CN109541496A - LED drive power life-span prediction method and device - Google Patents
LED drive power life-span prediction method and device Download PDFInfo
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- CN109541496A CN109541496A CN201811249946.6A CN201811249946A CN109541496A CN 109541496 A CN109541496 A CN 109541496A CN 201811249946 A CN201811249946 A CN 201811249946A CN 109541496 A CN109541496 A CN 109541496A
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- led drive
- drive power
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- temperature
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/40—Testing power supplies
- G01R31/42—AC power supplies
Abstract
The present invention provides a kind of LED drive power life-span prediction method and devices, the described method includes: the electrolytic capacitor to LED drive power puts on local oven, apply a preset steady temperature, programmable power supply provides stable voltage to LED drive power, work normally LED drive power, LED drive power connects electronic load, detect the positive pin temperature of electrolytic capacitor and LED drive power output current ripple, when current ripples change rate reaches setting value, LED drive power failure, out-of-service time is characteristics life, replacement LED drive power carries out the test of next temperature, repeatedly repeatedly, match mathematical model, fit corresponding life curve.The present invention can extrapolate the LED drive power service life with less measurement data and simple data model, easily and effectively.
Description
Technical field
The present invention relates to LED drive power technical fields, and in particular to a kind of LED drive power life-span prediction method and one
Kind LED drive power life predication apparatus.
Background technique
LED is developed rapidly as forth generation lighting source with advantages such as its green energy conservation, service life length, extensive
It is illuminated applied to indoor and outdoor and various special occasions.LED lamp is mainly by shell, light source, three part compositions of power supply, phase
For LED light source, the structure of LED drive power is more complicated, investigation discovery, and 90% or more LED light source failure is all
Driving power quality problems.The service life of the LED lamp of present market production is most of only to use the longevity according to luminous component
Life ignores other composition parts, in terms of lacking driving power life-span accelerated test specification and life-span prediction method come what is assessed
Research.
Summary of the invention
The present invention is to solve to lack LED drive power life-span accelerated test specification and life prediction side easily and effectively at present
Method provides a kind of LED drive power life-span prediction method and a kind of LED drive power life predication apparatus.
The technical solution adopted by the invention is as follows:
A kind of LED drive power life-span prediction method, comprising: put on part to the electrolytic capacitor of the LED drive power
Oven, applies a preset steady temperature, and programmable power supply provides stable voltage to the LED drive power, makes the LED
Driving power works normally, and the LED drive power connects electronic load, detects the positive pin temperature of the electrolytic capacitor and described
LED drive power output current ripple, when current ripples change rate reaches setting value, LED drive power failure, when failure
Between be characteristics life, replacement LED drive power carries out the test of next temperature, repeatedly repeatedly, match mathematical model,
Fit corresponding life curve.
Stable voltage is provided for the LED drive power by program-controlled voltage source.
The device for detecting the positive pin temperature of capacitor includes K-type thermocouple, signal conditioning circuit and data collecting card.
The preset steady temperature range is 120 DEG C~180 DEG C, and 250% with output current ripple change rate is LED
Driving power failure criteria.
It is ordinate that the life curve, which is by abscissa, characteristics life of temperature, and multiple temperature and characteristics life point are in
What exponential curve fitting obtained, the service life of LED drive power under normal working temperature is released according to the life curve.
A kind of LED drive power life predication apparatus, comprising: local oven, it is described part oven in temperature it is adjustable, institute
Local oven is stated to be placed on the electrolytic capacitor of the LED drive power；Power supply, the power supply are LED driving
Power supply provides stable voltage；Data acquisition device, the data acquisition device are used to acquire the electrolysis of the LED drive power
The positive pin temperature of capacitor；Host computer, the host computer are connected with the data acquisition device, and the host computer is according to the LED
The temperature display temperature data of the positive pin of the electrolytic capacitor of driving power, and store；Electronic load, the electronic load connect described
The output end of LED drive power；Oscillograph, the oscillograph connect the output end of the LED drive power, and the oscillograph is used for
It acquires and shows driving power output end current ripple.
The power supply is program-controlled voltage source.
The data acquisition device includes K-type thermocouple, signal conditioning circuit and data collecting card.
The preset steady temperature range is 120 DEG C~180 DEG C, and 250% with output current ripple change rate is LED
Driving power failure criteria.
