CN100334595C - Circuit device with power supplied by electromagnetic filed - Google Patents
Circuit device with power supplied by electromagnetic filed Download PDFInfo
- Publication number
- CN100334595C CN100334595C CNB2004100020478A CN200410002047A CN100334595C CN 100334595 C CN100334595 C CN 100334595C CN B2004100020478 A CNB2004100020478 A CN B2004100020478A CN 200410002047 A CN200410002047 A CN 200410002047A CN 100334595 C CN100334595 C CN 100334595C
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- CN
- China
- Prior art keywords
- circuit arrangement
- antenna
- transponder
- electromagnetic field
- impedance
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
- H02J50/27—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves characterised by the type of receiving antennas, e.g. rectennas
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J50/00—Circuit arrangements or systems for wireless supply or distribution of electric power
- H02J50/20—Circuit arrangements or systems for wireless supply or distribution of electric power using microwaves or radio frequency waves
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S13/00—Systems using the reflection or reradiation of radio waves, e.g. radar systems; Analogous systems using reflection or reradiation of waves whose nature or wavelength is irrelevant or unspecified
- G01S13/74—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems
- G01S13/75—Systems using reradiation of radio waves, e.g. secondary radar systems; Analogous systems using transponders powered from received waves, e.g. using passive transponders, or using passive reflectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/59—Responders; Transponders
Abstract
The circuit is equipped with an antenna AT provided with two connecting terminals AP1, AP2 and a detuning unit DE loop-connected between the connecting terminals AP1, AP2 for limiting the electric power extracted from the electromagnetic field by the antenna AT. The detuning unit DE then has components D1, D2, CV each of which impedance is changed depending on the electromagnetic field strength of the electromagnetic field generated in the antenna AT.
Description
Technical field
The present invention relates to a kind of electromagnetic field of high frequency by base station provides the circuit arrangement of electric power, is used for based on backward scattering, especially passive transponder.
Background technology
Such circuit arrangement for example is used for the transponder (Transponder) of contactless recognition system (rfid system) and is used for distance sensor, so that make identifying information or heat transfer agent be sent to a base station non-contactly or read the station from transponder or sensor.When mentioning transponder, distance sensor also should be included when following.
Transponder or its transmission and receiving trap do not have the active transmitter that is used for transmitting to the base station data usually.This non-active system is called as passive system when it does not have the energy supply of itself; The energy that has itself when it is supplied with, and then is called as half passive system, in this system, uses so-called backward scattering or backscattering coupling usually for the data transmission that interrelates with UHF (ultrahigh frequency) or microwave in the remote zone of base station.For this reason will be from the base station electromagnetic wave, these electromagnetic waves are treated to modulate and reflection with a kind of modulator approach to the data of base station transmits by the transmission and the receiving trap basis of transponder.By sending and the change of the input impedance of receiving trap produces, it will cause the variation of the reflection characteristic of the antenna that is connected with it usually for this.
To the requirement of transmission range, especially for passive transponder, constantly improve.In order on passive transponder, to realize high transmission range, antenna or the circuit that is connected with antenna must be decided parameter adaptedly, even and the rectifier of the alternating signal received by antenna of reception very little voltage transitions must be become enough operating voltage.But high like this sensitivity meeting in the near zone of base station-because the high field intensity that exists here-cause the damage of rectifier or other circuit part.For example nearby in the zone rectifier produce a too high voltage, this voltage is limited by voltage regulator at its output terminal, embodiment on voltage regulator may be caused the electric current that becomes big calmly in rectifier, this may cause surpassing its peak power and cause its damage thus.
In order to be limited in the near zone power that receives by antenna, carry out the so-called detuning of the input circuit that is connected with antenna, i.e. mismatch.This mismatch will cause the increase of reflective power component and cause the decline of absorbed power component.
