CN103778396B - 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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- CN103778396B CN103778396B CN201310189582.8A CN201310189582A CN103778396B CN 103778396 B CN103778396 B CN 103778396B CN 201310189582 A CN201310189582 A CN 201310189582A CN 103778396 B CN103778396 B CN 103778396B
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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 with rfid system automatically adjust transmitting field intensity technology relevant.
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 controlled by this main control unit, and send the radiofrequency signal setting intensity, the electronic tag being in a set point can be written and read operate by the radiation of this antenna element.This structure, in order to ensure the effective read-write in set point, generally requires radio frequency unit and is continuously maintained in emission state, power consumption is larger, both wasted the energy, also resulted in radio-frequency pollution.For this, there has been proposed the improvement of the intensity of the radiofrequency signal launched with adaptively adjustment unit according to the relative position of electronic tag relative antenna unit, as Chinese patent CN201110132180.5 discloses a kind of method of the Intelligent adjustment communication distance identifying rfid system for active rfid, based on the active rfid identification rfid system including label and read write line；Described read write line includes microcontroller MCU, electrically connects adjustable radio frequency front end, fixed RF front end and the host computer communication interface of this microcontroller MCU；Described adjustable radio frequency front end also electrically connects for implementing to adjust the signal conditioner of radio frequency power output and radio frequency reception sensitivity；Methods described comprises the steps：A. the fixed RF front end of described label and described read write line is set up Radio-Frequency Wireless Communication and is linked；B., when the type that described label judges described read write line supports Intelligent adjustment communication distance pattern, carry out subsequent step C to step D；C. described label and the adjustable radio frequency front end of described read write line set up communication linkage；D. the signal conditioner by described read write line adjusts radio frequency power output and the radio frequency reception sensitivity of radio-frequency front-end, makes described label and read write line be operated on the optimal distance.This active RFID system is to be matched with an original fixed RF front end by setting up an adjustable radio frequency front end, to realize RF signal strength in conjunction with corresponding software to adjust according to electronic tag and the distance of antenna, to save power consumption, due to needing extraly to set up an adjustable radio frequency front end, complexity and the cost of system can be increased, and it is also more complicated to reach the method for function.It can be seen that, it is necessary in fact existing active RFID system is further improved.
Content of the invention
Present invention is primarily targeted at providing a kind of rfid system, can realize automatically adjusting transmitting field intensity with relatively simple, lower cost and easier method.
To achieve these goals, the present invention proposes a kind of rfid system, the radio frequency unit electrically connecting including a main control unit and the antenna element electrically connecting with this radio frequency unit with this main control unit, and this rfid system is that read head actively wakes up label type；What this rfid system also included electrically connecting with this main control unit one closely detects sensing unit, this closely detects that sensing unit is the detectable signal that can sense a spacing between oneself for the electronic tag and provide, and 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 when this detectable signal crosses over a given threshold, and is subsequently adjusting the transmitting field intensity that this radio frequency unit is launched according to the change of this detectable signal.This rfid system structure, it is possible to achieve any point in the distance range setting, all ensures that the field intensity that electronic tag receives is consistent.
This closely detects that sensing unit is to carry out detecting distance using color or optical sensor.
This closely detects that sensing unit is provided in the central spot of the radiation field of this antenna element.
This given 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 method that rfid system automatically adjusts transmitting field intensity, this rfid system includes a radio frequency unit and the antenna element electrically connecting with this radio frequency unit that a main control unit is electrically connected with this main control unit, and this rfid system is that read head actively wakes up label type；This rfid system also includes electrically connecting with this main control unit one is made closely to detect sensing unit, this is made closely to detect that sensing unit is the detectable signal that can sense a spacing between oneself for the electronic tag and provide, this detectable signal is the parameter of this spacing；Make this main control unit start the transmitting field intensity of this radio frequency unit transmitting one setting intensity when this detectable signal crosses over a given threshold, and subsequently adjust the transmitting field intensity that this radio frequency unit is launched according to the change of this detectable signal.
Compared with prior art, the rfid system of the present invention and its method automatically adjusting transmitting field intensity, by dexterously arranging the detectable signal closely detecting sensing unit and can changing with the spacing of itself with electronic tag to main control unit offer, so that this main control unit correspondingly adjusts the transmitting field intensity launched of radio frequency unit, structure is simpler, cost is relatively low, and implementation method is easy.
Brief description
Fig. 1 is the structured flowchart of the rfid system embodiment of the present invention.
Fig. 2 is the operation principle flow chart of the 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 element 4 closely detects sensing unit 6 detectable signal, 7 control signal, 8 radiofrequency signal 20 electronic tag d spacing.
Specific embodiment
Construction and feature in order to describe the present invention in detail are located, and hereby lift preferred embodiments below and coordinate brief description as follows.
Referring to Fig. 1, the rfid system embodiment of the present invention generally comprises：An antenna element 3 that the radio frequency unit 2 that one main control unit 1 is electrically connected with this main control unit 1 is electrically connected with this radio frequency unit 2 and electrically connect with this main control unit 1 one closely detect sensing unit 4.This rfid system is that read head actively wakes up label type.
