CN221039225U - High-precision current detection for LED light bar detection - Google Patents
High-precision current detection for LED light bar detection Download PDFInfo
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- CN221039225U CN221039225U CN202322765064.8U CN202322765064U CN221039225U CN 221039225 U CN221039225 U CN 221039225U CN 202322765064 U CN202322765064 U CN 202322765064U CN 221039225 U CN221039225 U CN 221039225U
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- 238000001514 detection method Methods 0.000 title claims abstract description 27
- 238000012545 processing Methods 0.000 claims abstract description 27
- 238000005070 sampling Methods 0.000 claims abstract description 14
- 238000005259 measurement Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012795 verification Methods 0.000 description 2
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Abstract
The utility model relates to the field of electronic measurement, in particular to high-precision current detection for detecting an LED lamp strip, which comprises the following steps: voltage output module, operational amplifier: the output end of the voltage output module is connected to the feedback loop of the operational amplifier, and the central control circuit: the central control circuit comprises a MOS tube and a sampling resistor, wherein the MOS tube comprises a D pole, an S pole and a G pole for controlling a D-S pole current value, the G pole of the MOS tube is connected with an operational amplifier, the S pole of the MOS tube is connected with the sampling resistor, the sampling resistor is a precise resistor, and the voltage and current measuring module: the voltage and current measuring module is connected with the precision resistor and is used for detecting the voltage value in the precision resistor, and the processing module is used for: the processing module is used for controlling the voltage output module and the current-voltage measuring module, and has the advantages of controlling the value of the driving current with high precision, adjusting the variation precision of the driving current and reducing the detection cost through the technical scheme.
Description
Technical Field
The utility model belongs to the technical field of electronic measurement, and particularly relates to high-precision current detection for LED lamp strip detection.
Background
As the technology of LCD/LED/MiniLED is continuously and iteratively developed and upgraded, the detection requirement on related products is higher and higher, and the miniaturization of the LED device leads to smaller and smaller driving current required by the products, but more accurate control current is required;
In the prior art, an automatic detection device for an LED light bar is unstable in parameter test of a product, so that driving current is greatly fluctuated, the driving current cannot be constant within a specified range for a long time, the driving current can be changed along with the change of a load, and the driving current is controlled within a range of 2-5 milliamperes;
Because the instability of the driving current input leads to larger errors in the parameter detection of the equipment on products, the control precision of the driving current is usually carried out within the range of 10 microamps, the control precision of 10 microamps cannot carry out high-precision voltage and current measurement, and in the testing process of the front edge technology, technicians only consume a large amount of money to purchase high-precision LED lamp strip detection equipment from abroad in order to carry out high-precision detection and control on the driving current, so that the cost is increased.
Disclosure of utility model
In order to solve the problems in the related art, the application provides high-precision current detection for detecting the LED light bar, and solves the problems that the existing detection equipment cannot control the value of the driving current with high precision, adjust the variation precision of the driving current and have high cost.
The technical proposal is as follows:
High accuracy is detected with electric current to LED lamp strip detects, includes:
a voltage output module;
an operational amplifier: connecting the output end of the voltage output module to a feedback loop of the operational amplifier;
The central control circuit: the central control circuit comprises an MOS tube and a sampling resistor, the MOS tube comprises a D pole, an S pole and a G pole for controlling the current value of the D-S pole, the G pole of the MOS tube is connected with the operational amplifier, the S pole of the MOS tube is connected with the sampling resistor, and the sampling resistor is a precision resistor;
The voltage and current measuring module is used for: the voltage and current measuring module is connected with the precision resistor and is used for detecting the voltage value in the precision resistor;
The processing module is used for: the processing module is used for controlling the voltage output module and the current and voltage measuring module.
According to the technical scheme, the processing module controls the output voltage value of the voltage output module, the output voltage is amplified by the operational amplifier and then is output to the central control circuit, and the processing module controls the voltage and current measuring module to measure the voltage of the central control circuit, so that the driving current value is obtained, and a closed-loop control system based on the processing module is realized;
After the operational amplifier receives the output voltage value, the G pole of the MOS tube is connected with the operational amplifier and can be used as a control end of the MOS tube, the voltage value of the G pole on the MOS tube can be controlled by adjusting the voltage of the operational amplifier, the conduction degree of D-S on the MOS tube is further controlled, the S pole of the MOS tube is connected with the precision resistor, the voltage current measuring module measures the current of the precision resistor, the typical minimum current can reach 5 microamps, the extreme minimum current is 1 microampere, the error range of the control precision of the driving current is ensured to be 0.01 microampere, and the driving current output is accurately controlled; in addition, through changing the resistance value of the sampling resistor, the driving current in different ranges can be obtained, and further, greater flexibility and controllability are provided, so that the circuit design is more accurate and adapts to different application requirements, and a technician does not need to spend a great cost from the imported high-precision automatic detection equipment abroad.
Further, an inspection system for inspecting the measurement results is provided in the processing module.
Through the technical scheme, the inspection system is arranged in the processing module through software programming, the measurement result can be inspected through a reliable measuring instrument, if the difference value between the driving current and the actually required driving current exceeds the original error range, the processing module adjusts the voltage value of the voltage output module, and at the moment, the driving current can slightly change until the difference value between the driving current and the actually required driving current is within the error, so that the purpose of accurate control is realized.
Further, the processing module is an MCU, and the MCU is an SMT32 singlechip; the voltage output module is a DAC, and the DAC is a 24-bit DAC chip; the voltage and current measurement module is an ADC, and the ADC is a 16-bit ADC chip; when the MCU is provided with the DAC and the ADC, the DAC and the ADC are not additionally connected; when there are no DAC and ADC in MCU, DAC and ADC are connected additionally.
Through the technical scheme, the most suitable scheme of the processing module, the voltage output module and the voltage and current measuring module can be selected according to the requirements of specific applications, so that various different application scenes are met.
In summary, the beneficial effects of the utility model are as follows:
1. The high-precision DAC voltage output and ADC voltage current measurement are adopted, and closed-loop management is realized by matching with an MCU, so that the typical minimum current reaches 5 microamps, the extreme minimum current is 1 microamps, the error range of the control precision of the driving current is ensured to be 0.01 microamps, and the driving current of the output is accurately controlled; in addition, after the high-precision voltage and current detection is realized, the imported high-precision detection equipment from abroad is not needed, so that the cost is reduced;
2. In the measurement part, the test result which is very accurate originally is more accurate due to the existence of a verification system in the MCU, so that the actual application requirement can be completely met;
3. According to the requirements of specific applications, the most suitable scheme of the processing module, the voltage output module and the voltage and current measuring module is selected, so that various different application scenes are met.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the utility model as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.
Fig. 1 is a schematic diagram of high-precision current detection for detecting an LED light bar.
Detailed Description
Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the utility model. Rather, they are merely examples of apparatus and methods consistent with aspects of the utility model as detailed in the accompanying claims.
In one possible embodiment, as shown in fig. 1, the high-precision current detection for detecting the LED light bar includes:
a voltage output module;
an operational amplifier: connecting the output end of the voltage output module to a feedback loop of the operational amplifier;
The central control circuit: the central control circuit comprises an MOS tube and a sampling resistor, the MOS tube comprises a D pole, an S pole and a G pole for controlling the current value of the D-S pole, the G pole of the MOS tube is connected with the operational amplifier, the S pole of the MOS tube is connected with the sampling resistor, and the sampling resistor is a precision resistor;
The voltage and current measuring module is used for: the voltage and current measuring module is connected with the precision resistor and is used for detecting the voltage value in the precision resistor;
The processing module is used for: the processing module is used for controlling the voltage output module and the current and voltage measuring module;
