CN203366368U - Controlled NFC (Near Field Communication) tag - Google Patents
Controlled NFC (Near Field Communication) tag Download PDFInfo
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- CN203366368U CN203366368U CN 201320480558 CN201320480558U CN203366368U CN 203366368 U CN203366368 U CN 203366368U CN 201320480558 CN201320480558 CN 201320480558 CN 201320480558 U CN201320480558 U CN 201320480558U CN 203366368 U CN203366368 U CN 203366368U
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Abstract
The utility model provides a controlled NFC (Near Field Communication) tag which includes an NFC tag body, an electronic switch in parallel connection with an NFC antenna coil in the NFC tag body, and an electronic switch control circuit for generating a switching on/off control signal for the electronic switch. When an enable signal or a disable signal is inputted to an enable / disable signal input end of the electronic switch control circuit, an output end of the electronic switch control circuit correspondingly outputs a switching off control signal or a switching on control signal; the switching off control signal or the switching on control signal is applied to a control end of the electronic switch, so that connection between a first connecting end and a second connecting end of the electronic switch are correspondingly switched off or switched on; and thus electromagnetic energy coupled in an enable or disable NFC antenna coil is transferred to an NFC tag chip. The beneficial effects are that: the reading of the NFC tag chip is conditional so as to avoid the unnecessary operation; and at the same time, the security of the information stored in the NFC tag chip is improved.
Description
Technical field
The utility model relates to wireless near field communication (Near Field Communication, NFC) technical field, specifically, relates to a kind of controlled NFC label.
Background technology
Wireless near field communication (NFC) technology is a kind of short distance high frequency wireless communication technology of getting up from radio-frequency (RF) identification (RFID) technical development.With infrared communication, Bluetooth communication, compare, NFC has taked unique signal attenuation technique, thereby can for example, in very short distance (10cm), communicate.NFC has security natively because communication distance is short, is very suitable for the application scenarios such as identification, secure payment.
The NFC communication facilities has three kinds of mode of operations, i.e. label mode, card reader pattern and ad hoc mode.Label mode claims again mode card, is a kind of Passive Mode.The exemplary that is operated in the NFC communication facilities under label mode is common NFC label.Common NFC label can be stored such as personal information, payment information, Bluetooth address information, WIFI address information etc. for reading, and is suitable for use in the application scenarios such as placard, identification, wireless security payment, Bluetooth pairing, WIFI pairing.The card reader pattern is a kind of aggressive mode, and the NFC communication facilities (for example NFC mobile phone) be operated under the card reader pattern can be read canned data from the NFC label, even information can be write in the NFC label.Ad hoc mode is for exchanges data, and specifically, two NFC communication facilitiess that are operated under ad hoc mode can be realized Point-to-Point Data Transmission, as downloaded music, exchange picture etc.
Fig. 1 is schematic diagram, shows the course of work of common NFC card reader and NFC label.As shown in Figure 1, common NFC label comprises NFC label chip and NFC aerial coil, when the close NFC label of NFC card reader, the NFC card reader is sent electromagnetic energy to the NFC label, be coupled this electromagnetic energy it is delivered in the NFC label chip be connected with the NFC aerial coil of NFC aerial coil on the NFC label, the NFC label chip is converted into this electromagnetic energy by rectification circuit the needed power supplys of circuit such as its inner microcontroller, modulator-demodular unit and storer.While starting working, canned data in the NFC label chip can be sent to the NFC card reader by the NFC aerial coil after the circuit such as described microcontroller, modulator-demodular unit and storer are powering up.
The carrier frequency of using due to NFC is 13.56MHz, and reading/writing distance is very short, and therefore, the coupling scheme of NFC label chip and NFC card reader are magnetic Field Couplings, can use coil as the NFC antenna.