This will realize by the detuning unit in traditional system, and it uses a kind of modulator with amplitude-shift keying (ASK), the real part of the circuit part that this modulator will be connected with antenna for mismatch will change or the input impedance of importation.The ASK modulator is located in the importation or as additional load resistance for this reason and is located at rectifier output end.The sort circuit device is for example open by EP 1,211 635 A2.But it is the high real part of comparing with imaginary part with input impedance is prerequisite.At this, by a regulator control that is located in the detuning unit, this regulator causes suitable mismatch according to being regulated by the working point of ASK modulator by the power of antenna feed-in to the ASK modulator except that the ASK modulator control signal.When using phase-shift keying (PSK)-modulation for the data transmission between transponder and the base station, it is a prerequisite with the little real part of comparing with imaginary part of input impedance.Therefore, regulating mismatch for the change by real part must be by a circuit arrangement, for example transistor produces a low ohmic resistance on the output terminal of importation or rectifier a path.The circuit arrangement of this low ohmic resistance has bigger parasitic parameter usually, and it can cause corresponding loss in routine work, and transmission range is reduced.Therefore for transmit the common PSK modulation of data can not with based on the variation of the real part of input impedance, promptly based on the detuning unit combination of ASK modulation.
Disclose by DE 196 29 291 A1: the diode of two reverse parallel connections is set in the input circuit of a transponder, is used for Electrostatic Discharge-protection.At this, these diodes are conducting when making input voltage surpass diode threshold owing to the ESD interference for example.And there do not have to produce the power relevant with field intensity here to be adaptive.
Summary of the invention
The present invention based on technical matters be, provide a kind of electromagnetic field of high frequency by base station provide electric power, be used for circuit arrangement based on the transponder of backward scattering, it also can guarantee enough supply voltages in the far-field region of electromagnetic field, and power-limiting input in this wise in the near region, so that the damage of parts or fault can be avoided.
The problems referred to above are solved like this, promptly, the present invention proposes a kind of electromagnetic field of high frequency by base station provides the circuit arrangement of electric power, be used for based on backward scattering, especially passive transponder, this circuit arrangement has one and has two antennas that connect the utmost point, a detuning unit that is used to limit the power of obtaining from electromagnetic field by described antenna, it is connected these and connects between the utmost point, the frequency of this electromagnetic field is in the scope of 300MHz to 3000MHz, wherein, the detuning unit comprises parts, and its impedance changes according to the field intensity of the electromagnetic field that exists on antenna.
In installing in a circuit according to the invention, the detuning unit comprises parts, and its impedance changes according to the field intensity of the electromagnetic field that exists on antenna.For example can accomplish thus and when medium and little field intensity, to select the impedance of these parts like this, on its antenna terminal so that the input impedance of the transponder that is produced can realize the work that power is adaptive.It is relatively little that field intensity in the remote zone of base station changes the impedance variation that reaches thus, therefore approximately preponderates so that power is adaptive in the whole here zone.When the field intensity that exists on the antenna in the near zone of base station increased very doughtily, the impedance of these parts changed very doughtily, and the input impedance that is produced of the circuit part that is connected with antenna is also changed very doughtily.This makes antenna mismatch and the power of obtaining from electromagnetic field is descended very doughtily very doughtily.Power input excessive at the circuit part that connects, as rectifier then can be avoided.In remote zone, antenna is worked adaptedly and the circuit part that connects is provided the peak power of being drawn by electromagnetic field.
Because the real part of input impedance and imaginary part can be according to the strong variation of power input by the mismatch realization, the implementation of this mismatch has when power input raises greatly effectively that power reduces with comparing based on the detuning unit of ASK, because with based on the detuning unit of ASK on the contrary, not only the real part of input impedance but also imaginary part also change here.The modulator or the pull-up resistor that use in the ASK modulation can be removed, when being arranged on the importation, this modulator or pull-up resistor, and can cause the variation of remote zone characteristic when this modulator or pull-up resistor being arranged on the output terminal of rectifier because its parasitic character has spinoff to the importation quality.Equally also do not need to be used to control the regulator of ASK modulator, it is according to the suitable mismatch of feed-in power adjustments.Generally this will cause simpler design, the saving of chip area, the significantly improving of the reduction of cost and functional reliability.
In a further configuration of circuit arrangement, the frequency of electromagnetic field is in the scope of 400MHz to 2450MHz.In this frequency range, have parts traditional, that the enough impedance variation relevant with field intensity arranged.
In a further configuration of circuit arrangement, the variation of the impedance of described parts is that the change by the imaginary part of this impedance causes basically.
In a further configuration of circuit arrangement, these parts are variable reactors, especially have the variable reactor of high quality factor.But variable reactor is simple realization or integrated element, and their electric capacity is relevant with voltage.By high quality factor is that little resistive component can reduce the power consumption that caused by these parts.
In a further configuration of circuit arrangement, the detuning unit comprises two varactors, especially has the varactor of high quality factor, and they connect on reverse parallel connection ground each other.Can additionally realize the Electrostatic Discharge protection by this connection.
In a further configuration of circuit arrangement, the detuning unit comprises the variable reactor control device, and they are configured to control described one or more variable reactor relatively with field intensity.According to a favourable configuration, the detuning unit advantageously comprises one first capacitor, a variable reactor and one second capacitor, and they are connected in series between the connection utmost point of described antenna.These variable reactor control device are configured to provide the control voltage relevant with field intensity to described one or more variable reactors.
In a further configuration of circuit arrangement, on the output terminal of the rectifier that a connection that is connected antenna is extremely gone up, connecting a voltage limiting circuit.This voltage limiting circuit for example is the series diode form, and it provides superpotential supplementary protection and has caused the raising of functional reliability and the protection of anti-damage.
In a further configuration of circuit arrangement, this circuit arrangement is integrated in the transponder.Advantageously, this transponder be one passive, promptly do not have a transponder of the own energy.
In a further configuration of circuit arrangement, transponder has a modulating device that is used for Data transmission, and this modulating device is modulated the electromagnetic wave that is received by antenna according to data to be transmitted.Advantageously, this modulating device can be configured for the phase-shift keying modulation.The real part of input impedance much lower than in the amplitude-shift keying in phase-shift keying modulation, promptly by as traditional detuning of the working point of the ASK modulator in ASK modulation adjusting is difficult to accomplish.Certainly, device can make up with traditional ASK modulation phase in a circuit according to the invention.
Description of drawings
Express an advantageous forms of implementation of the present invention in the accompanying drawings and will be described below.Accompanying drawing is represented:
Fig. 1: one provides the general block diagram of the circuit arrangement of electric power by electromagnetic field, and this circuit arrangement is integrated among the passive transponder tango R,
Fig. 2: the curve map of the real part of the input impedance of circuit arrangement and imaginary part and power input relation among Fig. 1,
Fig. 3: one provides the general block diagram of the circuit arrangement of electric power, this circuit arrangement to be integrated among the passive transponder tango R1 by electromagnetic field and has the variable reactor control device that is used for carrying out relatively with field intensity variable reactor control.
Embodiment
Fig. 1 represents that one provides the general block diagram of the circuit arrangement of electric power by electromagnetic field, and this circuit arrangement is integrated among the passive transponder tango R.
Shown circuit arrangement comprises: one has two antenna AT that connect utmost point AP1 and AP2, one is connected the varactor D1 of the high quality factors with identical characteristics parameter between connection utmost point AP1 and the AP2, two reverse parallel connections and the detuning cells D E of D2 form, a modulating device ME, a rectifier GL and a voltage limitator SB.
