CN107631740A - A kind of encoder opto-electronic compensation circuit, method and photoelectric encoder - Google Patents
A kind of encoder opto-electronic compensation circuit, method and photoelectric encoder Download PDFInfo
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- CN107631740A CN107631740A CN201710813929.XA CN201710813929A CN107631740A CN 107631740 A CN107631740 A CN 107631740A CN 201710813929 A CN201710813929 A CN 201710813929A CN 107631740 A CN107631740 A CN 107631740A
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- voltage
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Abstract
The present invention provides a kind of encoder opto-electronic compensation circuit, method 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 invention can automatically adjust the light value of encoder, ensure the stability of encoder in use.
Description
Technical field
The present invention relates to electronic circuit field, more particularly to a kind of encoder opto-electronic compensation circuit, method 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 it is a primary object of the present invention to overcome above-mentioned prior art, more particularly to a kind of encoder opto-electronic compensation
Circuit, method and photoelectric encoder, to solve in the prior art because the brightness change of light-emitting component is stable to photoelectric encoder
Property caused by influence.
One aspect of the present invention provides a kind of encoder opto-electronic compensation circuit, including 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 the photo detector after the original screen panel
On, the photo detector exports the first photoelectric current；The voltage-regulating circuit, for generating first according to first photoelectric current
Voltage, the first voltage act on the both ends of the light-emitting component；The first voltage with the reduction of the first photoelectric current and
Increase, reduces 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.
Another aspect of the invention provides a kind of photoelectric encoder, including a kind of any of the above-described described encoder photoelectricity is mended
Repay circuit.
Further aspect of the present invention provides a kind of encoder opto-electronic compensation method, and methods described is used to include luminous member
Part, original screen panel, the circuit of photo detector, the optical signal that the light-emitting component is sent be irradiated to after the original screen panel it is described by
On optical element, the photo detector exports the first photoelectric current；Also include voltage regulation step, for according to first photoelectric current
First voltage is generated, the first voltage acts on the both ends of the light-emitting component；The first voltage is with the first photoelectric current
Reduction and increase, reduce with the increase of the first photoelectric current.
Alternatively, the voltage regulation step includes switch process and switching step, the switch process, 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 switching step, is opened
Close element break-make generation first frequency, first voltage of the first dutycycle under the triggering of the second voltage.
Alternatively, the switch process includes the first switch process and the second switch process, and first switch process is used
In the first photoelectric current is converted into tertiary voltage, the tertiary voltage is sine wave, and second switch process is used for by described in
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 solution of the present invention, relative to scheme of the prior art, the light value of encoder can be automatically adjusted, ensures to compile
The stability of code device in use.
Brief description of the drawings
Accompanying drawing described herein is used for providing a further understanding of the present invention, forms the part of the present invention, this hair
Bright schematic description and description is used to explain the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the structural representation of an embodiment of encoder opto-electronic compensation circuit provided by the invention；
Fig. 2 is the structural representation of an embodiment of voltage-regulating circuit provided by the invention；
Fig. 3 is the structural representation of an embodiment of change-over circuit provided by the invention；
Fig. 4 is the structural representation of an embodiment of photoelectric encoder provided by the invention；
Fig. 5 is the circuit diagram of an embodiment of encoder opto-electronic compensation circuit provided by the invention；
Fig. 6 is the oscillogram of an embodiment of encoder opto-electronic compensation circuit provided by the invention；
Fig. 7 is the method schematic diagram of an embodiment of encoder opto-electronic compensation method provided by the invention.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with the specific embodiment of the invention and
Technical solution of the present invention is clearly and completely described corresponding accompanying drawing.Obviously, described embodiment is only the present invention one
Section Example, rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not doing
Go out under the premise of creative work the every other embodiment obtained, belong to the scope of protection of the invention.
It should be noted that term " first " in description and claims of this specification and above-mentioned accompanying drawing, "
Two " etc. be for distinguishing similar object, without for describing specific order or precedence.It should be appreciated that so use
Data can exchange in the appropriate case, so as to embodiments of the invention described herein can with except illustrating herein or
Order beyond those of description is implemented.In addition, term " comprising " and " having " and their any deformation, it is intended that cover
Cover it is non-exclusive include, be not necessarily limited to for example, containing the process of series of steps or unit, method, system, product or equipment
Those steps or unit clearly listed, but may include not list clearly or for these processes, method, product
Or the intrinsic other steps of equipment or unit.
