CN104360291A - Electronic load device for testing LED (Light Emitting Diode) driving power supply and test method thereof - Google Patents
Electronic load device for testing LED (Light Emitting Diode) driving power supply and test method thereof Download PDFInfo
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- CN104360291A CN104360291A CN201410727532.5A CN201410727532A CN104360291A CN 104360291 A CN104360291 A CN 104360291A CN 201410727532 A CN201410727532 A CN 201410727532A CN 104360291 A CN104360291 A CN 104360291A
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Abstract
The invention provides an electronic load device for testing an LED (Light Emitting Diode) driving power supply and a test method thereof; the electronic load device comprises a power consumption unit, a voltage sampling module, a hardware subtracter circuit module and a hardware multiplier module; the hardware subtracter circuit module is respectively connected to the voltage sampling module and the hardware multiplier module, so that output voltage Vrd of the hardware subtracter circuit module is obtained by substracting input voltage Ui by adjustable voltage Vd; the hardware multiplier module is respectively connected to the hardware subtracter circuit module and the power consumption unit, so that output current Icon is obtained by dividing an input voltage Vrd by resistance Rd; the power consumption unit is connected to a to-be-tested LED driving power supply, so that a corresponding current is loaded according to the current Icon given by the hardware multiplier module; the CR-LED mode designed on a pure hardware circuit is realized; computing control of all load is completed by the hardware subtracter circuit module and the hardware multiplier module; the electronic load device disclosed by the invention is rapid in response speed and is capable of simulating LED load characteristics well; furthermore the test method is simple and easy.
Description
Technical field
The present invention relates to a kind of electronic load device for LED drive power test, the invention still further relates to the detection method using this kind of device simultaneously.
Background technology
In recent years, LED illumination product is subject to applying more and more widely, and its " high reliability " becomes the key property of LED product, and the quality of LED drive power directly governs the reliability of LED product.
Prior art LED illumination adopts constant current source driving power usually, the test of LED constant current source adopts the permanent resistance of the CR(of electronic load device) and CV(constant voltage) two kinds of traditional modes carry out, but because LED drive power adopts on-off principle to design mostly, therefore there is larger electric current and voltage ripple, thus make this universal CR and CV pattern be easy to be subject to the interference of high frequency noise, cause the deviation of testing, even cannot test.And from the specificity analysis of LED, there is a forward voltage Vd, and the operating voltage simulating LED is merely able to by electronic load device CV pattern, but forward voltage Vd cannot be simulated, therefore use the CV pattern of electronic load device to test LED drive power, the test result obtained is not accurate enough.
Currently available technology test LED drive power mainly adopts the CR-LED pattern of electronic load device, calculate with pure software to realize analog functuion under this pattern, as shown in Figure 1, AD sampled voltage and electric current are through the CPU processor of electronic load device, then after DA conversion, Current Control is carried out, resistance Rd is drawn by software computing, because software computing completes by the CPU processor of electronic load device entirely, and the CPU processor of electronic load device is participated in the overall process computing, therefore exist and take the slow problem of CPU processor resource, response speed.Namely the LED drive power of electronic load device test at present supports without the hardware-in-the-loop of reality, but got by computing after detection voltage and current, and there is larger high frequency ripple in LED constant current source driving power, therefore the voltage after superposition is real-time change, causes this electronic load device to respond in time.
Summary of the invention
The object of this invention is to provide a kind of electronic load device for LED drive power test, solution electronic load device test LED drive power supports without the hardware-in-the-loop of reality, but the problem by being obtained by the CPU processor calculating of electronic load device after detection voltage and current, and there is larger high frequency ripple in LED drive power, the problem that cannot respond in time causing electronic load device to exist, the present invention simultaneously also provides a kind of method of testing of electronic load device of the present invention.
To achieve these goals; technical scheme of the present invention is: provide a kind of electronic load device for LED drive power test; LED drive power is drawn and carries; this electronic load device arranges and includes power dissipating unit and voltage sample module; described electronic load device also comprises hardware subtraction circuit module and hardware multiplier module; hardware subtraction circuit module connects voltage sample module and hardware multiplier module respectively, makes hardware subtraction circuit module output voltage Vrd be that input voltage Ui deducts adjustable voltage Vd;
Hardware multiplier module connects hardware subtraction circuit module and power dissipating unit successively, makes output current Icon be that input voltage Vrd is divided by resistance Rd;
Power dissipating unit connects LED drive power to be measured, according to the electric current I con load phase induced current that hardware multiplier module is given.