An advantage of common NFC label is that self does not need to be equipped with power supply, can form power supply by the electromagnetic energy that receives the emission of NFC card reader.But also have a problem, that is, as long as the close NFC label of NFC card reader, the NFC label will be activated, and its canned data will send to the NFC card reader automatically.This situation is not wish to occur in some applications.For example, in the bluetooth earphone that common NFC label is housed, the bluetooth earphone unpaired messages such as Bluetooth address are stored in this NFC label, for example, when the electronic equipment that the NFC card reader is housed (NFC mobile phone) when the bluetooth earphone of NFC label is housed, this electronic equipment will read the earphone unpaired messages such as Bluetooth address in the NFC label of this bluetooth earphone by the NFC card reader, thereby is matched with this bluetooth earphone.In this case, even bluetooth earphone in off-mode, needs only described electronic equipment near bluetooth earphone, described electronic equipment still can read the unpaired message in this bluetooth earphone, thereby start Bluetooth protocol, initiatively with this bluetooth earphone, is matched.Certainly, due to bluetooth earphone, now in off-mode, pairing finally can be not successful.Therefore, in some scenarios, the information that the NFC card reader unconditionally reads in the NFC label can cause unnecessary operation, and can affect the security of information.
The utility model content
The utility model is made in order to solve above-mentioned problems of the prior art, its purpose is to provide a kind of controlled NFC label, it is with good conditionsi making reading of NFC label chip, thereby avoid some unnecessary operations, improve the security of the storage information in the NFC label chip simultaneously.
To achieve these goals, the utility model provides a kind of controlled NFC label, and it comprises: the NFC tag body, and this NFC tag body comprises NFC label chip and NFC aerial coil, electronic switch, this electronic switch has the first link, the second link and control end, and described the first link is connected with the two ends of described NFC aerial coil respectively with the second link, and electronic switch control circuit, this electronic switch control circuit has enable/disable signals input end and output terminal, described output terminal is connected with the control end of described electronic switch, wherein, when enable signal or disable signal during from the enable/disable signals input end input of described electronic switch control circuit, the output terminal of described electronic switch control circuit is correspondingly exported and is disconnected control signal or conducting control signal, described disconnection control signal or conducting control signal are applied to the control end of described electronic switch, make correspondingly to disconnect or conducting between the first link of described electronic switch and the second link, thereby the electromagnetic energy that correspondingly enables or forbid being coupled in described NFC aerial coil is to the transmission of described NFC label chip.
Known according to top explanation, in controlled NFC label described in the utility model, owing to being provided with electronic switch, it is with good conditionsi making reading of NFC label chip, thereby can avoid some unnecessary operations, can improve the security of the storage information in the NFC label chip simultaneously.Controlled NFC label described in the utility model can be applied in a lot of occasions, particularly can make when bluetooth earphone shuts down for bluetooth earphone, and the information in its embedded NFC label chip is not read.
The accompanying drawing explanation
Fig. 1 is schematic diagram, shows the course of work of NFC card reader and NFC label;
Fig. 2 is schematic diagram, shows the method for control NFC label described in the utility model;
Fig. 3 is circuit block diagram, shows the structure of controlled NFC label described in the utility model;
Fig. 4 a-4d is circuit block diagram, shows respectively four kinds of example structure of the electronic switch control circuit in controlled NFC label described in the utility model; And
Fig. 5 a-5b is circuit diagram, shows respectively two embodiment of the electronic switch in controlled NFC label described in the utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
In the following description, only by the mode of explanation, some example embodiment of the present utility model has been described.Undoubtedly, those of ordinary skill in the art can recognize, in the situation that do not depart from spirit and scope of the present utility model, can to described embodiment, be revised by various mode.Therefore, accompanying drawing is illustrative with being described in essence, rather than for limiting the protection domain of claim.When a device or terminal b referred to as while being connected with another device or terminal, this device or terminal can directly be connected with described another device or terminal, also can have other device to be connected between this device or terminal and described another device or terminal.In addition, in this manual, identical Reference numeral means same or analogous part.
