CN106874810A - Field intensity adaptive circuit - Google Patents
Field intensity adaptive circuit Download PDFInfo
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- CN106874810A CN106874810A CN201510933898.2A CN201510933898A CN106874810A CN 106874810 A CN106874810 A CN 106874810A CN 201510933898 A CN201510933898 A CN 201510933898A CN 106874810 A CN106874810 A CN 106874810A
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- electric current
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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
- G06K7/08—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes
- G06K7/082—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors
- G06K7/083—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive
- G06K7/086—Methods or arrangements for sensing record carriers, e.g. for reading patterns by means detecting the change of an electrostatic or magnetic field, e.g. by detecting change of capacitance between electrodes using inductive or magnetic sensors inductive sensing passive circuit, e.g. resonant circuit transponders
-
- 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
- G06K19/07327—Passive means, e.g. Faraday cages
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Electromagnetism (AREA)
- Artificial Intelligence (AREA)
- Computer Security & Cryptography (AREA)
- General Engineering & Computer Science (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Geophysics And Detection Of Objects (AREA)
- Near-Field Transmission Systems (AREA)
Abstract
The invention discloses a kind of field intensity adaptive circuit, including：Antenna, difference coupled bleeder pipe and constant-current source；The input of logic circuit is connected with the output end of bleeder pipe, and its output end is connected with the input of constant-current source；Bleeder pipe by current forms release the energy that antenna receives subtract constant-current source institute consumed energy after excess energy, and export the electric current Warning Mark signal for representing leakage current size；After logic circuit receives electric current Warning Mark signal, the electric current Warning Mark signal is counted by certain cycle, this cycle is referred to as " measurement period "；Then the size of the constant-current source is adjusted by other a cycle, this cycle is referred to as " adjustment cycle ", and the adjustment cycle is more than or equal to measurement period.Measurement period and adjustment cycle adjust setting according to practical application scene respectively.The present invention can make full use of the energy that card reader sends, and not cause the misunderstanding of card reader to be adjusted.Suitable for passive noncontact class card power management module.
Description
Technical field
It is more particularly to a kind of to be used for nothing the present invention relates to the field of power management of passive noncontact class card
The field intensity adaptive circuit of source noncontact class card power management module.
Background technology
The power supply of passive noncontact class card (hereinafter referred to as " card ") is the electromagnetic field sent by card reader
There is provided, even if card reader can also send a carrier wave for constant amplitude when receiving, so as to card
Piece provides the energy needed for running.Card by changing the load of antenna end so that in influenceing space
Carrier wave, causes the pit of certain frequency to send number on the carrier wave of the constant amplitude sent in card reader
According to.So whether card reader there can be the signal that amplitude is changed by certain frequency in detected carrier always, have
If, the data that card sends will be considered, so as to be demodulated.
During due to card run, the different operations of correspondence have a different power consumptions, and different power consumption is from antenna
End sees, is equivalent to different loads, so will also result in the change of carrier wave, causes the mistake of card reader
Demodulation.In addition, be all fixed voltage during the work of general circuit, so change of power consumption is presented as consumption
The change of electric current.
The energy for how making full use of card reader to send, and it is exactly sheet not cause the misunderstanding of card reader to be adjusted
Invent problem to be solved.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of field intensity adaptive circuit, can make full use of
The energy that card reader sends, and do not cause the misunderstanding of card reader to be adjusted.
In order to solve the above technical problems, field intensity adaptive circuit of the invention, including：
One antenna, the bleeder pipe and a constant-current source being connected with the antenna respectively；
One logic circuit, the input of the logic circuit is connected with the output end of the bleeder pipe, should
The output end of logic circuit is connected with the input of the constant-current source；
The bleeder pipe is subtracted constant-current source and is consumed by the current forms energy that antenna receives of releasing
Excess energy after energy, and export the electric current Warning Mark signal for representing leakage current size；
After the logic circuit receives electric current Warning Mark signal, the electric current is counted by certain cycle
Warning Mark signal, this cycle is referred to as " measurement period "；Then it is described by other a cycle adjustment
The size of constant-current source, this cycle is referred to as " adjustment cycle ", and the adjustment cycle is more than or equal to measurement period；
The measurement period and adjustment cycle can respectively adjust setting according to practical application scene.
