CN102880845B - Radio frequency module for detecting RFID (Radio Frequency Identification Device) label and control method of radio frequency module - Google Patents
Radio frequency module for detecting RFID (Radio Frequency Identification Device) label and control method of radio frequency module Download PDFInfo
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- CN102880845B CN102880845B CN201210321389.0A CN201210321389A CN102880845B CN 102880845 B CN102880845 B CN 102880845B CN 201210321389 A CN201210321389 A CN 201210321389A CN 102880845 B CN102880845 B CN 102880845B
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Abstract
The invention relates to a radio frequency module for detecting an RFID (Radio Frequency Identification Device) label and a control method of the radio frequency module. The radio frequency module comprises an antenna drive unit for emitting a drive signal with a specific frequency, an antenna unit for being driven by the antenna drive unit to vibrate for emitting a wireless signal, a phase comparison unit for comparing a phase difference between the drive signal output by the antenna drive unit and the wireless signal output by the antenna unit, a compensation unit for adjusting the vibration parameters of the antenna unit so as to adjust the frequency of the wireless signal output by the wireless unit, and a control unit for controlling the compensation unit and the antenna drive unit respectively according to a comparison value output by the phase comparison unit.
Description
Technical field
The present invention relates to a kind of radio frequency module for detecting RFID label tag and control method thereof.
Background technology
Now, RFID tag (RFID) is widely used in every field.In a lot of special engineered field, such as, in pipeline maintenance, line upkeep, employ RFID label tag in a large number.Further, in order to needs easy to maintenance, in general, the RFID label tag of laying adopts passive form mostly.But the RFID label tag of passive type relies on the energy received from transmitting terminal, and could to greatest extent to RF tag transmission energy when system enters resonant condition.And for reading the equipment of radio frequency module, its transmission frequency being easily subject to the interference of environment, producing drift, so just having had a strong impact on the detection of radio frequency label.
Summary of the invention
Technical matters to be solved by this invention is, how to overcome the frequency drift that produces time checkout equipment detects RFID label tag, affects the effect of itself and RFID label tag resonance, and then affects the problem of its accuracy of detection.
In view of this, the invention provides a kind of radio frequency module for detecting RFID label tag, comprising:
Antenna driver element, for sending the drive singal of characteristic frequency;
Antenna element, sends wireless signal for being shaken by described antenna drive unit drives;
Phase comparison unit, exports the phase differential of wireless signal for more described antenna driver element output drive signal and described antenna element;
Compensating unit, for adjusting the concussion parameter of described antenna element, to adjust the frequency that described antenna element exports wireless signal; And,
Control module, for the fiducial value exported according to described phase comparison unit, controls described compensating unit and described antenna driver element respectively.
Accordingly, the present invention also provides a kind of control method adopting the described radio frequency module for detecting RFID label tag, comprises the steps:
Predeterminated frequency step: predeterminated frequency is driving frequency by described antenna driver element, drives described antenna element to send wireless signal;
Comparison step: more described driving frequency and described antenna element send the phase differential of the transmission frequency of wireless signal;
Treatment step: if the phase differential of described driving frequency and transmission frequency is non-vanishing, then this transmission frequency is set as driving frequency by described antenna driver element, drives described antenna element to send wireless signal; If the phase differential of described driving frequency and transmission frequency is zero, then compare this transmission frequency and described predeterminated frequency, as unequal, then control the concussion parameter that described compensating unit adjusts described antenna element, until this transmission frequency is equal with described predeterminated frequency.
Wherein, above-mentionedly relate to both and compare, " equal " or " being zero ", and not necessarily refers to that both are strictly equal, but also comprise, under real-world environment, both differences are within the scope of acceptable.
The concussion parameter of antenna element, comprises its capacitance, inductance value and resistance value, under the driving of the drive singal of outside, generation is shaken, sends wireless signal.If change above-mentioned capacitance, inductance value and resistance value, just can change its send the transmission frequency of wireless signal.
In general, the natural frequency of RFID label tag is predeterminated frequency, this value is known in advance, and change is very little, and for the transmission frequency of the radio frequency module that detects RFID label tag, due to the impact of environment or equipment, be difficult to necessarily arrive predeterminated frequency accurately, be difficult to like this realize resonance, obtain best Detection results.Technique scheme of the present invention provides a kind of control method, comprises two circulations, and circulation is the adjustment to driving frequency, and another circulation adjusts transmission frequency, and two circulations act on simultaneously, follow accurate predeterminated frequency to make transmission frequency fast.The resonance realizing RFID label tag and radio frequency module that like this can be best, realizes best Detection results.
Meanwhile, technical scheme of the present invention, is not limited to detect passive RFID tags, is equally applicable to active RFID tag.
