CN207113900U - A kind of encoder opto-electronic compensation circuit and photoelectric encoder - Google Patents
A kind of encoder opto-electronic compensation circuit and photoelectric encoder Download PDFInfo
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- CN207113900U CN207113900U CN201721163338.4U CN201721163338U CN207113900U CN 207113900 U CN207113900 U CN 207113900U CN 201721163338 U CN201721163338 U CN 201721163338U CN 207113900 U CN207113900 U CN 207113900U
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Abstract
The utility model provides a kind of encoder opto-electronic compensation circuit and photoelectric encoder.Wherein, circuit includes：Light-emitting component, original screen panel, photo detector and voltage-regulating circuit, the optical signal that the light-emitting component is sent are irradiated to after the original screen panel on the photo detector, and the photo detector exports the first photoelectric current；The voltage-regulating circuit, for generating first voltage according to first photoelectric current, the first voltage acts on the both ends of the light-emitting component；The first voltage increases with the reduction of the first photoelectric current, reduces with the increase of the first photoelectric current.Scheme provided by the utility model can automatically adjust the light value of encoder, ensure the stability of encoder in use.
Description
Technical field
It the utility model is related to electronic circuit field, more particularly to a kind of encoder opto-electronic compensation circuit and photoelectric coding
Device.
Background technology
The optical profile type that optical-electricity encoder is made up of a series of components such as light-emitting component, photo detector, original screen panel fills
Put, the initial analog quantity original signal of the optical profile type device be by photo detector (for example, PD) by light-emitting component (for example,
LED brightness) is carried out caused by opto-electronic conversion, therefore the brightness change of light-emitting component is defeated by the signal for directly affecting encoder
Go out.The brightness of encoder light-emitting component during use can be influenceed by external condition and the length of itself usage time and
Change, therefore how to ensure the brightness of encoder light-emitting component, affect the job stability of photoelectric encoder.Photoelectricity at present
The light-emitting component of encoder be it is simple opened and shut off by threshold current, when by external condition influenceed and with
The brightness of the passage light-emitting component of usage time will change so that the job stability of photoelectric encoder is affected.
The content of the invention
The defects of main purpose of the present utility model is to overcome above-mentioned prior art, more particularly to a kind of encoder photoelectricity
Compensation circuit and photoelectric encoder, to solve in the prior art because the brightness of light-emitting component changes to photoelectric encoder stability
Caused influence.
On the one hand the utility model provides a kind of encoder opto-electronic compensation circuit, including light-emitting component, original screen panel, light
Element and voltage-regulating circuit, the optical signal that the light-emitting component is sent are irradiated to the light member after the original screen panel
On part, the photo detector exports the first photoelectric current；The voltage-regulating circuit, for according to first photoelectric current generation the
One voltage, the first voltage act on the both ends of the light-emitting component；The first voltage is with the reduction of the first photoelectric current
And increase, reduce with the increase of the first photoelectric current.
Alternatively, the voltage-regulating circuit includes change-over circuit and switch element, the change-over circuit, for by first
Photoelectric current is converted into second voltage, and the second voltage is first frequency, the square wave of the first dutycycle；The switch element,
Break-make generation first frequency, the first voltage of the first dutycycle under the triggering of the second voltage.
Alternatively, the change-over circuit includes the first operational amplifier and the second operational amplifier, and first computing is put
Big device is used to the first photoelectric current being converted into tertiary voltage, and the tertiary voltage is sine wave, and second operational amplifier is used
In the tertiary voltage is converted into the second voltage.
Alternatively, the relation of first photoelectric current and the tertiary voltage is：
VF1=A-B × I；
A, B are constant coefficient, and I is the first photoelectric current, and VF1 is tertiary voltage.
The another aspect of the utility model provides a kind of photoelectric encoder, including a kind of any of the above-described described encoder light
Electronic compensating circuit.
Scheme of the present utility model, relative to scheme of the prior art, the light value of encoder can be automatically adjusted, is protected
Demonstrate,prove the stability of encoder in use.
Brief description of the drawings
Accompanying drawing described herein is used for providing further understanding to of the present utility model, a part for utility model, this
The schematic description and description of utility model is used to explain the utility model, does not form to improper limit of the present utility model
It is fixed.In the accompanying drawings：
Fig. 1 is the structural representation of an embodiment of encoder opto-electronic compensation circuit provided by the utility model；
Fig. 2 is the structural representation of an embodiment of voltage-regulating circuit provided by the utility model；
Fig. 3 is the structural representation of an embodiment of change-over circuit provided by the utility model；
Fig. 4 is the structural representation of an embodiment of photoelectric encoder provided by the utility model；
Fig. 5 is the circuit diagram of an embodiment of encoder opto-electronic compensation circuit provided by the utility model；
Fig. 6 is the oscillogram of an embodiment of encoder opto-electronic compensation circuit provided by the utility model.
Embodiment
It is specific below in conjunction with the utility model to make the purpose of this utility model, technical scheme and advantage clearer
Technical solutions of the utility model are clearly and completely described for embodiment and corresponding accompanying drawing.Obviously, described embodiment
Only it is the utility model part of the embodiment, rather than whole embodiments.Based on the embodiment in the utility model, this area
The every other embodiment that those of ordinary skill is obtained under the premise of creative work is not made, belongs to the utility model
The scope of protection.
It should be noted that term " first " in specification and claims of the present utility model and above-mentioned accompanying drawing,
" second " etc. is for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so
The data used can exchange in the appropriate case, so that embodiment of the present utility model described herein can be with except at this
In diagram or description those beyond order implement.In addition, term " comprising " and " having " and their any deformation, meaning
Figure be to cover it is non-exclusive include, for example, containing the process of series of steps or unit, method, system, product or equipment
Be not necessarily limited to those steps or the unit clearly listed, but may include not list clearly or for these processes,
The intrinsic other steps of method, product or equipment or unit.
Fig. 1 is the structural representation of an embodiment of encoder opto-electronic compensation circuit provided by the utility model.
As shown in figure 1, a kind of encoder opto-electronic compensation circuit 11 provided by the utility model, including light-emitting component 111, light
Screen 112, photo detector 113 and voltage-regulating circuit 114.
The optical signal that light-emitting component is sent is irradiated on photo detector after original screen panel, and photo detector exports the first photoelectricity
Stream.
Light-emitting component, such as LED, the light of transmitting are connect after original screen panel by photo detector, such as photodiode (PD)
Receive, photodiode converts optical signals to electric signal.Because original screen panel is light and dark impartial striped, therefore photo detector
First photoelectric current of output is into sine.
Voltage-regulating circuit, for generating first voltage according to the first photoelectric current, first voltage acts on the luminous member
The both ends of part.First voltage increases with the reduction of the first photoelectric current, reduces with the increase of the first photoelectric current.
First voltage, it is the voltage (LED load voltage) at light-emitting component both ends, it is in inverse relation with the first photoelectric current,
When light-emitting component light value reduces, the first photoelectric current declines, voltage-regulating circuit adjust automatically first voltage so that the first electricity
Pressure increase.When light-emitting component light value increase, the increase of the first photoelectric current, voltage-regulating circuit adjust automatically first voltage, make
First voltage is obtained to reduce.By the adjustment of voltage-regulating circuit, the light value of light-emitting component can be maintained in certain scope,
Therefore the reliability of code device signal output is effectively improved.
Fig. 2 is the structural representation of an embodiment of voltage-regulating circuit provided by the utility model.The utility model one
Embodiment, with reference to the various aspects of other embodiment.
Voltage-regulating circuit 214 includes change-over circuit 2141 and switch element 2142.
Change-over circuit, for the first photoelectric current to be converted into second voltage, the second voltage is first frequency, and first accounts for
The square wave of empty ratio.First photoelectric current is sine wave, and second voltage is the square wave of identical frequency.