In order to power to passive balise TR, antenna AT is from an electromagnetic field take-off output, and this electromagnetic field is by a unshowned base station.In order in the far-field region, to provide enough power, select two input impedance ZE that connect the transponder between utmost point AP1 and the AP2 in this wise, so that produce power match by this electromagnetic field.Prerequisite to this is, the real part that the value of the imaginary part of antenna impedance equals the value of imaginary part of input impedance ZE of transponder and antenna impedance equals the real part of the input impedance ZE of transponder.At this, determine the parameter of varactor D1 and D2 in this wise, promptly in the far-field region, produce corresponding input impedance ZE.
The varactor D1 of these two reverse parallel connections and D2 directly are connected between the connection utmost point AP1 and AP2 of antenna AT, but they also can be connected on the another location of antenna input circuit.
When the field intensity that exists on the antenna in the near region in the base station increases very doughtily, the electric capacity of varactor D1 and D2 changes and changes very doughtily thus the imaginary part of its impedance very doughtily, changes the especially imaginary part of the input impedance ZE of transponder thus very doughtily.This will cause the mismatch of antenna, and the power of obtaining from electromagnetic field is descended.Described effect is based on the high frequency characteristics of varactor D1 and D2, they in employed frequency range not for another example conventional diode work like that, the latter begins conducting from certain threshold voltage.
Varactor D1 and D2 be also simultaneously as the esd protection of deriving the interference voltage that is caused by ESD (static discharge), because not conducting under the voltage condition that varactor D1 and D2 occur during noiseless work in input circuit.Tackle in the layout of varactor D1 and D2 selection symmetry in order to optimize anti-ESD interference intensity.
Fig. 2 illustrates the real part of input impedance ZE of circuit arrangement among Fig. 1 and the curve map of imaginary part and field intensity relation.As appreciable from this curve map, the imaginary part of input impedance descends very doughtily when surpassing certain field intensity, and in contrast, real part increases and roughly keeps constant then.This variation of the real part of input impedance ZE and imaginary part is compared with the detuning unit based on ASK, when raising, field intensity will cause that greatly effectively power reduces, because not only the real part of input impedance ZE but also imaginary part also change on the contrary in this and traditional detuning unit.Yet the change of imaginary part plays a decisive role for mismatch, and is much better than because imaginary part is compared its variation with real part.
Modulating device ME connects between utmost point AP1 and the AP2 and produces the output signal of a phase modulation (PM) for data being sent to the base station by input signal being connected on the outgoing side of detuning cells D E, and this output signal is launched and is received by the base station as backscattering or backward scattering signal by antenna AT.
Rectifier GL is being connected between connection utmost point AP1 and the AP2 and is being used for the transponder service voltage on the outgoing side of modulating device ME.The output voltage of rectifier GL is by voltage limitator SB pressure limiting, and this voltage limitator can be realized by the series circuit of diode.
Fig. 3 represents to be provided by electromagnetic field the general block diagram of a replacement circuit device of electric power, and this circuit arrangement is integrated among the passive transponder tango R1.
Shown circuit arrangement is except that the detuning cells D E1 that comprises also that the unit with same numeral described in Fig. 1 a conversion ground constitutes.This detuning unit comprises one first capacitor C1, a variable reactor CV and one second capacitor C2, and they are connected in series and are connecting between utmost point AP1 and the AP2.
Detuning cells D E1 also comprises a PSK modulating device ME1, and it is in order to send data to the output signal of base station by a phase modulation (PM) of input signal generation, and this output signal is launched and is received by the base station as backscattering or backward scattering signal by antenna AT.For the variation by input impedance ZE produces different phase places, modulating device ME1 comprises the variable reactor control device VS of a controllable voltage source form, and it applies a control voltage U S according to data to be transmitted to variable reactor, to change its electric capacity.
A device that is fit to this modulator approach of enforcement for example is described in the applicant's the German patent application formerly 10158442.3, and it is hereby expressly incorporated by the reference of teachings herein.
