CN103778396A - RFID system and method for automatically adjusting emission field intensity thereof - Google Patents
RFID system and method for automatically adjusting emission field intensity thereof Download PDFInfo
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- CN103778396A CN103778396A CN201310189582.8A CN201310189582A CN103778396A CN 103778396 A CN103778396 A CN 103778396A CN 201310189582 A CN201310189582 A CN 201310189582A CN 103778396 A CN103778396 A CN 103778396A
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Abstract
The invention relates to an RFID system and a method for automatically adjusting the emission field intensity thereof. The RFID system comprises a main control unit, a radio frequency unit electrically connected with the main control unit, and an antenna unit electrically connected with the radio frequency unit. The RFID system is of a type in which a reading head wakes tags up initiatively. The RFID system further comprises a close-range detection sensing unit electrically connected with the main control unit, wherein the close-range detection sensing unit is capable of sensing the distance between an electronic tag and the close-range detection sensing unit and giving out a detection signal, and the detection signal is a parameter of the distance; and the main control unit starts the radio frequency unit to emit mission field intensity with set strength when the detection signal exceeds a set threshold value and adjusts the emission field intensity emitted by the radio frequency unit according to variations of the detection signal. The method provided by the invention can realize automatic adjustment of the emission field intensity simply by adopting a simple and convenient method with a low cost.
Description
Technical field
The present invention relates to rfid system, particularly relevant with the technology of the automatic adjusting transmitting field intensity of rfid system.
Background technology
Existing active rfid system generally includes main control unit, the radio frequency unit being connected with this main control unit and the antenna element being connected with this radio frequency unit, wherein, this radio frequency unit is subject to the control of this main control unit, and send the radiofrequency signal of setting intensity, can carry out read-write operation to the electronic tag in a setting range by the radiation of this antenna element.This structure, in order to ensure the effective read-write in setting range, often needs radio frequency unit to continue to remain on emission state, and consumed power is larger, both wastes energy, also causes radio-frequency pollution.For this reason, people have proposed the improvement with the intensity of the radiofrequency signal that regulon is launched adaptively according to the relative position of the relative antenna element of electronic tag, as Chinese patent CN201110132180.5 discloses a kind of method of identifying the intelligence adjusting communication distance of rfid system for active rfid, based on the active rfid identification rfid system that comprises label and read write line; Described read write line comprises microcontroller MCU, is electrically connected tunable radio frequency front end, fixed RF front end and the host computer communication interface of this microcontroller MCU; Described tunable radio frequency front end is also electrically connected the signal conditioner for implementing to regulate radio frequency power output and radio frequency reception sensitivity; Described method comprises the steps: described in A. that label is set up Radio-Frequency Wireless Communication with the fixed RF front end of described read write line and links; B. in the time that described label judges that the type of described read write line supports that intelligence regulates communication distance pattern, carry out subsequent step C to step D; C. the tunable radio frequency front end of described label and described read write line is set up communication linkage; D. regulate radio frequency power output and the radio frequency reception sensitivity of radio-frequency front-end by the signal conditioner of described read write line, make described label and read write line be operated on the optimal distance.This active rfid system is to match with an original fixed RF front end by setting up a tunable radio frequency front end, realizing radio-frequency (RF) signal strength in conjunction with corresponding software regulates according to the distance of electronic tag and antenna, to save power consumption, because needs are set up a tunable radio frequency front end extraly, understand complicacy and the cost of increase system, and reach the also more complicated of method of function.Visible, be necessary existing active rfid system to further improve in fact.
Summary of the invention
Fundamental purpose of the present invention is to provide a kind of rfid system, can realize and automatically regulate transmitting field intensity with simple, lower cost and easier method.
To achieve these goals, the present invention proposes a kind of rfid system, a radio frequency unit that comprise a main control unit, is electrically connected with this main control unit and the antenna element being electrically connected with this radio frequency unit, and this rfid system is that read head initiatively wakes label type up; This rfid system also comprise be electrically connected with this main control unit one closely detect sensing unit, this closely detect sensing unit be can sensing one electronic tag a spacing between own and the detectable signal that provides, this detectable signal is the parameter of this spacing; This main control unit starts the transmitting field intensity of this radio frequency unit transmitting one setting intensity in the time that this detectable signal is crossed over a setting threshold, and the transmitting field intensity that regulates this radio frequency unit to launch in the variation according to this detectable signal subsequently.This rfid system structure, can realize any point in the distance range of setting, and all guarantees that the field intensity that electronic tag receives is consistent.
This closely detects sensing unit color or optical sensor detects distance.
This closely detects sensing unit and is arranged on the central spot of the radiation field of this antenna element.
This setting threshold is corresponding with a setting value of this spacing.
The setting value of this spacing is no more than 5 centimetres.
