CN203179516U - Magnetic head magnetic writing circuit utilizing direct-current bias technology - Google Patents
Magnetic head magnetic writing circuit utilizing direct-current bias technology Download PDFInfo
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- CN203179516U CN203179516U CN 201320158210 CN201320158210U CN203179516U CN 203179516 U CN203179516 U CN 203179516U CN 201320158210 CN201320158210 CN 201320158210 CN 201320158210 U CN201320158210 U CN 201320158210U CN 203179516 U CN203179516 U CN 203179516U
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- constant current
- current source
- magnetic
- effect transistor
- field effect
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Abstract
The utility model discloses a magnetic head magnetic writing circuit utilizing a direct-current bias technology. The circuit comprises a first constant current source VCC1, a second constant current source VCC2, a read/write magnetic head L1, an operational amplifier U1A, a field effect transistor Q1, and a resistor R1. The circuit is characterized in that the first constant current source VCC1 is connected with a drain of the field effect transistor Q1 through connecting the read/write magnetic head L1; a gate of the field effect transistor Q1 is connected to the output terminal of the operational amplifier U1A; a source of the field effect transistor Q1 is connected to the resistor R1; the operational amplifier U1A is connected to the second constant current source VCC2, an inverting input terminal is connected with the resistor R1, and a non-inverting input terminal inputs 1V. According to the circuit, a constant current source is added, such that writing signals are accumulated onto the constant current source, and a problem of high voltage requirement of the writing of high-resistance magnetic card is solved.
Description
Technical field:
The utility model relates to magnetic card magnetic head circuit, and particularly a kind of magnetic head of DC magnetic biasing technology that utilizes is write magnetic circuit.
Background technology:
As everyone knows, at present magnetic card being carried out write operation is to realize magnetizing tape by the high voltage that adds variation at the magnetic head two ends, to be implemented in the purpose of magnetic card identifying recording layer.This technical requirement voltage is higher, and along with the wearing and tearing of magnetic head, the writing the magnetic function and can be affected of magnetic card, thus influence the normal read-write of magnetic card.
The utility model content:
In view of above-mentioned technical matters, the utility model provides a kind of magnetic head of DC magnetic biasing technology that utilizes to write magnetic circuit.This circuit makes write signal be added on this constant current source by increasing by a constant current source, thereby solves the high diamagnetic calorie requirement high voltage problem of writing.
Concrete technical scheme of the present utility model is as follows:
Utilize the magnetic head of DC magnetic biasing technology to write magnetic circuit, comprise the first constant current source VCC1, the second constant current source VCC2, read-write head L1, operational amplifier U1A, field effect transistor Q1 and impedance R1; It is characterized in that the described first constant current source VCC1 is by connecting the drain electrode that read-write head L1 inserts field effect transistor Q1; The output terminal of the grid concatenation operation amplifier U1A of field effect transistor Q1; The source electrode of field effect transistor Q1 connects impedance R1; Described operational amplifier U1A connects the second constant current source VCC2, and inverting input connects impedance R1, in-phase input end input 1V.
In the such scheme, the described first constant current source VCC1 and the second constant current source VCC2 adopt the constant current source of 150mA.
The beneficial effect of circuit described in the utility model is:
1, solves the high diamagnetic calorie requirement high voltage problem of writing.
2, when writing magnetic card, add a constant current source at magnetic head, write signal is added on this constant current source.
3, the circuit of this scheme and primary voltage type relatively, the supply voltage when writing high diamagnetic card is by the near 5V of 12V.
Description of drawings:
Further specify the utility model below in conjunction with the drawings and specific embodiments.
Fig. 1 is circuit structure diagram described in the utility model.
Fig. 2 is the coordinate synoptic diagram that the magnetic head magnetic flux of DC magnetic biasing is arranged.
Fig. 3 is the coordinate synoptic diagram of the magnetic head magnetic flux of non DC bias.
