, comprises MCU master control chip, pumping signal transmitter unit and feedback signal reception unit, it is characterized in that:
Described pumping signal transmitter unit comprises:
The Direct Digital Frequency Synthesizers DDS1 be connected with MCU master control chip, for generation of the differential signal carrying out frequency sweep;
The impedance matching circuit be connected with Direct Digital Frequency Synthesizers DDS1, for ensureing that above-mentioned differential signal effectively can transmit and convert above-mentioned differential signal to single-ended signal;
The low-pass filter be connected with impedance matching circuit, for carrying out filtering process by the ultraharmonics in above-mentioned single-ended signal;
The gain amplifier be connected with low-pass filter, for stablizing the signal gain that it exports;
And the emitting antenna part to be connected with gain amplifier, for tag excitation signal is launched;
Described feedback signal reception unit comprises:
Receiving antenna part, for generating a road mixer-input signal by after the tag feedback received signal transacting;
The differential signal source part be connected with MCU master control chip, this differential signal source part is for generation of another road mixer-input signal, it is consistent with the signal generating circuit structure of described pumping signal transmitter unit that this input signal produces circuit structure, namely comprises the gain amplifier of Direct Digital Frequency Synthesizers DDS2, corresponding impedance matching circuit, corresponding low-pass filter and correspondence equally;
Receive the frequency mixer of above-mentioned two-way input signal, for producing corresponding intermediate-freuqncy signal by after the mixing of two-way input signal;
The intermediate frequency amplifier be connected with frequency mixer, feeds back to MCU master control chip after above-mentioned intermediate-freuqncy signal being carried out amplification process.
2. the RFID frequency conversion card reader of bluetooth enable according to claim 1, it is characterized in that: described RFID label tag card reader also comprises the data communication module carrying out with MCU master control chip communicating, store for the label information after the process of MCU master control chip being sent to mobile terminal information of carrying out and reading.
3. the RFID frequency conversion card reader of bluetooth enable according to claim 2, is characterized in that: described data communication module refers to bluetooth communication module, and this bluetooth communication module can be substituted by infrared communication module and wireless communication module simultaneously.
4. the RFID frequency conversion card reader of bluetooth enable according to claim 1, is characterized in that: described emitting antenna part comprises the emitting antenna, sub-miniature A connector, emitting antenna match circuit and the antenna transmission circuit that are linked in sequence successively.
5. the RFID frequency conversion card reader of bluetooth enable according to claim 1, is characterized in that: described receiving antenna part comprises the antenna receive circuit, receiving antenna, sub-miniature A connector and the receiving antenna match circuit that are linked in sequence successively.
6. the RFID frequency conversion card reader of bluetooth enable according to claim 5, is characterized in that: described receiving antenna part also comprises the low noise amplifier be connected with frequency mixer, and it carries out noise reduction for the tag feedback signal that will receive and amplifies process.
7. the RFID frequency conversion card reader of bluetooth enable according to claim 1, is characterized in that: described gain amplifier provides power supply voltage signal and gate-control signal respectively by two-way reference voltage source.
8. the RFID frequency conversion card reader of the bluetooth enable according to claim 1 or 7, is characterized in that: the preferred variable gain amplifier of described gain amplifier.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420685601.6U CN204155285U (en) | 2014-11-14 | 2014-11-14 | A kind of RFID frequency conversion card reader of bluetooth enable |
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| CN201420685601.6U CN204155285U (en) | 2014-11-14 | 2014-11-14 | A kind of RFID frequency conversion card reader of bluetooth enable |
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| CN204155285U true CN204155285U (en) | 2015-02-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108062495A (en) * | 2017-12-29 | 2018-05-22 | 广东华大互联网股份有限公司 | A kind of system and method that remote RF Card Readers are realized using transmitting-receiving separation |
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2014
- 2014-11-14 CN CN201420685601.6U patent/CN204155285U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108062495A (en) * | 2017-12-29 | 2018-05-22 | 广东华大互联网股份有限公司 | A kind of system and method that remote RF Card Readers are realized using transmitting-receiving separation |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of utility model: An RFID variable frequency card reader with Bluetooth function Effective date of registration: 20230421 Granted publication date: 20150211 Pledgee: China CITIC Bank Co.,Ltd. Dalian Branch Pledgor: RISING (DALIAN) Co.,Ltd. Registration number: Y2023210000087 |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |