CN219999637U - Point light source control circuit and point light source system - Google Patents
Point light source control circuit and point light source system Download PDFInfo
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- CN219999637U CN219999637U CN202321569446.7U CN202321569446U CN219999637U CN 219999637 U CN219999637 U CN 219999637U CN 202321569446 U CN202321569446 U CN 202321569446U CN 219999637 U CN219999637 U CN 219999637U
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- point light
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- 238000005070 sampling Methods 0.000 claims description 14
- 230000005611 electricity Effects 0.000 abstract description 2
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005286 illumination Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model provides a point light source control circuit and a point light source system, wherein the point light source control circuit comprises: binding post is provided with first wiring port, second wiring port, first wiring port passes through first circuit ground connection, second wiring port connection power, first wiring port and second wiring port are connected with the pointolite electricity, binding post still includes the third wiring port, the third wiring port passes through second circuit ground connection be provided with identification resistance on the second circuit, identification resistance's resistance corresponds with pointolite rated power. By the control circuit, the controller can identify the rated power of the point light source, and can correspondingly control according to the rated power without configuring a specific controller for each point light source control circuit.
Description
Technical Field
The utility model relates to the field of machine vision light sources, in particular to a point light source control circuit and a point light source system.
Background
In the machine vision illumination light source, a point light source has small light emitting area, high brightness and small volume, and a single LED lamp bead is usually adopted as the light emitting source. Since LEDs are current-driven devices and LEDs produced by different manufacturers have different factory voltages, a constant current source is generally used in the market to drive the LEDs as a point light source.
However, because the rated currents of the point light sources with different powers are different, drivers corresponding to the output currents are often needed to be matched with the light sources with different rated currents, the flexibility is low, the cost is high, and if the constant-current controllers which do not accord with the power of the light sources are used by mistake, the phenomena of overheat and even burnout of the light sources are easily caused, and the risk is very high.
Disclosure of Invention
The utility model mainly aims to provide a point light source control circuit and a point light source system, and an external controller can identify rated power of a point light source by arranging an identification resistor, so that the universal external controller can conveniently and correspondingly control according to the rated power.
In order to achieve the above purpose, the utility model adopts the following technical scheme: a point light source control circuit, comprising:
the wiring terminal is provided with a first wiring port and a second wiring port, the first wiring port is grounded through a first circuit, the second wiring port is connected with a power supply, the first wiring port and the second wiring port are electrically connected with the point light source,
the wiring terminal further comprises a third wiring port, the third wiring port is grounded through a second circuit, an identification resistor is arranged on the second circuit, and the resistance value of the identification resistor corresponds to the rated power of the point light source.
Preferably, the constant current control circuit comprises an operational amplifier U3B, MOS pipe Q1, an input positive electrode of the operational amplifier U3B is electrically connected with the controller, the MOS pipe Q1 is arranged on a first line, the MOS pipe Q1 is an N-type MOS pipe, a G electrode of the MOS pipe Q1 is electrically connected with an output end of the operational amplifier U3B, an S electrode of the MOS pipe Q1 is grounded through the first line, a D electrode of the MOS pipe Q1 is electrically connected with a first wiring port through the first line, a sampling resistor R17 is arranged at a part of the first line connected with the S electrode of the MOS pipe Q1, and a part of the first line between the MOS pipe Q1 and the sampling resistor R17 is electrically connected with an input negative electrode of the operational amplifier U3B through a third line.
Preferably, the over-current protection circuit further comprises an triode Q3, the triode Q3 is NPN, a collector of the triode Q3 is connected to a G pole of the MOS tube Q1, an emitter is grounded, a base is electrically connected with the controller, the controller can acquire the voltage of the sampling resistor R17, and the controller can control the on or off of the triode Q3 according to the voltage of the sampling resistor R17.
The utility model also provides a light source system which is characterized by comprising the light source control circuit, the light source and the controller, wherein the controller can detect the light source.
Compared with the prior art, the utility model has the following beneficial effects:
the control circuit is provided with the identification resistor, the resistance value of the identification resistor corresponds to the rated power of the point light source, and when the control circuit works, the controller firstly supplies power to the identification resistor, and the resistance value of the identification resistor is obtained through voltage and current, so that the rated power of the point light source can be obtained, and the controller controls the output of the point light source according to the obtained rated power.
Drawings
Fig. 1 is a circuit diagram according to a preferred embodiment of the present utility model.
Description of the embodiments
The following description is presented to enable one of ordinary skill in the art to make and use the utility model. The preferred embodiments in the following description are by way of example only and other obvious variations will occur to those skilled in the art.
As shown in fig. 1, a point light source control circuit includes binding post P1, identification resistance R1, and binding post P1 is connected with the point light source electricity, still is provided with first wiring port 1, second wiring port 2, third wiring port 3 on the binding post P1, first wiring port 1 passes through first circuit ground connection, and the anodal of 5V power is connected to second wiring port 2, and third wiring port 3 passes through the second circuit ground connection, identification resistance R1 sets up on the second circuit, identification resistance R1's resistance size corresponds with the rated power of point light source, can judge the rated power of point light source according to identification resistance R1's resistance size. The correspondence between the identification resistor R1 and the rated power of the point light source is determined manually in advance, and can be set to a standard unified in industry. In use, the third wiring port 3 is also electrically connected to the controller.
The point light source control circuit further comprises a constant current control circuit, the constant current control circuit comprises an operational amplifier U3B, MOS pipe Q1., an input positive electrode of the operational amplifier U3B is electrically connected with the controller, a MOS pipe Q1 is arranged on a first line, the MOS pipe Q1 is an N-type MOS pipe, a G electrode of the MOS pipe Q1 is electrically connected with an output end of the operational amplifier U3B, an S electrode of the MOS pipe Q1 is grounded through the first line, a D electrode of the MOS pipe Q1 is electrically connected with a first wiring port 1 through the first line, a sampling resistor R17 is arranged at a part, connected with the S electrode of the MOS pipe Q1, of the first line, and a part, located between the MOS pipe Q1 and the sampling resistor R17, is electrically connected with an input negative electrode of the operational amplifier U3B through a third line. The controller can control the voltage of the input positive electrode of the operational amplifier U3B, the operational amplifier U3B can control the output of the operational amplifier U3B by comparing the voltage of the input positive electrode with the voltage of the output negative electrode, when the operational amplifier U3B outputs, the MOS tube Q1 can be conducted, the power supply circuit of the point light source is conducted at the moment, and the point light source is lighted. When the operational amplifier U3B does not output, the MOS tube Q1 is disconnected, and at the moment, the power supply circuit of the point light source is disconnected, and the point light source is closed. In short, when the voltage on the sampling resistor R17 is larger, the voltage on the input cathode of the operational amplifier U3B is larger than the voltage on the input anode, the operational amplifier U3B stops outputting, the MOS transistor Q1 is turned off, the power supply circuit is turned off, the voltage on the sampling resistor R17 is 0 at this time, the voltage on the input cathode of the operational amplifier U3B is smaller than the voltage on the input anode, the output end of the operational amplifier U3B outputs again, the MOS transistor Q1 is turned on again, and the current on the point light source can be maintained at a required current value repeatedly.
When the controller works, firstly, voltage is output to the third wiring port 3, current passing through the identification resistor R1 is detected, the resistance value of the identification resistor R1 is finally determined, the rated power of the point light source is determined according to the resistance value, and the controller controls the voltage output to the input positive electrode of the operational amplifier U3B according to the rated power of the light source so as to avoid exceeding the rated power.
Preferably, the point light source control circuit further includes an overcurrent protection circuit, the overcurrent protection circuit includes a triode Q3, the triode Q3 is NPN type, a collector of the triode Q3 is connected to a G pole of the MOS tube Q1, an emitter is grounded, a base is electrically connected with the controller, and the controller can obtain a voltage of the sampling resistor R17, when the voltage of the sampling resistor R17 exceeds a predetermined value, the controller outputs a voltage to the base of the triode Q3, the triode Q3 is turned on, and then the voltage of the G pole of the MOS tube Q1 is pulled down, the MOS tube Q1 is turned off, and a power supply circuit of the point light source is turned off, so that an overcurrent protection effect is achieved.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made therein without departing from the spirit and scope of the utility model, which is defined by the appended claims. The scope of the utility model is defined by the appended claims and equivalents thereof.
Claims (4)
1. A point light source control circuit, comprising:
the wiring terminal is provided with a first wiring port and a second wiring port, the first wiring port is grounded through a first circuit, the second wiring port is connected with a power supply, the first wiring port and the second wiring port are electrically connected with the point light source,
the wiring terminal further comprises a third wiring port, the third wiring port is grounded through a second circuit, an identification resistor is arranged on the second circuit, and the resistance value of the identification resistor corresponds to the rated power of the point light source.
2. The point light source control circuit according to claim 1, further comprising a constant current control circuit, wherein the constant current control circuit comprises an operational amplifier U3B, MOS pipe Q1, an input positive electrode of the operational amplifier U3B is electrically connected with the controller, the MOS pipe Q1 is arranged on a first circuit, the MOS pipe Q1 is an N-type MOS pipe, a G electrode of the MOS pipe Q1 is electrically connected with an output end of the operational amplifier U3B, an S electrode of the MOS pipe Q1 is grounded through the first circuit, a D electrode of the MOS pipe Q1 is electrically connected with a first wiring port through the first circuit, a sampling resistor R17 is arranged at a portion, connected with the S electrode of the MOS pipe Q1, of the first circuit, and a portion, located between the MOS pipe Q1 and the sampling resistor R17, is electrically connected with an input negative electrode of the operational amplifier U3B through a third circuit.
3. The point light source control circuit according to claim 2, further comprising an overcurrent protection circuit, wherein the overcurrent protection circuit comprises a triode Q3, the triode Q3 is NPN type, a collector of the triode Q3 is connected to a G pole of the MOS transistor Q1, an emitter is grounded, a base is electrically connected to a controller, the controller can obtain a voltage of the sampling resistor R17, and the controller can control on or off of the triode Q3 according to the voltage of the sampling resistor R17.
4. A point light source system comprising the point light source control circuit of any one of claims 1-3, the point light source, and the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321569446.7U CN219999637U (en) | 2023-06-20 | 2023-06-20 | Point light source control circuit and point light source system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321569446.7U CN219999637U (en) | 2023-06-20 | 2023-06-20 | Point light source control circuit and point light source system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219999637U true CN219999637U (en) | 2023-11-10 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321569446.7U Active CN219999637U (en) | 2023-06-20 | 2023-06-20 | Point light source control circuit and point light source system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219999637U (en) |
-
2023
- 2023-06-20 CN CN202321569446.7U patent/CN219999637U/en active Active
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