CN202956766U - Radio frequency tag detection device - Google Patents
Radio frequency tag detection device Download PDFInfo
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- CN202956766U CN202956766U CN 201220680669 CN201220680669U CN202956766U CN 202956766 U CN202956766 U CN 202956766U CN 201220680669 CN201220680669 CN 201220680669 CN 201220680669 U CN201220680669 U CN 201220680669U CN 202956766 U CN202956766 U CN 202956766U
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Abstract
The utility model relates to a radio frequency tag detection device. The radio frequency tag detection device comprises an antenna, a discharging loop, an antenna monitoring circuit, a signal amplification circuit and a signal processing circuit, wherein the antenna comprises a vibrating capacitor, a vibrating inductor and an antenna grounding switch, which are sequentially coupled; the discharging loop comprises a discharging switch which couples the vibrating inductor to the ground; the antenna monitoring circuit is used for receiving a wireless signal which is received by the antenna, and controlling the turn-on and turn-off of the antenna grounding switch and the discharging switch according to the states of the antenna and the discharging loop; the signal amplification circuit is used for outputting alternating current to drive the antenna to send the wireless signal; and the signal processing circuit is coupled to the antenna monitoring circuit and used for receiving and processing the wireless signal which is received by the antenna.
Description
Technical field
The utility model relates to a kind of radio-frequency (RF) tag pick-up unit.
Background technology
Now, radio-frequency (RF) tag, especially passive RF label are widely used in various facilities managements field, for example, and at the management domain of gas ductwork.For example, but, because outdoor condition is comparatively complicated,, label and radio-frequency (RF) tag checkout equipment have certain distance at least, and disturb morely, the passive RF label pick-up unit is subject to environmental constraints and interference, the detection effect that more difficult realization is good.
The utility model content
Technical problem to be solved in the utility model is that a kind of radio-frequency (RF) tag pick-up unit and detection method thereof that can obtain better detection effect is provided.
At first the utility model provides a kind of radio-frequency (RF) tag pick-up unit, comprising:
Antenna comprises: the concussion electric capacity be coupled successively, concussion inductance and antenna earthing switch;
Discharge loop comprises: the discharge switch that described concussion is inductively coupled to ground;
The antenna supervisory circuit, the wireless signal of receiving for receiving described antenna, and, according to the state of described antenna and discharge loop, control the break-make of described antenna earthing switch and discharge switch;
Signal amplification circuit, drive described antenna to send wireless signal for exporting exchange current; And,
Signal processing circuit, be coupled in described antenna supervisory circuit, the wireless signal of receiving for receiving and process described antenna.
Corresponding the utility model also provides a kind of detection method that adopts described radio-frequency (RF) tag pick-up unit, comprises the steps:
Actuation step: described discharge switch disconnects, described antenna earthing switch closure, and described signal amplification circuit sends the exchange current of predeterminated frequency, to drive described antenna to send wireless signal, if any outside radio-frequency (RF) tag, make outside radio-frequency (RF) tag resonance, induced current storage power;
Discharge step: described signal amplification circuit stops sending the exchange current of predeterminated frequency, disconnects described antenna earthing switch, closed described discharge switch;
Receiving step: the signal that the resonance of the radio-frequency (RF) tag of described antenna reception outside is sent, and be sent to described signal processing circuit and processed.
Adopt technique scheme, compared with prior art its advantage is:
At first, the process of whole identification label is divided and makes three steps:
1) in actuation step, antenna is the LC series resonant circuit, by signal amplification circuit, provides current drives, forms alternating magnetic field in space.If there is radio-frequency (RF) tag in space, radio-frequency (RF) tag can be energized with antenna and produce resonance energy storage.The LC series resonant circuit can optimum launch energy.
When 2) resonance acquires a certain degree, stop alternating magnetic field, antenna is set to antiresonant circuit and connects discharge loop.Now radio-frequency (RF) tag maintains damped vibration by complementary energy.And antenna stops vibration because being discharged loop absorption complementary energy.
3) disconnect discharge loop, label is also being done damped vibration, and the magnetic field that now label forms can form resonance by the flyback antenna.The amplitude showed on antenna by detecting this resonance, can detect label range finding.Now, antenna is the LC antiresonant circuit.
