CN103747587B - A kind of LED lamp radiator temperature online adaptation control circuit - Google Patents
A kind of LED lamp radiator temperature online adaptation control circuit Download PDFInfo
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- CN103747587B CN103747587B CN201410018278.1A CN201410018278A CN103747587B CN 103747587 B CN103747587 B CN 103747587B CN 201410018278 A CN201410018278 A CN 201410018278A CN 103747587 B CN103747587 B CN 103747587B
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- 230000006978 adaptation Effects 0.000 title claims abstract description 10
- 230000000630 rising effect Effects 0.000 claims abstract description 9
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 230000017525 heat dissipation Effects 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims description 7
- 230000001174 ascending effect Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 11
- 230000003044 adaptive effect Effects 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
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Abstract
The invention discloses a kind of LED lamp radiator temperature online adaptation control circuit and method, it is according to LED lamp heat sink currency and rate of change thereof, online adaptive adjustment LED input power, and the slippage of the radiator dissipation capabilities that the rising because of ambient temperature is caused is suitable with the slippage of input power; No matter the change of ambient temperature, the temperature on radiator all can reach balance in prescribed limit, avoids high temperature failure LED component, thus improves the reliability of LED in hot environment.This adaptation control circuit and method are particularly suitable for the larger occasion of variation of ambient temperature; Use a small amount of hardware because this technology only uses, execution mode is simple, is convenient to promote; And compared with art methods, improve reliability, reduce cost, expand the scope of application.
Description
Technical field
The present invention relates to a kind of LED lamp radiator temperature online adaptation control circuit, particularly can maintain the occasion of the temperature online adaptive control that LED normally works in ambient temperature sharply rising situation.
Background technology
Very greatly, winter may below minus 20 degrees, and summer is then up to more than 60 degree in the operating ambient temperature change of LED lamp, particularly LED street lamp; The larger temperature difference brings trouble to heat dissipation design.If by most high ambient temperature design, such that the weight of LED increases, cost rises, is also the bottleneck that this green illumination product is introduced to the market; Otherwise the integrity problem worked under remaining on high ambient conditions is difficult to solve.
At present, the approach solving this problem mainly contains two classes; One class is optimized design and development to the structure of radiator, improves the radiating condition of LED lamp, but after product approval, then can not carry out self-adaptative adjustment to the change of operational environment and condition of work.Another kind of mode is the method monitored radiator temperature in running and control, and is also the focus of research at present.Fairly simple method is the method for overheated power-off protection; namely in LED lamp heat sink, a temperature sensor is installed; when detecting that the temperature of radiator exceedes threshold limit value; hardware circuit then by being connected with this temperature sensor turns off LED driver; cut off the electricity supply, in order to avoid light-emitting diode is burnt in the case of a high temperature.But the drawback of this method to cause illumination to interrupt, and even causes related accident.As document " design of illumination of high-power semiconductor driving power " (Changchun Polytechnic Univ.'s master thesis, 2011) in propose a kind of self-adaptation control method, LED lamp heat sink installs a temperature sensor, and its output is connected with single-chip microcomputer, when microprocessor detect exceedes permissible value to the temperature of radiator, then controlled the input power of LED by its PWM output, reduce caloric value, make the temperature return of LED lamp heat sink normal.The control effects of the method is better, but brings the problem of control system complexity, cost of manufacture increase, and be not particularly suitable for widely used small-power green lighting system, the scope of application is very limited.
Summary of the invention
In order to avoid the deficiencies in the prior art part, the present invention proposes a kind of LED lamp radiator temperature online adaptation control circuit, this circuit is according to LED lamp heat sink currency and rate of change thereof, online adaptive adjustment LED input power, and the slippage of the radiator dissipation capabilities making the rising because of ambient temperature cause is suitable with the slippage of input power, thus make radiator temperature remain in safe range, avoid high temperature failure LED component, be particularly suitable for the occasion that variation of ambient temperature is larger.
The technical solution adopted for the present invention to solve the technical problems is: comprise temperature sensor D
1, gradient regulating resistance R
1, divider resistance R
2, load circuit current constant control resistance R
3, temperature sensor D
1with gradient regulating resistance R
1after series connection, with divider resistance R
2parallel connection, and be serially connected in constant-current source and load circuit current constant control resistance R
3between; Resistance R
2with IC
1input port "-" end connect, with IC
2, IC
3power tube control end is inputed to after combination; The collector electrode of power tube is connected to the negative terminal of LED lamp, and emitter is connected to load circuit current constant control resistance R
3the other end; Hold with power supply buses "+" again after the anode of LED lamp is connected with constant-current source and connect; "-" of bus is connected to gradient regulating resistance R
1with load circuit current constant control resistance R
3common junction place; V
1control LED lamp input voltage, and V
1=V
fT+ V
2; Temperature sensor D
1the LED diode with LED lamp same model, V
fTfor temperature sensor D
1the pressure drop at two ends; Gradient regulating resistance R
1be used to change V
1rise and the slope of curve of decline with temperature, V
2for resistance R
1the voltage at two ends; R
2for divider resistance, the size of its partial pressure value depends on R
3, be R
3pressure drop V
3higher limit, R
3for load circuit current constant control resistance;
When ambient temperature rises, due to temperature sensor D
1negative temperature characteristic, make V
fTdecline; Due to R
1regulating action, then V
1fall off rate be restricted to △ V
1/ △
t≈ δ, in formula, Δ Τ is ambient temperature ascending amount, Δ v
1for Δ Τ causes V
1slippage;
Due to V
1be used to control LED lamp input power, make the heat dissipation amount P of LED chip
dalso press δ to reduce; Meanwhile, due to the rising of ambient temperature, the dissipation capabilities of radiator declines, and fall off rate is △ P
d/ △ T=η, wherein, Δ P
dfor the dissipation capabilities slippage of radiator;
The condition selected due to element in circuit ensures that premised on δ=η, namely the slippage of radiator dissipation capabilities is suitable with the slippage of input power; Due to the guarantee of δ=η condition, the temperature on radiator reaches balance in prescribed limit.
