CN209402796U - A kind of LED drive control circuit for image collecting device supplementary lighting sources - Google Patents
A kind of LED drive control circuit for image collecting device supplementary lighting sources Download PDFInfo
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- CN209402796U CN209402796U CN201822173797.1U CN201822173797U CN209402796U CN 209402796 U CN209402796 U CN 209402796U CN 201822173797 U CN201822173797 U CN 201822173797U CN 209402796 U CN209402796 U CN 209402796U
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Abstract
The utility model discloses a kind of LED drive control circuits for image collecting device supplementary lighting sources, including transistor Q1, transistor Q2 and metal-oxide-semiconductor Q3, the base stage of transistor Q1 passes through the external driving control signal interface of resistance R1, the base stage of transistor Q1 also passes through resistance R2 and is connected to the ground, the collector of transistor Q1 is connected by resistance R4 with control voltage Vgd, the emitter of transistor Q1 is connected to the ground, the collector of transistor Q1 also passes through resistance R5 and is connected with the base stage of transistor Q2, and the emitter of transistor Q2 is connected with control voltage Vgd.The utility model will not generate amplification to the interference signal of input terminal parasitism, Phototube Coupling need not be used, to which circuit is simple, it is low in cost, it is low in energy consumption to be convenient for batch production, suitable for the industrial environment of textile defect detection, good light filling effect can be provided to image collecting device, had a good application prospect.
Description
Technical field
The utility model relates to electronic circuit detection technique fields, and in particular to one kind is used for image collecting device light filling light
The LED drive control circuit in source.
Background technique
Traditional textile defect detection relies primarily on artificial progress, less to use automatic detection means.With science
The fault automatic detection of the rapid advances of technology, textile is also developed rapidly.Currently, the fault of existing textile
Automatic detection in terms of digital image acquisition, it is main using the micro-lens of industrial camera or integrated single-chip sensor into
Row photoelectric conversion, usually not for the dedicated technical measures of the improvement use of digital image acquisition environment due to Image Acquisition ring
The bad problem in border, causes the precision of digital picture and reduction degree lower, therefore requires to greatly improve to image recognition technology,
Recognition confidence is difficult to reach industrial scale applications standard, not can guarantee the accuracy of textile defect detection.
Current textile defect detection image capturing system, there are no good supplementary lighting sources, cannot improve image and adopt
Collect environment.With the superperformance of LED light in illumination applications, existing supplementary lighting sources are essentially all to be carried out using LED light
Light filling.But existing LED control circuit, needed between driving circuit and control circuit using photoelectrical coupler carry out every
From, and switching tube is driven using grid-driving integrated circuit, will lead to entire LED control circuit, and volume is larger, and circuit is more multiple
Miscellaneous, cost of manufacture is higher, and power consumption is high and failure rate is higher, causes Image Acquisition sampling bad, can not provide good light filling ring
Border, and be not easy to be widely used to promote.
Utility model content
The purpose of the utility model is to overcome the existing LED control circuit for image collecting device supplementary lighting sources, electricity
Road is more complex, and cost of manufacture is higher, power consumption height and the higher problem of failure rate.The utility model is mended for image collecting device
The LED drive control circuit of radiant, will not to the interference signal of input terminal parasitism generate amplification, it is not necessary to using photoelectricity every
From, so that circuit is simple, and it is low in cost, it is low in energy consumption convenient for batch production, suitable for the industrial environment of textile defect detection, energy
It is enough to provide good light filling effect to image collecting device, it has a good application prospect.
In order to achieve the above object, the technical scheme adopted by the utility model is
A kind of LED drive control circuit for image collecting device supplementary lighting sources, including transistor Q1, transistor Q2 and
The base stage of metal-oxide-semiconductor Q3, the transistor Q1 are by the external driving control signal interface of resistance R1, and the base stage of the transistor Q1 is also
It is connected to the ground by resistance R2, the collector of the transistor Q1 is connected by resistance R4 with control voltage Vgd, the crystalline substance
The emitter of body pipe Q1 is connected to the ground, and the collector of the transistor Q1 also passes through resistance R5 and is connected with the base stage of transistor Q2
It connects, the emitter of the transistor Q2 is connected with control voltage Vgd, and the collector of the transistor Q2 is respectively with resistance R4's
One end, metal-oxide-semiconductor Q3 grid be connected, the other end of the resistance R4 is connected to the ground, the source electrode and LED of the metal-oxide-semiconductor Q3
The anode of lamp bar D1 is connected, and the cathode of the LED light bar D1 is connected to the ground, the drain electrode of the metal-oxide-semiconductor Q3 and supply voltage
Vd is connected.
It is previously described for the LED drive control circuit of image collecting device supplementary lighting sources, the control voltage Vgd, which is higher than, to be supplied
Piezoelectric voltage Vd.
It is previously described for the LED drive control circuit of image collecting device supplementary lighting sources, the control voltage Vgd is 17V,
The supply voltage Vd is 15V, and the logic high of the driving control signal interface is 3.3V.
It is previously described for the LED drive control circuit of image collecting device supplementary lighting sources, the transistor Q1 is that NPN type is brilliant
Body pipe, the transistor Q2 are PNP transistor, and the metal-oxide-semiconductor Q3 is that N links up metal-oxide-semiconductor.
It is previously described for the LED drive control circuit of image collecting device supplementary lighting sources, the model of the transistor Q1
The model BC807, the model FR120N of the transistor Q3 of BC817, the transistor Q2.
It is previously described for the LED drive control circuit of image collecting device supplementary lighting sources, the resistance value of the resistance R1 is 1K
The resistance value of Ω, the resistance R2 are that the resistance value that the resistance value of 100 K Ω, the resistance R3 is 20 K Ω, the resistance R4 is 1.2K
The resistance value of Ω, the resistance R5 are 20 K Ω.
It is previously described for the LED drive control circuit of image collecting device supplementary lighting sources, the power of the LED light bar D1 is
5W。
The beneficial effects of the utility model are: the LED for image collecting device supplementary lighting sources of the utility model drives
Control circuit, transistor Q1 and Q2 work are source follower circuit in switch state, metal-oxide-semiconductor Q3, and gain is less than 1, therefore, will not be right
The interference signal of input terminal parasitism generates amplification, it is not necessary to Phototube Coupling is used, so that circuit is simple, low in cost, power consumption
It is low to provide good benefit to image collecting device suitable for the industrial environment of textile defect detection convenient for batch production
Light effect has a good application prospect.
Detailed description of the invention
Fig. 1 is the circuit diagram of the LED drive control circuit for image collecting device supplementary lighting sources of the utility model.
Specific embodiment
Below in conjunction with Figure of description, the utility model is further described.
As shown in Figure 1, the LED drive control circuit for image collecting device supplementary lighting sources of the utility model, including
The base stage of transistor Q1, transistor Q2 and metal-oxide-semiconductor Q3, the transistor Q1 pass through the external driving control signal interface of resistance R1,
The base stage of the transistor Q1 also passes through resistance R2 and is connected to the ground, and the collector of the transistor Q1 passes through resistance R4 and control
Voltage Vgd is connected, and the emitter of the transistor Q1 is connected to the ground, and the collector of the transistor Q1 also passes through resistance R5
It is connected with the base stage of transistor Q2, the emitter of the transistor Q2 is connected with control voltage Vgd, the transistor Q2's
Collector is connected with the grid of one end of resistance R4, metal-oxide-semiconductor Q3 respectively, and the other end of the resistance R4 is connected to the ground, institute
The source electrode for stating metal-oxide-semiconductor Q3 is connected with the anode of LED light bar D1, and the cathode of the LED light bar D1 is connected to the ground, the MOS
The drain electrode of pipe Q3 is connected with supply voltage Vd.
Preferably, the control voltage Vgd is higher than supply voltage Vd, and the control voltage Vgd is 17V, the power supply electricity
Pressure Vd is 15V, and the logic high of the driving control signal interface is 3.3V.
Preferably, the transistor Q1 is NPN transistor, and the transistor Q2 is PNP transistor, the metal-oxide-semiconductor
Q3 is that N links up metal-oxide-semiconductor.
Preferably, the model BC807 of the model BC817, the transistor Q2 of the transistor Q1, the transistor
The model FR120N of Q3.
Preferably, the resistance value of the resistance R1 is 1K Ω, and the resistance value of the resistance R2 is 100 K Ω, the resistance R3's
The resistance value that resistance value is 20 K Ω, the resistance R4 is 1.2K Ω, and the resistance value of the resistance R5 is 20 K Ω.
Preferably, the power of the LED light bar D1 is that 5W can be realized energy-saving and environment-friendly mesh while meeting light filling
's.
The LED drive control circuit for image collecting device supplementary lighting sources of the utility model, working principle is as follows, drives
Dynamic control signaling interface input logic high level drives transistor Q1 to saturated mode, and resistance R3 is made to generate voltage drop, the lower end R3
Level drives transistor Q2 to saturated mode, and resistance R4 is made to generate voltage, and for driving metal-oxide-semiconductor Q3 grid, being allowed to conducting is LED
Lamp bar D1 provides electric current, since in switch state, metal-oxide-semiconductor Q3 is source follower circuit for transistor Q1 and Q2 work in this circuit, increases
Benefit less than 1, so this circuit will not to the interference signal of input terminal parasitism generate amplification, therefore need not use photoelectricity every
From the gate driving circuit that transistor Q1 and Q2 are constituted is controlled voltage Vgd voltage and is higher than Vd using independently-powered, for producing
Raw gate drive voltage, opens LED drive circuit, LED light bar D1 is lighted, and entire circuit is simple, low in cost and low in energy consumption
Industrial environment convenient for batch production, suitable for textile defect detection.
