CN109409155B - A kind of radio frequency signal shield circuit and shield card - Google Patents
A kind of radio frequency signal shield circuit and shield card Download PDFInfo
- Publication number
- CN109409155B CN109409155B CN201811224269.2A CN201811224269A CN109409155B CN 109409155 B CN109409155 B CN 109409155B CN 201811224269 A CN201811224269 A CN 201811224269A CN 109409155 B CN109409155 B CN 109409155B
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- China
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- inductance
- voltage
- stabiliser tube
- coil
- radio frequency
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Classifications
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
- G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
- G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
- G06K7/10257—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves arrangements for protecting the interrogation against piracy attacks
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
- G06K19/00—Record carriers for use with machines and with at least a part designed to carry digital markings
- G06K19/06—Record carriers for use with machines and with at least a part designed to carry digital markings characterised by the kind of the digital marking, e.g. shape, nature, code
- G06K19/067—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components
- G06K19/07—Record carriers with conductive marks, printed circuits or semiconductor circuit elements, e.g. credit or identity cards also with resonating or responding marks without active components with integrated circuit chips
- G06K19/073—Special arrangements for circuits, e.g. for protecting identification code in memory
- G06K19/07309—Means for preventing undesired reading or writing from or onto record carriers
- G06K19/07318—Means for preventing undesired reading or writing from or onto record carriers by hindering electromagnetic reading or writing
Abstract
A kind of radio frequency signal shield circuit of the present invention, including the first inductance and second inductance, the first inductance both ends are connect with the first voltage-stabiliser tube and second voltage-stabiliser tube one end respectively, the first common junction is equipped between first inductance and the second voltage-stabiliser tube anode, two cathode of first voltage-stabiliser tube and the second voltage-stabiliser tube connect to form the second common junction, it is connect respectively with the second inductance both ends in the first common junction with the second common junction, wherein the second inductance inductance value is greater than the first inductance.In use, the first inductance obtains energy, the second inductance carries out boosting to circuit, and when being greater than the breakdown reverse voltage of voltage-stabiliser tube, the short circuit of the first inductance can not obtain electric energy, voltage-stabiliser tube forward conduction.First inductance obtains electric energy again, and after the second inductance boost to voltage-stabiliser tube reverse breakdown, the first inductance loses electric energy again, and voltage-stabiliser tube constantly ends conducting in reading process, and the first inductance generates electromagnetic wave and interferes read-write radiofrequency signal.It can be widely applied to frequency to penetrate in the interference of read-write.
Description
Technical field
The present invention relates to intelligent chip technical field, in particular to a kind of radio frequency signal shield circuit and shield card.
Background technique
Existing smart chip card is widely used on bank card, since its safety is higher than magnetic stripe card such as credit card
Deng can prevent from being replicated, safety is higher.Since bank is in order to facilitate user's use, usual chip bank card can be set
It sets certain amount and exempts from password payment function, since the chip bank card can usually be swiped the card by two modes, one is connect
Corresponding information or transaction are read in touch after contacting chip bank card with read-write equipment；Another is by contactless, by core
Piece bank card, which does not need contact when being placed in read-write equipment read-write range, can read corresponding information or transaction.Therefore with
When body carries the chip bank card of entity, it is easy to exempt from the close means of payment by read-write equipment transmitting radio-frequency information and steal in bank card
Fund, therefore there is the risk of certain stolen card.
Summary of the invention
The invention mainly solves the technical problem of providing a kind of radio frequency signal shield circuit and shield card, the wherein radio frequency
Interference is generated when screened circuit reads and writes radio frequency, and the signal between neighbouring radio frequency chip bank card and reader is avoided to transmit,
The risk for reducing the stolen brush of radio frequency chip bank card improves the safety that chip bank card carries, and circuit is simple, at low cost.
To solve the above-mentioned problems, the present invention provides a kind of radio frequency signal shield circuit, the radio frequency signal shield circuit, packet
The first inductance and second inductance are included, first inductance both ends connect with one end of the first voltage-stabiliser tube and the second voltage-stabiliser tube respectively
It connects, is equipped with the first common junction, the first voltage-stabiliser tube and the second voltage-stabiliser tube two between first inductance and the second voltage-stabiliser tube anode
Cathode connects to form the second common junction, connect respectively with the second inductance both ends in the first common junction with the second common junction,
Wherein the second inductance inductance value is greater than the first inductance.
It further says, first voltage-stabiliser tube and the second voltage-stabiliser tube are identical, and respectively 15V zener diode.
It further says, first inductance and the second inductance include coil inductance.
It further says, second inductance includes the identical concatenated inductance of at least two inductance value.
It further says, the first inductance resonance frequency is identical as reader.
