CN208076025U - Measuring light power module in a kind of LED heat analysis experimental system - Google Patents
Measuring light power module in a kind of LED heat analysis experimental system Download PDFInfo
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- CN208076025U CN208076025U CN201820594384.8U CN201820594384U CN208076025U CN 208076025 U CN208076025 U CN 208076025U CN 201820594384 U CN201820594384 U CN 201820594384U CN 208076025 U CN208076025 U CN 208076025U
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- led
- optics cavity
- power module
- photodiode
- experimental system
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Abstract
The utility model discloses measuring light power module in LED heat analysis experimental system, the radiator of one side position with pores including lighttight optics cavity and mounted on the optics cavity, the pedestal of the radiator is directed toward in optics cavity, the surface of the pedestal is equipped with the LED being welded on PCB, it is opposite with the LED, photodiode is installed on the opposite flank of the optics cavity, the current input terminal of the electrode connection logarithmic amplifying circuit of the photodiode, the input terminal of the voltage output end connection A/D conversion modules of the logarithmic amplifying circuit, the A/D conversion modules connect MCU controllers, the MCU controllers connect computer.The utility model can get the luminous power numerical value under LED different working conditions.
Description
Technical field
The utility model is related to LED heat analysis experimental technique fields, and in particular to light in a kind of LED heat analysis experimental system
Power measurement module.
Background technology
Great power LED by specular removal, the long-life, green energy conservation, quick response, it is compact-sized the advantages that, by conduct
Energy-conserving light source of new generation and widely popularize the fields such as illumination, decoration and display.In LED practical applications, Output optical power
Size be not only to judge the important indicator of electro-optical efficiency and degree of power conservation, and since LED is very sensitive to temperature,
When carrying out thermal resistance measurement and heat dissipation performance analysis to it, it is also necessary to while variation tendency of the luminous power with LED temperature is measured, and
The concrete numerical value of LED thermal powers (thermal power is equal to the difference of electrical power and luminous power) under different working condition.Therefore, light work(
Rate is one of the basic parameter that LED product is used for performance evaluation in the links such as research and development, manufacture and quality inspection.
In the actual production and performance study of LED, luminous power can accurately be measured by integrating sphere equipment, but integrating sphere is simultaneously
It is unable to the thermal data of synchro measure LED.If luminous power is measured with thermal data in distinct device respectively, will certainly cause
Light, electricity, thermal parameter cannot be consistent in measuring condition, and it is this it is inconsistent also lead to generate in thermal analysis it is larger
Error.In addition, integrating sphere equipment lacks temperature regulating device, LED can be made quick temperature occur at initial stage of lighting and risen, and integrated
The measuring speed of ball is slower, can not accurately acquire the true luminous power numerical value at a certain moment.Furthermore integrating sphere equipment belongs to essence
Close detecting instrument, price is higher, and special messenger is needed to operate, and is not suitable for student experimenting teaching and uses.
Utility model content
The purpose of this utility model is to be directed to technological deficiency existing in the prior art, and provide a kind of at low cost, structure
Measuring light power module in simple and easy to use LED heat analysis experimental system.
Technical solution is used by realize the purpose of this utility model：
Measuring light power module in a kind of LED heat analysis experimental system, including lighttight optics cavity and it is mounted on institute
The radiator of the one side position with pores of optics cavity is stated, the pedestal of the radiator is directed toward in optics cavity, the table of the pedestal
Face is equipped with the LED being welded on PCB, opposite with the LED, and two pole of photoelectricity is equipped on the opposite flank of the optics cavity
Pipe, the current input terminal of the electrode connection logarithmic amplifying circuit of the photodiode, the voltage of the logarithmic amplifying circuit are defeated
Outlet connects the input terminal of A/D conversion modules, and the A/D conversion modules connect MCU controllers, the MCU controllers connection meter
Calculation machine.
The optics cavity includes head cover, and the inner wall of the optics cavity and head cover is pasted with lighttight black Flocked fabric.
The pedestal of the radiator is connect with pinboard with screw, and the pinboard is mounted on the outer surface of optics cavity,
The surface of the pinboard is formed with hole corresponding with the one side trepanning of the optics cavity, so that the luminous energy of the LED light is straight
Line is transmitted to the photodiode.
The photodiode is inserted on the side wall of optics cavity, and the electrode of the photodiode stretches out the optics
Outside chamber.
The photodiode is PIN type photodiode.
The MCU controllers use STM32F103 chips.
The optics cavity is rectangular-shaped chamber.
The utility model is capable of the optical signal of Quick Acquisition LED by photodiode, and output current signal is put to logarithm
After big circuit, it is amplified output voltage analog signal through logarithmic amplifying circuit, and voltage digital is converted into through A/D conversion modules
Signal is output to MCU controllers, and transmit voltage digital signal to computer store, then by necessary data processing after,
It can be obtained the luminous power numerical value under LED different working conditions.
Description of the drawings
Fig. 1 is the schematic diagram of measuring light power module in LED heat analysis experimental system；
Fig. 2 is the appearance schematic diagram for the optics cavity for being equipped with radiator, LED and photodiode；
Fig. 3 is the diagrammatic cross-section for the optics cavity for being equipped with radiator, LED and photodiode；
Fig. 4 is the decomposition explosion schematic diagram for the optics cavity for being equipped with radiator, LED and photodiode；
Fig. 5 is the circuit diagram of logarithmic amplifying circuit；
In figure：1 optics cavity, 2 optics cavity head covers, 3 radiators, 4-1LED, 4-2PCB, 5 photodiodes, 6 photoelectricity, two pole
Pipe electrode, 7 pinboards, the fastening screw of 8-1LED and radiator, the fastening screw of 8-2 radiators and pinboard, 8-3 pinboards
With the fastening screw of optics cavity, 9LED drives the fairlead of electric wire.
Specific implementation mode
The utility model is described in further detail below in conjunction with the drawings and specific embodiments.It should be appreciated that this place
The specific embodiment of description is only used to explain the utility model, is not used to limit the utility model.
Referring to shown in Fig. 1-5, measuring light power module in a kind of LED heat analysis experimental system, including：
Lighttight optics cavity 1 and one side (being as shown in Figs. 1-3 left side) trepanning mounted on the optics cavity 1
The pedestal of radiator 3 at position, the radiator is directed toward in optics cavity, and the surface of the pedestal, which is equipped with, is welded on PCB4-2
On LED4-1, it is opposite with the LED, photodiode 5, the photoelectricity two are installed on the opposite flank of the optics cavity
The electrode 6 of pole pipe connects the current input terminal of logarithmic amplifying circuit, and the voltage output end connection A/D of the logarithmic amplifying circuit turns
The input terminal of block is changed the mold, the A/D conversion modules connect MCU controllers, and the MCU controllers connect computer.
The optics cavity of the module can provide radiating subassembly for LED, and can exclude when optical signal is acquired by photodiode
Light interference problem exports reliable current signal, and then is converted into voltage signal by subsequent logarithmic amplifying circuit.The voltage
Signal is under the timing controlled of MCU controllers, by A/D module processings at digital signal, and be uploaded in real time computer into
Row processing.
The operation principle of LED light power measurement module is as shown in Figure 1, after LED is lit work, and optical signal is without outer
In the optics cavity of the reflection interference of boundary's light interference and light extraction itself, current signal is received and is changed by photodiode, the electricity
Stream signal is converted into voltage signal using logarithmic amplifying circuit.Operator can pass through the start-stop of computer settings measuring light power
The parameters such as time and sampling interval make MCU in accordance with the electricity of setup parameter control A/D converter acquisition logarithmic amplifying circuit output
Signal is pressed, and is processed into digital signal, digital signal is transferred to computer by MCU controllers through serial ports again, finally by computer
Data processing is completed, and measurement result is showed into operator.
