CN205912030U - A isolated transmission circuit for encoder - Google Patents
A isolated transmission circuit for encoder Download PDFInfo
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- CN205912030U CN205912030U CN201620555978.9U CN201620555978U CN205912030U CN 205912030 U CN205912030 U CN 205912030U CN 201620555978 U CN201620555978 U CN 201620555978U CN 205912030 U CN205912030 U CN 205912030U
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- isolation
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Abstract
The utility model discloses an isolated transmission circuit for encoder, it includes power isolation unit and signal isolation unit, wherein: the power isolation unit is including the power isolation chip, two inputs of power isolation chip are used for inserting power supply voltage, two outputs of power isolation chip are used for connecting the power end of encoder, the signal isolation unit is including transformer and common mode inductance, the primary winding of transformer connects in parallel in the difference signal output part of encoder, the secondary of transformer connects in parallel in common mode inductance's input, by transformer and common mode inductance and keep apart the difference signal coupled of encoder to utilize common mode inductance's output to export the differential signal after keeping apart. The utility model discloses can not only overcome interference, the time delay of reduction signal transmission among the encoder signal transmission process, moreover simple structure, easy realization, low cost.
Description
Technical field
This utility model is related to signal circuit, more particularly, to a kind of isolation and transmission circuit for encoder.
Background technology
Encoder is a kind of sensor for detecting swing offset amount, by swing offset data conversion is become digital arteries and veins
Rush signal output.The encoder commonly used at present has incremental encoder and absolute type encoder, the wherein inspection of absolute type encoder
Survey precision higher, thus more apply in hi-Fix field.Because the data bits of absolute type encoder output is more,
According to the mode of parallel wiring, then must assure that every line all connects well, but under complicated and severe operating mode, seldom
Possess above-mentioned condition, therefore, generally by the way of serial differential transmission is with reference to shielded communication circuit, carry out signal transmission, in order to
Improve the capacity of resisting disturbance of circuit, generally signal isolation is realized using common optical coupler or high speed photo coupling, but both modes
Can bring following shortcoming:
1st, there is time delay it is impossible to the signal that detects of Real-time Feedback in common optoelectronic coupler, and circuit also can relatively be answered simultaneously
Miscellaneous.For needing real-time control, the occasion of high-precision requirement is difficult to apply, and destroys the condition of whole system stable operation；
If the 2 minimizing time delays that bring of common optoelectronic coupler and select high-speed photoelectric coupler, then relatively costly.
Utility model content
The technical problems to be solved in the utility model is, for the deficiencies in the prior art, provides one kind can overcome volume
Interference in code device signals transmission, reduce signal transmission time delay, structure is simple, be easily achieved, isolation with low cost passes
Transmission of electricity road.
For solving above-mentioned technical problem, this utility model adopts the following technical scheme that.
A kind of isolation and transmission circuit for encoder, it includes isolated from power unit and signal isolation unit, wherein: institute
State isolated from power unit and include isolated from power chip, two inputs of described isolated from power chip are used for accessing power supply electricity
Pressure, two outfans of described isolated from power chip are used for connecting the power end of encoder；Described signal isolation unit includes
Transformator and common mode inductance, the armature winding of described transformator is parallel to the differential signal outputs of encoder, described transformator
Secondary windings be parallel to the input of common mode inductance, the differential signal by encoder by described transformator and common mode inductance
Coupling isolation, and using the differential signal after the outfan output isolation of common mode inductance.
Preferably, described isolated from power unit also includes the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity and the 6th electric capacity,
Be connected between two inputs of isolated from power chip after described 3rd electric capacity and the parallel connection of the 4th electric capacity, described 5th electric capacity and
It is connected to after 6th electric capacity parallel connection between two outfans of isolated from power chip.
Preferably, described isolated from power unit also includes the first inductance and the second inductance, and described first inductance is series at
One of two inputs of isolated from power chip, described second inductance is series at one of two outfans of isolated from power chip.
Preferably, described signal isolation unit also includes first resistor and second resistance, and described first resistor is parallel to
The armature winding of transformator, described second resistance is parallel to the secondary windings of transformator.