The characteristics of technique scheme comprise, a mistiming is set dexterously, make antenna and radio-frequency (RF) tag resonate and realize that twice energy shifts the formation corresponding relation and realize detecting by magnetic induction.Radio-frequency (RF) tag is only used the LC resonant circuit structure of the low load of class corresponding with the antenna resonance parameter.Magnetic induction resonance has strict frequency relation, effectively reduces other frequency and crosstalks.Antenna produces alternating magnetic field and excites tag resonates and label flyback to send out antenna twice energy that resonate to shift obvious separation is arranged on time and electrical structure, effectively reduce internal interference.
So this label detection and location technology has good measurement signal to noise ratio (S/N ratio) and accuracy, can realize a kind of range finding of tag location cheaply application.
Preferably, described discharge switch and antenna earthing switch select respectively to adopt metal-oxide-semiconductor.
Certainly, other embodiment also can select to adopt other electric or electronic switches.
Further, described discharge loop also comprises: the diode that is coupled in series with described discharge switch; The positive pole of this diode is coupled in described concussion inductance.
Preferably, described radio-frequency (RF) tag pick-up unit also comprises:
Microprocessor, for controlling respectively described signal amplification circuit, antenna supervisory circuit and signal processing circuit.
Preferably, described actuation step, discharge step and receiving step circulate successively.
The accompanying drawing explanation
Fig. 1 is the structured flowchart of a kind of embodiment of the utility model radio-frequency (RF) tag pick-up unit;
Fig. 2 is the structured flowchart of the another kind of embodiment of the utility model radio-frequency (RF) tag pick-up unit;
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further.
As shown in Figure 1, a kind of radio-frequency (RF) tag pick-up unit comprises:
Antenna comprises: the concussion electric capacity be coupled successively, concussion inductance and antenna earthing switch;
Discharge loop comprises: the discharge switch that described concussion is inductively coupled to ground;
The antenna supervisory circuit, the wireless signal of receiving for receiving described antenna, and, according to the state of described antenna and discharge loop, control the break-make of described antenna earthing switch and discharge switch;
Signal amplification circuit, drive described antenna to send wireless signal for exporting exchange current; And
Signal processing circuit, be coupled in described antenna supervisory circuit, the wireless signal of receiving for receiving and process described antenna.
Accordingly, adopt the detection method of described radio-frequency (RF) tag pick-up unit, comprise the steps:
Actuation step: described discharge switch disconnects, described antenna earthing switch closure, and described signal amplification circuit sends the exchange current of predeterminated frequency, to drive described antenna to send wireless signal, if any outside radio-frequency (RF) tag, make outside radio-frequency (RF) tag resonance, induced current storage power;
Discharge step: described signal amplification circuit stops sending the exchange current of predeterminated frequency, disconnects described antenna earthing switch, closed described discharge switch;
Receiving step: the signal that the resonance of the radio-frequency (RF) tag of described antenna reception outside is sent, and be sent to described signal processing circuit and processed.
Below, with one more specifically embodiment describe.
In actuation step, described signal amplification circuit can be selected to adopt with the PWM frequency, and the single-chip microcomputer that for example adopts internal control is to frequency out, alternately receive power supply (+Vcc) and (GND), produce AC drive voltage, produce the signal source of driven antenna.
Antenna earthing switch closure in described antenna, antenna ground.And disconnect the discharge loop switch, and being equivalent to access an element that impedance is very large, substantially can't release energy by discharge loop.
And the impedance of the signal output part electric capacity of described antenna is much larger than the concussion inductance of antenna and concussion electric capacity, thus the electric current of signal source output mainly by concussion inductance and the concussion electric capacity of antenna, the main task that makes antenna is to produce magnetic field.
In discharge step, described signal amplification circuit can be chosen as ground connection (GND), be equivalent to stop output pwm signal, then, described discharge loop is connected, and the grounding switch of antenna disconnects simultaneously, be equivalent to access a very big impedance, described concussion inductance now releases energy by discharge loop fast over the ground, and the energy of concussion electric capacity can't also flow away by the release of concussion inductance in discharge loop, so the loop of concussion inductance and concussion electric capacity stops rapidly resonance.And now described antenna is the LC parallel circuit.
In receiving step, described signal amplification circuit can be chosen as ground connection, and described antenna is the LC parallel circuit.Disconnect described discharge loop, described antenna is by the magnetic field flyback of radio-frequency (RF) tag.
The antenna supervisory circuit can adopt the output terminal that is capacitively coupled to described antenna, whole states of the three phases of its output signal reflection antenna.
Like this, the signal of reception can minimizedly be subject to the impact of antenna self concussion, and in general the LC series circuit more easily shakes and sends energy, the in general more acceptant concussion of LC parallel circuit.Can increase substantially like this sensitivity of detection and detect distance.