Described hardware subtraction circuit module and hardware multiplier module also receive the output voltage Vd signal that obtains after the CPU processor calculating process of electronic load device of setup parameter and resistance Rd signal respectively.
Described setup parameter comprises quiescent potential Vo, electric current I o and resistance coefficient R_coeff.
Method of testing provided by the invention is as follows: a, electronic load device is switched to CR-LED pattern, according to the output parameter of LED drive power to be measured, the quiescent potential Vo of setting driving power, working point electric current I o, and working ressitance coefficients R _ coeff, the CPU processor of electronic load device starts computing according to formula (1) and formula (2), draw corresponding voltage Vd and resistance Rd, resistance Rd delivers to hardware multiplier module, voltage Vd delivers to hardware subtraction circuit module, afterwards if do not carried out setup parameter adjustment, then the CPU processor of electronic load device no longer participates in computing,
Formula is
Rd=(Vo/Io) * R_coeff formula (1)
Vd=Vo* (1-R_coeff) formula (2)
Wherein: resistance Rd is the intrinsic parameter of LED drive power, and voltage Vd is LED drive power forward voltage;
B, LED drive power output voltage subtract each other through the voltage Vd that the CPU processor of load voltage sampling module output voltage Ui and electronic load device produces and obtain voltage Vrd;
C, voltage Vrd produce the electric current I con control signal driving power consumable unit of corresponding LED drive power through hardware multiplier module.
Band carries and all completes operation control by the hardware circuit comprising hardware subtraction circuit module and hardware multiplier module.
Hardware subtraction circuit module uses Differential Input mode to subtract each other voltage U i and voltage Vd and obtains voltage Vrd, then exports to hardware multiplier module;
Obtain electric current I con through voltage Vrd/ resistance Rd computing after voltage Vrd is input to hardware multiplier module, electric current I con control signal goes driving power consumable unit again.
Hardware subtraction circuit module arithmetic formula is
Vrd=Ui-Vd formula (3)
Hardware multiplier module arithmetic formula is
Icon=(Ui-Vd)/Rd formula (4).
Electric current I con=electric current I o.
The invention has the beneficial effects as follows that electronic load device is based upon the CR-LED pattern in pure hardware circuit design, band carries and all completes operation control by hardware circuit hardware subtraction circuit module and hardware multiplier module, fast response time, well can simulate the constant current source product of the large and PWM light modulation of the load characteristic, particularly output ripple of LED; Method of testing can provide easy setting steps and method simultaneously, for the LED of same type, only needs the rational resistance coefficient R_coeff of setting one, is multiplied by setup parameter voltage Vo and electric current I o and can obtains resistance Rd.
Accompanying drawing explanation
Fig. 1 is the electronic load device theory diagram testing LED drive power in prior art;
Fig. 2 is the electronic load device theory diagram that the present invention tests LED drive power;
Fig. 3 is the circuit theory diagrams of hardware subtraction circuit module of the present invention;
Fig. 4 is the circuit theory diagrams of hardware multiplier module of the present invention.
Embodiment
The preferred embodiments of the present invention are described in detail below in conjunction with accompanying drawing.
Embodiment as shown in Figure 1, Figure 2, Figure 3 and Figure 4, for prior art as Fig. 1, the present embodiment provides a kind of electronic load device for LED drive power test, LED drive power is drawn and carries, comprise power dissipating unit, parameter setting module, voltage sample module, hardware subtraction circuit module and hardware multiplier module, setup parameter quiescent potential Vo, the electric current I o of parameter setting module and resistance coefficient R_coeff obtain output voltage Vd signal and resistance Rd signal after the CPU processor calculating process of electronic load device;
Hardware subtraction circuit module connects voltage sample module and hardware multiplier module respectively, hardware subtraction circuit module receiver voltage Vd signal, hardware multiplier module receives resistance Rd signal, makes hardware subtraction circuit module output voltage Vrd be that input voltage Ui deducts adjustable voltage Vd; Hardware multiplier module connects hardware subtraction circuit module and power dissipating unit successively, makes output current Icon be that input voltage Vrd is divided by resistance Rd; Power dissipating unit connects LED drive power to be measured and hardware multiplier module respectively, according to the electric current I con load phase induced current that hardware multiplier module is given, described phase induced current is that power dissipating unit carries the phase induced current of LED drive power output according to the electric current I con control signal band that hardware multiplier module is given, is power dissipating unit carries LED drive power output phase induced current according to the electric current I con control signal band that hardware multiplier module is given;
The present embodiment hardware multiplier module adopts four-quadrant DAC, and those skilled in the art easily expect that hardware multiplier module digital regulation resistance of also can sampling realizes this function.