To achieve these goals, the present invention also proposes a kind of rfid system and automatically regulates the method for launching field intensity, this rfid system comprises a main control unit, the radio frequency unit being electrically connected with this main control unit and the antenna element being electrically connected with this radio frequency unit, and this rfid system is that read head initiatively wakes label type up; What this rfid system is also comprised be electrically connected with this main control unit one closely detects sensing unit, make this closely detect sensing unit be can sensing one electronic tag a spacing between own and the detectable signal that provides, this detectable signal is the parameter of this spacing; Make this main control unit in the time that this detectable signal is crossed over a setting threshold, start this radio frequency unit transmitting one to set the transmitting field intensity of intensity, and the transmitting field intensity that regulates this radio frequency unit to launch in the variation according to this detectable signal subsequently.
Compared with prior art, rfid system of the present invention and the automatically method of adjusting transmitting field intensity, closely detect sensing unit and can provide the detectable signal changing with electronic tag and the spacing of self to main control unit by arranging dexterously, so that this main control unit correspondingly regulates the transmitting field intensity of launching of radio frequency unit, structure is simpler, cost is lower, and implementation method is easy.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of rfid system embodiment of the present invention.
Fig. 2 is the principle of work process flow diagram of rfid system embodiment of the present invention.
Wherein, description of reference numerals is as follows: 1 main control unit 2 radio frequency unit 3 antenna elements 4 closely detect sensing unit 6 detectable signal 7 control signal 8 radiofrequency signal 20 electronic tag d spacing.
Embodiment
In order to describe structure of the present invention and feature place in detail, hereby lift following preferred embodiment and coordinate accompanying drawing to be described as follows.
Referring to Fig. 1, rfid system embodiment of the present invention roughly comprises: a main control unit 1, the radio frequency unit 2 being electrically connected with this main control unit 1, the antenna element 3 being electrically connected with this radio frequency unit 2 and be electrically connected with this main control unit 1 one closely detect sensing unit 4.This rfid system is that read head initiatively wakes label type up.
This main control unit 1 includes microprocessor, closely detects the detectable signal 6 that sensing unit 4 provides and sends control signal 7 to this radio frequency unit 2 for catching this.
This radio frequency unit 2 includes RF transceiver circuit, can carry out according to the control signal of this main control unit 17 intensity of its radio frequency of launching of dynamic adjustments.
This antenna element 3, matches with this radio frequency unit 2, the radiofrequency signal of Strength Changes 8 can be converted to the radiation field of intensity transformation, comes to match with electronic tag 20.
This is detecting sensor 4 closely, can change and provide corresponding detectable signal 6 with the spacing d of self with electronic tag 20, and this detectable signal 6 is parameters of this spacing d.This closely detecting sensor 4 can detect distance with color or optical sensor.Preferably, this closely detects sensing unit 4 and is arranged on the central spot of the radiation field of this antenna element 3.This closely detecting sensor 4 can in the time of a setting value of this spacing d, provide effective signal.Preferably, the setting value of this spacing d is no more than 5 centimetres, that is to say, this closely effective detection space of detecting sensor 4 be 5 centimetres-0 centimetre.
Referring to Fig. 2, this rfid system is initiatively to initiate (referring to step S1) to this electronic tag 20 by this main control unit 1, when detecting sensor 4 has closely detected that electronic tag 20(is referring to step S2) while entering in effective range (referring to step S3), main control unit 1 is opened radio frequency unit according to the transmitting field intensity of a setting intensity (referring to step S4), when electronic tag 20 moves up and down in effective range, closely detecting sensor 4 can Real-time Feedback spacing d parameter, main control unit 1 can be adjusted the transmitting field intensity of radio frequency unit in real time according to the spacing d parameter of feedback.This method, can guarantee to greatest extent that the field intensity that the optional position of electronic tag 20 within effective spacing d receives is basically identical, thereby promote stability, reliability that electronic tag 20 is read and write.And, according to the method for the feedback dynamic adjustments transmitting field intensity of spacing d parameter, the method for relatively constant transmitting field intensity, and can save power consumption.
Above, only, for the present invention's preferred embodiment, be intended to further illustrate the present invention, but not it is limited.All simple replacements of carrying out according to above-mentioned word and the disclosed content of accompanying drawing, all at the row of the rights protection scope of this patent.
Claims (10)
1. a rfid system, a radio frequency unit that comprise a main control unit, is electrically connected with this main control unit and the antenna element being electrically connected with this radio frequency unit, this rfid system is that read head initiatively wakes label type up; It is characterized in that, this rfid system also comprise be electrically connected with this main control unit one closely detect sensing unit, this closely detect sensing unit be can sensing one electronic tag a spacing between own and the detectable signal that provides, this detectable signal is the parameter of this spacing; This main control unit starts this radio frequency unit transmitting one and sets the transmitting field intensity of intensity in the time that this detectable signal is crossed over a setting threshold, and regulates the transmitting field intensity of this radio frequency unit in the variation according to this detectable signal subsequently.
2. rfid system according to claim 1, is characterized in that: this closely detects sensing unit color or optical sensor detects distance.
