CN103226724B - A kind of NFC label and a kind of NFC electronic equipment - Google Patents
A kind of NFC label and a kind of NFC electronic equipment Download PDFInfo
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- CN103226724B CN103226724B CN201310086472.9A CN201310086472A CN103226724B CN 103226724 B CN103226724 B CN 103226724B CN 201310086472 A CN201310086472 A CN 201310086472A CN 103226724 B CN103226724 B CN 103226724B
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- nfc
- supplying cell
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Abstract
The invention provides a kind of NFC label and NFC electronic equipment, described NFC label comprises the depletion type N-channel MOS FET and of two series connection for changing the voltage conversion circuit of supplying cell voltage; Be attempted by between NFC antenna and two connecting lines of NFC chip after described two depletion type N-channel MOS FET connect; The input end of described voltage conversion circuit connects described supplying cell, output terminal connects the grid of described two depletion type N-channel MOS FET, and when described supplying cell electricity is sufficient, the voltage that described voltage conversion circuit exports makes the drain electrode of two depletion type N-channel MOS FET and source electrode be in cut-off state, when supplying cell electricity is not enough, described voltage conversion circuit makes the drain electrode of two depletion type N-channel MOS FET and source electrode be in conducting state; Thus NFC label provided by the invention and NFC electronic equipment, when supplying cell electricity is low, NFC label is closed, and senses less than this NFC electronic equipment, thus eliminates the miscue produced because of dead battery capability, improve Consumer's Experience.
Description
Technical field
The present invention relates to wireless communication technology field, particularly relate to a kind of NFC label and a kind of NFC electronic equipment.
Background technology
NFC(near-field communication) more and more common being applied in the life of people of technology.The smart mobile phone of current main flow mostly possesses the function of NFC read-write, and the bluetooth earphone of its accessory comparatively middle and high end has also possessed NFC technique.
The application of NFC in bluetooth earphone be enable bluetooth earphone and and mobile phone match fast.Its application scenarios is: the mobile phone with NFC function and the bluetooth earphone with NFC function near time, bluetooth earphone Auto Power On and matching with mobile phone.The implementation method of this function is that bluetooth earphone inside is integrated with a passive NFC label (comprising NFC antenna and NFC chip), when mobile phone is near this NFC label, NFC label is coupled out the voltage signal of a higher level, this signal can the power supply of enable bluetooth earphone, and bluetooth earphone can be allowed to do corresponding operation.
But please refer to Fig. 1, possess the NFC label structure of the bluetooth earphone inside of NFC function at present, its NFC antenna 1 is directly connected with NFC chip 2.When its dead battery capability, have the mobile phone of NFC near this bluetooth earphone, this bluetooth earphone can not do any action.But because the NFC label of this bluetooth earphone still works, so mobile phone still has the prompting finding this bluetooth earphone, in this kind of situation, puzzlement can be caused to user, namely mobile phone have the miscue of NFC, but bluetooth earphone does not do the action envisioned.
Therefore, need a kind of NFC label and a kind of NFC electronic equipment, when electric device battery electricity is low, NFC label is inoperative, responds to less than this electronic equipment; When battery electric quantity can make electronic equipment normally work, NFC label normally uses.
Summary of the invention
The object of the present invention is to provide a kind of NFC label and a kind of NFC electronic equipment, the miscue produced because of dead battery capability when current NFC electronic equipment uses can be eliminated, improve Consumer's Experience.
For solving the problem, the invention provides a kind of NFC label, comprising NFC antenna and NFC chip, described NFC chip is directly connected with described NFC antenna by two connecting lines; Described NFC label also comprises the depletion type N-channel MOS FET and of two series connection for changing the voltage conversion circuit of supplying cell voltage; Be attempted by between described two connecting lines after described two depletion type N-channel MOS FET connect; The input end of described voltage conversion circuit connects described supplying cell, output terminal connects the grid of described two depletion type N-channel MOS FET, and when described supplying cell electricity is sufficient, the voltage that described voltage conversion circuit exports makes the drain electrode of two depletion type N-channel MOS FET and source electrode be in cut-off state, when supplying cell electricity is not enough, the output voltage of described voltage conversion circuit makes the drain electrode of two depletion type N-channel MOS FET and source electrode be in conducting state.
Further, described supplying cell is the lithium battery of 3.0V ~ 4.2V.
Further, described voltage conversion circuit comprises negative voltage charge pump or discrete device.