Except data transmitted, this variable reactor control device also was used for controlling variable reactor CV relatively with field intensity.Unshowned by one, as to be suitable for this detection field intensity detection and control module detect the field intensity information S that goes up field intensity about antenna AT, and supply among the modulating device ME1, this modulating device is regulated by the working point of PSK modulator according to this information and is caused a suitable mismatch.With circuit arrangement shown in Fig. 1 differently, the electric capacity of variable reactor is not self-regulating according to field intensity here, but is regulated by variable reactor control device VS according to the field intensity that detects.
Modulating device ME1 is integrated among the detuning cells D E1 in the embodiment shown, but it also can be implemented dividually with the detuning unit.
Shown circuit arrangement can be realized transponder reliable and anti-tamper ground work in by the electromagnetic near zone of base station and far-field region, wherein because the PSK that uses in transponder modulation can realize high transmission range and big antijamming capability.
Be appreciated that the present invention also can not be integrated in the transponder and is integrated in the parts, for example remote sensor of other wireless supply power.
The present invention also can comprise half passive application in addition, and a part that wherein only is the parts power demand is wirelessly by the antenna input, and remaining power requirement satisfies from other approach.
Claims (15)
1. the electromagnetic field of high frequency by base station provides the circuit arrangement of electric power, is used for the transponder based on backward scattering, has:
One have two connect the utmost points (AP1, antenna AP2) (AT),
A detuning unit (DE) that is used for the power that restriction obtains from electromagnetic field by described antenna (AT), this detuning unit be connected these connect utmost points (AP1, AP2) between,
It is characterized in that:
The frequency of this electromagnetic field reaches in the scope of 300MHz to 3000MHz
Detuning unit (DE) comprises that (CV), the impedance of these parts changes according to the field intensity that goes up the electromagnetic field that exists at antenna (AT) parts for D1, D2.
2. according to the circuit arrangement of claim 1, it is characterized in that: these parts are connected these and connect between the utmost point.
3. according to the circuit arrangement of claim 1 or 2, (variation of impedance CV) is that the change by the imaginary part of this impedance causes to its feature basically for D1, D2 in: these parts.
4. according to the circuit arrangement of claim 1 or 2, it is characterized in that: these parts be a varactor (D1, D2, CV).
5. according to the circuit arrangement of claim 1 or 2, it is characterized in that: the detuning unit comprises that (D1, D2), they connect on reverse parallel connection ground two varactors each other.
6. according to the circuit arrangement of claim 4, it is characterized in that: detuning unit (DE) comprises variable reactor control device (VS), and it is configured to control one or more variable reactors (CV) relatively with field intensity.
7. according to the circuit arrangement of claim 6, it is characterized in that: detuning unit (DE) comprises one first capacitor (C1), a variable reactor (CV) and one second capacitor (C2), they are connected in series and are connecting the utmost point (AP1, AP2) between, and variable reactor control device (VS) is configured to provide the control voltage relevant with field intensity to described one or more variable reactors (CV).
8. according to the circuit arrangement of claim 1 or 2, it is characterized in that: (AP1 AP2) is connecting a voltage limiting circuit (SB) on the output terminal of the rectifier on (GL) at a connection utmost point that is connected antenna (AT).
9. according to the circuit arrangement of claim 1 or 2, it is characterized in that: this circuit arrangement be integrated in a transponder (TR, TR1) in.
10. according to the circuit arrangement of claim 9, it is characterized in that: (TR TR1) has one and is used for modulating device to the base station Data transmission (ME, ME1), this modulating device is modulated the electromagnetic wave that is received by antenna according to data to be transmitted transponder.
11. the circuit arrangement according to claim 10 is characterized in that: (ME ME1) is configured for phase-shift keying to this modulating device.
12. the circuit arrangement according to claim 1 is characterized in that: this circuit arrangement is used for based on backward scattering, passive transponder.
13. the circuit arrangement according to claim 1 is characterized in that: the frequency of this electromagnetic field is in the scope of 400MHz to 2450MHz.
14. the circuit arrangement according to claim 5 is characterized in that: described two varactors have high quality factor.