Fig. 2 is schematic diagram, shows the method for control NFC label described in the utility model.In Fig. 2, NFC label 1 is front with reference to the described common NFC label of Fig. 1, and it comprises NFC label chip 11 and NFC aerial coil 12.In addition, be parallel with electronic switch 2 at the two ends of NFC aerial coil 12.As shown in Figure 2, in the method for control NFC label described in the utility model, at first, in step S100, produce for making disconnection control signal or the conducting control signal of electronic switch disconnection or conducting.Then, in step S200, this disconnection control signal or conducting control signal are applied on the electronic switch 2 in parallel with the NFC aerial coil 12 in NFC label 1, thereby enable or forbid that the electromagnetic energy of coupling in NFC aerial coil 12 transmits to NFC label chip 11.
Specifically, the disconnection of electronic switch 2 does not change the attribute of NFC aerial coil 12, and the closure of electronic switch 2 changes the attribute of NFC aerial coil 12.In other words, when electronic switch 2 disconnects, its impedance is very high, now, the load of NFC aerial coil 12 just only has the NFC label chip 11 of rear class, so in NFC aerial coil 12, the electromagnetic energy of coupling can all be delivered on the NFC label chip 11 of rear class, thereby can guarantee the normal wireless communication between NFC card reader and NFC label 1.When electronic switch 2 conductings (closed), its impedance is very low, can make 12 short circuits of NFC aerial coil, so, in NFC aerial coil 12, the electromagnetic energy of coupling can't be delivered on the NFC label chip 11 of rear class, thereby can forbid the radio communication between NFC card reader and NFC label 1, make the NFC card reader can't read the information in NFC label chip 11.
Can be by enable signal or disable signal input electronic switch control circuit be produced to described disconnection control signal or conducting control signal.Usually, disconnection or the conducting meeting of controlling electronic switch need disconnection control signal or the conducting control signal that voltage levvl is higher, therefore, described electronic switch control circuit can comprise booster circuit, so that the voltage levvl that external power source is provided is boosted, the voltage levvl perhaps voltage levvl of enable signal or disable signal or enable signal or disable signal produced is boosted, thereby produces satisfactory disconnection control signal or conducting control signal.
In addition, electronic switch 2 can mainly consist of JFET or MOSFET.JFET comprises n raceway groove and p raceway groove JFET, and MOSFET comprises n raceway groove and p channel enhancement MOSFET and n raceway groove and p channel depletion type MOSFET.
Fig. 3 is circuit block diagram, shows the structure of controlled NFC label described in the utility model.As shown in Figure 3, controlled NFC label 100 described in the utility model comprises NFC tag body 1, electronic switch 2 and electronic switch control circuit 3.
NFC tag body 1 is front with reference to the described common NFC label of Fig. 1, and it comprises NFC label chip 11 and the NFC aerial coil 12 be connected with NFC label chip 11.
Electronic switch control circuit 3 has enable/disable signals input end 3a and output terminal 3b, and output terminal 3b is connected with the control end 2c of electronic switch 2.
NFC tag body 1, electronic switch 2 and electronic switch control circuit 3 can be discrete unit.Electronic switch 2 also can be integrated on NFC label chip 11, or electronic switch 2 and electronic switch control circuit 3 can all be integrated on NFC label chip 11.
When enable signal or disable signal during from the enable/disable signals input end 3a input of electronic switch control circuit 3, the output terminal 3b of electronic switch control circuit 3 correspondingly exports and disconnects control signal or conducting control signal, described disconnection control signal or conducting control signal are applied to the control end 2c of electronic switch 2, make correspondingly to disconnect or conducting between the first link 2a of electronic switch 2 and the second link 2b, that is to say, when enable signal during from the enable/disable signals input end 3a of electronic switch control circuit 3 input, disconnect the output terminal 3b output of control signal from electronic switch control circuit 3, and be applied on the control end 2c of electronic switch 2, thereby electronic switch 2 is disconnected.When disable signal during from the enable/disable signals input end 3a of electronic switch control circuit 3 input, the conducting control signal is from the output terminal 3b output of electronic switch control circuit 3, and the control end 2c that is applied to electronic switch 2 is upper, thereby make electronic switch 2 conductings (closed).
