CN203930915U - The remote active device of a kind of 2.4G radio electronic label - Google Patents
The remote active device of a kind of 2.4G radio electronic label Download PDFInfo
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- CN203930915U CN203930915U CN201420316066.7U CN201420316066U CN203930915U CN 203930915 U CN203930915 U CN 203930915U CN 201420316066 U CN201420316066 U CN 201420316066U CN 203930915 U CN203930915 U CN 203930915U
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Abstract
The utility model discloses the remote active device of a kind of 2.4G radio electronic label, belong to low frequency wireless communication technical field, comprise microcontroller 1, modulation module 2, signal amplification module 3, radio-frequency (RF) signal strength detection module 4, communication interface 5, antenna 6, power supply, microcontroller 1 comprise data processing, signal generation and collection, AD detect with and external circuit control, microcontroller 1 is connected with described modulation module 2, radio-frequency (RF) signal strength detection module 4, communication interface 5 respectively; Modulation module 2 has ASK, for modulating and signal being outputed to described signal amplification module 3; Signal amplification module 3 is connected with antenna; Antenna 6 is connected with radio-frequency (RF) signal strength detection module 4, and antenna 6 has two groups.This device performance is high, can not only realize the excellent activation effect of 2.4G RFID electronic tag, can also assist the monitoring of carrying out electronic tag position and motion state simultaneously.
Description
Technical field
The utility model belongs to 2.4G low frequency wireless communication technical field, is specifically related to a kind of remote active device of 2.4G RFID (radio-frequency (RF) identification) electronic tag based on low-frequency wireless signal.
Background technology
Traditional remote active device of RFID electronic tag based on low-frequency wireless signal, the mode that adopts circulation to send 125k activation signal activates the 2.4G RFID electronic tag in dormancy.Active device under this traditional mode, exists transmitting antenna partial resonance point and 125k to have the defects such as activation effect is unstable, active distance is near in actual applications.
Utility model content
The purpose of this utility model is for above defect, a kind of high performance low-frequency excitation device is provided, the activation effect that can not only realize 2.4G RFID electronic tag by this device is excellent, can also assist the monitoring of carrying out electronic tag position and motion state simultaneously.
The utility model is taked following technical scheme:
The remote active device of a kind of 2.4G radio electronic label, comprise microcontroller, modulation module, signal amplification module, radio-frequency (RF) signal strength detection module, communication interface, antenna, power supply, described microcontroller comprise data processing, signal generation and collection, AD detect with and external circuit control, described microcontroller is connected with described modulation module, radio-frequency (RF) signal strength detection module, communication interface respectively; Described modulation module has ASK (amplitude-shift keying), for modulating and signal being outputed to described signal amplification module; Described signal amplification module is connected with antenna; Described antenna is connected with described radio-frequency (RF) signal strength detection module, for detection of the current value of described antenna.
Further technical scheme is: described microcontroller has PWM (width modulation) module, for generation of carrier wave and be transferred to modulation module; Described microcontroller also has ADC (analog/digital converter) module, for receiving and detect the electric current of being inputted by radio-frequency (RF) signal strength detection module.
Further technical scheme is: described microcontroller comprises two groups of data pre-service, and described data pre-service comprises carries out an inverted sequence operation, Manchester's cde and compression to CRC (cyclic redundancy check (CRC) code) data.
Further technical scheme is: described modulation module comprises two groups of NPN triode modulation circuits, the source electrode of described NPN triode connects the carrier wave of the PWM generation of described microcontroller, the base stage of described NPN triode connects the data-signal that microcontroller produces, and data-signal is exported by emitter-base bandgap grading after the modulation of NPN triode.
Further technical scheme is: output terminal and the antenna input of described signal amplification circuit are in series with power resistor.
Further technical scheme is: radio-frequency (RF) signal strength detection module has emissive porwer testing circuit, described emissive porwer testing circuit has subtraction circuit and detecting circuit, described subtraction circuit has operational amplifier, its input end connects two level at described power resistor two ends, its output terminal output AC signal also connects described detecting circuit, then export DC level.