The present invention provides a kind of radio frequency signal shield card, which includes the First Line of setting on the body
Circle and second coil, the first coil both ends are connect with one end of the first voltage-stabiliser tube and the second voltage-stabiliser tube respectively, the First Line
It is equipped with the first common junction between circle and the second voltage-stabiliser tube anode, two cathode of the first voltage-stabiliser tube and the second voltage-stabiliser tube connect to be formed
Second common junction is connect, wherein described second respectively with the second coil both ends with the second common junction in the first common junction
Coil inductance is greater than first coil inductance.
It further says, first voltage-stabiliser tube and the second voltage-stabiliser tube are identical, and respectively 15V zener diode.
It further says, second coil includes two or more, and electric signal is connected between each second coil
Connection.
It further says, each second coil is successively covered big coil outside small coil by coil size.
It further says, the First Line snare is outside the second coil.
It further says, the first inductance resonance frequency is identical as reader.
Radio frequency signal shield circuit of the present invention, including the first inductance and second inductance, the first inductance both ends respectively with
The connection of one end of first voltage-stabiliser tube and the second voltage-stabiliser tube is equipped with first between first inductance and the second voltage-stabiliser tube anode and public connects
Point, two cathode of the first voltage-stabiliser tube and the second voltage-stabiliser tube connect to form the second common junction, public with second in the first common junction
Contact is connect with the second inductance both ends respectively altogether, wherein the second inductance inductance value is greater than the first inductance.When frequency read/write is sent out
Out when radio frequency read-write, since the first inductance resonance frequency is close with reader, thus generated on the first inductance it is biggish to
The induced current in the second inductance direction, the second inductance carry out boosting to circuit, when the voltage at the second inductance both ends is greater than surely
When the breakdown reverse voltage of pressure pipe, the first inductance is in short-circuit condition, can not obtain electric energy, and the second inductance loses boosting, surely
Pressure pipe forward conduction.The first inductance obtains electric energy again at this time, and the second inductance carries out after boosting to voltage-stabiliser tube reverse breakdown, and loses
Electric energy, voltage-stabiliser tube constantly ends conducting in reading process, and inductance generates electromagnetic wave during on and off, to read-write
Radiofrequency signal is interfered.It can be widely applied to frequency to penetrate in the interference of read-write.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the attached drawing in description illustrates only the present invention
Some embodiments, therefore be not construed as the restriction to range, for those of ordinary skill in the art, do not paying
Under the premise of creative work, it can also be obtained according to these attached drawings other relevant attached drawings.
Fig. 1 is radio frequency signal shield circuit embodiments circuit diagram.
Fig. 2 is radio frequency signal shield card example structure schematic diagram.
Below with reference to embodiment, and referring to attached drawing, the realization, the function and the advantages of the object of the present invention are made furtherly
It is bright.
Specific embodiment
In order to illustrate more clearly of technical solution of the present invention, combined with specific embodiments below and figure is to right of the invention
It is required that being described in further detail, it is to be understood that the following drawings illustrates only certain embodiments of the present invention, therefore not
It should be considered as the restriction to range, the modification of anyone limited times made within the scope of the invention as claimed, still at this
Within the scope of the claims of invention.
It is to be appreciated that in the description of the present invention, it should be noted that the orientation of the instructions such as term " on ", "lower"
Or positional relationship be based on the orientation or positional relationship shown in the drawings or the invention product using when the orientation usually put
Or positional relationship, it is merely for convenience of description of the present invention and simplification of the description, rather than the device or element of indication or suggestion meaning
It must have a particular orientation, be constructed and operated in a specific orientation, therefore be not considered as limiting the invention.In addition,
Term " first ", " second " etc. are only used for distinguishing description, are not understood to indicate or imply relative importance.
As shown in Figure 1, the present invention provides a kind of radio frequency signal shield circuit embodiments.
The radio frequency signal shield circuit includes: the first inductance L1 and to the second inductance L2, the both ends the first inductance L1 point
It is not connect with one end of the first voltage-stabiliser tube D1 and the second voltage-stabiliser tube D2, wherein the first inductance L1 and the second voltage-stabiliser tube D2 anode
Between be equipped with first common junction two cathode of E, the first voltage-stabiliser tube D1 and the second voltage-stabiliser tube D2 connect to form the second common junction F,
It is connect respectively with the second both ends inductance L2 in the first common junction with the second common junction F, wherein the second inductance L2 inductance value
Greater than the first inductance L1.
Specifically, the first inductance L1 and the second inductance L2 uses coil.Wherein the inductance value of the second inductance L2 is big
In the first inductance L1.The second voltage-stabiliser tube D2 and the first voltage-stabiliser tube D1 uses the zener diode of identical 15V.
When frequency read/write issues radio frequency read-write, since the first inductance resonance frequency is close with reader, thus
Generate the biggish induced current to the second inductance direction on first inductance, the second inductance carries out boosting to circuit, when the
When the voltage at two inductance both ends is greater than the breakdown reverse voltage of voltage-stabiliser tube, the first inductance is in short-circuit condition, can not obtain electric energy, the
Two inductance lose boosting, voltage-stabiliser tube forward conduction.The first inductance obtains electric energy again at this time, and the second inductance boost to steady
After pressure pipe reverse breakdown, and electric energy is lost, voltage-stabiliser tube constantly ends conducting in reading process, during on and off
Inductance generates electromagnetic wave, interferes read-write radiofrequency signal.It can be widely applied to frequency to penetrate in the interference of read-write.
That is, the electric energy that the first inductance L1 is obtained is larger, the electric current to the second direction inductance L2, the second inductance are generated
L2 boosts to circuit, when the voltage after the second inductance L2 boosting reaches backward voltage breakdown voltage-stabiliser tube, voltage-stabiliser tube reverse-conducting,
First inductance L1 can not obtain electric energy, the second inductance L2 decompression, when the backward voltage that voltage is lower than voltage-stabiliser tube punctures piezoelectricity, pressure stabilizing
Pipe forward conduction.First inductance L1 can obtain electric energy again, repeat the above process, to generate corresponding electromagnetic interference signal.
In the present embodiment, the second inductance L2 can according to need is connected in series using two or more inductance, when
Total inductance value when multiple inductance are connected is greater than the first inductance L1.
As shown in Fig. 2, the present invention provides a kind of radio frequency signal shield card, which includes being arranged in ontology
First coil 2 and second coil 3 on 1,2 both ends of first coil respectively with the first voltage-stabiliser tube and the second voltage-stabiliser tube one
End connection, is wherein equipped with the first common junction between the first coil 2 and the second voltage-stabiliser tube D2 anode, the first voltage-stabiliser tube D1 and the
Two cathode of voltage-stabiliser tube D2 two connect to form the second common junction, connect respectively with the second inductance both ends, wherein second line
3 inductance values are enclosed greater than 2 inductance of first coil.
Specifically, first inductance 2 and the second inductance 3 use coil.Wherein the inductance value of the second inductance 3 is greater than the
One inductance 2.The second voltage-stabiliser tube D2 and the first voltage-stabiliser tube D1 uses the zener diode of identical 15V.Second coil
Including two or more, electric signal is connected in series between each second coil.
When frequency read/write issues radio frequency read-write, since first coil resonance frequency is close with reader, thus
Generate the biggish induced current to the second coil direction in first coil, the second coil carries out boosting to circuit, when the
When the voltage at two coil both ends is greater than the breakdown reverse voltage of voltage-stabiliser tube, first coil is in short-circuit condition, can not obtain electric energy, the
Two coil loses boosting, voltage-stabiliser tube forward conduction.First coil obtains electric energy again at this time, and the second coil boost to steady
After pressure pipe reverse breakdown, and electric energy is lost, voltage-stabiliser tube constantly ends conducting in reading process, during on and off
Coil generating electromagnetic wave interferes read-write radiofrequency signal.It can be widely applied to frequency to penetrate in the interference of read-write.
That is, the electric energy that first coil obtains is larger, the electric current to the second coil direction is generated, the second coil is to electricity
Road boosting, when the voltage after the boosting of the second coil reaches backward voltage breakdown voltage-stabiliser tube, voltage-stabiliser tube reverse-conducting, first coil
Electric energy, the second coil decompression can not be obtained, when the backward voltage that voltage is lower than voltage-stabiliser tube punctures piezoelectricity, voltage-stabiliser tube forward conduction.
First coil can obtain electric energy again, repeat the above process, to generate corresponding electromagnetic interference signal, destroy bank card and read-write
Signal transmits between equipment, to prevent from reading the stolen brush of bank's chip information.When user uses bank card, by bank's chip
Card is separated with shield card, and shield card can not have signal to interfere between bank's chip and read-write equipment, to improve bank
The safety of chip card prevents stolen swipe the card.
In the present embodiment, second inductance 3 can according to need is connected in series using two or more inductance, when more
Total inductance value when a inductance is connected is greater than the first inductance 2.When inductance uses coil, wherein first coil area is greater than the
Two coil.
Each second coil is successively covered big coil outside small coil by coil size.2 sets of the first coil is second
Outside coil 3, can effectively save card space, while facilitate reduce card thickness.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, those skilled in the art should understand that: it still can be to aforementioned each implementation
Technical solution documented by example is modified, person's equivalent replacement of some of the technical features, and these modification replacements, and
Depart from the spirit and scope of the technical scheme of various embodiments of the present invention the essence of corresponding technical solution.
Claims (9)
1. radio frequency signal shield circuit, which is characterized in that including the first inductance and second inductance, first inductance both ends point
It is not connect with one end of the first voltage-stabiliser tube and the second voltage-stabiliser tube, it is public to be equipped with first between first inductance and the second voltage-stabiliser tube anode
Contact altogether, two cathode of the first voltage-stabiliser tube and the second voltage-stabiliser tube connect to form the second common junction, in the first common junction and the
Two common junctions are connect with the second inductance both ends respectively, wherein the second inductance inductance value is greater than the first inductance, frequency read/write
When, the first inductance generates induced current, and the second inductance boosts to circuit, makes the reverse breakdown of voltage-stabiliser tube, the first inductance is short
Road, voltage-stabiliser tube forward conduction, the first inductance generate induced current again, and the second inductance boost makes voltage-stabiliser tube reverse breakdown, in pressure stabilizing
Inductance generates electromagnetic wave and interferes read-write radiofrequency signal during pipe on and off.
2. radio frequency signal shield circuit according to claim 1, it is characterised in that: first voltage-stabiliser tube and the second pressure stabilizing
Manage identical, and respectively 15V zener diode.
3. radio frequency signal shield circuit according to claim 1, it is characterised in that: first inductance and the second inductance packet
Include coil inductance.
4. radio frequency signal shield circuit according to claim 1, it is characterised in that: second inductance includes at least two
The identical concatenated inductance of a inductance value.
5. a kind of radio frequency signal shield card, which is characterized in that including first coil and second coil on the body, institute is arranged
It states first coil both ends to connect with one end of the first voltage-stabiliser tube and the second voltage-stabiliser tube respectively, the first coil and the second voltage-stabiliser tube are just
The first common junction is equipped between pole, two cathode of the first voltage-stabiliser tube and the second voltage-stabiliser tube connect to form the second common junction,
First common junction is connect with the second coil both ends respectively with the second common junction, wherein second coil inductance is greater than the
One coil inductance, when frequency read/write, the first inductance generates induced current, and the second inductance boosts to circuit, makes voltage-stabiliser tube
Reverse breakdown, the short circuit of the first inductance, voltage-stabiliser tube forward conduction, the first inductance generates induced current again, and the second inductance boost makes
Voltage-stabiliser tube reverse breakdown, inductance generates electromagnetic wave and interferes read-write radiofrequency signal during voltage-stabiliser tube on and off.
6. radio frequency signal shield card according to claim 5, it is characterised in that: first voltage-stabiliser tube and the second voltage-stabiliser tube
It is identical, and respectively 15V zener diode.
7. radio frequency signal shield card according to claim 5, it is characterised in that: second coil includes two or two
More than, electric signal is connected in series between each second coil.
8. radio frequency signal shield card according to claim 7, it is characterised in that: each second coil presses coil size successively
Big coil is covered outside small coil.
9. radio frequency signal shield card according to claim 8, it is characterised in that: First Line snare is on the outside of the second coil.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811224269.2A CN109409155B (en) | 2018-10-19 | 2018-10-19 | A kind of radio frequency signal shield circuit and shield card |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811224269.2A CN109409155B (en) | 2018-10-19 | 2018-10-19 | A kind of radio frequency signal shield circuit and shield card |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109409155A CN109409155A (en) | 2019-03-01 |
| CN109409155B true CN109409155B (en) | 2019-07-23 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811224269.2A Active CN109409155B (en) | 2018-10-19 | 2018-10-19 | A kind of radio frequency signal shield circuit and shield card |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109409155B (en) |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006069144A2 (en) * | 2004-12-21 | 2006-06-29 | University Of Pittsburgh - Of The Commonwealth System Of Higher Education | Deep brain stimulation apparatus, and associated methods |
| CN104156754B (en) * | 2014-07-22 | 2017-08-25 | 赵伊宁 | The anti-theft device of non-contact IC card |
| CN204129763U (en) * | 2014-07-22 | 2015-01-28 | 赵伊宁 | The anti-theft device of non-contact IC card |
| 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 |
| CN206991351U (en) * | 2016-12-07 | 2018-02-09 | 深圳市富卡思通物联科技有限公司 | Shielding device and shield card |
| CN107749672A (en) * | 2017-09-06 | 2018-03-02 | 国网浙江杭州市余杭区供电公司 | Collection system for energy conversion |
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2018
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| CN109409155A (en) | 2019-03-01 |
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Application publication date: 20190301 Assignee: Shenzhen city Zhi Xing Technology Co. Ltd. Assignor: Hubei Core Material Union Technology Co., Ltd. Contract record no.: X2019440020013 Denomination of invention: A radio frequency signal shielding circuit and a shielding card Granted publication date: 20190723 License type: Exclusive License Record date: 20190917 |
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