As shown in Figure 2, with embodiment illustrated in fig. 1, compare, it also comprises: for controlling respectively the microprocessor of described signal amplification circuit, antenna supervisory circuit and signal processing circuit.
In general, in the radio-frequency (RF) tag pick-up unit, each several part adopts corresponding module itself just can have certain processing power, can come various status signals are processed, and send corresponding control signal.And, in this embodiment, will increase a microprocessor to process accordingly, this microprocessor for example can select to adopt single-chip microcomputer.
Wherein, described discharge switch and antenna earthing switch select respectively to adopt metal-oxide-semiconductor.
Described discharge loop also comprises: the diode that is coupled in series with described discharge switch; The positive pole of this diode is coupled in described concussion inductance.
Above content is further detailed description of the utility model in conjunction with specific embodiments, can not assert that concrete enforcement of the present utility model is confined to these explanations.For the utility model person of an ordinary skill in the technical field, without departing from the concept of the premise utility, can also make some simple deduction or replace, all should be considered as belonging to protection domain of the present utility model.
Claims (4)
1. a radio-frequency (RF) tag pick-up unit, is characterized in that, comprising:
Antenna comprises: the concussion electric capacity be coupled successively, concussion inductance and antenna earthing switch;
Discharge loop comprises: the discharge switch that described concussion is inductively coupled to ground;
The antenna supervisory circuit, the wireless signal of receiving for receiving described antenna, and, according to the state of described antenna and discharge loop, control the break-make of described antenna earthing switch and discharge switch;
Signal amplification circuit, drive described antenna to send wireless signal for exporting exchange current; And
Signal processing circuit, be coupled in described antenna supervisory circuit, the wireless signal of receiving for receiving and process described antenna.
2. radio-frequency (RF) tag pick-up unit as claimed in claim 1, is characterized in that, described discharge switch and antenna earthing switch select respectively to adopt metal-oxide-semiconductor.
3. radio-frequency (RF) tag pick-up unit as claimed in claim 2, is characterized in that, described discharge loop also comprises: the diode that is coupled in series with described discharge switch; The positive pole of this diode is coupled in described concussion inductance.
4. radio-frequency (RF) tag pick-up unit as claimed in claim 1, is characterized in that, also comprises:
Microprocessor, for controlling respectively described signal amplification circuit, antenna supervisory circuit and signal processing circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220680669 CN202956766U (en) | 2012-12-10 | 2012-12-10 | Radio frequency tag detection device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220680669 CN202956766U (en) | 2012-12-10 | 2012-12-10 | Radio frequency tag detection device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202956766U true CN202956766U (en) | 2013-05-29 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220680669 Expired - Fee Related CN202956766U (en) | 2012-12-10 | 2012-12-10 | Radio frequency tag detection device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202956766U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103034827A (en) * | 2012-12-10 | 2013-04-10 | 肖蕾 | Radio frequency tag detecting device and detecting method thereof |
-
2012
- 2012-12-10 CN CN 201220680669 patent/CN202956766U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103034827A (en) * | 2012-12-10 | 2013-04-10 | 肖蕾 | Radio frequency tag detecting device and detecting method thereof |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: HANGZHOU HANGRUN TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: XIAO LEI Effective date: 20131210 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 510410 GUANGZHOU, GUANGDONG PROVINCE TO: 310019 HANGZHOU, ZHEJIANG PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20131210 Address after: 310019, room 1, building 24, building 9, nine Sheng Road, 1093, Zhejiang, Jianggan District, Hangzhou, China Patentee after: Hangzhou Hangrun Technology Co., Ltd. Address before: 510410. 3, 3 Street, 304 North District, Xincheng overseas Chinese town, Baiyun District, Guangdong, Guangzhou Patentee before: Xiao Lei |
|
| DD01 | Delivery of document by public notice |
Addressee: Xiao Lei Document name: Notification of Passing Examination on Formalities |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20180608 Address after: 311106 No. 268 Tangkang Road, Tangqi Town, Yuhang District, Hangzhou, Zhejiang. Patentee after: Hangzhou Dehao Huanbao Cailiao Co., Ltd. Address before: 310019 1093 building, 1 building, 24 9, nine Sheng Road, Jianggan District, Hangzhou, Zhejiang. Patentee before: Hangzhou Hangrun Technology Co., Ltd. |
|
| TR01 | Transfer of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130529 Termination date: 20191210 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |