CN206877335U - A kind of circuit structure of magnetic card Card Reader - Google Patents
A kind of circuit structure of magnetic card Card Reader Download PDFInfo
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- CN206877335U CN206877335U CN201720297890.6U CN201720297890U CN206877335U CN 206877335 U CN206877335 U CN 206877335U CN 201720297890 U CN201720297890 U CN 201720297890U CN 206877335 U CN206877335 U CN 206877335U
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Abstract
The utility model discloses a kind of circuit structure of magnetic card Card Reader, including MSP430 single-chip microcomputers and induction coil, the MSP430 single-chip microcomputers are connected with LC frequency-selecting power amplification circuits, the LC frequency-selectings power amplification circuit connects induction coil, the induction coil is connected with envelope detection circuit, and the envelope detection circuit connects MSP430 single-chip microcomputers by waveform shaping circuit；The MSP430 single-chip microcomputers interrupt the square wave of control I/O generation 125klHz frequencies using the timer T0 of itself, the square wave is sent into the I/O mouths of MSP430 single-chip microcomputers by LC frequency-selectings power amplification circuit, envelope detection circuit and waveform shaping circuit successively, the card reading circuit stable and reliable working performance, it can correctly identify, read radio frequency card inside information, and device cost is low.
Description
Technical field
Magnetic card card reading circuit technical field is the utility model is related to, specially a kind of circuit structure of magnetic card Card Reader.
Background technology
During existing magnetic card Card Reader, it is amplified and is shaped to by the weak triangular signal of reading head two magnetic tracks of reading
F2F square-wave signals.During this, the usual way of amplification, the shaping of magnetic card Card Reader signal is that stamping the card for reading 20-30mV is weak
Triangular signal, two stage amplifer is first passed through, then realized by a hysteresis loop comparator.In general magnetic card card reading circuit,
125kHz frequencies are divided to obtain by frequency divider to crystal oscillator, meanwhile, Card Reader process also needs to carry using a voltage follower
Supply reference voltage, 4 discharge circuits is must be provided with such circuit, moreover, peripheral circuit is also sufficiently complex, so existing magnetic
Card card reading circuit is complicated, and cost is high.
Utility model content
To achieve the above object, the utility model provides following technical scheme：A kind of circuit structure of magnetic card Card Reader,
Including MSP430 single-chip microcomputers and induction coil, the MSP430 single-chip microcomputers are connected with LC frequency-selecting power amplification circuits, the LC choosings
Frequency power amplification circuit connects induction coil, and the induction coil is connected with envelope detection circuit, and the envelope detection circuit leads to
Cross waveform shaping circuit connection MSP430 single-chip microcomputers；The MSP430 single-chip microcomputers interrupt control I/O using the timer T0 of itself
The square wave of 125klHz frequencies is produced, the square wave passes through LC frequency-selectings power amplification circuit, envelope detection circuit and waveform shaping successively
Circuit is sent into the I/O mouths of MSP430 single-chip microcomputers.
As a kind of preferable technical scheme of the utility model, the LC frequency-selectings power amplification circuit output is followed by LC series connection
Resonance circuit, when loop natural resonance frequency is equal with frequency input signal, series resonance occurs for circuit.
As a kind of preferable technical scheme of the utility model, the waveform shaping circuit is internally integrated two using LM358
Individual amplifier can obtain good square-wave signal after shaping twice.
Compared with prior art, the beneficial effects of the utility model are：This is new directly to be determined using MSP430 single-chip microcomputers
When device T0 interrupt control I/O and produce 125klHz square wave, and pass through reading after signal is amplified by LC frequency-selecting power amplification circuits
The induction coil of card circuit produces a magnetic field with certain energy, and radio-frequency card is close to after coil power-up initializing, just successively
Data message is exported repeatedly, untill card leaves coil losing electricity, magnetic card passes through magnetic field shadow using the induction coil of itself
The induction coil in card reading circuit is rung, amplitude-modulated signal caused by induction coil is after envelope detection circuit, by 125kHz load
Ripple target signal filter, sine wave signal is obtained, then sine wave is converted into the square-wave signal of wave-like flat by waveform shaping circuit,
And it is sent into MSP430 single-chip microcomputers and is handled；The card reading circuit stable and reliable working performance, can correctly identify, read radio-frequency card
Interior information, and device cost is low, in theory, can not only realize the read functions to magnetic card, and can pass through timer
The generation of T0 TR0 control 125kHz frequency square waves, the mode for changing induction coil magnetic field encode to read-write magnetic card,
Card function is write in realization.
Brief description of the drawings
Fig. 1 is the utility model structure diagram；
Fig. 2 is the utility model circuit diagram；
Fig. 3 is LC series resonant circuit figures in the utility model embodiment.
In figure：1-MSP430 single-chip microcomputers；2-LC frequency-selecting power amplification circuits；3- induction coils；4- envelope detection circuits；5-
Waveform shaping circuit.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, the technical scheme in the embodiment of the utility model is carried out
Clearly and completely describing, it is clear that described embodiment is only the utility model part of the embodiment, rather than whole
Embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not under the premise of creative work is made
The every other embodiment obtained, belong to the scope of the utility model protection.
Embodiment：
Fig. 1 and Fig. 2 are referred to, the utility model provides a kind of technical scheme：A kind of circuit structure of magnetic card Card Reader,
Including MSP430 single-chip microcomputers 1 and induction coil 3, the MSP430 single-chip microcomputers 1 are connected with LC frequency-selectings power amplification circuit 2, described
LC frequency-selectings power amplification circuit 2 connects induction coil 3, and the induction coil 3 is connected with envelope detection circuit 4, the envelope inspection
Wave circuit 4 connects MSP430 single-chip microcomputers 1 by waveform shaping circuit 5；The MSP430 single-chip microcomputers 1 utilize the timer T0 of itself
The square wave that control I/O produces 125klHz frequencies is interrupted, the square wave is successively by LC frequency-selectings power amplification circuit 2, envelope detection electricity
Road 4 and waveform shaping circuit 5 are sent into the I/O mouths of MSP430 single-chip microcomputers 1.
The LC frequency-selectings power amplification circuit 2 output is followed by LC series resonant circuits, when loop natural resonance frequency with it is defeated
Enter signal frequency it is equal when, circuit occur series resonance.
As shown in figure 3, the LC series resonant circuits are sequentially connected in series and formed by coil L, resistance r and electric capacity C, online
Making alive V between circle L and electric capacity Ci.It is mainly characterized by with frequency-selecting effect.
As depicted in figs. 1 and 2, the envelope detection circuit 4 is filled using diode unilateal conduction characteristic and detection load RC
Discharge process realizes that induction coil L1 produces resonance potential and there are about 20V, so the voltage of carrier signal is also about 20V.To input
Voltage is higher than 500mV detections, is referred to as " big signal demodulator ".
The waveform shaping circuit 5 becomes the signal after detection the low and high level that single-chip microcomputer can identify, using LM358
Good square-wave signal can be obtained after shaping twice by being internally integrated two amplifiers, and R17, R18 play partial pressure work in circuit
With it is 2.5V to determine output switching activity thresholding；R13 is by the voltage superposition inputted in the same direction in reverse input end；C6, C8 are coupling electricity
Hold, can isolated DC component, transmit AC signal.Work as U+During more than U ± 2.5V, high level is exported；Work as U+Less than U ± 2.5V
When, export low level.