The voltage output module, the operational amplifier, the voltage and current measuring module and the processing module are all connected with a power supply, the power supply is provided by current, the processing module controls the output voltage value of the voltage output module, the output voltage is amplified by the operational amplifier and then is output to the G pole of the MOS tube in the central control circuit, the processing module controls the voltage and current measuring module to measure the voltage of the central control circuit so as to obtain a driving current value, a closed-loop control system based on the processing module is realized, the G pole of the MOS tube is connected with the non-inverting input end of the operational amplifier and can be used as the control end of the MOS tube, the voltage value of the G pole on the MOS tube can be controlled by adjusting the voltage of the non-inverting input end of the operational amplifier, the conduction degree of D-S on the MOS tube is further controlled, the S pole of the MOS tube is connected with a precision resistor, the voltage and current measuring module measures a very accurate driving current, the typical minimum current can reach 5 microamps, the extreme minimum current is 1 microamps, the error range of the control precision of the driving current is 0.01 microamps, the driving current which is accurately controlled and output is realized, the driving current in different ranges can be obtained by changing the resistance value of the sampling resistor, further, the greater flexibility and the controllability are provided, the circuit design is more accurate and suitable for different application requirements, the inspection system is arranged in the processing module through software programming, the measuring result can be verified through a reliable measuring instrument, if the difference value between the driving current and the actually required driving current exceeds the original error range, the processing module adjusts the voltage value of the voltage output module, and the driving current can slightly change at the moment, the method is characterized in that the method is used for adjusting the difference value between the driving current and the actually required driving current to be within the error, so that the purpose of accurate control is realized, the output driving current can be controlled at the level of 0.01uA, the output driving current is quite accurate, the originally very accurate test result is more accurate due to the existence of a verification system, the actual application requirement can be completely met, and further, high-precision automatic detection equipment imported from foreign countries is not needed, and the cost is saved;
The processing module is MCU, MCU is SMT32 singlechip, voltage output module is the DAC, the DAC is 24 bit DAC chip, voltage current measurement module is ADC, ADC is 16 bit ADC chip, MCU can control the start and stop of ADC and DAC, when MCU is from having DAC and ADC, just need not extra DAC and ADC to connect, direct use from DAC and ADC of taking can, and the operation is more convenient, when MCU does not have DAC and ADC in, extra ADC and DAC to with ADC and DAC all with MCU wireless connection, make MCU can control ADC and DAC, the customer can select most suitable processing module according to the demand of specific application, voltage output module and voltage current measurement module scheme, thereby satisfy various different application scenarios.
Other embodiments of the utility model will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the utility model and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the utility model being indicated by the following claims.
It is to be understood that the utility model is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the utility model is limited only by the appended claims.
Claims (6)
- The high accuracy of LED lamp strip detects with electric current detection, its characterized in that includes:a voltage output module;an operational amplifier: connecting the output end of the voltage output module to a feedback loop of the operational amplifier;The central control circuit: the central control circuit comprises an MOS tube and a sampling resistor, the MOS tube comprises a D pole, an S pole and a G pole for controlling the current value of the D-S pole, the G pole of the MOS tube is connected with the operational amplifier, the S pole of the MOS tube is connected with the sampling resistor, and the sampling resistor is a precision resistor;The voltage and current measuring module is used for: the voltage and current measuring module is connected with the precision resistor and is used for detecting the voltage value in the precision resistor;The processing module is used for: the processing module is used for controlling the voltage output module and the current and voltage measuring module.
- 2. The high-precision current detection for detecting an LED light bar according to claim 1, wherein a checking system for checking the measurement result is provided in the processing module.
- 3. The high-precision current detection for detecting the LED light bar according to claim 1, wherein the processing module is an MCU, and the MCU is an SMT32 single-chip microcomputer.
- 4. The high-precision current detection for detecting an LED light bar according to claim 3, wherein the voltage output module is a DAC, and the DAC is a 24-bit DAC chip.
- 5. The high-precision current detection for detecting an LED light bar according to claim 4, wherein the voltage and current measurement module is an ADC, and the ADC is a 16-bit ADC chip.
- 6. The high-precision current detection for detecting an LED light bar according to claim 5, wherein when the MCU is provided with the DAC and the ADC, the DAC and the ADC are not additionally connected; when there are no DAC and ADC in MCU, DAC and ADC are connected additionally.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322765064.8U CN221039225U (en) | 2023-10-16 | 2023-10-16 | High-precision current detection for LED light bar detection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322765064.8U CN221039225U (en) | 2023-10-16 | 2023-10-16 | High-precision current detection for LED light bar detection |
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| Publication Number | Publication Date |
|---|---|
| CN221039225U true CN221039225U (en) | 2024-05-28 |
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| CN202322765064.8U Active CN221039225U (en) | 2023-10-16 | 2023-10-16 | High-precision current detection for LED light bar detection |
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| Country | Link |
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| CN (1) | CN221039225U (en) |
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2023
- 2023-10-16 CN CN202322765064.8U patent/CN221039225U/en active Active
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