CN100349170C - Modulation circuit for non-contact IC card reading apparatus - Google Patents
Modulation circuit for non-contact IC card reading apparatus Download PDFInfo
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- CN100349170C CN100349170C CNB2005100087858A CN200510008785A CN100349170C CN 100349170 C CN100349170 C CN 100349170C CN B2005100087858 A CNB2005100087858 A CN B2005100087858A CN 200510008785 A CN200510008785 A CN 200510008785A CN 100349170 C CN100349170 C CN 100349170C
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Abstract
The present invention relates to a modulation circuit used for non-contact IC card reading equipment, which belongs to the technical field of IC cards. The modulation circuit of the present invention comprises a reference voltage unit and a compensation modulating unit, wherein the reference voltage unit and the compensation modulating unit are orderly connected in series and are supplied with power by input voltage; modulation depth controlling signals are transmitted to the reference voltage unit to generate the variation of the reference voltage, and after carrying out compensation modulation, the compensation modulating unit outputs modulation voltage. Compared with the prior art, the present invention has the characteristics of convenient operation, high testing efficiency and fine real-time performance.
Description
Technical field
The present invention relates to the IC-card technical field, especially for the modulation circuit that can continuously change the AM depth of modulation in the test/card-reading apparatus of contactless IC card.
Background technology
The radio-frequency field that contactless IC card produces by coupling test/card-reading apparatus obtains the required energy of self work, the signal that acceptance test simultaneously/card-reading apparatus sends.Test/card-reading apparatus generally is made up of motherboard and radio frequency card read head for ID and antenna, and the signal of radio-frequency field is directly produced by the radio frequency card read head for ID, and sends by the rf wave of AM modulation, and its depth of modulation is relevant with concrete radio frequency card read head for ID.The consensus standard that all are relevant with contactless IC card has stipulated clearly that all contactless IC card is fit to the depth of modulation scope of the AM waveform of work.Though different test/card-reading apparatus is all followed the protocol requirement of this respect, the depth of modulation scope of the AM modulating wave that different tests/card-reading apparatus produces still has certain difference.
In order to guarantee that contactless ic is stuck in the normal functions of use under the various application scenarios, need be stuck in contactless ic and test fully before dispatching from the factory, comprising the test of different radio frequency AM ripple depth of modulation.The radio frequency card read head for ID generally comprises modulation circuit and power amplification circuit, is finished the function of AM depth of convolution degree modulation by modulation circuit.The method of prior art is to change different radio frequency card read head for ID, to obtain the depth of modulation scope of AM waveform complete in the specialized range.The shortcoming that the method exists is, operation is comparatively complicated, and real-time is poor, and testing efficiency is low.
Summary of the invention
In order to overcome the shortcoming that exists in the above-mentioned prior art, the purpose of this invention is to provide a kind of modulation circuit that is used for non-contact IC card reading apparatus.It is used for the radio frequency card read head for ID of non-contact IC card reading apparatus, can in specialized range, regulates the degree of depth of radio frequency AM ripple continuously, and need not change the radio frequency card read head for ID, can guarantee that contactless ic is stuck in normal use the under the various application scenarios.Have characteristics easy to operate, that testing efficiency is high, real-time is good.
In order to reach above-mentioned goal of the invention, technical scheme of the present invention realizes as follows:
A kind of modulation circuit that is used for non-contact IC card reading apparatus, its design feature are that it comprises reference voltage unit and compensation modulating unit.Described reference voltage unit and compensation modulating unit are connected in series successively and power by input voltage.Described reference voltage unit comprises divider resistance, potentiometer and gate-controlled switch.Input voltage is connected with divider resistance, and the other end of divider resistance connects potentiometer and gate-controlled switch successively, the other end ground connection of gate-controlled switch.Described compensation modulating unit comprises current-limiting resistance, positive-negative-positive compensation triode and NPN type modulation triode.Input voltage is connected with the collector of current-limiting resistance with the modulation triode, and the other end of current-limiting resistance is connected with the emitter of compensation triode and the base stage of modulation triode.The grounded collector of compensation triode, divider resistance is connected with potentiometer in base stage and the reference voltage unit of compensation triode.The emitter output modulation voltage of modulation triode.The depth of modulation control signal is delivered to the variation that produces reference voltage in the reference voltage unit, and the compensation modulating unit compensates modulation back output modulation voltage.
In above-mentioned modulation circuit, described potentiometer can be digital regulation resistance or simulation potentiometer.
In above-mentioned modulation circuit, described gate-controlled switch can be the combined switch of digital switch, analog switch or other type.