It is ordinate by abscissa, characteristics life of temperature, exponentially curve matching obtains for multiple temperature and characteristics life point
To the life curve of LED drive power, the service life of LED drive power under normal working temperature is released according to the life curve.
Beneficial effects of the present invention:
The present invention drives electricity using the service life of service life shortest electrolytic capacitor in all components of LED drive power as LED
Premised on the service life in source, the environment of electrolytic capacitor hot operation is set, the measurement positive pin temperature of electrolytic capacitor is capacitor core temperature
Degree, reaches setting value as failure criteria using driving power output end current ripple change rate, obtains driving power under some high temperature
Characteristics life, repeated multiple times can obtain the characteristics life under different high temperature, so be fitted obtain LED drive power service life it is bent
Line can release the service life of LED drive power under normal working temperature accordingly, and thereby, it is possible to less measurement data and simply
Data model extrapolate the LED drive power service life, easily and effectively.
Detailed description of the invention
Fig. 1 is the flow chart of the LED drive power life-span prediction method of the embodiment of the present invention；
Fig. 2 is the host computer display interface schematic diagram of one embodiment of the invention；
Fig. 3 is the block diagram of the LED drive power life predication apparatus of the embodiment of the present invention；
Fig. 4 is the block diagram of the LED drive power life predication apparatus of a specific embodiment of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As shown in Figure 1, the LED drive power life-span prediction method step of the embodiment of the present invention are as follows: to LED drive power
Electrolytic capacitor puts on local oven, applies a preset steady temperature, and programmable power supply provides stable electricity to LED drive power
Pressure, works normally LED drive power, and LED drive power connects electronic load, and the positive pin temperature of detection electrolytic capacitor and LED drive
Dynamic electric power outputting current ripple, when current ripples change rate reaches setting value, LED drive power failure, the out-of-service time is spy
It levies the service life, replacement LED drive power carries out the test of next temperature, repeatedly repeatedly, matches mathematical model, fits phase
The life curve answered.Then service life of the LED drive power under normal working temperature can be obtained according to the life curve.
In one embodiment of the invention, preset steady temperature range is 120 DEG C~180 DEG C, i.e., local oven can
120 DEG C~180 DEG C of high-temperature work environment is provided for electrolytic capacitor.
In one embodiment of the invention, stable voltage can be provided for LED drive power by program-controlled voltage source, keep away
Exempt to bring voltage fluctuation because using civilian 220V alternating current.Electronic load is terminated by the output in LED drive power, can be subtracted
Few influence of the light source aging to LED drive power itself.
In one embodiment of the invention, the device for detecting the positive pin temperature of capacitor includes K-type thermocouple, signal condition
Circuit and data collecting card.The patch measurement end of K-type thermocouple may be disposed on electrolytic capacitor；Signal conditioning circuit connects K-type heat
The positive and negative anodes of galvanic couple, signal conditioning circuit provide temperature-compensating and signal amplification for K-type thermocouple；Data collecting card and signal tune
The output end for managing circuit is connected, and data collecting card is for acquiring amplified temperature signal.Can also by with signal conditioning circuit
Connected auxiliary DC power supply provides steady dc voltage for signal conditioning circuit, such as 24V voltage.In a tool of the invention
In body embodiment, data collecting card model USB6008, acquisition analog input end can receive the voltage signal of -10~10V.
It in one embodiment of the invention, can be by host computer according to the positive pin of electrolytic capacitor of LED drive power
Temperature display temperature data, and store.Further, host computer can store shown temperature data every the set time, and
The data of storage are called to generate files and reports.Specifically, host computer can realize display, the storage of temperature data based on LabVIEW
With the generation of files and reports.Furthermore, the LED drive power life-span prediction method of the embodiment of the present invention, is utilized
Software section may include data disaply moudle, data storage module and report generation module.Wherein, data disaply moudle can pass through
The temperature change that curve graph real-time display detects, data storage module can save the temperature data shown every the set time,
Report generation module can call the data of storage by report text control, generate the files and reports of excel format.
Since the data collecting card of a specific embodiment of the invention has 16 channels, sampling channel can be first arranged in host computer,
Reselection acquisition mode is continuous sampling, after host computer receives the signal that each channel of data collecting card is transmitted, see with data and
The form of chart carries out real-time display, and display interface is as shown in Figure 2.
Current ripples change rate may be defined as:
In one embodiment of the invention, it can fail with the 250% of output current ripple change rate for LED drive power
Criterion, i.e., above-mentioned setting value can be 250%.