The present embodiment also provides a kind of method of testing of above-mentioned electronic load device, 1, electronic load device is switched to CR-LED pattern, according to the output parameter of LED drive power to be measured, the setup parameter quiescent potential Vo of setting driving power, working point electric current I o, and the working ressitance coefficients R _ coeff of acquiescence, the CPU processor of electronic load device starts computing according to formula (1) and formula (2), draw corresponding voltage Vd, resistance Rd, resistance Rd delivers to hardware multiplier module, voltage Vd delivers to hardware subtraction circuit module, afterwards as no longer carried out setup parameter adjustment, then the CPU processor of electronic load device no longer will participate in computing, if operating personnel think that setup parameter needs adjustment, also parameter can be reset,
Electric current I o is working point electric current, should be set to the rated current of tested LED drive power;
Voltage Vo is quiescent potential, and this parameter can set according to the output voltage range of tested LED drive power;
Resistance Rd is the intrinsic parameter of LED drive power, and voltage Vd is LED drive power forward voltage;
Rd=(Vo/Io)* R_coeff； （1）
Vd=Vo*(1-R_coeff)。（2）
2, the power dissipating unit of LED drive power access electronic load device, the voltage Vd that load voltage sampling and outputting voltage Ui and digital circuit produce is subtracted each other by hardware subtraction circuit module and obtains voltage Vrd;
3, voltage Vrd produces the electric current I con control signal driving power consumable module of corresponding LED drive power through hardware multiplier module, band carries and all completes operation control by hardware circuit hardware subtraction circuit module and hardware multiplier module, there is very high response speed, well can simulate the constant current source product of the large and PWM light modulation of the load characteristic, particularly output ripple of LED drive power.
Hardware subtraction circuit module uses Differential Input mode to subtract each other voltage U i and voltage Vd and obtains Vrd and then export to hardware multiplier module;
Obtain electric current I con through voltage Vrd/ resistance Rd computing after voltage Vrd is input to hardware multiplier module, electric current I con control signal goes driving power consumable unit again.
Hardware circuit realizes following calculation function, as formula (3) and formula (4)
Vrd=Ui-Vd （3）
Icon =（Ui-Vd）/ Rd （4）
In theory, if testing setup is suitable, then electric current I con=electric current I o.
Claims (7)
1., for the electronic load device of LED drive power test, draw LED drive power and carry, this electronic load device arranges and includes power dissipating unit and voltage sample module, it is characterized in that: described electronic load device also
Comprise hardware subtraction circuit module and hardware multiplier module, hardware subtraction circuit module connects voltage sample module and hardware multiplier module respectively, makes hardware subtraction circuit module output voltage Vrd be that input voltage Ui deducts adjustable voltage Vd;
Hardware multiplier module connects hardware subtraction circuit module and power dissipating unit successively, makes output current Icon be that input voltage Vrd is divided by resistance Rd;
Power dissipating unit connects LED drive power to be measured, according to the electric current I con load phase induced current that hardware multiplier module is given.
2. the electronic load device for LED drive power test according to claim 1, is characterized in that: described hardware subtraction circuit module and hardware multiplier module also receive the output voltage Vd signal that obtains after the CPU processor calculating process of electronic load device of setup parameter and resistance Rd signal respectively.
3. the electronic load device for LED drive power test according to claim 2, is characterized in that: described setup parameter comprises quiescent potential Vo, electric current I o and resistance coefficient R_coeff.