The measurement period and adjustment cycle can be respectively provided with, and its Provisioning Policy is as follows：The adjustment
The value that cycle is set is as short as possible, but can not be short to reflection on carrier wave so that allowing card reader misidentification
To be a modulated signal；And the value of measurement period should be arranged to the rate of change phase of field intensity during with application
Matching.
The strategy of the logic circuit adjustment constant-current source is as follows：The electric current indicateing arm that the bleeder pipe is given
Will signal is divided into third gear, is determined by first threshold and Second Threshold judgement, represents that electric current is big respectively, electricity
In stream, electric current is small；Logic circuit does accumulative in measurement period to the electric current Warning Mark signal,
When receive electric current Warning Mark signal for electric current it is big when, aggregate-value increase by one value, this value be called " to
Upper step value "；When in receiving electric current Warning Mark signal for electric current, aggregate-value is constant；When receiving electricity
Stream Warning Mark signal is electric current hour, and aggregate-value reduces a value, and this value is called " to be stepped down by
Value "；Then within an adjustment cycle, the aggregate-value in the recent statistics cycle is compared, if greater than
Three threshold values, then output control signal make constant-current source current value increase by one grade；If less than the 4th threshold value,
Then output control signal makes the current value of constant-current source reduce one grade；If in the 3rd threshold value and the 4th threshold value
Between, then the current value not to constant-current source adjusts；Wherein, the 3rd threshold value is more than the 4th threshold value.
The reiving/transmitting state marking signal control that the enable of the logic circuit is gone out by functional circuit, when the receipts
Hair-like state marking signal represents functional circuit in transceiving data, then logic circuit is enabled and closed, only
State before holding.
The first threshold, Second Threshold, the 3rd threshold value, the 4th threshold value steps up value, downwards
Step value can adjust setting to obtain optimal performance.
Advantageous Effects of the invention：Using passive noncontact class card of the invention, can ensure
On the premise of card reader does not occur to misread tune, adaptively the functional circuit to card provides as many as possible
Operating current, in general, the operating current of circuit is bigger, and the performance of its work is better.This
Sample invention can just allow card adaptively under various field intensity, obtain optimal service behaviour.
Brief description of the drawings
The present invention is further detailed explanation with specific embodiment below in conjunction with the accompanying drawings：
Fig. 1 is the structured flowchart of the field intensity adaptive circuit；
Fig. 2 is the connection diagram of field intensity adaptive circuit shown in Fig. 1 and other functional circuits in system.
Specific embodiment
Shown in Figure 1, the field intensity adaptive circuit is connected to day with a constant-current source as load
Line, electric current when being worked due to constant-current source is constant, so the load seen from antenna end is exactly permanent
Fixed.Because the electromagnetic field intensity that antenna is received is indefinite, it is possible to the electric current obtained after conversion
More than the operating current of constant-current source, so being accomplished by being released in the side of constant-current source one one bleeder pipe of parallel connection
Unnecessary circuit；When antenna receives operating current of the electric current less than constant-current source obtained after electromagnetic field is changed
When, in addition it is also necessary to the operating current of constant-current source is adjusted, the control of this part is just completed by logic circuit.
With reference to shown in Fig. 2, the functional circuit in passive noncontact class card application system all hangs over constant-current source
Below, and also a bleeder pipe in parallel, unwanted currents of releasing.Under this configuration, as long as ensureing
Corresponding electric current when the electric current of functional circuit consumption works less than constant-current source, then due to the resistance of constant-current source
Every the change of power consumption of functional circuit would not be reacted on antenna, would not also cause the change on carrier wave
Change.
There can be better performance to allow functional circuit, it is necessary to more power to functional circuit.Base
In above structure, the operating current of the power consumption no more than constant-current source of functional circuit, so constant-current source
Operating current just should be as high as possible, but can not above antenna and be converted to most from electromagnetic field
High current.This is accomplished by the size according to electromagnetic field come the operating current of real-time adjustment constant-current source.