When electronic switch 2 disconnects, its impedance is very high, now, the load of NFC aerial coil 12 just only has the NFC label chip 11 of rear class, so, in NFC aerial coil 12, the electromagnetic energy of coupling can all be delivered on the NFC label chip 11 of rear class, thereby can guarantee the normal wireless communication between NFC card reader and NFC tag body 1.When electronic switch 2 conductings (closed), its impedance is very low, can make 12 short circuits of NFC aerial coil, so, in NFC aerial coil 12, the electromagnetic energy of coupling can't be delivered on the NFC label chip 11 of rear class, thereby can forbid the radio communication between NFC card reader and NFC tag body 1, make the NFC card reader can't read the information in NFC label chip 11.
Usually, because disconnection or the conducting of controlling electronic switch 2 need disconnection control signal or the conducting control signal that voltage levvl is higher, therefore, electronic switch control circuit 3 can comprise booster circuit, with output, is enough to that electronic switch 2 is disconnected or disconnection control signal or the conducting control signal of conducting.
Fig. 4 a-4d is circuit block diagram, shows respectively four kinds of example structure of the electronic switch control circuit in controlled NFC label described in the utility model.
In one embodiment, as shown in Fig. 4 a, electronic switch control circuit 3 comprises controlled boosting circuit 31, when the input end 3a when the enable/disable signal by electronic switch control circuit 3 is input in controlled boosting circuit 31, controlled boosting circuit 31 can for example, by output terminal 3b output disconnection/conducting control signal, nVcc/0, wherein, Vcc is to provide the supply voltage to controlled boosting circuit 31, and n is greater than 1 for the coefficient that boosts, n.
In another embodiment, as shown in Figure 4 b, electronic switch control circuit 3 comprises controlled voltage negater circuit 32 and booster circuit 33, when the input end 3a when the enable/disable signal by electronic switch control circuit 3 is input in controlled voltage negater circuit 32, controlled voltage negater circuit 32 output examples are as-Vcc/0, wherein, Vcc is to provide the supply voltage to controlled voltage negater circuit 32.The output voltage of controlled voltage negater circuit 32, after booster circuit 33 boosts, becomes disconnection/conducting control signal-nVcc/0 and exports by output terminal 3b.
In yet another embodiment, as shown in Fig. 4 c, electronic switch control circuit 3 comprises controlled boosting circuit 31, when the input end 3a when the enable/disable signal by electronic switch control circuit 3 is input in controlled boosting circuit 31, controlled boosting circuit 31 can be by output terminal 3b output disconnection/conducting control signal, for example-nVcc/0, wherein ,-Vcc is to provide the supply voltage to controlled boosting circuit 31.
In another embodiment, as shown in Fig. 4 d, electronic switch control circuit 3 comprises booster circuit 33.In the present embodiment, the enable/disable signal both as control signal also as power supply signal.When the input end 3a for example, when enable/disable signal (Vcc/0) by electronic switch control circuit 3 is input in booster circuit 33, booster circuit 33 is just for example, by output terminal 3b output disconnection/conducting control signal, nVcc/0.
The various implementations of controlled boosting circuit 31, controlled voltage negater circuit 32, booster circuit 33 are well known to those skilled in the art, and just no longer it are described in detail here.In some applications, wish that the electronic equipment that controlled NFC label described in the utility model is housed is when start, the NFC label chip in controlled NFC label can read, and, when shutdown, the NFC label chip in controlled NFC label not can read.In this case, can to make described enable signal be non-zero voltage signal, make described disable signal is the 0V voltage signal.
Can find out from the specific embodiment of above-mentioned electronic switch control circuit, by adjusting the structure of electronic switch control circuit, can export the disconnection of various electronic switches/conducting and control needed different disconnection/conducting control signal.
Fig. 5 a-5b is circuit diagram, shows respectively two embodiment of the electronic switch in controlled NFC label described in the utility model.