Preferably, described compensating unit comprises:
Controlled capacitance matrix, is interconnected by multiple electric capacity and forms array, and be coupled with described antenna element; And,
Electric-controlled switch, is controlled by described control module, obtains different capacitance to select described controlled capacitance matrix.
In general, capacitance is the concussion parameter the most easily adjusted.
Preferably, described control module comprises:
Phase-locked loop circuit, for receive and process described phase comparison unit export phase information.
Preferably, described control module comprises:
Temperature sensor, for obtaining the temperature of described antenna element.
Experience, produces parameter mainly temperature to the drift of transmission frequency in external environment condition.
Preferably, in described treatment step,
As this transmission frequency and as described in predeterminated frequency unequal, then environmentally parameter and both differences above-mentioned, control the concussion parameter that described compensating unit adjusts described antenna element, until this transmission frequency is equal with described predeterminated frequency.
Wherein, environmental parameter, comprises temperature information, humidity information etc., and these parameters can have an impact to the drift of transmission frequency, can carry out the control module of data processing, can rule of thumb data, adjusts offset.
Accompanying drawing explanation
Fig. 1 is that the present invention is for detecting the structured flowchart of a kind of embodiment of radio frequency module of RFID label tag;
Fig. 2 is lower one embodiment illustrated in fig. 1 more specifically hardware effort process schematic in embodiment.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described further.
As shown in Figure 1, a kind of radio frequency module for detecting RFID label tag, comprising:
Antenna driver element, for sending the drive singal of characteristic frequency;
Antenna element, sends wireless signal for being shaken by described antenna drive unit drives;
Phase comparison unit, exports the phase differential of wireless signal for more described antenna driver element output drive signal and described antenna element;
Compensating unit, for adjusting the concussion parameter of described antenna element, to adjust the frequency that described antenna element exports wireless signal; And,
Control module, for the fiducial value exported according to described phase comparison unit, controls described compensating unit and described antenna driver element respectively.
Shown in composition graphs 1, Fig. 2 is hardware effort process schematic in a kind of specific embodiment further.
For the radio frequency module for detecting RFID label tag, wherein,
Described compensating unit comprises:
Controlled capacitance matrix, is interconnected by multiple electric capacity and forms array, and be coupled with described antenna element; And,
Electric-controlled switch, is controlled by described control module, obtains different capacitance to select described controlled capacitance matrix.
Described control module comprises:
Phase-locked loop circuit, for receive and process described phase comparison unit export phase information.
Described control module comprises:
Temperature sensor, for obtaining the temperature of described antenna element.
Accordingly, for detecting the control method of the radio frequency module of RFID label tag, comprise the steps:
Predeterminated frequency step: predeterminated frequency is driving frequency by described antenna driver element, drives described antenna element to send wireless signal;
Comparison step: more described driving frequency and described antenna element send the phase differential of the transmission frequency of wireless signal;
Treatment step: if the phase differential of described driving frequency and transmission frequency is non-vanishing, then this transmission frequency is set as driving frequency by described antenna driver element, drives described antenna element to send wireless signal; If the phase differential of described driving frequency and transmission frequency is zero, then compare this transmission frequency and described predeterminated frequency, as unequal, then control the concussion parameter that described compensating unit adjusts described antenna element, until this transmission frequency is equal with described predeterminated frequency.
Wherein, in described treatment step,
As this transmission frequency and as described in predeterminated frequency unequal, then according to temperature value and this transmission frequency and the described predeterminated frequency difference of described antenna element, control the concussion parameter that described compensating unit adjusts described antenna element, until this transmission frequency is equal with described predeterminated frequency.
Specifically, because the impact of environment temperature, the transmission frequency P2 of antenna element and the driving frequency P1 of antenna driver element has deviation, then the frequency P1 adjusting antenna driver element makes the deviation trend zero of P1 and P2.
With it simultaneously, measure the driving frequency P1 of antenna driver element and the difference of predeterminated frequency P0, according to the parameter in database and fuzzy algorithm adjustment compensating unit, make the transmission frequency P0 of the frequency P2 trend expection of the antenna element after over-compensation resonant element regulates.The difference of P2 and P1 can trigger rate adjustment unit action again, finally makes P0=P1=P2.
Wherein, in general, expected frequency P0 is set to the natural frequency of RFID label tag.
Above content is further description made for the present invention in conjunction with specific embodiments, can not assert that specific embodiment of the invention is confined to these explanations.For general technical staff of the technical field of the invention, without departing from the inventive concept of the premise, some simple deduction or replace can also be made, all should be considered as belonging to protection scope of the present invention.