In one particular embodiment of the present invention, at least two LED drive powers may be selected and carries out life prediction.It can use
The patch measurement end of K-type thermocouple is pasted the positive pin of electrolytic capacitor in driving power by high temperature gummed tape, and K-type thermocouple is just
Cathode connects signal conditioning circuit and carries out cold junction compensation and signal amplification, and signal conditioning circuit output termination data acquisition card will be put
The voltage signal input data capture card of -10~10V is in after big, the input port of data collecting card can be AI0, AI1 etc..
One output of LED drive power terminates electronic load, facilitates and adjusts load testing electric parameter.It is by D.C. regulated power supply
Signal conditioning circuit provides stable 24V voltage, and the settable 220V of programmable power supply provides the exchange of stability criterion for driving power
Power supply.After the completion of above-mentioned necessary connection, local oven is placed on electrolytic capacitor, applies temperature stress, each steady temperature
The positive pin temperature, that is, capacitor DIE Temperature of capacitor is measured, using oscilloscope measurement ripple current, when ripple current change rate is more than
When 250%, electrolytic capacitor failure is LED drive power failure, records the out-of-service time.The LED drive power out-of-service time is LED
The characteristics life of driving power at the corresponding temperature.Then LED drive power is replaced, setting different temperatures continues to be repeated as many times,
Such as 5 times, obtain the corresponding relationship of multiple temperature and characteristics life.Generally, temperature is higher, and LED drive power reaches failure
Time is shorter.The life curve of the embodiment of the present invention can by abscissa, characteristics life of temperature to be ordinate, multiple temperature and
Exponentially curve matching obtains for characteristics life point.In turn, LED under normal working temperature can be released according to life curve drives electricity
The service life in source.
LED drive power life-span prediction method according to an embodiment of the present invention, with the longevity in all components of LED drive power
Premised on service life of shortest electrolytic capacitor is ordered as the service life of LED drive power, the environment of electrolytic capacitor hot operation is set,
The measurement positive pin temperature of electrolytic capacitor is capacitor DIE Temperature, reaches setting value with driving power output end current ripple change rate
For failure criteria, the characteristics life of driving power under some high temperature is obtained, repeated multiple times can obtain the feature longevity under different high temperature
Life, and then be fitted and obtain the life curve of LED drive power, the longevity of LED drive power under normal working temperature can be released accordingly
Life, thereby, it is possible to extrapolate the LED drive power service life with less measurement data and simple data model, easily and effectively, at
This is lower.
The LED drive power life-span prediction method of corresponding above-described embodiment, the present invention also propose a kind of LED drive power longevity
Order prediction meanss.
As shown in figure 3, the LED drive power life predication apparatus of the embodiment of the present invention, including local oven 10, power supply electricity
Source 20, data acquisition device 30, host computer 40, electronic load 50 and oscillograph 60.
Wherein, the temperature in local oven 10 is adjustable, and the part oven 10 is placed in the electrolysis electricity of the LED drive power
Rong Shang；Power supply 20 provides stable voltage for the LED drive power；Data acquisition device 30 is for acquiring the LED
The positive pin temperature of the electrolytic capacitor of driving power；Host computer 40 is connected with the data acquisition device 30, the host computer 40
According to the temperature display temperature data of the positive pin of the electrolytic capacitor of the LED drive power, and store；Electronic load 50 connects described
The output end of LED drive power；Oscillograph 60 connects the output end of the LED drive power, and the oscillograph 60 is for acquiring simultaneously
Show driving power output end current ripple.
In one embodiment of the invention, preset steady temperature range is 120 DEG C~180 DEG C, i.e., local oven can
120 DEG C~180 DEG C of high-temperature work environment is provided for electrolytic capacitor.
In one embodiment of the invention, it as shown in figure 4, power supply 20 can be program-controlled voltage source, avoids because using
Civilian 220V alternating current and bring voltage fluctuation.Electronic load 50 is terminated by the output in LED drive power, light source can be reduced
Influence of aging to LED drive power itself.
