CN206644487U - A kind of adaptive photoelectricity is to feedback control circuit - Google Patents
A kind of adaptive photoelectricity is to feedback control circuit Download PDFInfo
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- CN206644487U CN206644487U CN201720339133.0U CN201720339133U CN206644487U CN 206644487 U CN206644487 U CN 206644487U CN 201720339133 U CN201720339133 U CN 201720339133U CN 206644487 U CN206644487 U CN 206644487U
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Abstract
A kind of adaptive photoelectricity be the utility model is related to feedback control circuit, including pwm signal input, the first filter circuit, operational amplifier, 3rd resistor, the 4th resistance, the 5th resistance, NPN triode, light emitting diode, phototriode, AD sample circuits；The normal phase input end that pwm signal input passes through the first filter circuit concatenation operation amplifier；The output end of operational amplifier connects the base stage of NPN triode by 3rd resistor；The emitter stage of NPN triode is by the 4th resistance eutral grounding, and the negative-phase input of concatenation operation amplifier；The negative pole of the colelctor electrode connecting luminous diode of NPN triode；The positive pole connection power supply of light emitting diode；The colelctor electrode of phototriode connects the 5th resistance first end, and connects the input of AD sample circuits, grounded emitter；The second end connection power supply of 5th resistance.What the utility model mainly solved is the adaptivity of printer paper positioning mark detecting.
Description
Technical field
Circuit field, more particularly to a kind of adaptive photoelectricity be the utility model is related to feedback control circuit.
Background technology
At present in printer field, the detecting widespread practice of black mark, seam mark or other positioning marks is to pass through light
The identification of electric transducer realizes, in use, it is impossible to realize adaptivity, accommodation is limited, and because interference is deposited
Forbidden in sheet positioning or directly miss some label positions, cause to be printed upon the word on printing paper, it is impossible to correct filling
On printing paper, more or less skew always occurs during printing.
Utility model content
The shortcomings that the purpose of this utility model is to overcome prior art, there is provided a kind of adaptive photoelectricity is to feedback control
Circuit.
In order to solve the above technical problems, the utility model employs following technical measures：
A kind of adaptive photoelectricity is to feedback control circuit, including pwm signal input, the first filter circuit, computing are put
Big device, 3rd resistor, the 4th resistance, the 5th resistance, NPN triode, light emitting diode, phototriode, AD sample circuits；Institute
State the normal phase input end that pwm signal input connects the operational amplifier by first filter circuit；The computing is put
The output end of big device connects the base stage of the NPN triode by the 3rd resistor；The emitter stage of the NPN triode passes through
4th resistance eutral grounding, and connect the negative-phase input of the operational amplifier；The colelctor electrode connection institute of the NPN triode
State the negative pole of light emitting diode；The positive pole connection power supply of the light emitting diode；The colelctor electrode connection institute of the phototriode
The 5th resistance first end is stated, and connects the input of the AD sample circuits, grounded emitter；Second end of the 5th resistance
Connect power supply.
As a further improvement, first filter circuit includes first resistor, the first electric capacity；The of the first resistor
One end connects the pwm signal input；Second end of the first resistor connects the first end of first electric capacity, and connects
The normal phase input end of the operational amplifier；The second end ground connection of first electric capacity.
As a further improvement, also including the second filter circuit, it is series at first filter circuit and is put with the computing
Between the normal phase input end of big device, connect to form second-order filter circuit with first filter circuit.
As a further improvement, second filter circuit includes second resistance, the second electric capacity；The of the second resistance
One end connects the second end of the first resistor；Second end of the second resistance connects the first end of second electric capacity, and
Connect the normal phase input end of the operational amplifier.
As a further improvement, the 5th resistance is fixed resistance, adjustable potentiometer or digital regulation resistance.
As a further improvement, also including voltage follower, the colelctor electrode of the phototriode and the AD are series at
Between the input of sample circuit.
As a further improvement, the light emitting diode is infrared light-emitting diode.