Further technical scheme is: described antenna has two groups, mates respectively two groups of 125K radiating circuits.
Further technical scheme is: described communication interface is that USB turns UART interface, for connecting PC and equipment, carrys out parameters and issues steering order data layout.
The utility model compared with prior art, has following beneficial effect: on the one hand, by data being carried out to an inverted sequence pre-service, effectively prevented the drift of communication data; By 125K hands-off tuning, complete antenna optimum frequency point Auto-matching, make 125K carrier wave and data bit rate degree of stability high, realize 2.4G electronic tag activation effect is stablized,, by control signal intensity, automatically detect meanwhile, realized more at a distance and having activated.On the other hand, the design of two groups of 125K radiating circuits by two groups of antennas and coupling thereof, can also assist the monitoring of carrying out electronic tag position and motion state.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present utility model;
Fig. 2 is the utility model modulation module circuit theory diagrams;
Fig. 3 is signals reverse output schematic diagram in the utility model;
Fig. 4 a is local amplifying circuit schematic diagram of the present utility model;
Fig. 4 b is another local amplifying circuit schematic diagram of the present utility model;
Fig. 5 is the subtraction circuit schematic diagram of the utility model radio-frequency signal detection module
Fig. 6 a is the signal demodulator circuit theory diagrams of the utility model radio-frequency signal detection module;
Fig. 6 b is another signal demodulator circuit theory diagrams of the utility model radio-frequency signal detection module.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described in further detail:
A preferred embodiment of the present utility model:
As shown in Figure 1, the remote active device of a kind of 2.4G radio electronic label, comprise microcontroller 1, modulation module 2, signal amplification module 3, radio-frequency (RF) signal strength detection module 4, communication interface 5, antenna 6, power supply, microcontroller 1 comprises data processing, signal produces and gathers, AD detect with and external circuit control, microcontroller 1 respectively with described modulation module 2, radio-frequency (RF) signal strength detection module 4, communication interface 5 connects, the PWM module of microcontroller 1, for generation of carrier wave and be transferred to modulation module 2, the ADC module of microcontroller 1, for receiving and detect the electric current by 4 inputs of radio-frequency (RF) signal strength detection module, modulation module 2 has ASK module, for modulating and signal being outputed to signal amplification module 3, signal amplification module 3 is connected with antenna 6, antenna 6 is connected with radio-frequency (RF) signal strength detection module 4, and for detection of the current value of antenna 6, antenna 6 disposes two groups, i.e. T2 and T4, and correspondence is organized 125k radiating circuit between two respectively.
Tag activation principle of work: microcontroller 1 carries out data pre-service when initialization, when needs activate label, microcontroller 1 is controlled its I/O traffic spike is input to modulation module 2, carrier wave and data stream that modulation module 2 produces PWM are carried out ASK modulation, signal after modulation amplifies via signal amplification module 3, and then be radiated in perform region by antenna 6, complete the transmitting of activation signal.
Another preferred embodiment of the present utility model:
Table 1. data communication order format
As shown in table 1,125k rf data preprocessing process, rf data is launched altogether 4byte data, comprising 2byte data and 2byte verification.Be verified as the CRC16 of data, for example, in order to prevent that producing data bit drift in process that data transmit has aloft carried out position inverted sequence operation to second of CRC data byte, becomes 0xCE after 0x73 inverted sequence.Finally these group data are carried out to Manchester's cde and packing.Can comprise the pre-service of at least two group data.
As shown in Figure 2,125k carrier wave occurs and modulated process.First 125k radiofrequency signal generator modulation module produces one group of stabilized carrier (PWM) and the source electrode C to NPN triode Q4 by this carrier signal injection by the PWM pin of microcontroller 1, the modulation I/O (MOD0) of microcontroller 1 under the help of timer according to specifying baud rate (4096bps), the data that send as required produce data-signal, and signal connects R20 and modulates by exporting PWM0 by emitter-base bandgap grading E by NPN triode Q4.Same mode, the modulation I/O (MOD1) of microcontroller 1 under the help of timer according to specifying baud rate (4096bps), the data that send as required produce data-signal, and signal connects R21 and modulates by exporting PWM1 by emitter-base bandgap grading E by NPN triode Q5.As shown in Figure 3, then PWM1 and PWM0 are oppositely exported, increase its current driving ability.