15. the circuit arrangement according to claim 1 or 2 is characterized in that: this circuit arrangement is integrated in the passive balise.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10301452.7 | 2003-01-10 | ||
| DE10301452 | 2003-01-10 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1534308A CN1534308A (en) | 2004-10-06 |
| CN100334595C true CN100334595C (en) | 2007-08-29 |
Family
ID=32520000
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100020478A Expired - Fee Related CN100334595C (en) | 2003-01-10 | 2004-01-09 | Circuit device with power supplied by electromagnetic filed |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100334595C (en) |
| DE (1) | DE10357665A1 (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101385040B (en) | 2005-12-15 | 2012-08-08 | Nxp股份有限公司 | Radio frequency interface circuit for a radio frequency identification tag |
| KR100732681B1 (en) * | 2006-01-20 | 2007-06-27 | 삼성전자주식회사 | Radio frequency identification tag and rfid system having the same |
| CN102754355B (en) * | 2011-05-26 | 2014-04-30 | 华为技术有限公司 | Responder detection method and responder detection system |
| IN2014CN02299A (en) * | 2011-10-10 | 2015-06-19 | Koninkl Philips Nv | |
| WO2015141117A1 (en) * | 2014-03-17 | 2015-09-24 | パナソニックＩｐマネジメント株式会社 | Wireless apparatus |
| US9755679B1 (en) * | 2016-07-08 | 2017-09-05 | Nxp B.V. | Load dependent receiver configuration |
| JP2020086861A (en) * | 2018-11-22 | 2020-06-04 | アズビル株式会社 | Wireless sensor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1036115A (en) * | 1988-03-26 | 1989-10-04 | 三角洲国际有限公司 | Electronic data communications system |
| EP0829940A2 (en) * | 1996-09-13 | 1998-03-18 | Hitachi, Ltd. | Power transmission system, IC card and information communication system using IC card |
| GB2321726A (en) * | 1997-01-30 | 1998-08-05 | Motorola Inc | Apparatus and method for regulating power on a contactless portable data carrier |
| FR2782209A1 (en) * | 1998-08-06 | 2000-02-11 | Innovatron Electronique | Inductively-read transponder for access control or payment, switches in capacitor to detune resonant circuit if supply voltage derived from read signal is excessive |
| EP1018692A2 (en) * | 1999-01-08 | 2000-07-12 | Anatoli Stobbe | Security system, transponder and receiving device |
| EP1045336A1 (en) * | 1999-04-07 | 2000-10-18 | STMicroelectronics SA | Close-coupled method of operation of an electromagnetic transpondersystem |
-
2003
- 2003-12-04 DE DE10357665A patent/DE10357665A1/en not_active Withdrawn
-
2004
- 2004-01-09 CN CNB2004100020478A patent/CN100334595C/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1036115A (en) * | 1988-03-26 | 1989-10-04 | 三角洲国际有限公司 | Electronic data communications system |
| EP0829940A2 (en) * | 1996-09-13 | 1998-03-18 | Hitachi, Ltd. | Power transmission system, IC card and information communication system using IC card |
| GB2321726A (en) * | 1997-01-30 | 1998-08-05 | Motorola Inc | Apparatus and method for regulating power on a contactless portable data carrier |
| FR2782209A1 (en) * | 1998-08-06 | 2000-02-11 | Innovatron Electronique | Inductively-read transponder for access control or payment, switches in capacitor to detune resonant circuit if supply voltage derived from read signal is excessive |
| EP1018692A2 (en) * | 1999-01-08 | 2000-07-12 | Anatoli Stobbe | Security system, transponder and receiving device |
| EP1045336A1 (en) * | 1999-04-07 | 2000-10-18 | STMicroelectronics SA | Close-coupled method of operation of an electromagnetic transpondersystem |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1534308A (en) | 2004-10-06 |
| DE10357665A1 (en) | 2004-07-22 |
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Granted publication date: 20070829 Termination date: 20140109 |