The field intensity adaptive circuit gives the implementation for completing above-mentioned adjustment function.First, institute
State the electric current Warning Mark signal that bleeder pipe provides and be divided into third gear, respectively：First grade (represents electric current
Greatly), second gear (in expression electric current), third gear (represents that electric current is small), and above-mentioned third gear is by first threshold
Divided with Second Threshold.When the electric current Warning Mark signal that bleeder pipe is given is big electric current, day is represented
The electric current that line is converted to from electromagnetic field also has than larger affluence, so the operating current of constant-current source
Can raise in the past；When the electric current Warning Mark signal that bleeder pipe is given is electric current hour, antenna is represented
The electric current being converted to from electromagnetic field is almost used up, due to future time instance electromagnetic field intensity change not
Know, for the electric current that the operating current for ensureing constant-current source is necessarily converted to less than antenna from electromagnetic field,
The operating current of constant-current source is accomplished by toward downward；When the electric current Warning Mark signal that bleeder pipe is given is electricity
When in stream, the electric current positive match that the operating current and antenna for representing constant-current source are converted to from electromagnetic field,
So not adjusting.It is corresponding between two grades of first threshold here and the value of Second Threshold and constant-current source
Operating current difference is relevant, and the difference of corresponding operating current is referred to as " work electricity between two grades of constant-current source
Stream step value ", proper setting is that first threshold is equal to operating current step value, Second Threshold
It is approximately equal to 2 times of operating current step value.Because when rich electric current has 2 times of operating current
During step value, then constant-current source is heightened 1 grade is exactly so as to allow the operating current of constant-current source to increase by 1 grade
Safety；If rich electric current is less than operating current step value, then illustrate the work of present constant-current source
Make electric current compared with field intensity just, but due to the uncertainty of following field intensity size, in order to ensure energy
The operating current of constant-current source is consistently less than the electric current that antenna is converted to from electromagnetic field, it is necessary to permanent
The operating current in stream source down adjusts 1 grade.
The electric current Warning Mark signal that the bleeder pipe is given be it is real-time, but constant-current source operating current
But it is unable to real-time adjustment.Because if the operating current of real-time adjustment constant-current source, then this
Individual constant-current source is not just dead load for antenna, and its curent change will be reacted on antenna,
So as to the change for causing carrier wave causes the misunderstanding of card reader to adjust.So being accomplished by being gone by a logic circuit
The electric current Warning Mark signal of certain hour length is counted, then by certain period modulation constant-current source
Operating current, here it is the origin in measurement period and adjustment cycle.The value of measurement period should be arranged to
Using when field intensity rate of change match, if the field intensity change of application scenarios is than very fast, then system
The meter cycle is corresponding also just relatively shorter, whereas if the field intensity change of application scenarios is slow, then
Measurement period is corresponding also just long.For the adjustment cycle, the adjustment cycle is faster, then work as field intensity
When becoming big, the operating current of constant-current source just can be more quickly adjusted, allow functional circuit to be operated in property high as early as possible
Energy state, based on this reason, the adjustment cycle should be as short as possible, but can not be too short, so as not to
The change of carrier wave is caused to cause the misunderstanding of card reader to adjust.