Preferably, described signal isolation unit also includes the first electric capacity, the second electric capacity, the first diode and the two or two pole
Pipe, be connected to after described first electric capacity and the second capacitances in series between two outfans of common mode inductance, described first electric capacity and
The junction point ground connection of the second electric capacity, the anode of described first diode and the anode of the second diode are all grounded, and the described 1st
The negative electrode of the negative electrode of pole pipe and the second diode is connected to two outfans of common mode inductance.
In the disclosed isolation and transmission circuit for encoder of this utility model, using isolated from power chip by feeder ear
It is isolated with encoder, to avoid power supply ripple that encoder is interfered, in signal isolation unit, by the coupling of transformator
Cooperation is used, and effectively by the signal isolation of front and back end, recycles common mode inductance to filter the electromagnetic interference in two signal line, Jin Erti
The transmission precision of high code device signal, meanwhile, compared to existing technology in for optocoupler is carried out by the way of signal isolation, this reality
Greatly reduce signal transmission time delay with new it is ensured that the real-time Transmission of code device signal, additionally, this utility model is only adopted
Can be achieved with signal isolation with simple structure, it is not only easy to realize, and with low cost.
Brief description
Fig. 1 is the circuit diagram of spacing output circuit in this utility model first embodiment.
Fig. 2 is the circuit diagram of spacing output circuit in this utility model second embodiment.
Specific embodiment
With reference to the accompanying drawings and examples this utility model is described in more detail.
Embodiment 1
The present embodiment proposes a kind of isolation and transmission circuit for encoder, as shown in figure 1, it includes isolated from power list
Unit and signal isolation unit, wherein:
Described isolated from power unit includes isolated from power chip u1, two inputs of described isolated from power chip u1
(vcc, gnd) is used for accessing supply voltage, and two outfans (e_vcc, e_gnd) of described isolated from power chip u1 are used for connecting
The power end of encoder；
Described signal isolation unit includes transformator t1 and common mode inductance l1, and the armature winding of described transformator t1 is in parallel
In the differential signal outputs (d+, d-) of encoder, the secondary windings of described transformator t1 are parallel to the input of common mode inductance l1
The couple differential signals of encoder are isolated by end by described transformator t1 and common mode inductance l1, and utilize common mode inductance l1
Outfan (e_d+, e_d-) output isolation after differential signal.
In above-mentioned isolation and transmission circuit, using isolated from power chip u1, feeder ear is isolated with encoder, to avoid electricity
Source ripple interferes to encoder, in signal isolation unit, by the coupling of transformator t1, effectively by front and back end
Signal isolation, recycles common mode inductance l1 to filter the electromagnetic interference in two signal line, and then improves the transmission of code device signal
Precision, meanwhile, compared to existing technology in for optocoupler is carried out by the way of signal isolation, this utility model greatly reduces letter
Number transmission delay it is ensured that the real-time Transmission of code device signal, additionally, this utility model can be achieved with only with simple structure
Signal isolation, it is not only easy to realize, and with low cost.
Embodiment 2
On the basis of embodiment 1, in the present embodiment, as shown in Fig. 2 described isolated from power unit also includes the 3rd electricity
Hold c3, the 4th electric capacity c4, the 5th electric capacity c5 and the 6th electric capacity c6, be connected to after described 3rd electric capacity c3 and the 4th electric capacity c4 parallel connection
Between two inputs (vcc, gnd) of isolated from power chip u1, connect after described 5th electric capacity c5 and the 6th electric capacity c6 parallel connection
Between two outfans (e_vcc, e_gnd) of isolated from power chip u1.
Because power supply easily produces electromagnetic interference, so in the present embodiment, using above-mentioned 3rd electric capacity c3, the 4th
Electric capacity c4, the 5th electric capacity c5 and the 6th electric capacity c6 filter isolated from power chip u1 before and after interference voltage so that encoder can
Obtain stable, good supply voltage.
Further, in order to realize current filtering, described isolated from power unit also includes the first inductance l2 and second electricity
Sense l3, described first inductance l2 are series at one of two inputs (vcc, gnd) of isolated from power chip u1, described second inductance
L3 is series at one of two outfans (e_vcc, e_gnd) of isolated from power chip u1.