Wherein, the MCU controllers use STM32F103 chips, and A/D conversion modules can be in the control of MCU controllers
Under, the voltage analog signal that logarithmic amplifying circuit exports is converted into digital signal, MCU controllers are transmitted to, after sampling
The voltage digital signal that A/D is converted to is uploaded to by computer storage processing by communication serial port by MCU controllers.Due to
LED the initial stage of lighting Wen Sheng quickly, in order to capture optical power change data under rapid warm raising in time, can be set on computer
Can be that MCU sets the parameters such as sampling time interval, overall sampling time.After each sampling, MCU controllers can all pass through
The voltage digital signal that A/D is converted to is uploaded to computer storage by serial ports, then utilizes the digital voltage signal number of storage
According to by calculating the optical power value that can obtain LED under different working condition accordingly.
Wherein, the inner wall of the optics cavity 1 and head cover 2 pastes lighttight black Flocked fabric, and head cover 2 is conveniently removed,
To facilitate the installation of each parts.When mounted, LED 4-1 are welded on PCB 4-2 first, and weld driving electric wire,
The base-plates surface of radiator 3 is installed in by two fastening screw 8-1 again；It secondly, will by four fastening screw 8-2
Pinboard 7 is mounted on the base-plates surface of radiator 3；Then, then by four fastening screw 8-3, pinboard 7 is mounted on optics
The outer surface of the left side wall of chamber 1, and LED driving electric wires are connect by fairlead 9 with extraneous power supply；Photodiode 5 is inserted
Mounted in the right side wall of optics cavity, LED is made to be in positive relative position, photodiode electrode 6 in optics cavity with photodiode
It is connected with the input terminal of logarithmic amplifying circuit.
The photodiode is a kind of optoelectronic sensor converting optical signals into current signal, output current
There are specific proportional relations for value and the luminous power size of measured light, therefore the output current for passing through sense photodiode
Value, you can after the output current value of photodiode, the luminous power size of measured light LED is obtained by calculating.
The photodiode that can be used for visible optical detection at present mainly has PN types, PIN type and avalanche-type.The wherein sound of PN types
It answers speed too low, is unsatisfactory for the Quick Acquisition requirement of LED light power；Though avalanche-type response speed is quickly, there is significant times
Synergy is answered, and is easily generated high current under the illumination of great power LED and is burned out；PIN type photodiode has moderate sound
Speed and output current are answered, and the temperature stability of running parameter is preferable, meets requirements of type selecting.
In photodiode current signal to the conversion link of voltage signal, the utility model uses special offer photoelectricity
The AD8304 chips of diode interface.The Weak current of photodiode can be amplified and turned according to logarithm ratio by the AD8304 chips
Formation voltage signal, this logarithmic amplifier mode can obtain prodigious dynamic range, can improve the signal of low resolution
Acquisition precision, and chip interior is integrated with temperature-compensation circuit can reduce temperature drift influence, improve the conversion accuracy of signal and steady
Fixed degree.The logarithmic amplifying circuit as shown in figure 5, logarithmic amplifying circuit input current IPD(the i.e. output electricity of photodiode
Stream) and output voltage VoutBetween follow following relationship：
In formula, IZFor the cut-off current of photodiode, after photodiode is selected, which is constant；K and C
It is constant, concrete numerical value is determined by the resistor network of the peripheries chip AD8304.
As shown in figure 5, the logarithmic amplifying circuit includes AD8304 chips, 1 foot, 2 feet, 14 feet of the AD8304 chips
Ground connection, 3 feet, 5 feet connect one end of capacitance C2 jointly, and the other end ground connection of capacitance C2,4 feet and 6 feet distinguish photodiode
Both ends, and 6 feet are connect with one end of capacitance C3, the other end of another termination capacitor C2 of capacitance C3,4 feet are with capacitance C1's
One end connects, and the other end of the capacitance C1 is grounded after a resistance R1, and 13 feet of AD8304 chips divide two-way, connect electricity all the way
Hindering R2 one end, resistance R2 other ends ground connection, another kind connects the one end capacitance C5, and the capacitance C5 other ends distinguish two-way, and one
Road connects 8 feet of chip, and the other end of one end of another way connecting resistance R3, the resistance R3 divides two-way, meets capacitance C4 all the way,
The capacitance C4 other ends ground connection, 9 feet of another termination AD8304 chips, 10 feet, 12 feet of AD8304 chips connect and are followed by VCC
The output end of voltage, VCC voltage output ends also meet capacitance C8, C12 in parallel, the other end ground connection of capacitance C8, C12, AD8304
11 feet of chip are amplification voltage output foot.