Further, the voltage that described voltage conversion circuit exports when described supplying cell electricity is sufficient is the negative voltage of absolute value at more than 10V.
The present invention also provides a kind of NFC electronic equipment, comprises one of above-mentioned NFC label.
Further, described NFC electronic equipment is bluetooth earphone, smart mobile phone or panel computer.
Compared with prior art, NFC label provided by the invention and NFC electronic equipment, described NFC label comprises the depletion type N-channel MOS FET and of two series connection for changing the voltage conversion circuit of supplying cell E voltage; Be attempted by between described two connecting lines after described two depletion type N-channel MOS FET connect; The input end of described voltage conversion circuit connects described supplying cell, output terminal connects the grid of described two depletion type N-channel MOS FET, and when described supplying cell electricity is sufficient, the voltage that described voltage conversion circuit exports makes the drain electrode of two depletion type N-channel MOS FET and source electrode be in cut-off state, when battery electric quantity is not enough, the output voltage of described voltage conversion circuit makes the drain electrode of two depletion type N-channel MOS FET and source electrode be in conducting state; Therefore, NFC label provided by the invention and NFC electronic equipment, when supplying cell electricity is low, NFC label is closed, and senses less than this NFC electronic equipment; When supplying cell electricity can make NFC electronic equipment normally work, NFC label normally uses, thus eliminates the miscue produced because of dead battery capability when current NFC electronic equipment uses, and improves Consumer's Experience.
Accompanying drawing explanation
Fig. 1 is the structural representation of NFC label of the prior art;
Fig. 2 is the structural representation of the NFC label of the specific embodiment of the invention;
Fig. 3 is the voltage transitions schematic diagram of the voltage conversion circuit of the specific embodiment of the invention.
Embodiment
Core concept of the present invention is the depletion type N-channel MOS FET and the voltage conversion circuit that add two series connection in NFC chip and NFC antenna, is namely attempted by between described two connecting lines after described two depletion type N-channel MOSs FETM1, M2 series connection; The input end of described voltage conversion circuit 3 connects described supplying cell E, output terminal connects the grid of described two depletion type N-channel MOSs FETM1, M2, and when described supplying cell electricity is sufficient, the voltage that described voltage conversion circuit exports makes the drain electrode of two depletion type N-channel MOSs FETM1, M2 and source electrode be in cut-off state, when supplying cell electricity is not enough, the output voltage of described voltage conversion circuit makes the drain electrode of two depletion type N-channel MOSs FETM1, M2 and source electrode be in conducting state.
For making object of the present invention, feature becomes apparent, and be further described, but the present invention can realize by different forms, should not think and just be confined to described embodiment below in conjunction with accompanying drawing to the specific embodiment of the present invention.
Please refer to Fig. 2, the invention provides a kind of NFC label, comprise NFC antenna 1 and NFC chip 2, described NFC chip 2 is directly connected with described NFC antenna 1 by two connecting lines (sign); Described NFC label also comprises depletion type N-channel MOS FETM1, M2 and of two series connection for changing the voltage conversion circuit 3 of supplying cell E voltage; Be attempted by between described two connecting lines after described two depletion type N-channel MOSs FETM1, M2 series connection; The input end of described voltage conversion circuit 3 connects described supplying cell E, and output terminal connects the grid of described two depletion type N-channel MOSs FETM1, M2.
Wherein, described voltage conversion circuit 3 can be any can be by the voltage transitions of supplying cell E can by the circuit structure of the output voltage of the drain electrode of two depletion type N-channel MOSs FETM1, M2 of series connection and source electrode cut-off or conducting, in the present embodiment, described supplying cell E is lithium battery, and normal output voltage is 3.0V ~ 4.2V; Described voltage conversion circuit 3 is that lithium battery voltage (3.0V ~ 4.2V) is transformed into the circuit structure of absolute value at the negative voltage of more than 10V, and this circuit structure can be converted by negative voltage charge pump and form, and also can be formed by connecting by discrete device.