4. adopt the method for testing of any one electronic load device of claims 1 to 3, it is characterized in that: a, electronic load device is switched to CR-LED pattern, according to the output parameter of LED drive power to be measured, the quiescent potential Vo of setting driving power, working point electric current I o, and working ressitance coefficients R _ coeff, the CPU processor of electronic load device starts computing according to formula (1) and formula (2), draw corresponding voltage Vd and resistance Rd, resistance Rd delivers to hardware multiplier module, voltage Vd delivers to hardware subtraction circuit module, afterwards if do not carried out setup parameter adjustment, then the CPU processor of electronic load device no longer participates in computing,
Formula is
Rd=(Vo/Io) * R_coeff formula (1)
Vd=Vo* (1-R_coeff) formula (2)
Wherein: resistance Rd is the intrinsic parameter of LED drive power, and voltage Vd is LED drive power forward voltage;
B, LED drive power output voltage subtract each other through the voltage Vd that the CPU processor of load voltage sampling module output voltage Ui and electronic load device produces and obtain voltage Vrd;
C, voltage Vrd produce the electric current I con control signal driving power consumable unit of corresponding LED drive power through hardware multiplier module.
5. method of testing according to claim 4, is characterized in that: band carries and all completes operation control by the hardware circuit comprising hardware subtraction circuit module and hardware multiplier module.
6. method of testing according to claim 4, is characterized in that: hardware subtraction circuit module uses Differential Input mode to subtract each other voltage U i and voltage Vd and obtains voltage Vrd, then exports to hardware multiplier module;
Obtain electric current I con through voltage Vrd/ resistance Rd computing after voltage Vrd is input to hardware multiplier module, electric current I con control signal goes driving power consumable unit again;
Hardware subtraction circuit module arithmetic formula is
Vrd=Ui-Vd formula (3)
Hardware multiplier module arithmetic formula is
Icon=(Ui-Vd)/Rd formula (4).
7. the method for testing according to claim 4,5 or 6, is characterized in that: electric current I con=electric current I o.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410727532.5A CN104360291A (en) | 2014-12-04 | 2014-12-04 | Electronic load device for testing LED (Light Emitting Diode) driving power supply and test method thereof |
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| CN201410727532.5A CN104360291A (en) | 2014-12-04 | 2014-12-04 | Electronic load device for testing LED (Light Emitting Diode) driving power supply and test method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107884606A (en) * | 2017-12-15 | 2018-04-06 | 安阳普莱电子照明有限公司 | A kind of electronic load device and the method using electronic load device Test driver |
| CN113311218A (en) * | 2021-05-13 | 2021-08-27 | 苏州美恩斯电子科技有限公司 | Electronic load constant-resistance device and control method thereof |
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| CN101210956A (en) * | 2006-12-29 | 2008-07-02 | 中茂电子(深圳)有限公司 | Electronic load device and its emulation method |
| US20080270090A1 (en) * | 2005-10-07 | 2008-10-30 | Dspace Digital Signal Propcessing And Control- Engineering Gmbh | Method and Device for Simulating an Electrical/Electronic Load |
| CN101324797A (en) * | 2007-06-15 | 2008-12-17 | 中茂电子(深圳)有限公司 | Electronic load device and circuit thereof |
| CN101359038A (en) * | 2007-08-02 | 2009-02-04 | 中茂电子(深圳)有限公司 | Electronic load device capable of simulating LED characteristic and simulation method thereof |
| CN102456776A (en) * | 2010-10-19 | 2012-05-16 | 博计电子股份有限公司 | Electronic load of semiconductor element |
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Patent Citations (6)
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| JPH01100468A (en) * | 1987-10-14 | 1989-04-18 | Hitachi Ltd | Electronic load apparatus |
| US20080270090A1 (en) * | 2005-10-07 | 2008-10-30 | Dspace Digital Signal Propcessing And Control- Engineering Gmbh | Method and Device for Simulating an Electrical/Electronic Load |
| CN101210956A (en) * | 2006-12-29 | 2008-07-02 | 中茂电子(深圳)有限公司 | Electronic load device and its emulation method |
| CN101324797A (en) * | 2007-06-15 | 2008-12-17 | 中茂电子(深圳)有限公司 | Electronic load device and circuit thereof |
| CN101359038A (en) * | 2007-08-02 | 2009-02-04 | 中茂电子(深圳)有限公司 | Electronic load device capable of simulating LED characteristic and simulation method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107884606A (en) * | 2017-12-15 | 2018-04-06 | 安阳普莱电子照明有限公司 | A kind of electronic load device and the method using electronic load device Test driver |
| CN113311218A (en) * | 2021-05-13 | 2021-08-27 | 苏州美恩斯电子科技有限公司 | Electronic load constant-resistance device and control method thereof |
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Application publication date: 20150218 |