New directly interrupted using the timer T0 of MSP430 single-chip microcomputers controls I/O to produce 125klHz square wave, and leads to
Cross after LC frequency-selecting power amplification circuits amplify signal has certain energy by the induction coil generation one of card reading circuit
Magnetic field, radio-frequency card just successively export data message close to after coil power-up initializing repeatedly, until card leaves coil losing electricity
Untill, magnetic card influences the induction coil in card reading circuit using the induction coil of itself by magnetic field, is adjusted caused by induction coil
Width signal filters out 125kHz carrier signal after envelope detection circuit, obtains sine wave signal, then pass through waveform shaping
Sine wave is converted into the square-wave signal of wave-like flat by circuit, and is sent into MSP430 single-chip microcomputers and is handled；The card reading circuit work
Make stable and reliable for performance, can correctly identify, read radio frequency card inside information, and device cost is low, in theory, not only can be real
Now to the read functions of magnetic card, and the generation of 125kHz frequency square waves can be controlled by timer T0 TR0, change sensing
The mode of coil magnetic field encodes to read-write magnetic card, and card function is write in realization.
It is obvious to a person skilled in the art that the utility model is not limited to the details of above-mentioned one exemplary embodiment, and
And in the case of without departing substantially from spirit or essential attributes of the present utility model, it can realize that this practicality is new in other specific forms
Type.Therefore, no matter from the point of view of which point, embodiment all should be regarded as exemplary, and is nonrestrictive, this practicality is new
The scope of type limits by appended claims rather than described above, it is intended that the equivalency fallen in claim is contained
All changes in justice and scope are included in the utility model.Any reference in claim should not be considered as limitation
Involved claim.
Claims (3)
- A kind of 1. circuit structure of magnetic card Card Reader, it is characterised in that：Including MSP430 single-chip microcomputers（1）And induction coil（3）, The MSP430 single-chip microcomputers（1）It is connected with LC frequency-selecting power amplification circuits（2）, the LC frequency-selectings power amplification circuit（2）Connection Induction coil（3）, the induction coil（3）It is connected with envelope detection circuit（4）, the envelope detection circuit（4）Pass through waveform Shaping circuit（5）Connect MSP430 single-chip microcomputers（1）；The MSP430 single-chip microcomputers（1）Control is interrupted using the timer T0 of itself I/O produces the square wave of 125klHz frequencies, and the square wave passes through LC frequency-selecting power amplification circuits successively（2）, envelope detection circuit（4） And waveform shaping circuit（5）It is sent into MSP430 single-chip microcomputers（1）I/O mouths.
- A kind of 2. circuit structure of magnetic card Card Reader according to claim 1, it is characterised in that：The LC frequency-selectings power Amplifying circuit（2）Output is followed by LC series resonant circuits, when loop natural resonance frequency is equal with frequency input signal, circuit Generation series resonance.
- A kind of 3. circuit structure of magnetic card Card Reader according to claim 1, it is characterised in that：The waveform shaping electricity Road（5）Good square-wave signal can be obtained after shaping twice by being internally integrated two amplifiers using LM358.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720297890.6U CN206877335U (en) | 2017-03-25 | 2017-03-25 | A kind of circuit structure of magnetic card Card Reader |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720297890.6U CN206877335U (en) | 2017-03-25 | 2017-03-25 | A kind of circuit structure of magnetic card Card Reader |
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| Publication Number | Publication Date |
|---|---|
| CN206877335U true CN206877335U (en) | 2018-01-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720297890.6U Active CN206877335U (en) | 2017-03-25 | 2017-03-25 | A kind of circuit structure of magnetic card Card Reader |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113297862A (en) * | 2021-03-09 | 2021-08-24 | 苏州德仕耐五金技术有限公司 | Card reading device for identifying HID induction card |
-
2017
- 2017-03-25 CN CN201720297890.6U patent/CN206877335U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113297862A (en) * | 2021-03-09 | 2021-08-24 | 苏州德仕耐五金技术有限公司 | Card reading device for identifying HID induction card |
| CN113297862B (en) * | 2021-03-09 | 2022-10-18 | 苏州德仕耐五金技术有限公司 | Card reading device for identifying HID induction card |
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