Statistics electric current Warning Mark signal is by statistics electric current Warning Mark signal pair in the counting statistics cycle
The aggregate-value answered is embodied.Concrete scheme is：Believe when the big electric current Warning Mark of electric current is received
Number when, aggregate-value increase by one value, this value is called " stepping up value "；Electricity in electric current is received
During stream Warning Mark signal, aggregate-value is constant；When the small electric current Warning Mark signal of electric current is received,
Aggregate-value reduces a value, and this value is called " being stepped down by value ".The last of cycle is adjusted at one,
The aggregate-value seen in the recent statistics cycle, if aggregate-value is more than the 3rd threshold value, then just provide control
Signal increases one grade by the current value of constant-current source；If less than the 4th threshold value, then just provide control signal
The current value of constant-current source is allowed to subtract one grade；If between the 3rd threshold value and the 4th threshold value, then just not right
The current value of constant-current source adjusts." stepping up value " and " being stepped down by value " is above-mentioned in order to make up
First threshold and Second Threshold inaccurate and set.Because first threshold and Second Threshold will be in moulds
Intend being set in the bleeder pipe of circuit realiration, but because analog circuit can be subject to process deviation shadow in production
Ring, operationally easily influenceed by ambient noise interference again, so not ensuring that the two values
Accuracy.Work as first threshold, when Second Threshold is unstable under actual chips, actual operative scenario,
Can be made up by adjusting " stepping up value " and " being stepped down by value ".Compensating mode is so
, if first threshold is less than normal, this just illustrates that the value that actual current value ratio is expected to characterize is lower,
Influence so to the aggregate-value of integrating instrument will be increased, because first threshold provides the small electric current of electric current
Warning Mark signal, the small electric current Warning Mark signal of this electric current is again and " being stepped down by value " phase
Coordinate, so when first threshold is less than normal it is necessary to increase " being stepped down by value "；, whereas if first
Threshold value is bigger than normal, then will reduce " being stepped down by value "；Similarly, Second Threshold provides the big electricity of electric current
Warning Mark signal is flowed, the big electric current Warning Mark signal of this electric current is again and " stepping up value "
It is engaged, so when Second Threshold is bigger than normal, just illustrating that actual current value ratio is expected what is characterized
Value is higher, then the influence to the aggregate-value of integrating instrument will be increased it is necessary to increase " stepping up value "；
, whereas if Second Threshold is less than normal, then will reduce " stepping up value ".3rd threshold value and the 4th
Threshold value can also play similar effect, when first threshold is less than normal, if not increasing " being stepped down by value ",
So reducing the 4th threshold value can also play similar effect；When equally Second Threshold is bigger than normal, if do not increased
" step up value " greatly, then the 3rd threshold value of increase can also play similar effect；Increase by the 3rd threshold value,
4th threshold value the two can a kind of setting parameter benefit adjustment means that have been many.Above-mentioned these settable parameters
Means are provided to better adapt to various application scenarios using the field intensity adaptive circuit.
Further, since during transceiver communication, field intensity can be influenceed by transceiving data, electric current inspection now
Mark will is just forbidden, so the logic for realizing above adjustable strategies should be closed during transceiving data
Circuit, it is to avoid the adjustment of mistake.
The present invention has been described in detail above by specific embodiment, but these are not constituted
Limitation of the present invention.Without departing from the principles of the present invention, those skilled in the art may be used also
Many deformations and improvement are made, these also should be regarded as protection scope of the present invention.
Claims (5)
1. a kind of field intensity adaptive circuit, it is characterised in that including：
One antenna, the bleeder pipe and a constant-current source being connected with the antenna respectively；
One logic circuit, the input of the logic circuit is connected with the output end of the bleeder pipe, should
The output end of logic circuit is connected with the input of the constant-current source；
The bleeder pipe is subtracted constant-current source and is consumed by the current forms energy that antenna receives of releasing
Excess energy after energy, and export the electric current Warning Mark signal for representing leakage current size；
After the logic circuit receives electric current Warning Mark signal, the electric current is counted by certain cycle
Warning Mark signal, this cycle is referred to as " measurement period "；Then it is described by other a cycle adjustment
The size of constant-current source, this cycle is referred to as " adjustment cycle ", and the adjustment cycle is more than or equal to measurement period；
The measurement period and adjustment cycle can respectively adjust setting according to practical application scene.
2. field intensity adaptive circuit as claimed in claim 1, it is characterised in that：The measurement period
Can be respectively provided with the adjustment cycle, its Provisioning Policy is as follows：The arranges value in the adjustment cycle will make
It is short to and is reflected on carrier wave so that allowing the card reader can not to be erroneously interpreted as a modulated signal；And unite
The rate of change that the value in meter cycle should be arranged to field intensity during with application matches.