This main control unit 1 includes microprocessor, for capturing the detectable signal 6 that this closely detects that sensing unit 4 provides and sending control signal 7 to this radio frequency unit 2.
This radio frequency unit 2 includes RF transceiver circuit, can be according to the intensity of control signal 7 radio frequency that it is launched come dynamic regulation of this main control unit 1.
This antenna element 3, is matched with this radio frequency unit 2, the radiofrequency signal 8 of Strength Changes can be converted to the radiation field of intensity transformation, to match with electronic tag 20.
This closely detection sensor 4, can be changed with spacing d of itself with electronic tag 20 and provide corresponding detectable signal 6, this detectable signal 6 is the parameter of this spacing d.This closely detection sensor 4 can be to carry out detecting distance using color or optical sensor.Preferably, this closely detects that sensing unit 4 is provided in the central spot of the radiation field of this antenna element 3.This closely detection sensor 4 can provide effective signal in a setting value of this spacing d.Preferably, the setting value of this spacing d be no more than 5 centimetres that is to say, that this closely detection sensor 4 effective detection space be 5 centimetres -0 centimetre.
Referring to Fig. 2, this rfid system is to be initiated from this main control unit 1 active to this electronic tag 20（Referring to step S1）, when closely detection sensor 4 has detected electronic tag 20（Referring to step S2）Enter effective range（Referring to step S3）Within when, main control unit 1 open radio frequency unit according to one setting intensity transmitting field intensity（Referring to step S4）, when electronic tag 20 moves up and down in effective range, closely detection sensor 4 can with Real-time Feedback spacing d parameter, main control unit 1 according to feedback spacing d parameter can real-time adjustment radio frequency unit transmitting field intensity.This method, can ensure that the field intensity that optional position within effective spacing d for the electronic tag 20 receives is basically identical to greatest extent, thus lifting the stability of electronic tag 20 read-write, reliability.And, the method for the feedback dynamic-adjusting transmission field intensity according to spacing d parameter, the method for the transmitting field intensity of relative constancy, and power consumption can be saved.
More than, only the preferred embodiments of the invention is it is intended that further illustrate the present invention, rather than it is defined.All simple replacements being carried out according to above-mentioned word and accompanying drawing disclosure of that, all in the row of the rights protection scope of this patent.
Claims (10)
1. a kind of rfid system, the radio frequency unit electrically connecting with this main control unit including a main control unit and the antenna element electrically connecting with this radio frequency unit, this rfid system is that read head actively wakes up label type；It is characterized in that, what this rfid system also included electrically connecting with this main control unit one closely detects sensing unit, this closely detects that sensing unit is the detectable signal that can sense a spacing between oneself for the electronic tag and provide, and 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 when this detectable signal crosses over a given threshold, and is subsequently adjusting the transmitting field intensity of this radio frequency unit according to the change of this detectable signal.
2. rfid system according to claim 1 it is characterised in that：This closely detects that sensing unit is to carry out detecting distance using color or optical sensor.
3. rfid system according to claim 1 it is characterised in that：This closely detects that sensing unit is provided in the central spot of the radiation field of this antenna element.
4. rfid system according to claim 1 it is characterised in that：This given threshold is corresponding with a setting value of this spacing.
5. rfid system according to claim 4 it is characterised in that：The setting value of this spacing is no more than 5 centimetres.
6. a kind of method automatically adjusting transmitting field intensity of rfid system, this rfid system includes a radio frequency unit and the antenna element electrically connecting with this radio frequency unit that a main control unit is electrically connected with this main control unit, and this rfid system is that read head actively wakes up label type；It is characterized in that, this rfid system also includes electrically connecting with this main control unit one is made closely to detect sensing unit, this is made closely to detect that sensing unit is the detectable signal that can sense a spacing between oneself for the electronic tag and provide, this detectable signal is the parameter of this spacing；Make this main control unit start the transmitting field intensity of this radio frequency unit transmitting one setting intensity when this detectable signal crosses over a given threshold, and subsequently adjust the transmitting field intensity of this radio frequency unit according to the change of this detectable signal.
7. method according to claim 6 it is characterised in that：This is made closely to detect that sensing unit is to carry out detecting distance using color or optical sensor.
8. method according to claim 6 it is characterised in that：This is made closely to detect that sensing unit is provided in the central spot of the radiation field of this antenna element.
9. method according to claim 6 it is characterised in that：Make this given threshold corresponding with a setting value of this spacing.
10. method according to claim 9 it is characterised in that：The setting value of this spacing is made to be no more than 5 centimetres.
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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 true CN103778396B (en) | 2017-02-08 |
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| 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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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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 |
| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5424255B2 (en) * | 2009-12-25 | 2014-02-26 | 日立マクセル株式会社 | Conveyance posture determination apparatus and posture determination method |
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Patent Citations (4)
| 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 |
| 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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