CN104156754B - The anti-theft device of non-contact IC card - Google Patents
The anti-theft device of non-contact IC card Download PDFInfo
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- CN104156754B CN104156754B CN201410351385.6A CN201410351385A CN104156754B CN 104156754 B CN104156754 B CN 104156754B CN 201410351385 A CN201410351385 A CN 201410351385A CN 104156754 B CN104156754 B CN 104156754B
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Abstract
The present invention relates to the anti-theft device of non-contact IC card, including：Rf signal reception unit, the radio frequency that equipment is read for receiving NFC reads signal, and radio frequency reading signal is changed into induced-current；Rectification unit, rectification is carried out by the induced-current being converted to；Interference signal generation unit, Radio Frequency Interfere is produced according to the signal after rectification, and the Radio Frequency Interfere produced is sent.The anti-theft device circuit structure for the non-contact IC card that the present invention is provided is simple, and cost of implementation is low, can effectively prevent non-contact IC card from reading equipment by NFC by criminal when not in use and stealing card inside information.
Description
Technical field
The present invention relates to electronic anti-theft technical field, and in particular to the anti-theft device of non-contact IC card.
Background technology
With the development of science and technology, the identity card of people, bank card, passport etc. be gradually substituted for by magnetic stripe card it is contactless
IC-card.
At present, many criminals read equipment to steal other people IC card information by NFC.Such as in crowded public transport
In upper, the crowded crowd, shopping place etc., NFC is read body of the equipment close to victim's non-contact IC card-type by criminal
Part card, bank card, passport etc., NFC, which reads equipment, just can easily read the information in the IC-card of victim, cause aggrieved
The leakage of personal information data, bank card information leakage of person etc..Criminal copies the IC card information stolen new IC silver
Row card, IC identity cards etc., and the wealth of victim is stolen with the IC bank cards replicated, or utilize the information progress others stolen
Illegal activity, different degrees of loss is brought to stolen taker.
Criminal, which reads equipment by NFC and steals the principle of other people non-contact IC card information, is specially：NFC is read
Equipment sends specific radio frequency and reads signal, and non-contact IC card is received after specific radio frequency reads signal and responded, and
The data of itself are launched by set frequency, the feedback signal that NFC readings equipment receives non-contact IC card is laggard
Row analyzing and processing, obtains the information of non-contact IC card memory storage, finally realizes stealing for non-contact IC card information.
The content of the invention
The purpose of the present invention is to overcome shortcomings and deficiencies of the prior art there is provided a kind of antitheft dress of non-contact IC card
Put, prevent NFC device from stealing the information of non-contact IC card.
The purpose of the present invention is achieved through the following technical solutions：The anti-theft device of non-contact IC card, its feature
It is, including：
Rf signal reception unit, the radio frequency that equipment is read for receiving NFC reads signal, and radio frequency is read into signal turn
It is melted into induced-current；
Rectification unit, rectification is carried out by the induced-current being converted to；
Interference signal generation unit, Radio Frequency Interfere is produced according to the signal after rectification, and the radio frequency produced is done
Signal is disturbed to send.
In non-contact IC card when not in use, the anti-theft device of non-contact IC card is set against non-contact IC card.When
NFC reads equipment close to non-contact IC card, and when launching radio frequency reading signal, the radio frequency of the anti-theft device of non-contact IC card
Signal receiving unit receives radio frequency and reads signal, and radio frequency reading signal is converted into induced-current, the rectified list of induced-current
Inputted after first rectification to interference signal generation unit, interference signal generation unit produces corresponding Radio Frequency Interfere, and launches
Go out.In free surrounding space, the Radio Frequency Interfere reads signal mixing with radio frequency and is superimposed, the superimposed RF after mixing superposition
Signal is inputted into non-contact IC card.The radio frequency before superposition can only be parsed due to non-contact IC card and reads signal, it is impossible to is solved
Analysis radio frequency reads the radiofrequency signal after signal is superimposed with Radio Frequency Interfere, and therefore, non-contact IC card receives superimposed RF
Corresponding feedback radiofrequency signal can not be produced after signal, cause NFC device can not reading non-contact type IC card information.
Specifically, the rf signal reception unit includes one first induction coil.
Specifically, the rectification unit is halfwave rectifier unit.
Specifically, the rectification unit includes one first diode, positive pole and the rf signal reception list of the first diode
The output end connection of member, negative pole is connected with the input of interference signal generation unit.