A kind of printer, including above-described adaptive photoelectricity is to feedback control circuit.
Compared with prior art, the utility model has advantages below：What the utility model mainly solved is printer
The adaptivity of sheet positioning mark detecting, can reach very big compatibility using adaptive photoelectricity to feedback circuit
Can, identified suitable for the sheet positioning of different sheet positioning mark or different colours, the scope of application is wider, while paper is determined
The detecting of bit identification is more accurate.
Brief description of the drawings
Accompanying drawing is used for providing further understanding to of the present utility model, and a part for constitution instruction, with this practicality
New embodiment is used for explaining the utility model together, does not form to limitation of the present utility model.
Accompanying drawing 1 is circuit theory diagrams of the adaptive photoelectricity of the present utility model to feedback control circuit.
Accompanying drawing 2 is a kind of embodiment circuit theory diagrams of the present utility model.
Main element symbol description
Pwm signal input 100
AD sample circuits 200
First filter circuit 300
Second filter circuit 400
Operational amplifier U1
Voltage follower U2
Embodiment
To make the purpose, technical scheme and advantage of the utility model embodiment clearer, below in conjunction with this practicality
Accompanying drawing in new embodiment, the technical scheme in the utility model embodiment is clearly and completely described.
, it is necessary to illustrate in description of the present utility model, herein, such as first and second or the like relation
Term is used merely to make a distinction an entity or operation with another entity or operation, and not necessarily requires or imply
Any this actual relation or order be present between these entities or operation.Moreover, term " comprising ", "comprising" or its
Any other variant is intended to including for nonexcludability so that process, method, article including a series of elements or
Equipment not only includes those key elements, but also the other element including being not expressly set out, or also include for this process,
Method, article or the intrinsic key element of equipment.In the absence of more restrictions.By sentence " including one ... limit
Fixed key element, it is not excluded that in addition identical also be present in the process including the key element, method, article or equipment will
Element ".
The correlation module being related in the system is hardware system module or is prior art Computer Software journey
The functional module that sequence or agreement are combined with hardware, computer software programs or agreement involved by the functional module itself
The technology being well known to those skilled in the art, it is not the improvements of the system；The system is improved between each module
Interaction relationship or annexation, as the overall construction of system is improved, solved to solve the system
Relevant art problem.
Below in conjunction with drawings and embodiments to a kind of adaptive photoelectricity of the present utility model to feedback control circuit
Make specific introduce.
Accompanying drawing 1 is referred to, a kind of adaptive photoelectricity is to feedback control circuit, including pwm signal input 100, first
Filter circuit 300, operational amplifier U1,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, NPN triode Q1, luminous two
Pole pipe D1, phototriode Q2, AD sample circuit 200；The pwm signal input 100 passes through first filter circuit 300
Connect the normal phase input end of the operational amplifier U1；The output end of the operational amplifier U1 is connected by the 3rd resistor R3
Connect the base stage of the NPN triode Q1；The emitter stage of the NPN triode Q1 is grounded by the 4th resistance R4, and is connected
The negative-phase input of the operational amplifier U1；The colelctor electrode of the NPN triode Q1 connects the negative of the light emitting diode D1
Pole；The positive pole connection power supply VCC of the light emitting diode D1；The colelctor electrode of the phototriode Q2 connects the 5th resistance
R5 first ends, and connect the input of the AD sample circuits, grounded emitter；The second end connection electricity of 5th resistance
Source, in other embodiments, the 5th resistance R5 and the AD sample circuits can be connected to the phototriode Q2's
Emitter stage.Preferably, the light emitting diode D1 uses infrared light-emitting diode, and the infrared light emitting diodes are with saturating
Mirror, directive property are sensitiveer.