As can be seen that the utility model is capable of the optical signal of Quick Acquisition LED, output current signal by photodiode
To after logarithmic amplifying circuit, it is amplified output voltage analog signal through logarithmic amplifying circuit, and be converted into through A/D conversion modules
Voltage digital signal is output to MCU controllers, and transmits voltage digital signal and stored to computer, then passes through necessary data
After processing, you can obtain the luminous power numerical value under LED different working conditions.
The above is only the preferred embodiment of the utility model, it is noted that for the general of the art
For logical technical staff, without departing from the principle of this utility model, several improvements and modifications can also be made, these change
The scope of protection of the utility model is also should be regarded as into retouching.
Claims (7)
1. measuring light power module in a kind of LED heat analysis experimental system, which is characterized in that including lighttight optics cavity and
Mounted on the radiator of the one side position with pores of the optics cavity, the pedestal of the radiator is directed toward in optics cavity, described
The surface of pedestal is equipped with the LED being welded on PCB, opposite with the LED, is equipped on the opposite flank of the optics cavity
Photodiode, the current input terminal of the electrode connection logarithmic amplifying circuit of the photodiode, the logarithmic amplifying circuit
Voltage output end connection A/D conversion modules input terminal, the A/D conversion modules connect MCU controllers, the MCU controls
Device connects computer.
2. measuring light power module in LED heat analysis experimental system according to claim 1, which is characterized in that the optics
Chamber includes head cover, and the inner wall of the optics cavity and head cover is pasted with lighttight black Flocked fabric.
3. measuring light power module in LED heat analysis experimental system according to claim 1, which is characterized in that the heat dissipation
The pedestal of device is connect with pinboard with screw, and the pinboard is mounted on the outer surface of optics cavity, the surface of the pinboard
Be formed with hole corresponding with the one side trepanning of the optics cavity, so as to the LED light luminous energy linear transmission to the photoelectricity
Diode.
4. measuring light power module in LED heat analysis experimental system according to claim 1, which is characterized in that the light
Electric diode is inserted on the side wall of optics cavity, and the electrode of the photodiode stretches out outside the optics cavity.
5. measuring light power module in LED heat analysis experimental system according to claim 1, which is characterized in that the photoelectricity
Diode is PIN type photodiode.
6. measuring light power module in LED heat analysis experimental system according to claim 1, which is characterized in that the MCU controls
Device processed uses STM32F103 chips.
7. measuring light power module in LED heat analysis experimental system according to claim 1, which is characterized in that the light
Chamber is rectangular-shaped chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820594384.8U CN208076025U (en) | 2018-04-25 | 2018-04-25 | Measuring light power module in a kind of LED heat analysis experimental system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820594384.8U CN208076025U (en) | 2018-04-25 | 2018-04-25 | Measuring light power module in a kind of LED heat analysis experimental system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208076025U true CN208076025U (en) | 2018-11-09 |
Family
ID=64044592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820594384.8U Expired - Fee Related CN208076025U (en) | 2018-04-25 | 2018-04-25 | Measuring light power module in a kind of LED heat analysis experimental system |
Country Status (1)
| Country | Link |
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| CN (1) | CN208076025U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110911955A (en) * | 2019-12-09 | 2020-03-24 | 深圳市杰普特光电股份有限公司 | Laser power monitoring system and control method |
-
2018
- 2018-04-25 CN CN201820594384.8U patent/CN208076025U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110911955A (en) * | 2019-12-09 | 2020-03-24 | 深圳市杰普特光电股份有限公司 | Laser power monitoring system and control method |
| CN110911955B (en) * | 2019-12-09 | 2021-07-30 | 深圳市杰普特光电股份有限公司 | Laser power monitoring system and control method |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20181109 Termination date: 20200425 |
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| CF01 | Termination of patent right due to non-payment of annual fee |