CN205648077U - LED sends out light controlling circuit - Google Patents
LED sends out light controlling circuit Download PDFInfo
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- CN205648077U CN205648077U CN201620215749.2U CN201620215749U CN205648077U CN 205648077 U CN205648077 U CN 205648077U CN 201620215749 U CN201620215749 U CN 201620215749U CN 205648077 U CN205648077 U CN 205648077U
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- light
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- 238000010586 diagram Methods 0.000 description 10
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- 102100036285 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Human genes 0.000 description 2
- 101000875403 Homo sapiens 25-hydroxyvitamin D-1 alpha hydroxylase, mitochondrial Proteins 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/30—Semiconductor lamps, e.g. solid state lamps [SSL] light emitting diodes [LED] or organic LED [OLED]
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Abstract
The utility model discloses a LED sends out light controlling circuit, include: drive unit, first resistance, switch element, three terminal regulator, light emitting component, second resistance, power, drive unit electric connection the one end of first resistance, the other end electric connection of first resistance switch element's control end with three terminal regulator's input, switch element's one end electric connection light emitting component's one end, other end electric connection three terminal regulator's an output with the one end of second resistance, light emitting component's other end electric connection the power, another output electric connection of three terminal regulator the other end and the ground wire of second resistance. The utility model discloses an after LED sends out light controlling circuit used three terminal regulator, the precision can improve to 1%, and stability is high, and it is farther to detect the distance, receives influence of temperature very little.
Description
Technical field
The disclosure relates in general to electronic circuit technology field, is specifically related to a kind of LED emission control circuit.
Background technology
The device such as photoelectric sensor, Fibre Optical Sensor is the presence or absence of the various nature examination objects utilizing light
With the sensor of apparent condition change etc., mainly by luminous light-projecting portion and the light accepting part structure that accepts light
Become.Photoelectric sensor is broadly divided into 3 classes as shown in Figure 1A to C, and wherein Figure 1A is correlation type,
Light-projecting portion 11 and light accepting part 12 are respectively in detection object 13 both sides, different according to the object placed, and are subject to
The light quantity that light portion 12 receives is different, such as, when the complete object to be detected of light hides, then light accepting part connects
Can not receive light.Figure 1B is retroreflecting type, and light-projecting portion 11 and light accepting part 12 are at detection object 13
Homonymy, detection object 13 opposite side arranges a retroreflecting plate 14, the luminous reflectance received is returned detection
Object 13.Fig. 1 C is diffusion reflection pattern, and light-projecting portion 11 and light accepting part 12 are detecting object 13 homonymy,
Obscured or the reflection because detection object is different of the light of projection, the amount arriving light accepting part will become
Change.Above-mentioned 3 types, are all that the light of reception is converted to electric signal by light accepting part, export.
Above-mentioned detection be used mostly visible light (predominantly red, also to judge color by green, blueness) and
Infrared light.
For making light stable, luminous precision should be improved, in emission control circuit of the prior art, drive
The output voltage device deviation on galvanic electricity road is big, circuit as shown in Figure 2 A, drives IC output voltage
Device deviation is big, and deviation about ± 12.8% adds the voltage Vbe between the base stage of audion and emitter stage
Deviation (+10%；-5.5%), the maximum deviation of light projector voltage is (+23.4%；-26.1%).Such as Fig. 2 B
Shown circuit, uses operational amplifier that the output voltage of drive circuit is introduced directly into audion
Emitter stage, can avoid the voltage Vbe deviation between transistor base and emitter stage.Light projector voltage
Maximum deviation be drive IC device deviation, about ± 12.8%.All there is light projector voltage in foregoing circuit
The problem that deviation is big.
Therefore, for reducing light projector voltage deviation a kind of new LED emission control circuit of needs.
It is only used for strengthening the reason of background of this disclosure in information above-mentioned disclosed in described background section
Solving, therefore it can include not constituting the information to prior art known to persons of ordinary skill in the art.
Utility model content
The disclosure provides a kind of LED emission control circuit, it is possible to reduce light projector voltage deviation, improves inspection
Survey precision.
Other characteristics of the disclosure and advantage will be apparent from by detailed description below, or partly
The acquistion by the practice of the disclosure.
According to the first aspect of the disclosure, a kind of LED emission control circuit, including: driver element,
First resistance, switch element, three terminal regulator, light-emitting component, the second resistance, power supply, described in drive
Moving cell is electrically connected with one end of described first resistance；The other end of described first resistance is electrically connected with institute
That states switch element controls end and the input of described three terminal regulator；One end electricity of described switch element
Property connect described light-emitting component one end, the other end be electrically connected with described three terminal regulator an outfan
One end with described second resistance；The other end of described light-emitting component is electrically connected with described power supply；Described
Another outfan of three terminal regulator is electrically connected with the other end and the ground wire of described second resistance.