Please refer to Fig. 3, Fig. 3 is the voltage transitions example of-10V voltage conversion circuit.Voltage conversion circuit 3 comprises boost DC-DC control circuit 31 and negative voltage charge pump 32.Boost DC-DC control circuit 31 can be made up of TPS61222 chip and peripheral circuit thereof, its objective is that the voltage 3.0V ~ 4.2V by lithium battery (i.e. supplying cell E) exports converts 5V voltage to.Negative voltage charge pump 32 can be made up of reversed charge pump chip LM2682 and peripheral circuit thereof, and its function becomes-10V voltage to export the 5V voltage transitions of input.The principle of work of the voltage transitions of voltage conversion circuit is when electric quantity of lithium battery is more (lithium battery protection board is not protected); lithium battery output voltage is 3.0V ~ 4.2V; correspondingly, boost DC-DC control circuit 31 exports as 5V voltage, and negative voltage charge pump 32 exports as-10V voltage.When electric quantity of lithium battery is lower, battery protecting plate carries out low-voltage variation to lithium battery electric core, and lithium battery output voltage is 0V, and correspondingly, boost DC-DC control circuit 31 and charge pump 32 all output voltage are 0V.
Output voltage due to voltage conversion circuit 3 directly can control the grid voltage of two depletion type N-channel MOSs FETM1, M2, and when the electricity of described supplying cell E is sufficient, the voltage transitions of supplying cell becomes-10V voltage to export (or absolute value higher negative voltage) by described voltage conversion circuit 3, thus make the drain electrode of two depletion type N-channel MOSs FETM1, M2 and source electrode be in cut-off state, this situation is equivalent to depletion type N-channel MOS FETM1, M2 not to be existed, and the NFC function of the electronic equipment at NFC label place normally uses; When the electricity of supplying cell E is not enough, the output voltage of described voltage conversion circuit is 0, the grid voltage of two depletion type N-channel MOSs FETM1, M2 is also 0, the drain electrode of two depletion type N-channel MOSs FETM1, M2 and source electrode is made to be in low-resistance conducting state, this situation is equivalent to NFC antenna 1 short circuit, NFC label inoperative (or being interpreted as that NFC function is closed), so just sensing is less than this NFC electronic equipment.
It should be noted that, supplying cell electricity abundance refers to that the NFC electronic equipment that the current electricity of supplying cell can maintain NFC label place can normally work, and namely the current output voltage of supplying cell is within the scope of the normal output voltage of this supplying cell; Supplying cell electricity deficiency refers to that the electricity of supplying cell is about to exhaust or exhaust, the NFC electronic equipment that current remaining electricity cannot maintain NFC label place can normally work, NFC electronic equipment cannot respond various command operating, and namely the current output voltage of supplying cell is lower than the normal output voltage scope of this supplying cell.For mobile phone and bluetooth earphone (containing NFC label of the present invention), effect of the present invention is described below.
NFC label of the present invention is applied in after on a bluetooth earphone, when the supplying cell voltage of bluetooth earphone exports normal, the voltage transitions of lithium battery becomes-10V voltage to export by described voltage conversion circuit, thus make the drain electrode of two depletion type N-channel MOSs FETM1, M2 and source electrode be in cut-off state, this situation is equivalent to depletion type N-channel MOS FETM1, M2 not to be existed, and mobile phone and bluetooth earphone can well use NFC label to communicate.When the supplying cell electricity of bluetooth earphone exhausts, the output voltage of described voltage conversion circuit is 0, two depletion type N-channel MOS FETM1, the grid voltage of M2 is also 0, make two depletion type N-channel MOS FETM1, the drain electrode of M2 and source electrode are in low-resistance conducting state, this situation is equivalent to NFC antenna short circuit, the NFC label of bluetooth earphone inside is inoperative, mobile phone sensing is less than bluetooth earphone, thus mobile phone does not have any miscue, thus the error situation that the mobile phone display NFC pairing produced because supplying cell electricity exhausts when NFC label of the present invention can eliminate the use of current NFC bluetooth earphone is failed, improve Consumer's Experience.
Thus, the present invention also provides a kind of NFC electronic equipment, comprises above-mentioned NFC label, and described NFC electronic equipment can be the electronic equipments such as bluetooth earphone, smart mobile phone, panel computer.
In sum, NFC label provided by the invention and NFC electronic equipment, described NFC label comprises the depletion type N-channel MOS FET and of two series connection for changing the voltage conversion circuit of supplying cell E voltage; Be attempted by between described two connecting lines after described two depletion type N-channel MOS FET connect; The input end of described voltage conversion circuit connects described supplying cell, output terminal connects the grid of described two depletion type N-channel MOS FET, and when described supplying cell electricity is sufficient, the voltage that described voltage conversion circuit exports makes the drain electrode of two depletion type N-channel MOS FET and source electrode be in cut-off state, when battery electric quantity is not enough, the output voltage of described voltage conversion circuit makes the drain electrode of two depletion type N-channel MOS FET and source electrode be in conducting state; Therefore, NFC label provided by the invention and NFC electronic equipment, when supplying cell electricity is low, NFC label is closed, and senses less than this NFC electronic equipment; When supplying cell electricity can make NFC electronic equipment normally work, NFC label normally uses, thus eliminates the miscue produced because of dead battery capability when current NFC electronic equipment uses, and improves Consumer's Experience.