3. field intensity adaptive circuit as claimed in claim 1, it is characterised in that：The logic circuit
The strategy of adjustment constant-current source is as follows：The electric current Warning Mark signal that the bleeder pipe is given is divided into third gear,
Determined by first threshold and Second Threshold judgement, represent that electric current is big respectively, in electric current, electric current is small；Patrol
Volume circuit does accumulative in measurement period to the electric current Warning Mark signal, when receiving electric current indicateing arm
When will signal is big electric current, aggregate-value increases a value, and this value is called " stepping up value "；Work as receipts
When in being electric current to electric current Warning Mark signal, aggregate-value is constant；When receiving electric current Warning Mark signal
It is electric current hour, aggregate-value reduces a value, and this value is called " being stepped down by value "；Then at one
In the adjustment cycle, compare the aggregate-value in the recent statistics cycle, if greater than the 3rd threshold value, then export
Control signal makes the current value of constant-current source increase by one grade；If less than the 4th threshold value, then output control letter
The current value of constant-current source number is set to reduce one grade；If not right between the 3rd threshold value and the 4th threshold value
The current value of constant-current source adjusts；Wherein, the 3rd threshold value is more than the 4th threshold value.
4. the field intensity adaptive circuit as described in claim 1 or 3, it is characterised in that：The logic
The reiving/transmitting state marking signal control that the enable of circuit is gone out by functional circuit, when reiving/transmitting state mark letter
In transceiving data, then logic circuit is enabled and closed, the shape before only keeping for number expression functional circuit
State.
5. field intensity adaptive circuit as claimed in claim 3, it is characterised in that：The first threshold,
Second Threshold, the 3rd threshold value, the 4th threshold value steps up value, is stepped down by value and can adjust to set
Put to obtain optimal performance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510933898.2A CN106874810B (en) | 2015-12-14 | 2015-12-14 | Field strength adaptive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510933898.2A CN106874810B (en) | 2015-12-14 | 2015-12-14 | Field strength adaptive circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106874810A true CN106874810A (en) | 2017-06-20 |
| CN106874810B CN106874810B (en) | 2019-05-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510933898.2A Active CN106874810B (en) | 2015-12-14 | 2015-12-14 | Field strength adaptive circuit |
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| CN201671782U (en) * | 2010-04-28 | 2010-12-15 | 大庆清源水处理技术有限公司 | Constant-flow control system |
| CN102103387A (en) * | 2009-12-18 | 2011-06-22 | 上海华虹集成电路有限责任公司 | Voltage stabilizing circuit adaptive to current balance |
| CN202120271U (en) * | 2011-05-05 | 2012-01-18 | 张维 | Field intensity tuner and electronic tag reading apparatus using same |
| CN102427262A (en) * | 2011-12-13 | 2012-04-25 | 南京理工大学 | Elevator braking energy feedback and control system based on super capacitor |
| CN103065182A (en) * | 2011-10-19 | 2013-04-24 | 国民技术股份有限公司 | Module and method for field intensity self-adaption and non-contact integrated circuit (IC) card |
| CN104063674A (en) * | 2013-03-22 | 2014-09-24 | 国民技术股份有限公司 | Field intensity self-adaption circuit and method and smart card |
-
2015
- 2015-12-14 CN CN201510933898.2A patent/CN106874810B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102103387A (en) * | 2009-12-18 | 2011-06-22 | 上海华虹集成电路有限责任公司 | Voltage stabilizing circuit adaptive to current balance |
| CN201671782U (en) * | 2010-04-28 | 2010-12-15 | 大庆清源水处理技术有限公司 | Constant-flow control system |
| CN202120271U (en) * | 2011-05-05 | 2012-01-18 | 张维 | Field intensity tuner and electronic tag reading apparatus using same |
| CN103065182A (en) * | 2011-10-19 | 2013-04-24 | 国民技术股份有限公司 | Module and method for field intensity self-adaption and non-contact integrated circuit (IC) card |
| CN102427262A (en) * | 2011-12-13 | 2012-04-25 | 南京理工大学 | Elevator braking energy feedback and control system based on super capacitor |
| CN104063674A (en) * | 2013-03-22 | 2014-09-24 | 国民技术股份有限公司 | Field intensity self-adaption circuit and method and smart card |
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| CN106874810B (en) | 2019-05-14 |
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