In one embodiment of the invention, as shown in figure 4, data acquisition device 30 includes K-type thermocouple, signal condition
Circuit and data collecting card.The patch measurement end of K-type thermocouple may be disposed on electrolytic capacitor；Signal conditioning circuit connects K-type heat
The positive and negative anodes of galvanic couple, signal conditioning circuit provide temperature-compensating and signal amplification for K-type thermocouple；Data collecting card and signal tune
The output end for managing circuit is connected, and data collecting card is for acquiring amplified temperature signal.Can also by with signal conditioning circuit
Connected auxiliary DC power supply provides steady dc voltage for signal conditioning circuit, such as 24V voltage.In a tool of the invention
In body embodiment, data collecting card model USB6008, acquisition analog input end can receive the voltage signal of -10~10V.
In one embodiment of the invention, host computer 40 can store shown temperature data every the set time, and
The data of storage are called to generate files and reports.Specifically, host computer 40 can be realized the display of temperature data based on LabVIEW, be deposited
The generation of storage and files and reports.Furthermore, the LED drive power life-span prediction method of the embodiment of the present invention, is utilized
Software section may include data disaply moudle, data storage module and report generation module.Wherein, data disaply moudle can lead to
The temperature change that curve graph real-time display detects is crossed, data storage module can save the temperature number shown every the set time
According to report generation module can call the data of storage by report text control, generate the files and reports of excel format.
Since the data collecting card of a specific embodiment of the invention has 16 channels, sampling channel can be first arranged in host computer,
Reselection acquisition mode is continuous sampling, after host computer receives the signal that each channel of data collecting card is transmitted, see with data and
The form of chart carries out real-time display, and display interface is as shown in Figure 2.
Current ripples change rate may be defined as:
In one embodiment of the invention, it can fail with the 250% of output current ripple change rate for LED drive power
Criterion, i.e., above-mentioned setting value can be 250%.
Based on above-mentioned LED drive power life predication apparatus, in one particular embodiment of the present invention, may be selected at least
Two LED drive powers carry out life prediction.The patch measurement end of K-type thermocouple can be pasted into driving power with high temperature gummed tape
The positive pin of middle electrolytic capacitor, the positive and negative anodes of K-type thermocouple connect signal conditioning circuit and carry out cold junction compensation and signal amplification, signal
Conditioning circuit output termination data acquisition card, will be in the voltage signal input data capture card of -10~10V, data after amplification
The input port of capture card can be AI0, AI1 etc..One output of LED drive power terminates electronic load, and adjusting is facilitated to load
Detecting electric parameter.Stable 24V voltage is provided for signal conditioning circuit by D.C. regulated power supply, programmable power supply is settable
220V provides the AC power source of stability criterion for driving power.After the completion of above-mentioned necessary connection, local oven is placed in electrolysis
On capacitor, apply temperature stress, each steady temperature is measured the positive pin temperature, that is, capacitor DIE Temperature of capacitor, surveyed using oscillograph
Ripple current is measured, when ripple current change rate is more than 250%, electrolytic capacitor failure is LED drive power failure, record failure
Time.The LED drive power out-of-service time is the characteristics life of LED drive power at the corresponding temperature.Then replacement LED driving
Power supply, setting different temperatures continue to be repeated as many times, such as 5 times, obtain the corresponding relationship of multiple temperature and characteristics life.Generally
Ground, temperature is higher, and it is shorter that LED drive power reaches the out-of-service time.It is horizontal that the life curve of the embodiment of the present invention, which can be with temperature,
Coordinate, characteristics life be ordinate, and exponentially curve matching obtains for multiple temperature and characteristics life point.It in turn, can be according to the longevity
Order the service life that curve releases LED drive power under normal working temperature.
LED drive power life predication apparatus according to an embodiment of the present invention, with the longevity in all components of LED drive power
Premised on service life of shortest electrolytic capacitor is ordered as the service life of LED drive power, passing through local oven, to provide electrolytic capacitor high
The environment of temperature work, measuring the positive pin temperature of electrolytic capacitor by data acquisition device is capacitor DIE Temperature, with driving power
It is failure criteria that output end current ripple change rate, which reaches setting value, obtains the characteristics life of driving power under some high temperature, can
It is repeated multiple times to obtain the characteristics life under different high temperature, and then be fitted and obtain the life curve of LED drive power, it can release accordingly
In the service life of LED drive power under normal working temperature, thereby, it is possible to less measurement data and the reckoning of simple data model
The LED drive power service life out, easily and effectively.
In the description of the present invention, the meaning of " plurality " is two or more, unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected；It can be directly connected, can also can be in two elements indirectly connected through an intermediary
The interaction relationship of the connection in portion or two elements.It for the ordinary skill in the art, can be according to specific feelings
Condition understands the concrete meaning of above-mentioned term in the present invention.