Embodiment:
For technological means, creation characteristic that the utility model is realized, reach purpose and effect is easy to understand, below in conjunction with concrete diagram, further set forth the utility model.
As shown in Figure 1, the magnetic head of DC magnetic biasing technology that utilizes described in the utility model is write magnetic circuit, and it comprises the first constant current source VCC1, the second constant current source VCC2, read-write head L1 and adopts TCL064CD here by operational amplifier U1A(), to adopt model here be the N channel field-effect pipe MOSFET of NTA4153NT1G to field effect transistor Q1() and the write signal controller formed of impedance R1.
Wherein, the first constant current source VCC1 is by connecting the drain electrode that read-write head L1 inserts field effect transistor Q1; The output terminal of the grid concatenation operation amplifier U1A of field effect transistor Q1; The source electrode of field effect transistor Q1 connects impedance R1; Operational amplifier U1A connects the second constant current source VCC2, and inverting input connects impedance R1, in-phase input end input 1V.
It is pointed out that the first constant current source VCC1 in the circuit and the second constant current source VCC2 adopt the constant current source of 150mA.
The structure of above-mentioned circuit described in the utility model utilizes the magnetic card magnetic head when the magnetization magnetic medium, adds certain magnetic field, can strengthen the principle of magnetization effect.So in entire circuit, by adding a quantitative constant current source, to improve the magnetization effect of magnetic head, make it under less voltage, can write high diamagnetic.Referring to Fig. 2 and Fig. 3, Φ represents the magnetic flux by magnetic head among the figure, and t represents charge time.These two figure have shown under the situation of non DC bias the situation of change of magnetic flux on the magnetic head.
After facts have proved employing the utility model circuit, having under the situation of DC magnetic biasing, changing under the very little situation at write signal, can produce very big magnetic flux.Under the situation of 5V power supply, can write high diamagnetic card like this.
More than show and described ultimate principle of the present utility model and principal character and advantage of the present utility model.The technician of the industry should understand; the utility model is not restricted to the described embodiments; that describes in above-described embodiment and the instructions just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (2)
1. utilize the magnetic head of DC magnetic biasing technology to write magnetic circuit, comprise the first constant current source VCC1, the second constant current source VCC2, read-write head L1, operational amplifier U1A, field effect transistor Q1 and impedance R1; It is characterized in that the described first constant current source VCC1 is by connecting the drain electrode that read-write head L1 inserts field effect transistor Q1; The output terminal of the grid concatenation operation amplifier U1A of field effect transistor Q1; The source electrode of field effect transistor Q1 connects impedance R1; Described operational amplifier U1A connects the second constant current source VCC2, and inverting input connects impedance R1, in-phase input end input 1V.
2. write magnetic circuit according to the magnetic head that utilizes the DC magnetic biasing technology of claim 1, it is characterized in that, the described first constant current source VCC1 and the second constant current source VCC2 adopt the constant current source of 150mA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320158210 CN203179516U (en) | 2013-04-01 | 2013-04-01 | Magnetic head magnetic writing circuit utilizing direct-current bias technology |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320158210 CN203179516U (en) | 2013-04-01 | 2013-04-01 | Magnetic head magnetic writing circuit utilizing direct-current bias technology |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203179516U true CN203179516U (en) | 2013-09-04 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320158210 Expired - Fee Related CN203179516U (en) | 2013-04-01 | 2013-04-01 | Magnetic head magnetic writing circuit utilizing direct-current bias technology |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203179516U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052317A (en) * | 2014-07-03 | 2014-09-17 | 郑州日产汽车有限公司 | Voltage simulator of battery of electric vehicle |
-
2013
- 2013-04-01 CN CN 201320158210 patent/CN203179516U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104052317A (en) * | 2014-07-03 | 2014-09-17 | 郑州日产汽车有限公司 | Voltage simulator of battery of electric vehicle |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130904 Termination date: 20170401 |