An embodiment according to the disclosure, also includes that energy-storage travelling wave tube, described energy-storage travelling wave tube are connected to institute
State between the other end of light-emitting component and described ground wire.
An embodiment according to the disclosure, described energy-storage travelling wave tube is electric capacity.
An embodiment according to the disclosure, described light-emitting component is Organic Light Emitting Diode.
An embodiment according to the disclosure, described switch element is audion.
An embodiment according to the disclosure, also includes the 3rd between described light-emitting component and described power supply
Resistance.
According to the second aspect of the disclosure, a kind of LED emission control circuit, including: driver element,
First switch element, the first resistance, the second resistance, the first power supply, second switch element, the 3rd electricity
Resistance, three terminal regulator, the 3rd switch element, the 4th resistance, light-emitting component, second source, described
Driver element is electrically connected with the control end of described first switch element；One end of described first switch element
Be electrically connected with described second switch element controls end and one end of described second resistance, and the other end is electrical
Connect one end of described first resistance；One end of described second switch element is electrically connected with described 3rd electricity
One end of resistance, described control end and described three ends of the other end described 3rd switch element of electric connection are steady
The input of depressor；One end of described 3rd switch element is electrically connected with described light-emitting component, the other end
It is electrically connected with an outfan and one end of the 4th resistance of described three terminal regulator；Described light-emitting component
The other end is electrically connected with described second source；The other end of described first resistance is electrically connected with described three ends
Another outfan of manostat, the other end of described 4th resistance and ground wire.
An embodiment according to the disclosure, also includes energy-storage travelling wave tube, one end electricity of described energy-storage travelling wave tube
Property connect described light-emitting component the other end, the other end be electrically connected with ground wire.
An embodiment according to the disclosure, described energy-storage travelling wave tube is electric capacity.
An embodiment according to the disclosure, also includes between described light-emitting component and described second source
5th resistance.
An embodiment according to the disclosure, also includes that a thermo-sensitive resistor, described thermo-sensitive resistor are connected in parallel on
Described 4th resistance two ends.
An embodiment according to the disclosure, also includes the 6th resistance and resistor, described 6th resistance
With described resistor in series, being connected in parallel on described 4th resistance two ends, the sliding end of described resistor is electrical
Connect one end of described 4th resistance.
After the LED emission control circuit of the disclosure uses three terminal regulator, it is steady that light projector voltage is three ends
The reference voltage of depressor, the precision of its deviation can improve to ± 1%, and during using, stability is high,
Facilitate field adjustable and management.Utilizing control circuit of the present utility model, the device that can improve circuit is inclined
Difference, makes detection distance reach farther.The reference voltage of three terminal regulator is minimum to variations in temperature, so
Light projector being stablized, even if detecting transparent object, also can accurately judge.Further, three terminal regulator
Price is about the 15% of operational amplifier, can be greatly saved cost.
When being understood by, it is only exemplary, not that above general description and details hereinafter describe
The disclosure can be limited.
Accompanying drawing explanation
Its example embodiment is described in detail, above and other target of the disclosure, spy by referring to accompanying drawing
Levy and advantage will become apparent from.
Figure 1A illustrates correlation type photoelectric sensor.
Figure 1B illustrates retro-reflection optoelectronic sensor.
Fig. 1 C illustrates diffusion reflection pattern photoelectric sensor.
Fig. 2 A illustrates LED emission control circuit schematic diagram of the prior art.
Fig. 2 B illustrates the LED emission control circuit schematic diagram using operational amplifier in prior art.
Fig. 3 illustrates the schematic diagram of the LED emission control circuit according to disclosure example embodiment.
Fig. 4 A illustrates the schematic diagram that in prior art, 4 photoelectric sensors carry out detecting.
Fig. 4 B illustrates disclosure example embodiment and detection distance versus figure of the prior art.
Fig. 4 C illustrates the detection bodies schematic diagram that photoelectric sensor detection variable quantity is less.
Fig. 4 D illustrates the contrast that the output voltage of three terminal regulator varies with temperature with triode ON voltage
Figure.
Fig. 5 A illustrates the LED emission control circuit schematic diagram according to disclosure example embodiment.
Fig. 5 B illustrates the LED emission control circuit schematic diagram according to disclosure example embodiment.