The switch element, under the triggering of the second voltage break-make generation first frequency, described in the first dutycycle
First voltage.Switch element, such as triode, second voltage trigger switch element cause switching elements conductive or disconnection, so as to
Form frequency identical with second voltage, the first voltage of same duty cycle.First voltage is PWM ripples (pulse width modulation), its
Dutycycle is adjustable.The size of average voltage can be changed by changing duty, so as to control the brightness of light-emitting component.
Fig. 3 is the structural representation of an embodiment of change-over circuit provided by the utility model.The utility model one is specific
Embodiment, with reference to the various aspects of other embodiment.
Change-over circuit 2141 includes the first operational amplifier 21411 and the second operational amplifier 21412.First operation amplifier
Device is used to the first photoelectric current being converted into tertiary voltage, and the tertiary voltage is sine wave.
For example, the relation of the first photoelectric current and tertiary voltage can be：
VF1=A-B × I；
A, B are constant coefficient, and I is the first photoelectric current, and VF1 is tertiary voltage.
Second operational amplifier is used to tertiary voltage being converted into second voltage, i.e., sine wave is converted into same frequency
The square wave of rate.
Fig. 4 is the structural representation of an embodiment of photoelectric encoder provided by the utility model.The utility model one has
Body embodiment, with reference to the various aspects of other embodiment.
Photoelectric encoder 3, including the encoder opto-electronic compensation circuit that each embodiment of the utility model provides.
Fig. 5 is the circuit diagram of an embodiment of encoder opto-electronic compensation circuit provided by the utility model.Fig. 6 is this practicality
The oscillogram of one embodiment of the encoder opto-electronic compensation circuit of new offer.
In this embodiment, the light of light-emitting component LED transmittings is received after original screen panel by photo detector, forms the
One photoelectric current I.Photo detector converts optical signals to electric signal, because original screen panel is light and dark impartial striped, therefore by
First photoelectric current of optical element output is into sine.
First electric current is inputted to the first operational amplifier IC1B negative term port, the first operational amplifier by resistance R4
IC1B positive port is connected by R5 with 3.3V voltage, by R10 with to being connected, resistance R3 is connected across the first operation amplifier
Between device IC1B output ends and negative term port.
It is assumed that R4=20K, R5=13K, R10=20K, R3=120K, IC1B positives can be calculated according to resistance value
Input terminal voltage, (3.3-V1)/13=V1/20, therefore V1=2V.
Voltage signal VF1 is produced after first time operational amplifier IC1B, can be with by the calculation of operational amplifier
Draw：(V1-VF1)/R3=I, wherein I magnitude are uA, therefore are drawn：VF1=2-0.12 × I；Wherein constant A is 2, constant
B is that 0.12, I is the first photoelectric current, and VF1 is tertiary voltage.
VF1 generates VF2 after second of operational amplifier IC1A.VF1 inputs IC1A positive port, IC1A negative term
Port is connected by R1 with 3.3V power supplys, is connected to the ground by R2, electric capacity C1 be connected across IC1A negative term port and output end it
Between.IC1A is operated in the pattern of comparator, reference voltage V3=1.2V, therefore the voltage signal generated after IC1A
VF2 is square wave,
VF2 further by controlling switch element QN1 (NPN type triode) break-make, at VF3 generation and VF2 frequencies,
Dutycycle identical PWM ripples, then change the size of average voltage by controlling the dutycycle of PWM wave height level again, so as to
Reach the purpose of control LED load voltage, the control of LED light brightness is realized with this.
