CN215984585U - Output signal anti-interference circuit based on MT6825 magnetic encoder - Google Patents
Output signal anti-interference circuit based on MT6825 magnetic encoder Download PDFInfo
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- CN215984585U CN215984585U CN202122516541.8U CN202122516541U CN215984585U CN 215984585 U CN215984585 U CN 215984585U CN 202122516541 U CN202122516541 U CN 202122516541U CN 215984585 U CN215984585 U CN 215984585U
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Abstract
The utility model belongs to the technical field of magnetic encoders, and particularly relates to an output signal anti-interference circuit based on an MT6825 magnetic encoder. Three paths of output signals converted by the MT6825 magnetic encoder are respectively connected to a pin seven, a pin one and a pin fifteen of the differential driving chip I; converting the input signal into three paths of input differential signals through a first differential driving chip; three paths of pulse signals of the self magnetic resistance of the MT6825 magnetic encoder are respectively connected to a seventh pin, a first pin and a fifteenth pin of the second differential driving chip, and the pulse signals are converted into three paths of pulse differential signals through the second differential driving chip; in addition, the three input differential signals and the three pulse differential signals are respectively and correspondingly connected to the first anti-static suppression chip, the second anti-static suppression chip and the third anti-static suppression chip to perform static elimination so as to reduce the interference of output signals. The differential processing and static suppression are carried out on the output signals of the magnetic encoder, and the interference in the output signals is greatly reduced.
Description
Technical Field
The utility model belongs to the technical field of magnetic encoders, and particularly relates to an output signal anti-interference circuit based on an MT6825 magnetic encoder.
Background
In order to ensure the simplicity and tidiness of a designed circuit, many motor factories select AK7452 as a magnetic encoding chip to carry out angle conversion, and change of a magnetic field is converted into an electric signal through an internal algorithm of the chip to be output to a single chip microcomputer, but the magnetic encoding AK7452 is a product of Japan AKM company, is easy to get out of stock and is expensive.
Compared with a domestic magnetic encoder chip, the price of the anti-interference circuit is cheaper than that of an imported chip, certain shrinkage exists in corresponding performance, the anti-interference performance of the MT6825 to the outside is much weaker than that of AK7452, and pulse signals output by the MT6825 have a lot of burrs under the same driving circuit, so that the anti-interference circuit based on the output signals of the MT6825 magnetic encoder is provided.
Disclosure of Invention
Aiming at solving the problems of the defects and the shortcomings of the prior art; the utility model aims to provide an anti-interference circuit based on an output signal of an MT6825 magnetic encoder, which has the advantages of simple structure, reasonable design and convenient use, and can carry out differential processing and electrostatic suppression on the output signal of the magnetic encoder, thereby greatly reducing the interference in the output signal; the problem of short plates of the existing domestic magnetic encoder is solved with low cost, so that the multi-occasion requirements of the motor are met.
In order to achieve the purpose, the utility model adopts the technical scheme that: the differential drive circuit comprises a differential drive chip I, a differential drive chip II, an anti-static suppression chip I, an anti-static suppression chip II and an anti-static suppression chip III; three paths of output signals converted by the MT6825 magnetic encoder are respectively connected to a pin seven, a pin one and a pin fifteen of the differential driving chip I; converting the input signal into three paths of input differential signals through a first differential driving chip; the three pulse signals A, B, Z of the self magnetic resistance of the MT6825 magnetic encoder are respectively connected to a pin seven, a pin one and a pin fifteen of the differential driving chip two, and the pulse signals are converted into three pulse differential signals through the differential driving chip two; in addition, the three input differential signals and the three pulse differential signals are respectively and correspondingly connected to the first anti-static suppression chip, the second anti-static suppression chip and the third anti-static suppression chip to perform static elimination so as to reduce the interference of output signals.
Furthermore, the power supply terminals of the differential driving chip I, the differential driving chip II, the anti-static suppression chip I, the anti-static suppression chip II and the anti-static suppression chip are all connected with a power supply circuit which is subjected to filtering processing.
Furthermore, a 1KV 1NF capacitor is connected in series between the power supply circuit and the ground terminal of the MT6825 magnetic encoder.
Further, the differential driving chip I and the differential driving chip II are preferably 26LS31 differential driving chips.
Furthermore, the first anti-static suppression chip, the second anti-static suppression chip and the third anti-static suppression chip are preferably three groups of IP4220CZ6 static suppression chips with the same quality.
After adopting the structure, the utility model has the beneficial effects that: the differential processing and static suppression are carried out on the output signal of the magnetic encoder, so that the interference in the output signal is greatly reduced; the short plate problem of the existing domestic magnetic encoder is solved with low cost, the performance of a small part can be sacrificed, and the equipment cost is greatly reduced so as to meet the multi-occasion requirements of the motor.
Drawings
To more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention is described in detail by the following specific embodiments and the accompanying drawings.
FIG. 1 is a schematic diagram of a differential signal conversion circuit according to the present invention;
fig. 2 is a schematic diagram of a power supply circuit E according to the present invention.
Detailed Description
In order that the objects, aspects and advantages of the utility model will become more apparent, the utility model will be described by way of example only, and in connection with the accompanying drawings. It is to be understood that such description is merely illustrative and not intended to limit the scope of the present invention. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present invention.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the scheme according to the present invention are shown in the drawings, and other details not so relevant to the present invention are omitted.
Referring to fig. 1 and 2, the following technical solutions are adopted in the present embodiment: the differential drive circuit comprises a differential drive chip I U2, a differential drive chip II U3, an anti-static suppression chip I U4, an anti-static suppression chip II U5 and an anti-static suppression chip III U6; three paths of output signals U, V, W converted by the MT6825 magnetic encoder are respectively connected to a pin seven, a pin one and a pin fifteen of a first differential driver chip U2; converting the input signal into three paths of input differential signals +/-U, +/-V and +/-W through a first differential driver chip U2; three pulse signals A, B, Z of self magnetic resistance of the MT6825 magnetic encoder are respectively connected to a seventh pin, a first pin and a fifteenth pin of a second U3 of the differential drive chip, and the pulse signals are converted into three pulse differential signals +/-A, +/-B and +/-Z through the second U3 of the differential drive chip; in addition, the three input differential signals +/-U, +/-V, +/-W and the three pulse differential signals +/-A, +/-B and +/-Z are respectively and correspondingly connected to the first anti-static suppression chip U4, the second anti-static suppression chip U5 and the third anti-static suppression chip U6 for static elimination to reduce the interference of output signals.
The power supply terminals of the first differential driving chip U2, the second differential driving chip U3, the first anti-static suppression chip U4, the second anti-static suppression chip U5 and the third anti-static suppression chip U6 are all connected with a power supply circuit E which is subjected to filtering processing; a 1KV 1NF capacitor C20 is connected in series between the power supply circuit E and the ground terminal of the MT6825 magnetic encoder; the differential driving chip I U2 and the differential driving chip II U3 are preferably 26LS31 differential driving chips; the first anti-static suppression chip U4, the second anti-static suppression chip U5 and the third anti-static suppression chip U6 are preferably three groups of IP4220CZ6 static suppression chips with the same quality.
The working principle of the specific embodiment is as follows: firstly, selecting a shielded twisted-pair line on the selection of encoding lines, and applying the shielding lines to a ground wire connected to a servo driver and a grounding end of a magnetic encoder PCB (printed circuit board), and then connecting a 1KV 1NF capacitor in series on a signal ground and a ground of the board to form equipotential interference reduction; then, connecting the output signal converted by the magnetic encoder PCB and the reluctance pulse signal to a differential driving chip for differential output, and ensuring that the power supply voltage of the differential driving chip cannot be lower than the minimum working voltage, otherwise, the differential output signal is input slightly; meanwhile, the anti-static suppression chip is used for carrying out static elimination treatment on the differential output; in addition, the chip power circuit also needs to be subjected to safety protection and filtering treatment.
After adopting the structure, the utility model has the beneficial effects that: the differential processing and static suppression are carried out on the output signal of the magnetic encoder, so that the interference in the output signal is greatly reduced; the short plate problem of the existing domestic magnetic encoder is solved with low cost, the performance of a small part can be sacrificed, and the equipment cost is greatly reduced so as to meet the multi-occasion requirements of the motor.
It will be evident to those skilled in the art that the utility model is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the utility model being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.
Claims (5)
1. Based on MT6825 magnetic encoder output signal anti jamming circuit, its characterized in that: the differential drive circuit comprises a first differential drive chip (U2), a second differential drive chip (U3), a first anti-static suppression chip (U4), a second anti-static suppression chip (U5) and a third anti-static suppression chip (U6); three paths of output signals (U), (V) and (W) converted by the MT6825 magnetic encoder are respectively connected to a pin seven, a pin one and a pin fifteen of a differential driving chip I (U2); converting the input signal into three paths of input differential signals (plus or minus U), (plus or minus V) and (plus or minus W) through a differential driving chip I (U2); the three pulse signals A, B, Z of the self magnetic resistance of the MT6825 magnetic encoder are respectively connected to a pin seven, a pin one and a pin fifteen of a differential driving chip two (U3), and the pulse signals are converted into three pulse differential signals (+/-A), (+/-B) and (+/-Z) through the differential driving chip two (U3); in addition, the three input differential signals (+ -U), (+ -V), (+ -W) and the three pulse differential signals (+ -A), (+ -B) and (+ -Z) are respectively and correspondingly connected to the first anti-static suppression chip (U4), the second anti-static suppression chip (U5) and the third anti-static suppression chip (U6) to perform static elimination and reduce the interference of output signals.
2. The MT6825 magnetic encoder based output signal immunity circuit of claim 1, wherein: and power supply terminals of the differential driving chip I (U2), the differential driving chip II (U3), the anti-static suppression chip I (U4), the anti-static suppression chip II (U5) and the anti-static suppression chip III (U6) are all connected with the power supply circuit (E) which is subjected to filtering processing.
3. The MT6825 magnetic encoder based output signal immunity circuit of claim 2, wherein: and a 1KV 1NF capacitor (C20) is connected in series between the power supply circuit (E) and the ground terminal of the MT6825 magnetic encoder.
4. The MT6825 magnetic encoder based output signal immunity circuit of claim 1, wherein: the first differential driving chip (U2) and the second differential driving chip (U3) are preferably 26LS31 differential driving chips.
5. The MT6825 magnetic encoder based output signal immunity circuit of claim 1, wherein: the three groups of IP4220CZ6 static suppression chips with the same quality are preferably selected from the static suppression chip I (U4), the static suppression chip II (U5) and the static suppression chip III (U6).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122516541.8U CN215984585U (en) | 2021-10-19 | 2021-10-19 | Output signal anti-interference circuit based on MT6825 magnetic encoder |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122516541.8U CN215984585U (en) | 2021-10-19 | 2021-10-19 | Output signal anti-interference circuit based on MT6825 magnetic encoder |
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| CN215984585U true CN215984585U (en) | 2022-03-08 |
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| CN202122516541.8U Active CN215984585U (en) | 2021-10-19 | 2021-10-19 | Output signal anti-interference circuit based on MT6825 magnetic encoder |
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