Modulation circuit of the present invention is owing to adopted above-mentioned element and annexation thereof, only adopt the components and parts of only a few just to realize AM depth of modulation adjustable continuously of non-contact IC card reading apparatus easily, for power amplification circuit provides continually varying AM modulation set electrode voltage, thereby realize noncontact class IC-card is carried out test under the different radio frequency AM ripple depth of modulation.Compare the characteristics that the present invention has is easy to operate, testing efficiency is high, real-time is good with prior art.
The present invention will be further described below in conjunction with the drawings and specific embodiments.
Description of drawings
Fig. 1 is a fundamental diagram of the present invention;
Fig. 2 is a circuit structure diagram of the present invention;
Fig. 3 is an application principle synoptic diagram of the present invention.
Embodiment
Referring to Fig. 1 and Fig. 2, the present invention includes reference voltage unit 1 and compensation modulating unit 2.Reference voltage unit 1 and compensation modulating unit 2 are connected in series successively and power by input voltage vin.The depth of modulation control signal is delivered to the variation that produces reference voltage in the reference voltage unit 1.Compensation modulating unit 2 compensates modulation back output modulation voltage Vout, passes to power amplification circuit.Wherein reference voltage unit 1 comprises divider resistance r1, adopts digital regulation resistance or simulates the potentiometer R of potentiometer and adopt the gate-controlled switch MOD of the combined switch of digital switch, analog switch or other type.Input voltage vin is connected with divider resistance r1, and the other end of divider resistance r1 connects potentiometer R and gate-controlled switch MOD successively, the other end ground connection of gate-controlled switch MOD.The output resistance of depth of modulation control signal CONTROLLED POTENTIAL device R.Compensation modulating unit 2 comprises current-limiting resistance r2, positive-negative-positive compensation triode Q1 and NPN type modulation triode Q2.Input voltage vin is connected with the collector of modulation triode Q2 with current-limiting resistance r2, and the other end of current-limiting resistance r2 is connected with the emitter of compensation triode Q1 and the base stage of modulation triode Q2.Divider resistance r1 is connected with potentiometer R in the grounded collector of compensation triode Q1, the base stage of compensation triode Q1 and reference voltage unit 1.The emitter output modulation voltage Vout of modulation triode Q2 is to the power amplification loop.
Depth modulation computing method of the present invention are:
When gate-controlled switch MOD disconnected, the voltage VA of the intersection point A of divider resistance r1 and potentiometer R was an input voltage vin, and the voltage VB of the intersection points B of current-limiting resistance r2 and compensation triode Q1 is slightly smaller than input voltage vin.Voltage VA is greater than voltage VB, and compensation triode Q1 ends.This moment, the value V1 of modulation voltage Vout only depended on input voltage vin, current-limiting resistance r2 and modulation triode Q2, was approximately V1=Vin-Vbe, and Vbe is the cut-in voltage of triode.
When gate-controlled switch MOD is closed, the voltage VA of the intersection point A of divider resistance r1 and potentiometer R is by divider resistance r1 and the decision of potentiometer R dividing potential drop, VA=Vin*r1/ (r1+R), the value of potentiometer R changes with the control of depth of modulation control signal, thereby can obtain different voltage reference output VA.Voltage VA compensates triode Q1 conducting less than voltage VB.The result of compensation triode Q1 conducting makes VB=VA+Vbe.This moment, the value V2 of Vout was approximately V2=VB-Vbe=VA=Vin*r1/ (r1+R).
The computing formula of AM depth of modulation is (V1-V2)/(V1+V2).But the resistance of depth of modulation control signal real time altering potentiometer R, the gear of potentiometer R is abundant, and the voltage VA that exports from its middle tap is approximately continuous variation.Output voltage V 2 also changes according to depth of modulation control signal approximate continuity, i.e. also approximate continuity variation within the specific limits of AM depth of modulation.
Referring to Fig. 3, modulation circuit of the present invention is applied in the radio frequency card read head for ID of non-contact IC card reading apparatus.The DC voltage of modulation circuit output is added in the power amplification circuit and sends out prescribed depth scope, continually varying AM rf wave for the AM modulation.This part is prior art, does not do unnecessary giving unnecessary details.