In the present invention unless specifically defined or limited otherwise, fisrt feature in the second feature " on " or " down " can be with
It is that the first and second features directly contact or the first and second features pass through intermediary mediate contact.Moreover, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature be directly above or diagonally above the second feature, or be merely representative of
First feature horizontal height is higher than second feature.Fisrt feature can be under the second feature " below ", " below " and " below "
One feature is directly under or diagonally below the second feature, or is merely representative of first feature horizontal height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
It can be combined in any suitable manner in one or more embodiment or examples.In addition, without conflicting with each other, the skill of this field
Art personnel can tie the feature of different embodiments or examples described in this specification and different embodiments or examples
It closes and combines.
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
A variety of variations, modification, replacement can be carried out to these embodiments without departing from the principles and spirit of the present invention by understanding
And modification, the scope of the present invention is defined by the appended.
Claims (10)
1. a kind of LED drive power life-span prediction method characterized by comprising
Local oven is put on to the electrolytic capacitor of the LED drive power, applies a preset steady temperature, programmable power supply is given
The LED drive power provides stable voltage, works normally the LED drive power, and the LED drive power connects electronics
Load, detects the positive pin temperature of the electrolytic capacitor and the LED drive power output current ripple, current ripples change rate reaches
When to setting value, the LED drive power failure, the out-of-service time is characteristics life, and replacement LED drive power carries out next
The test of temperature matches mathematical model, fits corresponding life curve repeatedly repeatedly.
2. LED drive power life-span prediction method according to claim 1, which is characterized in that be by program-controlled voltage source
The LED drive power provides stable voltage.
3. LED drive power life-span prediction method according to claim 1, which is characterized in that the detection positive pin temperature of capacitor
The device of degree includes K-type thermocouple, signal conditioning circuit and data collecting card.
4. LED drive power life-span prediction method according to claim 1, which is characterized in that the preset constant temperature
Spending range is 120 DEG C~180 DEG C, with the 250% of output current ripple change rate for LED drive power failure criteria.
5. LED drive power life-span prediction method according to claim 1, which is characterized in that the life curve be with
Temperature is abscissa, characteristics life is ordinate, and exponentially curve matching obtains for multiple temperature and characteristics life point, according to institute
State the service life that life curve releases LED drive power under normal working temperature.
6. a kind of LED drive power life predication apparatus characterized by comprising
Local oven, it is described part oven in temperature it is adjustable, it is described part oven be placed in the LED drive power electrolysis electricity
Rong Shang；
Power supply, the power supply provide stable voltage for the LED drive power；
Data acquisition device, the data acquisition device are used to acquire the positive pin temperature of electrolytic capacitor of the LED drive power；
Host computer, the host computer are connected with the data acquisition device, and the host computer is according to the electricity of the LED drive power
The temperature display temperature data of the positive pin of capacitor is solved, and is stored；
Electronic load, the electronic load connect the output end of the LED drive power；
Oscillograph, the oscillograph connect the output end of the LED drive power, and the oscillograph is for acquiring and showing driving electricity
Source output terminal current ripples.
7. LED drive power life predication apparatus according to claim 6, which is characterized in that the power supply is journey
Control voltage source.
8. LED drive power life predication apparatus according to claim 6, which is characterized in that the data acquisition device
Including K-type thermocouple, signal conditioning circuit and data collecting card.
9. LED drive power life predication apparatus according to claim 6, which is characterized in that the preset constant temperature
Spending range is 120 DEG C~180 DEG C, with the 250% of output current ripple change rate for LED drive power failure criteria.
10. LED drive power life predication apparatus according to claim 9, which is characterized in that using temperature as abscissa,
Characteristics life is ordinate, and exponentially curve matching obtains the life curve of LED drive power for multiple temperature and characteristics life point,
The service life of LED drive power under normal working temperature is released according to the life curve.
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| CN201811249946.6A CN109541496A (en) | 2018-10-25 | 2018-10-25 | LED drive power life-span prediction method and device |
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|---|---|---|---|---|
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| CN106465517A (en) * | 2014-08-20 | 2017-02-22 | 俞尚佑 | Led driving device |
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| CN101087125A (en) * | 2007-06-25 | 2007-12-12 | 中国科学院电工研究所 | An electromotor drive system of electromotive motorcar with life prediction function |
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Application publication date: 20190329 |