Concrete principle, the pwm signal input 100 input the voltage waveform of certain dutycycle, by the described first filter
Wave circuit 300 forms steady dc voltage, and the base stage of the NPN triode Q1 is provided by operational amplifier U1 amplifications
Electric current, the 4th resistance R4 increases sampling relevant voltage V- with electric current after the NPN triode Q1 conducting, feeds back to the fortune
Amplifier U1 negative phase end is calculated, after circuit balancing, electric current is being equal to the operational amplifier U1 just on the 4th resistance R4
Phase input voltage V+ divided by the 4th resistance R4 resistance.The electric current that can obtain the light emitting diode D1 is：
ID1=V-/R4* β/(β+1)=V+/R4* β/(β+1)=VDD*D/R4* β/(β+1) ≈ VDD*D/R4.
Wherein β is the multiplication factor of the NPN triode Q1；VDD is the supply voltage of MCU where pwm signal；D is PWM
Signal dutyfactor.
During concrete application, the light of the light emitting diode D1 identifies by different sheet positionings, reaches described photosensitive
Triode Q2, caused photoelectric current is also different, photoelectric current flow through the 5th resistance R5 caused by voltage, be sent to the AD and adopt
Controller is sent to after sample circuit 200, judges whether the AD values reach predetermined value by controller, if do not reached predetermined
Value, the MCU where pwm signal suitably adjust the dutycycle of pwm signal, to adjust the electric current of the light emitting diode D1, finally
Reach the predetermined AD values of corresponding MCU, sheet positioning mark is judged according to the adjustment situation of pwm signal dutycycle and predetermined value
Know, it is achieved thereby that circuit positions the adaptivity of mark to different paper.Wherein, described predetermined AD values are that printer uses
During new paper, paper entire scan can be sampled first, it is predetermined AD values then to take signal to noise ratio highest value.
Further, in the utility model preferred embodiment, first filter circuit 300 includes first resistor
R1, the first electric capacity C1；The first end of the first resistor R1 connects the pwm signal input 100；The first resistor R1's
Second end connects the first end of the first electric capacity C1, and connects the normal phase input end of the operational amplifier U1；Described first
Electric capacity C1 the second end ground connection.It is low using RC filter circuit small volumes, cost.
Referring to Fig. 2, it is further, in the utility model preferred embodiment, in addition to the second filter circuit 400,
It is series between first filter circuit 300 and the operational amplifier U1 normal phase input end, with first filtered electrical
The series connection of road 300 forms second-order filter circuit, and dynamic response can be improved using second-order filter circuit.
Further, in the utility model preferred embodiment, second filter circuit 400 includes second resistance
R2, the second electric capacity C2；The first end of the second resistance R2 connects the second end of the first resistor R1；The second resistance R2
The second end connect the first end of the second electric capacity C2, and connect the normal phase input end of the operational amplifier U1.
Further, in the utility model preferred embodiment, the 5th resistance R5 is fixed resistance, adjustable potential
Device or digital regulation resistance.
Further, in the utility model preferred embodiment, in addition to voltage follower U2, it is series at described photosensitive
Between the input of triode Q2 colelctor electrode and the AD sample circuits 200, for strengthening driving force.
A kind of printer, including above-described adaptive photoelectricity is to feedback control circuit.
Preferred embodiment of the present utility model is the foregoing is only, it is all at this not to limit the utility model
Within the spirit and principle of utility model, any modification, equivalent substitution and improvements done etc., the utility model should be included in
Within the scope of protection.
Claims (8)
1. a kind of adaptive photoelectricity is to feedback control circuit, it is characterised in that：Including pwm signal input, the first filtered electrical
Road, operational amplifier, 3rd resistor, the 4th resistance, the 5th resistance, NPN triode, light emitting diode, phototriode, AD are adopted
Sample circuit；
The pwm signal input connects the normal phase input end of the operational amplifier by first filter circuit；
The output end of the operational amplifier connects the base stage of the NPN triode by the 3rd resistor；The poles of NPN tri-
The emitter stage of pipe connects the negative-phase input of the operational amplifier by the 4th resistance eutral grounding；
The colelctor electrode of the NPN triode connects the negative pole of the light emitting diode；The positive pole connection electricity of the light emitting diode
Source；
The colelctor electrode of the phototriode connects the 5th resistance first end, and connects the input of the AD sample circuits
End, grounded emitter；The second end connection power supply of 5th resistance.