Detailed description of the invention
It is described more fully with example embodiment referring now to accompanying drawing.But, example embodiment energy
Enough implement in a variety of forms, and be not understood as limited to example set forth herein；On the contrary, it is provided that this
A little embodiments make the disclosure will more fully and completely, and by comprehensive for the design of example embodiment
Convey to those skilled in the art.Accompanying drawing is only the schematic illustrations of the disclosure, is not necessarily
Drawn to scale.Reference identical in figure represents same or similar part, thus omission is right
Their repeated description.
Additionally, described feature, structure or characteristic can be combined in one in any suitable manner
Or in more embodiment.In the following description, it is provided that many details thus be given these public affairs
Fully understanding of the embodiment opened.It will be appreciated, however, by one skilled in the art that this can be put into practice
Disclosed technical scheme and omit in described specific detail one or more, or can be used other
Method, constituent element, step etc..In other cases, it is not shown in detail or describes known features, side
Method, realize or operate avoiding that a presumptuous guest usurps the role of the host and each side of the disclosure is thickened.
Some block diagrams shown in accompanying drawing are functional entitys, it is not necessary to must be with the most only
Vertical entity is corresponding.Can use software form to realize these functional entitys, or at one or many
Individual hardware module or integrated circuit realize these functional entitys, or fills at heterogeneous networks and/or processor
Put and/or microcontroller device realizes these functional entitys.
Fig. 3 illustrates the schematic diagram of the LED emission control circuit according to disclosure example embodiment.
As it is shown on figure 3, LED emission control circuit includes: driver element the 301, first resistance 302,
Switch element 303, three terminal regulator 304, light-emitting component the 305, second resistance 306, power supply 307.
Driver element 301 is electrically connected with one end of the first resistance 302；The other end of the first resistance 302
Be electrically connected with switch element 303 controls end and the input of three terminal regulator 304；Switch element 303
One end be electrically connected with one end of light-emitting component 305, the other end is electrically connected with three terminal regulator 304
One outfan and one end of the second resistance 306；The other end of light-emitting component 305 is electrically connected with power supply 307；
Another outfan of three terminal regulator 304 is electrically connected with the other end and the ground wire of the second resistance 306.
Driver element 301 output pulse signal, to the first resistance 302, arrives after the first resistance 302
The control end of switch element 303, carries out open and close controlling to switch element 303.Driver element 301 is defeated
The electric current gone out flows into three terminal regulator 304 through the first resistance 302, and three terminal regulator 304 produces benchmark
Voltage Vref.Power supply 307 is powered for light-emitting component 305.The output electric current Iout_IC of driver element 301
Starting current Ik and the electric current Ib_TR flowing through switch element 303 and controlling end more than three terminal regulator 304
Sum, i.e. Iout_IC ＞ Ik+Ib_TR.Switch element 303 controls the electric current Ib_TR of end and sends out for flowing through
The light projector electric current I_LED of optical element 305 is divided by the amplification coefficient hfe_TR of switch element 303, i.e.
Ib_TR=I_LED/hfe_TR.The starting current Ik of conventional three terminal regulator 304 is 1mA, i.e. when
When the electric current of inflow three terminal regulator 304 is more than 1mA, three terminal regulator 304 can start.
When pulse voltage Vout_IC of driver element 301 output is more than the electric conduction of switch element 303
Pressure Vbe and reference voltage V ref sum, i.e., during Vout_IC ＞ Vref+Vbe, switch element 303 is led
Logical, three terminal regulator 304 produces reference voltage V ref.Now, the light projector of light-emitting component 305 is flowed through
On the basis of peak I peak_LED of electric current, voltage Vref is divided by resistance R2 of the second resistance 306, i.e.
Ipeak_LED=Vref/R2.And on the basis of meansigma methods Iavg_LED of light projector electric current voltage Vref divided by
Resistance R2 of the second resistance 306, then it is multiplied by dutycycle duty of pulse signal, i.e.
Ipeak_LED=Vref/R2*duty, the light projector voltage of light-emitting component 305 is three terminal regulator 304
Reference voltage V ref.
According to an example embodiment, between the other end and ground wire of light-emitting component 305, also include energy storage
Element 308, energy-storage travelling wave tube 308 can use electric capacity, and supplementing for light-emitting component 305 provides driving voltage.
According to an example embodiment, switch element 303 can use audion.
According to an example embodiment, light-emitting component 305 can use Organic Light Emitting Diode.