Fig. 1 is the structural representation of an embodiment of encoder opto-electronic compensation circuit provided by the invention.
As shown in figure 1, a kind of encoder opto-electronic compensation circuit 11 provided by the invention, including light-emitting component 111, original screen panel
112nd, 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 invention.The present invention one is embodied
Mode, 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 invention.The embodiment of the invention,
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 invention.A specific embodiment party of the invention
Formula, with reference to the various aspects of other embodiment.
Photoelectric encoder 3, including the encoder opto-electronic compensation circuit that each embodiment of the present invention provides.
Fig. 5 is the circuit diagram of an embodiment of encoder opto-electronic compensation circuit provided by the invention.Fig. 6 is offer of the present invention
Encoder opto-electronic compensation circuit an embodiment oscillogram.
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 endsLED=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, subtract VLED
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.
Fig. 7 is the method schematic diagram of an embodiment of encoder opto-electronic compensation method provided by the invention.The present invention one has
Body embodiment, with reference to the various aspects of other embodiment.
A kind of encoder opto-electronic compensation method, this method are used to include light-emitting component, original screen panel, the electricity of photo detector
Road, including step S410, S420.
Step S410, the optical signal that light-emitting component is sent are irradiated on photo detector after original screen panel, the light member
Part exports the first photoelectric current.
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.
Step S420, first voltage is generated according to first photoelectric current, the first voltage acts on the luminous member
The both ends of part；The first voltage increases with the reduction of the first photoelectric current, reduces with the increase of the first photoelectric current.Should
Step is voltage regulation step.
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.
Alternatively, the voltage regulation step includes switch process and switching step.
Switch process, 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.
Switching step, switch element break-make generation first frequency, first dutycycle under the triggering of the second voltage
The 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 that PWM ripples (adjust by pulse width
System), 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.
Alternatively, switch process includes the first switch process and the second switch process, and first switch process is used for will
First photoelectric current is converted into tertiary voltage, and the tertiary voltage is sine wave, and second switch process is used for the described 3rd
Voltage conversion turns 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.
Thus, using the solution of the present invention, solve in the prior art because the brightness change of light-emitting component is compiled to photoelectricity
Influenceed caused by code device stability, automatically adjust the light value of encoder, ensure the stability of encoder in use.
Embodiments of the invention are the foregoing is only, are not intended to limit the invention, for those skilled in the art
For member, the present invention can have various modifications and variations.Any modification within the spirit and principles of the invention, being made,
Equivalent substitution, improvement etc., should be included within scope of the presently claimed invention.
Claims (9)
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.
A kind of 6. encoder opto-electronic compensation method, it is characterised in that methods described is used to include light-emitting component, original screen panel, by
The circuit of optical element,
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；
Also include voltage regulation step, 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.
7. according to the method for claim 6, it is characterised in that the voltage regulation step includes switch process and switch walks
Suddenly,
The switch process, 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 switching step, switch element break-make generation first frequency, first dutycycle under the triggering of the second voltage
The first voltage.
8. according to the method for claim 7, it is characterised in that the switch process includes the first switch process and second turn
Change step, first switch process is used to the first photoelectric current being converted into tertiary voltage, and the tertiary voltage is sine wave, institute
The second switch process is stated to be used to the tertiary voltage being converted into the second voltage.
9. according to the method for claim 8, 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710813929.XA CN107631740A (en) | 2017-09-11 | 2017-09-11 | A kind of encoder opto-electronic compensation circuit, method and photoelectric encoder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710813929.XA CN107631740A (en) | 2017-09-11 | 2017-09-11 | A kind of encoder opto-electronic compensation circuit, method and photoelectric encoder |
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| CN107631740A true CN107631740A (en) | 2018-01-26 |
Family
ID=61101183
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| CN201710813929.XA Pending CN107631740A (en) | 2017-09-11 | 2017-09-11 | A kind of encoder opto-electronic compensation circuit, method and photoelectric encoder |
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