In one embodiment, as shown in Figure 5 a, electronic switch 2 comprises a n raceway groove JFET(Q1), the control end 2c that the grid of this JFET is electronic switch 2, the source electrode of this JFET and drain electrode are the first link 2a of electronic switch 2 and the second link 2b.
In this case, need to the control end 2c of electronic switch 2 input enough large negative voltage (for example ,-nVcc) just can make n raceway groove JFET(Q1) the raceway groove pinch off, that is, make electronic switch 2 disconnections, thus make the NFC card reader can with the proper communication of NFC label.For this reason, can select the described electronic switch control circuit 3 of earlier in respect of figures 4b and 4c to control disconnection and the conducting of the electronic switch 2 in the present embodiment.
In another embodiment; as shown in Figure 5 b; electronic switch 2 comprises n channel depletion type MOSFET(T1 and the T2 of two series connection) and two protection diodes (D1 and D2) being connected in parallel with these two depletion type MOS FET respectively; wherein, described two depletion type MOS FET(T1 and T2) grid jointly form the control end 2c of electronic switch 2.
According to characteristics and the international standard of NFC, under standard card cage, the transient voltage peak value at the two ends of the NFC aerial coil 12 of the electromagnetic energy that has been coupled reaches as high as 10V, even surpasses 10V.Two protection diodes (D1 and D2) can be guaranteed two n channel depletion type MOSFET(T1 and T2) exempt from the damage of high pressure.Specifically; protection connection (being the back-to-back or face-to-face connection of D1 and D2) due to D1 and D2; when the voltage at NFC aerial coil 12 two ends is very high; synchronization; a pipe in T1 and T2 only bears the voltage of the breakdown reverse voltage that is no more than D1 or D2, and another pipe is fallen by short circuit.
Similarly, can select the described electronic switch control circuit 3 of earlier in respect of figures 4b and 4c to control disconnection and the conducting of the electronic switch 2 in the present embodiment.
Controlled NFC label 100 described in the utility model can have a lot of application scenarios, especially, can be applied on bluetooth earphone.For example, on bluetooth earphone, be equipped with in the situation of controlled NFC label described in the utility model, if bluetooth earphone is in open state, enable signal (for example Vcc) is applied on the enable/disable signals input end of the electronic switch control circuit in controlled NFC label, thereby the electronic switch in controlled NFC label is disconnected.Now, for example, when the close described bluetooth earphone of the electronic equipment that the NFC card reader is housed (NFC mobile phone), this electronic equipment just can read the interior earphone unpaired messages such as Bluetooth address of NFC label chip of this bluetooth earphone, thereby is matched with this bluetooth earphone.If bluetooth earphone is in off-mode, disable signal (for example 0V) is applied on the enable/disable signals input end of the electronic switch control circuit in controlled NFC label, thereby makes the electronic switch conducting (closure) in controlled NFC label.Now, for example, when the electronic equipment that the NFC card reader is housed (NFC mobile phone), when the described bluetooth earphone, this electronic equipment just can not read the unpaired message in the NFC label chip of this bluetooth earphone, thereby can not be matched with this bluetooth earphone.Like this, both can avoid unnecessary operation, also can improve the security of the information in the NFC label chip.
Accompanying drawing has been described according to controlled NFC label described in the utility model in the mode of example above with reference to.But, it will be appreciated by those skilled in the art that the controlled NFC label proposed for above-mentioned the utility model, can also on the basis that does not break away from the utility model content, make various improvement.Therefore, protection domain of the present utility model should be determined by the content of appending claims.
Claims (6)
1. a controlled NFC label, is characterized in that, comprising:
The NFC tag body, this NFC tag body comprises NFC label chip and NFC aerial coil;
Electronic switch, this electronic switch has the first link, the second link and control end, and described the first link is connected with the two ends of described NFC aerial coil respectively with the second link; And
Electronic switch control circuit, this electronic switch control circuit has enable/disable signals input end and output terminal, and described output terminal is connected with the control end of described electronic switch,
Wherein, when enable signal or disable signal during from the enable/disable signals input end input of described electronic switch control circuit, the output terminal of described electronic switch control circuit is correspondingly exported and is disconnected control signal or conducting control signal, described disconnection control signal or conducting control signal are applied to the control end of described electronic switch, make correspondingly to disconnect or conducting between the first link of described electronic switch and the second link, thus correspondingly enable or the electromagnetic energy forbidding being coupled in described NFC aerial coil to the transmission of described NFC label chip.