As shown in fig. 6, the first photoelectric current is sine wave, DC level 7uA, amplitude 7uA, frequency 50Hz, by being calculated
VF3 average voltage is 4.0V, shown in equation below,
VF3=VLow level× dutycycleLow level+VHigh level× dutycycleHigh level
=3.35 × 0.507+4.68 × 0.493=4.0V
Release the voltage V at LED both endsLWD=5V-4.0V=1.0V, change the amplitude of the first photoelectric current in the same way
Size, LED load voltage corresponding to 10 groups is drawn, it is as shown in the table：
| I | 2 | 4 | 6 | 8 | 10 | 12 | 14 | 16 | 18 | 20 |
| V_LED | 1.9 | 1.75 | 1.6 | 1.31 | 1.14 | 1.03 | 1 | 0.9 | 0.87 | 0.83 |
This it appears that the first photoelectric current and V_LED (LED load voltage) VLEDInversely prroportional relationship is showed, that is, works as LED
When light value reduces, the first photoelectric current declines, and light compensation loop can automatically adjust LED load voltage so that VLEDIncrease；
When LED light bright values increase, the first photoelectric current rise, light compensation loop can automatically adjust LED load voltage, make VLEDSubtract
It is small, so as to maintain LED light value to be maintained in certain scope, effectively improve the reliability of code device signal output.
Thus, using scheme of the present utility model, solve in the prior art because the brightness of light-emitting component changes to light
Influenceed caused by photoelectric coder stability, automatically adjust the light value of encoder, ensure the stabilization of encoder in use
Property.
Embodiment of the present utility model is the foregoing is only, is not limited to the utility model, for this area
Technical staff for, the utility model can have various modifications and variations.It is all within the spirit and principles of the utility model,
Any modification, equivalent substitution and improvements made etc., it should be included within right of the present utility model.
Claims (5)
1. a kind of encoder opto-electronic compensation circuit, it is characterised in that including light-emitting component, original screen panel, photo detector and voltage
Adjustment circuit,
The optical signal that the light-emitting component is sent is irradiated to after the original screen panel on the photo detector, the photo detector
Export the first photoelectric current；
The voltage-regulating circuit, for generating first voltage according to first photoelectric current, the first voltage acts on institute
State the both ends of light-emitting component；
The first voltage increases with the reduction of the first photoelectric current, reduces with the increase of the first photoelectric current.
2. circuit according to claim 1, it is characterised in that the voltage-regulating circuit includes change-over circuit and switch member
Part,
The change-over circuit, for the first photoelectric current to be converted into second voltage, the second voltage is first frequency, and first accounts for
The square wave of empty ratio；
The switch element, break-make generation first frequency, described the first of the first dutycycle under the triggering of the second voltage
Voltage.
3. circuit according to claim 2, it is characterised in that the change-over circuit includes the first operational amplifier and second
Operational amplifier, first operational amplifier are used to the first photoelectric current being converted into tertiary voltage, and the tertiary voltage is just
String ripple, second operational amplifier are used to the tertiary voltage being converted into the second voltage.
4. circuit according to claim 3, it is characterised in that the relation of first photoelectric current and the tertiary voltage
For：
VF1=A-B × I；
A, B are constant coefficient, and I is the first photoelectric current, and VF1 is tertiary voltage.
5. a kind of photoelectric encoder, it is characterised in that including a kind of encoder opto-electronic compensation as described in claim 1-4 is any
Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721163338.4U CN207113900U (en) | 2017-09-11 | 2017-09-11 | A kind of encoder opto-electronic compensation circuit and photoelectric encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721163338.4U CN207113900U (en) | 2017-09-11 | 2017-09-11 | A kind of encoder opto-electronic compensation circuit and photoelectric encoder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207113900U true CN207113900U (en) | 2018-03-16 |
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ID=61587195
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721163338.4U Active CN207113900U (en) | 2017-09-11 | 2017-09-11 | A kind of encoder opto-electronic compensation circuit and photoelectric encoder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107631740A (en) * | 2017-09-11 | 2018-01-26 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of encoder opto-electronic compensation circuit, method and photoelectric encoder |
-
2017
- 2017-09-11 CN CN201721163338.4U patent/CN207113900U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107631740A (en) * | 2017-09-11 | 2018-01-26 | 珠海格力节能环保制冷技术研究中心有限公司 | A kind of encoder opto-electronic compensation circuit, method and photoelectric encoder |
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