Claims (6)
1., for detecting a radio frequency module for RFID label tag, it is characterized in that, comprise:
Antenna driver element, for sending the drive singal of characteristic frequency;
Antenna element, sends wireless signal for being shaken by described antenna drive unit drives; And predeterminated frequency is driving frequency by described antenna driver element, described antenna element is driven to send wireless signal;
Phase comparison unit, exports the phase differential of wireless signal for more described antenna driver element output drive signal and described antenna element;
Compensating unit, for adjusting the concussion parameter of described antenna element, to adjust the frequency that described antenna element exports wireless signal; And,
Control module, for the fiducial value exported according to described phase comparison unit, controls described compensating unit and described antenna driver element respectively; If the phase differential of described driving frequency and transmission frequency is non-vanishing, then this transmission frequency is set as driving frequency by described antenna driver element, drives described antenna element to send wireless signal; If the phase differential of described driving frequency and transmission frequency is zero, then compare this transmission frequency and described predeterminated frequency, as unequal, then control the concussion parameter that described compensating unit adjusts described antenna element, until this transmission frequency is equal with described predeterminated frequency.
2. as claimed in claim 1 for detecting the radio frequency module of RFID label tag, it is characterized in that, described compensating unit comprises:
Controlled capacitance matrix, is interconnected by multiple electric capacity and forms array, and be coupled with described antenna element; And,
Electric-controlled switch, is controlled by described control module, obtains different capacitance to select described controlled capacitance matrix.
3. as claimed in claim 1 for detecting the radio frequency module of RFID label tag, it is characterized in that, described control module comprises:
Phase-locked loop circuit, for receive and process described phase comparison unit export phase information.
4. as claimed in claim 1 for detecting the radio frequency module of RFID label tag, it is characterized in that, described control module comprises:
Temperature sensor, for obtaining the temperature of described antenna element.
5. adopting the control method as the radio frequency module for detecting RFID label tag as described in arbitrary in Claims 1-4, it is characterized in that, comprise the steps:
Predeterminated frequency step: predeterminated frequency is driving frequency by described antenna driver element, drives described antenna element to send wireless signal;
Comparison step: more described driving frequency and described antenna element send the phase differential of the transmission frequency of wireless signal;
Treatment step: if the phase differential of described driving frequency and transmission frequency is non-vanishing, then this transmission frequency is set as driving frequency by described antenna driver element, drives described antenna element to send wireless signal; If the phase differential of described driving frequency and transmission frequency is zero, then compare this transmission frequency and described predeterminated frequency, as unequal, then control the concussion parameter that described compensating unit adjusts described antenna element, until this transmission frequency is equal with described predeterminated frequency.
6. control method as claimed in claim 5, it is characterized in that, in described treatment step, as this transmission frequency and as described in predeterminated frequency unequal, then according to this transmission frequency and described predeterminated frequency difference and environmental parameter, control the concussion parameter that described compensating unit adjusts described antenna element, until this transmission frequency is equal with described predeterminated frequency.
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| CN201210321389.0A CN102880845B (en) | 2012-09-03 | 2012-09-03 | Radio frequency module for detecting RFID (Radio Frequency Identification Device) label and control method of radio frequency module |
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| CN1965324A (en) * | 2004-04-08 | 2007-05-16 | 3M创新有限公司 | Variable frequency radio frequency identification (RFID) tags |
| CN101071469A (en) * | 2006-05-11 | 2007-11-14 | 北京泛在物联科技有限公司 | Radio frequency electronic label reader and its use method |
| CN101361287A (en) * | 2006-09-21 | 2009-02-04 | 三星电子株式会社 | Mobile radio frequency identification (mrfid) reader |
| CN101557227A (en) * | 2009-04-28 | 2009-10-14 | 大连理工大学 | Self-adapting resonance control method for transmitting non-contact electric energy |
| CN102222967A (en) * | 2011-06-17 | 2011-10-19 | 武汉中原电子集团有限公司 | Self-adaptive wireless charging system |
| CN202771434U (en) * | 2012-09-03 | 2013-03-06 | 肖蕾 | Radio frequency module for detecting RFID tag |
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- 2012-09-03 CN CN201210321389.0A patent/CN102880845B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1965324A (en) * | 2004-04-08 | 2007-05-16 | 3M创新有限公司 | Variable frequency radio frequency identification (RFID) tags |
| CN101071469A (en) * | 2006-05-11 | 2007-11-14 | 北京泛在物联科技有限公司 | Radio frequency electronic label reader and its use method |
| CN101361287A (en) * | 2006-09-21 | 2009-02-04 | 三星电子株式会社 | Mobile radio frequency identification (mrfid) reader |
| CN101557227A (en) * | 2009-04-28 | 2009-10-14 | 大连理工大学 | Self-adapting resonance control method for transmitting non-contact electric energy |
| CN102222967A (en) * | 2011-06-17 | 2011-10-19 | 武汉中原电子集团有限公司 | Self-adaptive wireless charging system |
| CN202771434U (en) * | 2012-09-03 | 2013-03-06 | 肖蕾 | Radio frequency module for detecting RFID tag |
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