2. adaptive photoelectricity according to claim 1 is to feedback control circuit, it is characterised in that：First filtered electrical
Road includes first resistor, the first electric capacity；The first end of the first resistor connects the pwm signal input；First electricity
Second end of resistance connects the first end of first electric capacity, and connects the normal phase input end of the operational amplifier；Described first
The second end ground connection of electric capacity.
3. adaptive photoelectricity according to claim 2 is to feedback control circuit, it is characterised in that：Also include the second filtering
Circuit, it is series between first filter circuit and the normal phase input end of the operational amplifier, with first filtered electrical
Connect to form second-order filter circuit in road.
4. adaptive photoelectricity according to claim 3 is to feedback control circuit, it is characterised in that：Second filtered electrical
Road includes second resistance, the second electric capacity；The first end of the second resistance connects the second end of the first resistor；Described second
Second end of resistance connects the first end of second electric capacity, and connects the normal phase input end of the operational amplifier.
5. adaptive photoelectricity according to claim 1 is to feedback control circuit, it is characterised in that：5th resistance is
Fixed resistance, adjustable potentiometer or digital regulation resistance.
6. adaptive photoelectricity according to claim 1 is to feedback control circuit, it is characterised in that：Also include voltage follow
Device, it is series between the colelctor electrode of the phototriode and the input of the AD sample circuits.
7. adaptive photoelectricity according to claim 1 is to feedback control circuit, it is characterised in that：The light emitting diode
For infrared light-emitting diode.
8. a kind of printer, it is characterised in that including the adaptive photoelectricity described in claim 1-7 to feedback control circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720339133.0U CN206644487U (en) | 2017-03-31 | 2017-03-31 | A kind of adaptive photoelectricity is to feedback control circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720339133.0U CN206644487U (en) | 2017-03-31 | 2017-03-31 | A kind of adaptive photoelectricity is to feedback control circuit |
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| Publication Number | Publication Date |
|---|---|
| CN206644487U true CN206644487U (en) | 2017-11-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201720339133.0U Active CN206644487U (en) | 2017-03-31 | 2017-03-31 | A kind of adaptive photoelectricity is to feedback control circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110597140A (en) * | 2019-09-26 | 2019-12-20 | 深圳博用科技有限公司 | Technology for feeding back state of vehicle motor and controller through PWM signal |
| CN111959136A (en) * | 2020-08-12 | 2020-11-20 | 福建实达电脑设备有限公司 | Paper page seam identification method |
| CN112373200A (en) * | 2020-10-28 | 2021-02-19 | 珠海泽冠科技有限公司 | Paper positioning and driving device of label printer and application method thereof |
| CN115107382A (en) * | 2022-07-25 | 2022-09-27 | 上海商米科技集团股份有限公司 | Photoelectric sensing device of printer |
-
2017
- 2017-03-31 CN CN201720339133.0U patent/CN206644487U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110597140A (en) * | 2019-09-26 | 2019-12-20 | 深圳博用科技有限公司 | Technology for feeding back state of vehicle motor and controller through PWM signal |
| CN111959136A (en) * | 2020-08-12 | 2020-11-20 | 福建实达电脑设备有限公司 | Paper page seam identification method |
| CN111959136B (en) * | 2020-08-12 | 2022-05-13 | 福建实达电脑设备有限公司 | Paper seam recognition method |
| CN112373200A (en) * | 2020-10-28 | 2021-02-19 | 珠海泽冠科技有限公司 | Paper positioning and driving device of label printer and application method thereof |
| CN115107382A (en) * | 2022-07-25 | 2022-09-27 | 上海商米科技集团股份有限公司 | Photoelectric sensing device of printer |
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