Obviously, those skilled in the art can carry out various change and modification to invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (6)
1. a NFC label, comprises NFC antenna and NFC chip, and described NFC chip is directly connected with described NFC antenna by two connecting lines; It is characterized in that, described NFC label also comprises two depletion type N-channel MOS FET and for changing the voltage conversion circuit of supplying cell voltage; Be attempted by between described two connecting lines after described two depletion type N-channel MOS FET connect; The input end of described voltage conversion circuit connects described supplying cell, output terminal connects the grid of described two depletion type N-channel MOS FET, and when described supplying cell electricity is sufficient, the output voltage of described voltage conversion circuit makes the drain electrode of two depletion type N-channel MOS FET and source electrode be in cut-off state, when supplying cell electricity is not enough, the output voltage of described voltage conversion circuit makes the drain electrode of two depletion type N-channel MOS FET and source electrode be in conducting state.
2. NFC label as claimed in claim 1, it is characterized in that, described supplying cell is the lithium battery of 3.0V ~ 4.2V.
3. NFC label as claimed in claim 1, it is characterized in that, described voltage conversion circuit comprises negative voltage charge pump or discrete device.
4. NFC label as claimed in claim 2 or claim 3, is characterized in that, the voltage that described voltage conversion circuit exports when described supplying cell electricity is sufficient is the negative voltage of absolute value at more than 10V.
5. a NFC electronic equipment, is characterized in that, comprises the NFC label according to any one of Claims 1-4.
6. NFC electronic equipment as claimed in claim 5, it is characterized in that, described electronic equipment is bluetooth earphone, smart mobile phone or panel computer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310086472.9A CN103226724B (en) | 2013-03-18 | 2013-03-18 | A kind of NFC label and a kind of NFC electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310086472.9A CN103226724B (en) | 2013-03-18 | 2013-03-18 | A kind of NFC label and a kind of NFC electronic equipment |
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| Publication Number | Publication Date |
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| CN103226724A CN103226724A (en) | 2013-07-31 |
| CN103226724B true CN103226724B (en) | 2016-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310086472.9A Active CN103226724B (en) | 2013-03-18 | 2013-03-18 | A kind of NFC label and a kind of NFC electronic equipment |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| US9226098B2 (en) * | 2013-10-25 | 2015-12-29 | Magna Electronics Solutions Gmbh | Near field communication system and method for providing an effective antenna that is adaptable for different antenna configurations and locations of a portable device |
Citations (4)
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| CN201226450Y (en) * | 2008-07-04 | 2009-04-22 | 郴州高斯贝尔数码科技有限公司 | Mobile phone and pre-charging circuit therefore |
| CN102257515A (en) * | 2008-12-16 | 2011-11-23 | Ids有限责任公司 | Method for a battery and passive power supply to an rfid tag and a switching circuit for carrying out said method |
| CN102646875A (en) * | 2012-05-03 | 2012-08-22 | 中兴通讯股份有限公司南京分公司 | Antenna and terminal |
| CN203179066U (en) * | 2013-03-18 | 2013-09-04 | 青岛歌尔声学科技有限公司 | NFC tag and NFC electronic equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8620218B2 (en) * | 2011-06-29 | 2013-12-31 | Broadcom Corporation | Power harvesting and use in a near field communications (NFC) device |
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- 2013-03-18 CN CN201310086472.9A patent/CN103226724B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201226450Y (en) * | 2008-07-04 | 2009-04-22 | 郴州高斯贝尔数码科技有限公司 | Mobile phone and pre-charging circuit therefore |
| CN102257515A (en) * | 2008-12-16 | 2011-11-23 | Ids有限责任公司 | Method for a battery and passive power supply to an rfid tag and a switching circuit for carrying out said method |
| CN102646875A (en) * | 2012-05-03 | 2012-08-22 | 中兴通讯股份有限公司南京分公司 | Antenna and terminal |
| CN203179066U (en) * | 2013-03-18 | 2013-09-04 | 青岛歌尔声学科技有限公司 | NFC tag and NFC electronic equipment |
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| CN103226724A (en) | 2013-07-31 |
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