According to an example embodiment, one can also be arranged between light-emitting component 305 and power supply 307
Three resistance 309.
After the LED emission control circuit of the disclosure uses three terminal regulator 304, light projector voltage is three
Reference voltage V ref of end manostat 304, the precision of its deviation can improve to ± 1%.In the mistake used
In journey, stability is high, facilitates field adjustable and management.Such as, as shown in Figure 4 A, 4 sensings are used
Device detection same workpiece, owing to control circuit of the prior art exists loop big the asking of light projector deviation
Topic, makes light spread of voltage, and for the same threshold set, output has omission detection.To this end,
Need separate unit to debug, different threshold values is set, makes troubles to field management.Use this utility model
Control circuit, be greatly improved light projector precision, make light stable, facilitate client's batch field adjustable and
Simple management.And the price of three terminal regulator 304 is about the 15% of operational amplifier, can significantly save
About cost.
The LED emission control circuit using the disclosure is capable of farther detection distance.Such as, as
Shown in Fig. 4 B, the ability of detection distance is together decided on by optics and electronic device.Because there is device
The deviation of part, including optical manufacturing deviation, the factors such as group founds deviation, the device deviation of circuit, limit
Final detection distance.Utilize control circuit of the present utility model, the device deviation of circuit can be improved,
Detection distance is made to reach farther.
The LED emission control circuit using the disclosure can detect the detection bodies that variable quantity is smaller.Example
As, as shown in Figure 4 C, for special detection body, such as the transparent body, the rate of change of reflection light quantity is the least,
So typically arranging less detection switching range.Due to quick to temperature of the conducting voltage of conductor device
Perception is relatively strong, and change is big, causes light projector current fluctuation big, and fluctuation range will be sent out beyond switching range
Raw misoperation.And reference voltage V ref of three terminal regulator 304 varies with temperature minimum, so can be steady
Determining light projector, even if detecting transparent object, also can accurately judge.As shown in Figure 4 D, for three-terminal voltage-stabilizing
The contrast that reference voltage V ref of device 304 output varies with temperature with common triode ON voltage Vbe
Figure.
Fig. 5 A illustrates the LED emission control circuit schematic diagram according to disclosure example embodiment.
As it is shown in figure 5, LED emission control circuit includes: driver element the 501, first switch element 502,
First resistance the 503, second resistance the 504, first power supply 505, second switch element the 506, the 3rd electricity
Resistance 507, three terminal regulator the 508, the 3rd switch element the 509, the 4th resistance 510, light-emitting component 511,
Second source 512.
Driver element 501 is electrically connected with the control end of the first switch element 502；First switch element 502
One end be electrically connected with second switch element 506 control end and one end of the second resistance 504, another
End is electrically connected with one end of the first resistance 503；One end of second switch element 506 is electrically connected with the 3rd
One end of resistance 507, the other end is electrically connected with control end and the three-terminal voltage-stabilizing of the 3rd switch element 509
The input of device 508；One end of 3rd switch element 509 is electrically connected with light-emitting component 511, the other end
It is electrically connected with an outfan and one end of the 4th resistance 510 of three terminal regulator 508；Light-emitting component 511
The other end be electrically connected with second source 512；The other end of the first resistance 503 is electrically connected with described three ends
Another outfan of manostat 508, the other end of the 4th resistance 510 and ground wire.
When driver element 501 output pulse voltage Vout_IC less than switch element conducting voltage with
During the reference voltage V ref sum of three terminal regulator, LED emission control circuit as shown in Figure 5 can be used.
Driver element 501 output voltage makes the first switch element 502, second switch element 506 open, three ends
The starting current Ik of manostat 508 is supplied by the first power supply 505.The voltage VDD1 of the first power supply 505
More than the reference voltage of three terminal regulator 508, conducting voltage Vbe_TR2 of second switch element 506,
Conducting voltage Vce_TR3 of the 3rd switch element 509 and the 3rd resistance 507 both end voltage VR3 sum,
I.e. VDD1 > Vref+Vbe_TR2+Vce_TR3+VR3.
According to an example embodiment, also include that energy-storage travelling wave tube 513, one end of energy-storage travelling wave tube 513 electrically connect
The other end of sending and receiving optical element 511, the other end is electrically connected with ground wire.Energy-storage travelling wave tube 513 can use
Electric capacity, supplements for light-emitting component 511 and provides driving voltage.
According to an example embodiment, between light-emitting component 511 and second source 512, also include the 5th electricity
Resistance 514.