3. rfid system according to claim 1, is characterized in that: this closely detects sensing unit and be arranged on the central spot of the radiation field of this antenna element.
4. rfid system according to claim 1, is characterized in that: this setting threshold is corresponding with a setting value of this spacing.
5. rfid system according to claim 4, is characterized in that: the setting value of this spacing is no more than 5 centimetres.
6. the method for the automatic adjusting transmitting field intensity of a rfid system, this rfid system comprises a main control unit, the radio frequency unit being electrically connected with this main control unit and the antenna element being electrically connected with this radio frequency unit, and this rfid system is that read head initiatively wakes label type up; It is characterized in that, what this rfid system is also comprised be electrically connected with this main control unit one closely detects sensing unit, make this closely detect sensing unit be can sensing one electronic tag a spacing between own and the detectable signal that provides, this detectable signal is the parameter of this spacing; Make this main control unit in the time that this detectable signal is crossed over a setting threshold, start this radio frequency unit transmitting one and set the transmitting field intensity of intensity, and regulate the transmitting field intensity of this radio frequency unit in the variation according to this detectable signal subsequently.
7. method according to claim 6, is characterized in that: make this closely detect sensing unit color or optical sensor detects distance.
8. method according to claim 6, is characterized in that: make this closely detect sensing unit and be arranged on the central spot of the radiation field of this antenna element.
9. method according to claim 6, is characterized in that: make this setting threshold corresponding with a setting value of this spacing.
10. method according to claim 9, is characterized in that: make the setting value of this spacing be no more than 5 centimetres.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310189582.8A CN103778396B (en) | 2013-05-21 | 2013-05-21 | RFID system and method for automatically adjusting emission field intensity thereof |
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| CN201310189582.8A CN103778396B (en) | 2013-05-21 | 2013-05-21 | RFID system and method for automatically adjusting emission field intensity thereof |
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| CN103778396B CN103778396B (en) | 2017-02-08 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104794506A (en) * | 2015-04-14 | 2015-07-22 | 天津七一二通信广播有限公司 | Internet-of-Things terminal capable of automatically adjusting transmission power by means of laser ranging |
| CN108597098A (en) * | 2018-03-07 | 2018-09-28 | 深圳市新国都支付技术有限公司 | A kind of RFID transmitters power-economizing method, device and POS machine |
| WO2019104477A1 (en) * | 2017-11-28 | 2019-06-06 | 合肥美的智能科技有限公司 | Refrigerator, and food positioning apparatus for refrigerator |
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| CN101167082A (en) * | 2005-04-28 | 2008-04-23 | 吉莱特公司 | RFID tag sensitivity |
| CN101539625A (en) * | 2008-03-17 | 2009-09-23 | 富士通株式会社 | Testing device |
| CN101714696A (en) * | 2008-09-30 | 2010-05-26 | 富士通株式会社 | Antenna and reader/writer device |
| JP2011132016A (en) * | 2009-12-25 | 2011-07-07 | Maxell Seiki Kk | Carrier position determining device and method of determining position of carrier |
| CN202523081U (en) * | 2011-12-29 | 2012-11-07 | 海能达通信股份有限公司 | RFID system, night patrol system, night patrol machine and label device |
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2013
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101167082A (en) * | 2005-04-28 | 2008-04-23 | 吉莱特公司 | RFID tag sensitivity |
| CN101539625A (en) * | 2008-03-17 | 2009-09-23 | 富士通株式会社 | Testing device |
| CN101714696A (en) * | 2008-09-30 | 2010-05-26 | 富士通株式会社 | Antenna and reader/writer device |
| JP2011132016A (en) * | 2009-12-25 | 2011-07-07 | Maxell Seiki Kk | Carrier position determining device and method of determining position of carrier |
| CN202523081U (en) * | 2011-12-29 | 2012-11-07 | 海能达通信股份有限公司 | RFID system, night patrol system, night patrol machine and label device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104794506A (en) * | 2015-04-14 | 2015-07-22 | 天津七一二通信广播有限公司 | Internet-of-Things terminal capable of automatically adjusting transmission power by means of laser ranging |
| CN104794506B (en) * | 2015-04-14 | 2017-11-14 | 天津七一二通信广播股份有限公司 | It is a kind of using laser ranging can adjust automatically transmission power internet-of-things terminal |
| WO2019104477A1 (en) * | 2017-11-28 | 2019-06-06 | 合肥美的智能科技有限公司 | Refrigerator, and food positioning apparatus for refrigerator |
| CN108597098A (en) * | 2018-03-07 | 2018-09-28 | 深圳市新国都支付技术有限公司 | A kind of RFID transmitters power-economizing method, device and POS machine |
| CN108597098B (en) * | 2018-03-07 | 2021-07-06 | 深圳市新国都支付技术有限公司 | Energy-saving method and device for RFID (radio frequency identification) emitter and POS (point of sale) machine |
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| CN103778396B (en) | 2017-02-08 |
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