Specifically, the interference signal generation unit includes one first inductance, one second inductance, a triode, a resistance
And an electric capacity, the resistance constitutes parallel circuit with electric capacity, and one end of parallel circuit and the base stage of triode are connected, other end string
It is connected after joining the emitter stage that the first inductance is followed by triode, colelctor electrode the second inductance of series connection of triode with base stage, while connecing whole
Flow the output end of unit.
Specifically, the anti-theft device of the non-contact IC card also includes being connected in rf signal reception unit and interference letter
Indicating member between number generation unit.
Specifically, the indicating member includes more than one light emitting diode.
Specifically, the rf signal reception unit also includes one second induction coil, second induction coil and hair
The series circuit that the series circuit that optical diode is constituted is constituted with the first induction coil and the first diode is connected in parallel.
The present invention includes advantages below and beneficial effect compared with prior art：The non-contact IC card that the present invention is provided it is anti-
Robber's device circuit is simple in construction, and cost of implementation is low, can effectively prevent non-contact IC card from being passed through when not in use by criminal
NFC reads equipment and steals card inside information.
Brief description of the drawings
Fig. 1 is the theory diagram of the anti-theft device of non-contact IC card in embodiment；
Fig. 2 is the circuit theory diagrams of the anti-theft device of non-contact IC card in embodiment；
Fig. 3 is the anti-theft device application schematic diagram of non-contact IC card.
Embodiment
With reference to embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited
In this.
Embodiment
The anti-theft device of non-contact IC card, in non-contact IC card when not in use with non-contact IC card close to placement.
As shown in figure 1, the anti-theft device of the non-contact IC card includes：Rf signal reception unit, rectification unit, indicating member and
Interference signal generation unit.The radio frequency that the rf signal reception unit is used to receive NFC reading equipment reads signal, and will penetrate
Frequency reads signal and changes into induced-current；The induced-current being converted to is carried out rectification by the rectification unit；The interference letter
Signal after number generation unit rectification produces Radio Frequency Interfere, and the Radio Frequency Interfere produced is sent.
As shown in figure 3, the anti-theft device of non-contact IC card is set against IC-card in IC-card when not in use.When NFC is read
Equipment is close to IC-card, and when launching radio frequency reading signal, and the rf signal reception unit of the anti-theft device of non-contact IC card connects
Receive radio frequency read signal, and by radio frequency reading signal be converted into induced-current, inputted after the rectified unit rectification of induced-current to
Interference signal generation unit, interference signal generation unit produces corresponding Radio Frequency Interfere, and launches.In free surrounding space
In, the Radio Frequency Interfere reads signal mixing with radio frequency and is superimposed, and the superimposed RF signal after mixing superposition is inputted to IC-card
In.The radio frequency before superposition can only be parsed due to IC-card and reads signal, it is impossible to parses radio frequency reading signal and is folded with Radio Frequency Interfere
Plus after radiofrequency signal, therefore, IC-card, which is received, can not produce corresponding feedback radiofrequency signal after superimposed RF signal, cause
NFC device can not read the information of IC-card.
In the present embodiment, the particular circuit configurations of the anti-theft device of the non-contact IC card are as shown in Figure 2.It is described to penetrate
Frequency signal receiving unit includes the first induction coil E1, the second induction coil E2, and the rectification unit is by one first diode
The halfwave rectifier unit of D1 compositions.The indicating member is made up of a light emitting diode D2.The interference signal generation unit bag
Include one first inductance L1, one second inductance L2, a triode Q1, a resistance R1 and an electric capacity C1.
The resistance R1 and electric capacity C1 constitutes parallel circuit, and one end of parallel circuit is connected with triode Q1 base stage, separately
One end the first inductance L1 of series connection is followed by after triode Q1 emitter stage, triode Q1 the second inductance L2 of colelctor electrode series connection and base stage
Connection, while connecing the first diode D1 negative pole, the first diode D1 positive pole is connected with the first induction coil E1 one end.Institute
The negative pole for stating light emitting diode D2 is connected with the first diode D1 negative pole, and positive pole is connected with the second induction coil E2 one end,
Colelctor electrode of the first induction coil E1 other end and the second induction coil E2 other end with triode Q1 is connected.
The first induction coil E1, the second induction coil E2 receive radio frequency and read radio frequency reading signal conversion after signal
Into induced-current.The induced-current that the second induction coil E2 is produced makes light emitting diode D2 glisten, and realizes alarm, together
When the induced-current that is produced with the first induction coil E1 be input to triode Q1 base stage simultaneously.Resistance R1, electric capacity C1 and inductance
The oscillating circuit of L1 compositions produces Radio Frequency Interfere, and Radio Frequency Interfere is transmitted into by the first inductance L1 and the second inductance L2
In free surrounding space.