Signal strength detection principle: the I/O that maintenance microcontroller 1 is connected with modulation module 2, always in high level, will be now carrier wave via the signal after ASK modulation always, can launch equally after carrier wave amplifies.As shown in Fig. 4 a, by amplifying the power resistor R4 in resistance 5 Europe the level at resistance two ends is sampled of connecting between the input end of output terminals A 1 and antenna T2, obtain two level A1 and B1, these two level are input in a subtraction circuit based on operational amplifier, as shown in Figure 5, the output terminal of subtraction circuit will obtain an AC signal OP1, detecting circuit as shown in Figure 6 a, this AC signal OP1 is carried out can obtaining an AD1 DC level (Vs1) after detection, the size of this DC level AD1 and the electric current of input aerial T2 are that aerial radiation value exists positive correlation.According to this characteristic, can detect transmit signal strength; Same method, as shown in Fig. 4 b, Fig. 5, Fig. 6 b, by amplifying the power resistor R5 in resistance 5 Europe the level at resistance two ends is sampled of connecting between the input end of output terminals A 2 and antenna T4, can obtain another AD2 DC level (Vs2), according to this characteristic, can detect the transmit signal strength of another root antenna T4.
Antenna optimum frequency point Auto-matching process: set the value that each start and specific time period make modulation signal pin (MOD0) keep high level and detect Vs by ADC in application process, now in the frequency of a PWM of 100k Hz～150kHz frequency range interscan, and can make Vs reach maximum value PWM set of frequency, this has just completed the hands-off tuning of 125k signal.The carrier wave of equipment will keep this frequency to carry out work before next hands-off tuning always.If PWM Vs when 125k will be judged as radio-frequency antenna fault and send alerting signal and the work that stops radio frequency part lower than a certain threshold value simultaneously.
Another preferred embodiment of the present utility model:
2.4G electronic tag position and motion state monitoring: owing to having configured two groups of antennas and two groups of corresponding 125k radiating circuits simultaneously, respectively two groups of antennas corresponding to circuit are arranged on to the interior survey (this antenna is designated as T2) at gate and the outside (this antenna is designated as T4) at gate, T2 and T4 antenna send respectively different identification id 2 and ID4, when electronic tag moves from inside to outside, will certainly first by T2, be activated and then be activated by T4, after label is activated, will by 2.4G, send the packet of ID2, ID4.By special-purpose 2.4G signal receiving device, by successively receiving the packet that comprises ID2, ID4, via the packet of receiving the sequencing of packet and finally receiving, can judge label and move from inside to outside, otherwise in like manner.
The embodiment that another is more preferably of the present utility model:
Configuration feature: communication interface 5 adopts USB to turn UART interface, carrys out parameters and issues steering order data layout for connecting PC and equipment.
" embodiment " that spoken of in this manual, " another embodiment ", " embodiment " etc., the specific features, structure or the feature that refer in conjunction with this embodiment description are included at least one embodiment of the application's generality description.In instructions, a plurality of local appearance statement of the same race is not necessarily to refer to same embodiment.Furthermore, while describing a specific features, structure or feature in conjunction with arbitrary embodiment, what advocate is in conjunction with other embodiment, to realize this feature, structure or feature also to drop in scope of the present utility model.
Although the utility model is described with reference to a plurality of explanatory embodiment of the present utility model here, but, should be appreciated that, those skilled in the art can design a lot of other modification and embodiments, and these are revised and within embodiment will drop on the disclosed principle scope and spirit of the application.More particularly, in the scope of, accompanying drawing open in the application and claim, can carry out multiple modification and improvement to the building block of subject combination layout and/or layout.Except modification that building block and/or layout are carried out with improving, to those skilled in the art, other purposes will be also obvious.