Claims (3)
1, a kind of modulation circuit that is used for non-contact IC card reading apparatus, it is characterized in that, it comprises reference voltage unit (1) and compensation modulating unit (2), described reference voltage unit (1) and compensation modulating unit (2) are connected in series successively and power by input voltage (Vin), described reference voltage unit (1) comprises divider resistance (r1), potentiometer (R) and gate-controlled switch (MOD), input voltage (Vin) is connected with divider resistance (r1), the other end of divider resistance (r1) connects potentiometer (R) and gate-controlled switch (MOD) successively, the other end ground connection of gate-controlled switch (MOD), described compensation modulating unit (2) comprises current-limiting resistance (r2), positive-negative-positive compensation triode (Q1) and NPN type modulation triode (Q2), input voltage (Vin) is connected with the collector of current-limiting resistance (r2) with modulation triode (Q2), the other end of current-limiting resistance (r2) is connected with the emitter of compensation triode (Q1) and the base stage of modulation triode (Q2), the grounded collector of compensation triode (Q1), the base stage of compensation triode (Q1) is connected with potentiometer (R) with the middle divider resistance (r1) of reference voltage unit (1), the emitter output modulation voltage (Vout) of modulation triode (Q2), the depth of modulation control signal is delivered to the variation that reference voltage unit (1) produces reference voltage, and compensation modulating unit (2) compensates modulation back output modulation voltage (Vout).
2, the modulation circuit that is used for non-contact IC card reading apparatus according to claim 1 is characterized in that, described potentiometer (R) can be digital regulation resistance or simulation potentiometer.
3, the modulation circuit that is used for non-contact IC card reading apparatus according to claim 1 is characterized in that, described gate-controlled switch (MOD) can be the combined switch of digital switch, analog switch or other type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100087858A CN100349170C (en) | 2005-03-01 | 2005-03-01 | Modulation circuit for non-contact IC card reading apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100087858A CN100349170C (en) | 2005-03-01 | 2005-03-01 | Modulation circuit for non-contact IC card reading apparatus |
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| Publication Number | Publication Date |
|---|---|
| CN1828628A CN1828628A (en) | 2006-09-06 |
| CN100349170C true CN100349170C (en) | 2007-11-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2005100087858A Active CN100349170C (en) | 2005-03-01 | 2005-03-01 | Modulation circuit for non-contact IC card reading apparatus |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112686068A (en) * | 2020-12-31 | 2021-04-20 | 苏州赛动联付智能科技有限公司 | Non-card-connection sensitivity enhancing circuit and method for POS machine |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104899623B (en) * | 2015-05-29 | 2017-09-29 | 福建联迪商用设备有限公司 | A kind of method, system and the equipment of control Non-contact Media Reader modulation depth |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2076667U (en) * | 1990-10-15 | 1991-05-08 | 大华仪表厂 | Recording instrument for blended data |
| CN2219489Y (en) * | 1994-12-31 | 1996-02-07 | 姚贞香 | IC card gas metering controller |
| US5666036A (en) * | 1995-05-31 | 1997-09-09 | Sgs-Thomson Microelectronics, Inc. | Circuit for driving the motor of a temperature blend door |
| US6091887A (en) * | 1995-12-04 | 2000-07-18 | Papst-Motoren Gmbh & Co. Kg | Method and apparatus for controlling a physical parameter |
| CN2783429Y (en) * | 2005-03-01 | 2006-05-24 | 北京清华同方微电子有限公司 | Modulation circuit for contactless IC card read apparatus |
-
2005
- 2005-03-01 CN CNB2005100087858A patent/CN100349170C/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2076667U (en) * | 1990-10-15 | 1991-05-08 | 大华仪表厂 | Recording instrument for blended data |
| CN2219489Y (en) * | 1994-12-31 | 1996-02-07 | 姚贞香 | IC card gas metering controller |
| US5666036A (en) * | 1995-05-31 | 1997-09-09 | Sgs-Thomson Microelectronics, Inc. | Circuit for driving the motor of a temperature blend door |
| US6091887A (en) * | 1995-12-04 | 2000-07-18 | Papst-Motoren Gmbh & Co. Kg | Method and apparatus for controlling a physical parameter |
| CN2783429Y (en) * | 2005-03-01 | 2006-05-24 | 北京清华同方微电子有限公司 | Modulation circuit for contactless IC card read apparatus |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112686068A (en) * | 2020-12-31 | 2021-04-20 | 苏州赛动联付智能科技有限公司 | Non-card-connection sensitivity enhancing circuit and method for POS machine |
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| CN1828628A (en) | 2006-09-06 |
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Address after: 100083 Beijing City, Haidian District Wudaokou Wangzhuang Road No. 1 Tongfang Technology Plaza D floor 18 West Patentee after: Beijing Tongfang Microelectronics Company Address before: 100083 A, block 2901, Tongfang science and Technology Plaza, Beijing Patentee before: Beijing Tongfang Microelectronics Company |