2. controlled NFC label as claimed in claim 1, is characterized in that,
Described electronic switch is integrated on described NFC label chip, or described electronic switch and described electronic switch control circuit are integrated on described NFC label chip.
3. controlled NFC label as claimed in claim 1, is characterized in that,
Described electronic switch control circuit comprises booster circuit, with output, is enough to that described electronic switch is disconnected or disconnection control signal or the conducting control signal of conducting.
4. controlled NFC label as claimed in claim 1, is characterized in that,
Described enable signal is non-zero voltage signal, and described disable signal is the 0V voltage signal.
5. controlled NFC label as claimed in claim 4, is characterized in that,
Described electronic switch comprises a n raceway groove or p raceway groove JFET, the control end that the grid of this JFET is described electronic switch, and the source electrode of this JFET and drain electrode are the first link of described electronic switch and the second link.
6. controlled NFC label as claimed in claim 4, is characterized in that,
Described electronic switch comprises the n raceway groove of two series connection or p channel depletion type MOSFET and two protection diodes that are connected in parallel with these two depletion type MOS FET respectively; wherein, the common control end that forms described electronic switch of the grid of described two depletion type MOS FET.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320480558 CN203366368U (en) | 2013-08-07 | 2013-08-07 | Controlled NFC (Near Field Communication) tag |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320480558 CN203366368U (en) | 2013-08-07 | 2013-08-07 | Controlled NFC (Near Field Communication) tag |
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| CN203366368U true CN203366368U (en) | 2013-12-25 |
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| CN 201320480558 Expired - Fee Related CN203366368U (en) | 2013-08-07 | 2013-08-07 | Controlled NFC (Near Field Communication) tag |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103413165A (en) * | 2013-08-07 | 2013-11-27 | 歌尔声学股份有限公司 | Method for controlling NFC label and controlled NFC label |
| CN109087088A (en) * | 2018-08-10 | 2018-12-25 | 深圳市新国都技术股份有限公司 | A kind of nfc card |
| CN112086760A (en) * | 2019-06-12 | 2020-12-15 | 意法半导体公司 | NFC antenna switch |
-
2013
- 2013-08-07 CN CN 201320480558 patent/CN203366368U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103413165A (en) * | 2013-08-07 | 2013-11-27 | 歌尔声学股份有限公司 | Method for controlling NFC label and controlled NFC label |
| WO2015018336A1 (en) * | 2013-08-07 | 2015-02-12 | 歌尔声学股份有限公司 | Method for nfc tag control and controlled nfc tag |
| CN103413165B (en) * | 2013-08-07 | 2017-08-25 | 歌尔股份有限公司 | Control the method and controlled NFC label of NFC label |
| US9805230B2 (en) | 2013-08-07 | 2017-10-31 | Goertek Inc. | Method for controlling NFC tag and controlled NFC tag |
| CN109087088A (en) * | 2018-08-10 | 2018-12-25 | 深圳市新国都技术股份有限公司 | A kind of nfc card |
| CN112086760A (en) * | 2019-06-12 | 2020-12-15 | 意法半导体公司 | NFC antenna switch |
| CN112086760B (en) * | 2019-06-12 | 2024-01-02 | 意法半导体公司 | NFC antenna switch |
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| C14 | Grant of patent or utility model | ||
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Address after: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Patentee after: Goertek Inc. Address before: 261031 Dongfang Road, Weifang high tech Industrial Development Zone, Shandong, China, No. 268 Patentee before: Goertek Inc. |
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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: 20131225 Termination date: 20170807 |