In the present embodiment, described signal isolation unit also includes first resistor r1 and second resistance r2, described first electricity
Resistance r1 is parallel to the armature winding of transformator t1, and described second resistance r2 is parallel to the secondary windings of transformator t1.
As a kind of optimal way, in order to preferably suppress reverse current, described signal isolation unit also includes first
Electric capacity c1, the second electric capacity c2, the first diode d1 and the second diode d2, after described first electric capacity c1 and the second electric capacity c2 series connection
It is connected between two outfans (e_d+, e_d-) of common mode inductance l1, the connection of described first electric capacity c1 and the second electric capacity c2
Point ground connection, the anode of described first diode d1 and the anode of the second diode d2 are all grounded, the moon of described first diode d1
The negative electrode of pole and the second diode d2 is connected to two outfans (e_d+, e_d-) of common mode inductance l1.
The above is this utility model preferred embodiment, is not limited to this utility model, all in this practicality
Modification, equivalent or improvement made in new technical scope etc., should be included in the model that this utility model is protected
In enclosing.
Claims (5)
1. a kind of isolation and transmission circuit for encoder is it is characterised in that include isolated from power unit and signal isolation unit,
Wherein:
Described isolated from power unit includes isolated from power chip, and two inputs of described isolated from power chip are used for accessing confession
Piezoelectric voltage, two outfans of described isolated from power chip are used for connecting the power end of encoder；
Described signal isolation unit includes transformator and common mode inductance, and the armature winding of described transformator is parallel to encoder
Differential signal outputs, the secondary windings of described transformator are parallel to the input of common mode inductance, by described transformator with altogether
Mould inductance and by the isolation of the couple differential signals of encoder, and using the difference letter after the outfan output isolation of common mode inductance
Number.
2. be used for as claimed in claim 1 the isolation and transmission circuit of encoder it is characterised in that described isolated from power unit also
Include the 3rd electric capacity, the 4th electric capacity, the 5th electric capacity and the 6th electric capacity, be connected to after described 3rd electric capacity and the parallel connection of the 4th electric capacity
Between two inputs of isolated from power chip, after described 5th electric capacity and the parallel connection of the 6th electric capacity, it is connected to isolated from power chip
Between two outfans.
3. be used for as claimed in claim 1 the isolation and transmission circuit of encoder it is characterised in that described isolated from power unit also
Include the first inductance and the second inductance, described first inductance is series at one of two inputs of isolated from power chip, described
Second inductance is series at one of two outfans of isolated from power chip.
4. be used for as claimed in claim 1 the isolation and transmission circuit of encoder it is characterised in that described signal isolation unit also
Include first resistor and second resistance, described first resistor is parallel to the armature winding of transformator, described second resistance is in parallel
Secondary windings in transformator.
5. be used for as claimed in claim 1 the isolation and transmission circuit of encoder it is characterised in that described signal isolation unit also
Include the first electric capacity, the second electric capacity, the first diode and the second diode, connect after described first electric capacity and the second capacitances in series
It is connected between two outfans of common mode inductance, the junction point ground connection of described first electric capacity and the second electric capacity, described one or two pole
The anode of the anode of pipe and the second diode is all grounded, and the negative electrode of described first diode and the negative electrode of the second diode connect respectively
It is connected to two outfans of common mode inductance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620555978.9U CN205912030U (en) | 2016-06-08 | 2016-06-08 | A isolated transmission circuit for encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620555978.9U CN205912030U (en) | 2016-06-08 | 2016-06-08 | A isolated transmission circuit for encoder |
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| Publication Number | Publication Date |
|---|---|
| CN205912030U true CN205912030U (en) | 2017-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620555978.9U Active CN205912030U (en) | 2016-06-08 | 2016-06-08 | A isolated transmission circuit for encoder |
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| CN (1) | CN205912030U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110274704A (en) * | 2019-04-09 | 2019-09-24 | 苏州汇川技术有限公司 | A kind of system for detecting temperature |
-
2016
- 2016-06-08 CN CN201620555978.9U patent/CN205912030U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110274704A (en) * | 2019-04-09 | 2019-09-24 | 苏州汇川技术有限公司 | A kind of system for detecting temperature |
| CN110274704B (en) * | 2019-04-09 | 2024-06-04 | 苏州汇川技术有限公司 | Temperature detection system |
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