According to an example embodiment, also including a thermo-sensitive resistor 515, thermo-sensitive resistor 515 is connected in parallel on the 4th
Resistance 510 two ends.The temperature of LED is can compensate at the 4th resistance 510 two ends parallel connection thermo-sensitive resistor 515
Impact, improves light projector precision further.
According to an example embodiment, as shown in Figure 5 B, also include the 6th resistance 516 and resistor 517,
6th resistance 516 is connected with resistor 517, is connected in parallel on the 4th resistance 510 two ends, resistor 517
Sliding end be electrically connected with the 4th resistance 510 one end.Under the regulation of resistor 517, can be to throwing
Photoelectric current is adjusted.
More than it is particularly shown and described the illustrative embodiments of the disclosure.It should be appreciated that
The disclosure is not limited to detailed construction described herein, set-up mode or implementation method；On the contrary, the disclosure
It is intended to contain the various amendments comprised in the spirit and scope of the appended claims and equivalence is arranged.
Claims (10)
1. a LED emission control circuit, it is characterised in that including: driver element, the first resistance,
Switch element, three terminal regulator, light-emitting component, the second resistance, power supply,
Described driver element is electrically connected with one end of described first resistance；
Control end and described three ends of the other end described switch element of electric connection of described first resistance are steady
The input of depressor；
One end of described switch element is electrically connected with one end of described light-emitting component, and the other end is electrically connected with
One outfan of described three terminal regulator and one end of described second resistance；
The other end of described light-emitting component is electrically connected with described power supply；
Another outfan of described three terminal regulator is electrically connected with the other end and the ground wire of described second resistance.
2. LED emission control circuit as claimed in claim 1, it is characterised in that also include energy storage
Element, described energy-storage travelling wave tube is connected between the other end of described light-emitting component and described ground wire.
3. LED emission control circuit as claimed in claim 2, it is characterised in that described energy storage unit
Part is electric capacity.
4. LED emission control circuit as claimed in claim 1, it is characterised in that described luminous unit
Part is Organic Light Emitting Diode.
5. LED emission control circuit as claimed in claim 1, it is characterised in that described switch unit
Part is audion.
6. a LED emission control circuit, it is characterised in that including: driver element, the first switch
Element, the first resistance, the second resistance, the first power supply, second switch element, the 3rd resistance, three ends
Manostat, the 3rd switch element, the 4th resistance, light-emitting component, second source,
Described driver element is electrically connected with the control end of described first switch element；
One end of described first switch element is electrically connected with the control end of described second switch element and described
One end of second resistance, the other end is electrically connected with one end of described first resistance；
One end of described second switch element is electrically connected with one end of described 3rd resistance, and the other end is electrical
Connect described control end and the input of described three terminal regulator of described 3rd switch element；
One end of described 3rd switch element is electrically connected with described light-emitting component, and the other end is electrically connected with institute
State an outfan and one end of the 4th resistance of three terminal regulator；
The other end of described light-emitting component is electrically connected with described second source；
The other end of described first resistance is electrically connected with another outfan of described three terminal regulator, described
The other end of the 4th resistance and ground wire.
7. LED emission control circuit as claimed in claim 6, it is characterised in that also include energy storage
Element, one end of described energy-storage travelling wave tube is electrically connected with the other end of described light-emitting component, and the other end is electrical
Connect ground wire.
8. LED emission control circuit as claimed in claim 7, it is characterised in that described energy storage unit
Part is electric capacity.
LED emission control circuit the most as claimed in claims 6 or 7, it is characterised in that also include
One thermo-sensitive resistor, described thermo-sensitive resistor is connected in parallel on described 4th resistance two ends.
LED emission control circuit the most as claimed in claims 6 or 7, it is characterised in that also wrap
Include the 6th resistance and resistor, described 6th resistance and described resistor in series, be connected in parallel on the described 4th
Resistance two ends, the sliding end of described resistor is electrically connected with one end of described 4th resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620215749.2U CN205648077U (en) | 2016-03-22 | 2016-03-22 | LED sends out light controlling circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620215749.2U CN205648077U (en) | 2016-03-22 | 2016-03-22 | LED sends out light controlling circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205648077U true CN205648077U (en) | 2016-10-12 |
Family
ID=57076603
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620215749.2U Expired - Fee Related CN205648077U (en) | 2016-03-22 | 2016-03-22 | LED sends out light controlling circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205648077U (en) |
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2016
- 2016-03-22 CN CN201620215749.2U patent/CN205648077U/en not_active Expired - Fee Related
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| C14 | Grant of patent or utility model | ||
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Granted publication date: 20161012 |