Above-described embodiment is preferably embodiment, but embodiments of the present invention are not by above-described embodiment of the invention
Limitation, other any Spirit Essences without departing from the present invention and the change made under principle, modification, replacement, combine, simplification,
Equivalent substitute mode is should be, is included within protection scope of the present invention.
Claims (4)
1. the anti-theft device of non-contact IC card, it is characterised in that including：
Rf signal reception unit, the radio frequency that equipment is read for receiving NFC reads signal, and radio frequency reading signal is changed into
Induced-current；
Rectification unit, rectification is carried out by the induced-current being converted to；
Interference signal generation unit, Radio Frequency Interfere, and the Radio frequency interference letter produced are produced according to the signal after rectification
Number send；
The rf signal reception unit includes one first induction coil；
The rectification unit is halfwave rectifier unit, and the rectification unit includes one first diode, the positive pole of the first diode
It is connected with the output end of rf signal reception unit, negative pole is connected with the input of interference signal generation unit；
The interference signal generation unit includes one first inductance, one second inductance, a triode, a resistance and an electric capacity, institute
State resistance and constitute parallel circuit with electric capacity, one end of parallel circuit and the base stage of triode are connected, the other end the first inductance of series connection
It is connected after being followed by the emitter stage of triode, colelctor electrode the second inductance of series connection of triode with base stage, while connecing the defeated of rectification unit
Go out end.
2. the anti-theft device of non-contact IC card according to claim 1, it is characterised in that：Also include being connected in radio frequency letter
Indicating member number between receiving unit and interference signal generation unit.
3. the anti-theft device of non-contact IC card according to claim 2, it is characterised in that：The indicating member includes one
Light emitting diode more than individual.
4. the anti-theft device of non-contact IC card according to claim 3, it is characterised in that：The rf signal reception list
Member also includes one second induction coil, series circuit and first line of induction that second induction coil and light emitting diode are constituted
The series circuit that circle and the first diode are constituted is connected in parallel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410351385.6A CN104156754B (en) | 2014-07-22 | 2014-07-22 | The anti-theft device of non-contact IC card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410351385.6A CN104156754B (en) | 2014-07-22 | 2014-07-22 | The anti-theft device of non-contact IC card |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104156754A CN104156754A (en) | 2014-11-19 |
| CN104156754B true CN104156754B (en) | 2017-08-25 |
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ID=51882251
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410351385.6A Active CN104156754B (en) | 2014-07-22 | 2014-07-22 | The anti-theft device of non-contact IC card |
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| CN (1) | CN104156754B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104794436A (en) * | 2015-04-03 | 2015-07-22 | 北京奇虎科技有限公司 | Data theft preventing device and method |
| CN105825261B (en) * | 2016-05-13 | 2019-05-14 | 包有娣 | A kind of equipment for preventing electronic labeling information to be stolen |
| CN206042008U (en) * | 2016-09-18 | 2017-03-22 | 深圳市联合智能卡有限公司 | A circuit for signal mask and anti -theft device thereof |
| CN109325577A (en) * | 2018-09-10 | 2019-02-12 | 李文昌 | A kind of rfid circuit and non-contact IC card alarm |
| CN109359490A (en) * | 2018-09-12 | 2019-02-19 | 李文昌 | Illegal portable IC card based on mobile terminal identifies device and method |
| CN109409155B (en) * | 2018-10-19 | 2019-07-23 | 湖北用芯物联科技有限公司 | A kind of radio frequency signal shield circuit and shield card |
| CN113834983B (en) * | 2021-08-26 | 2024-05-14 | 北京中电华大电子设计有限责任公司 | Interference test method for non-contact smart card |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101042741A (en) * | 2006-03-23 | 2007-09-26 | 日本电气株式会社 | RFID tag |
| CN204129763U (en) * | 2014-07-22 | 2015-01-28 | 赵伊宁 | The anti-theft device of non-contact IC card |
-
2014
- 2014-07-22 CN CN201410351385.6A patent/CN104156754B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101042741A (en) * | 2006-03-23 | 2007-09-26 | 日本电气株式会社 | RFID tag |
| CN204129763U (en) * | 2014-07-22 | 2015-01-28 | 赵伊宁 | The anti-theft device of non-contact IC card |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104156754A (en) | 2014-11-19 |
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