Claims (8)
1. the remote active device of 2.4G radio electronic label, comprise microcontroller (1), modulation module (2), signal amplification module (3), radio-frequency (RF) signal strength detection module (4), communication interface (5), antenna (6), power supply, it is characterized in that described microcontroller (1) comprise data processing, signal generation and collection, AD detect with and external circuit control, described microcontroller (1) is connected with described modulation module (2), radio-frequency (RF) signal strength detection module (4), communication interface (5) respectively; Described modulation module (2) has ASK module, for modulating and signal being outputed to described signal amplification module (3); Described signal amplification module (3) is connected with antenna; Described antenna (6) is connected with described radio-frequency (RF) signal strength detection module (4), for detection of the current value of described antenna (6).
2. according to the remote active device of 2.4G radio electronic label described in claim 1, it is characterized in that described microcontroller (1) has PWM module, for generation of carrier wave and be transferred to modulation module (2); Described microcontroller (1) also has ADC module, for receiving and detect the electric current by radio-frequency (RF) signal strength detection module (4) input.
3. according to the remote active device of 2.4G radio electronic label described in claim 1, it is characterized in that described microcontroller (1) comprises two groups of data pre-service, described data pre-service comprises carries out an inverted sequence operation, Manchester's cde and compression to CRC data.
4. according to the remote active device of 2.4G radio electronic label described in claim 1, it is characterized in that described modulation module (2) comprises two groups of NPN triode modulation circuits, the source electrode of described NPN triode connects the carrier wave of the PWM generation of described microcontroller (1), the base stage of described NPN triode connects the data-signal that microcontroller (1) produces, and data-signal is exported by emitter-base bandgap grading after the modulation of NPN triode.
5. according to the remote active device of 2.4G radio electronic label described in claim 1, it is characterized in that described signal amplification module (3) comprises signal amplification circuit, output terminal and the antenna input of described signal amplification circuit are in series with power resistor.
6. according to the remote active device of 2.4G radio electronic label described in claim 5, it is characterized in that radio-frequency (RF) signal strength detection module (4) has emissive porwer testing circuit, described emissive porwer testing circuit has subtraction circuit and detecting circuit, described subtraction circuit has operational amplifier, its input end connects two level at described power resistor two ends, its output terminal output AC signal also connects described detecting circuit, then export DC level.
7. according to the remote active device of 2.4G radio electronic label described in claim 1, it is characterized in that described antenna (6) has two groups, mates respectively two groups of 125K radiating circuits.
8. according to the remote active device of 2.4G radio electronic label described in claim 1, it is characterized in that described communication interface (5) turns UART interface for USB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420316066.7U CN203930915U (en) | 2014-06-13 | 2014-06-13 | The remote active device of a kind of 2.4G radio electronic label |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420316066.7U CN203930915U (en) | 2014-06-13 | 2014-06-13 | The remote active device of a kind of 2.4G radio electronic label |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203930915U true CN203930915U (en) | 2014-11-05 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420316066.7U Expired - Fee Related CN203930915U (en) | 2014-06-13 | 2014-06-13 | The remote active device of a kind of 2.4G radio electronic label |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203930915U (en) |
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2014
- 2014-06-13 CN CN201420316066.7U patent/CN203930915U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: RFC TECHNOLOGY CO., LTD. Free format text: FORMER NAME: CHENGDU AIFU COMMUNICATIONS CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: West high tech Zone Fucheng Road in Chengdu city of Sichuan province 610000 No. 399 No. 8 No. 901 Patentee after: Chengdu Aifu Communication Co., Ltd. Address before: West high tech Zone Fucheng Road in Chengdu city of Sichuan province 610000 No. 399 No. 8 No. 901 Patentee before: Chengdu Aifu Communication Co., Ltd. |
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| PP01 | Preservation of patent right |
Effective date of registration: 20160912 Granted publication date: 20141105 |
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| RINS | Preservation of patent right or utility model and its discharge | ||
| PD01 | Discharge of preservation of patent | ||
| PD01 | Discharge of preservation of patent |
Date of cancellation: 20170811 Granted publication date: 20141105 |
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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: 20141105 Termination date: 20170613 |