In conclusion the LED drive control circuit for image collecting device supplementary lighting sources of the utility model, transistor
Q1 and Q2 work is source follower circuit in switch state, metal-oxide-semiconductor Q3, and gain is less than 1, therefore, will not do to input terminal parasitism
It disturbs signal and generates amplification, it is not necessary to Phototube Coupling is used, so that circuit is simple, and it is low in cost, it is low in energy consumption convenient for producing in batches,
Suitable for the industrial environment of textile defect detection, good light filling effect can be provided to image collecting device, had good
Application prospect.
The basic principles and main features and advantage of the utility model have been shown and described above.The technical staff of the industry
It should be appreciated that the present utility model is not limited to the above embodiments, the above embodiments and description only describe this
The principle of utility model, on the premise of not departing from the spirit and scope of the utility model, the utility model also has various change
And improvement, these various changes and improvements fall within the scope of the claimed invention.The utility model requires protection scope
It is defined by the appending claims and its equivalent thereof.
Claims (7)
1. a kind of LED drive control circuit for image collecting device supplementary lighting sources, it is characterised in that: including transistor Q1,
The base stage of transistor Q2 and metal-oxide-semiconductor Q3, the transistor Q1 pass through the external driving control signal interface of resistance R1, the transistor
The base stage of Q1 also passes through resistance R2 and is connected to the ground, and the collector of the transistor Q1 passes through resistance R4 and control voltage Vgd phase
Connection, the emitter of the transistor Q1 are connected to the ground, and the collector of the transistor Q1 also passes through resistance R5 and transistor
The base stage of Q2 is connected, and the emitter of the transistor Q2 is connected with control voltage Vgd, the collector point of the transistor Q2
It is not connected with the grid of one end of resistance R4, metal-oxide-semiconductor Q3, the other end of the resistance R4 is connected to the ground, the metal-oxide-semiconductor Q3
Source electrode be connected with the anode of LED light bar D1, the cathode of the LED light bar D1 is connected to the ground, the drain electrode of the metal-oxide-semiconductor Q3
It is connected with supply voltage Vd.
2. the LED drive control circuit according to claim 1 for image collecting device supplementary lighting sources, feature exist
In: the control voltage Vgd is higher than supply voltage Vd.
3. the LED drive control circuit according to claim 2 for image collecting device supplementary lighting sources, feature exist
In: the control voltage Vgd is 17V, and the supply voltage Vd is 15V, the logic high of the driving control signal interface
For 3.3V.
4. the LED drive control circuit according to claim 1 for image collecting device supplementary lighting sources, feature exist
In: the transistor Q1 is NPN transistor, and the transistor Q2 is PNP transistor, and the metal-oxide-semiconductor Q3 is that N links up MOS
Pipe.
5. the LED drive control circuit according to claim 4 for image collecting device supplementary lighting sources, feature exist
In: the model BC807 of the model BC817, the transistor Q2 of the transistor Q1, the model of the transistor Q3
FR120N。
6. the LED drive control circuit according to claim 1 for image collecting device supplementary lighting sources, feature exist
In: the resistance value of the resistance R1 is 1K Ω, and the resistance value that the resistance value of the resistance R2 is 100 K Ω, the resistance R3 is 20 K Ω,
The resistance value of the resistance R4 is 1.2K Ω, and the resistance value of the resistance R5 is 20 K Ω.
7. the LED drive control circuit according to claim 1 for image collecting device supplementary lighting sources, feature exist
In: the power of the LED light bar D1 is 5W.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822173797.1U CN209402796U (en) | 2018-12-24 | 2018-12-24 | A kind of LED drive control circuit for image collecting device supplementary lighting sources |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822173797.1U CN209402796U (en) | 2018-12-24 | 2018-12-24 | A kind of LED drive control circuit for image collecting device supplementary lighting sources |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209402796U true CN209402796U (en) | 2019-09-17 |
Family
ID=67895952
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822173797.1U Active CN209402796U (en) | 2018-12-24 | 2018-12-24 | A kind of LED drive control circuit for image collecting device supplementary lighting sources |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209402796U (en) |
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2018
- 2018-12-24 CN CN201822173797.1U patent/CN209402796U/en active Active
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