Beneficial effect
A kind of LED lamp radiator temperature online adaptation control circuit that the present invention proposes, it is according to LED lamp heat sink currency and rate of change thereof, online adaptive adjustment LED input power, and the slippage of the radiator dissipation capabilities making the rising because of ambient temperature cause is suitable with the slippage of input power, no matter the change of ambient temperature, temperature on radiator all can reach balance in prescribed limit, avoid high temperature failure LED component, thus improve the reliability of LED in hot environment.Control circuit of the present invention is particularly suitable for the larger occasion of variation of ambient temperature; Use a small amount of hardware because this technology only uses, implement simple, be convenient to promote; And compared with prior art, improve reliability, reduce cost, expand the scope of application.
Accompanying drawing explanation
Below in conjunction with drawings and embodiments, a kind of LED lamp radiator temperature online of the present invention adaptation control circuit is described in further detail.
Fig. 1 is the temperature online self-adaptative adjustment circuit theory diagrams of LED.
Embodiment
The present embodiment is a kind of LED lamp radiator temperature online adaptation control circuit.
A.. the theoretical foundation of the present invention's proposition
During LED work, because the existence of thermal resistance, the temperature of PN junction is expressed as:
T
J＝T
A+R
θP
D⑴
In formula, T
jfor PN junction temperature, T
afor ambient temperature,
R
θfor PN junction is to the thermal resistance of environment, P
dfor heat dissipation;
Wherein, PN junction temperature T
jnamely radiator temperature is approximately; For LED, 3% ~ 5% of input electric power converts light energy to and exports, and remainder is dissipated in device with form of heat, therefore can be similar to the product representation heat dissipation P by forward voltage drop and input current
d, very large deviation can not be brought to experimental study.
Be connected with electrical equipment for fixing device heat dissipation structure, chip is certain to the thermal resistance of environment, like this, when input power is constant, can be similar to and thinks that the knots modification of ambient temperature just equals the changes values of tube core PN junction temperature.
The rising of ambient temperature affects major embodiment both ways to LED performance parameter:
First LED two ends forward voltage drop dullness reduces; If selected with the LED diode of light fixture same model as temperature sensor D
1, to ensure the consistency of thermal parameter in wide temperature range, then D
1pN junction voltage V
fTcan approximate representation be:
V
FT＝V
F0+K(T-T
0)⑵
V in formula
fTtemperature sensor D when be ambient temperature being T
1the voltage at two ends, V
f0be ambient temperature be T
0time D
1the voltage at two ends, K is that voltage varies with temperature coefficient, is negative value.Such as, luminescent material is InGaN, to be the K value of the LED chip of SiC be backing material :-2.66 (mV/ degree).
Its two, LED heat-sinking capability decline; Had by (1) formula:
P
D＝(T
J-T
A)/R
θ⑶
Obviously, for given T
j, R
θvalue, works as T
aduring rising, allow heat-dissipating power P
ddecline thereupon.
: when ambient temperature raise not only make the heat dissipation ability of LED chip decline, also make its PN junction pressure drop decline, both makes LED thermal environment worsen all further as can be seen from formula (2), (3).The present invention be directed to this demand to put forward, by the adjustment of online adaptive dissipation power, radiator temperature is remained in allowed band.
B.. the specific embodiment of the invention
Consult Fig. 1, the present invention's each components and parts effect and calculation method of parameters as follows:
(1) temperature sensor D
1, be the LED diode with LED lamp same model, to ensure the consistency of thermal parameter in wide temperature range.D
1there is negative temperature characteristic, when ambient temperature rises, its PN junction voltage V
fTwill decline.
(2) gradient regulating resistance R
1, be used for changing V
1rise and the slope of curve of decline with temperature, it is core of the present invention.
V
1temperature variant rate of change δ is:
V
1＝V
2+V
FT＝I
0R
1+V
FT
0+K(T-T
0)⑷
In formula, V
fTfor temperature sensor D
1the pressure drop at two ends, V
2for resistance R
1the voltage at two ends;
Obtained by (4) formula:
△V
1/△T≈KT/(V
2+V
FT
0)＝δ⑸
In formula, Δ Τ is ambient temperature ascending amount, Δ v
1for Δ Τ causes V
1slippage;
In addition, along with the change of ring temperature, the dissipation rate η that can be obtained radiator by (3) formula is expressed as:
△P
D/△T＝△T/R
θ＝η⑹
In formula, Δ P
dfor the dissipation capabilities slippage of radiator;
When ambient temperature is raised, radiator temperature is constant, need meet δ=η, can obtain:
KT/(V
2+V
FT
0)＝△T/R
θ
That is: V
2=I
0r
1=V
ft
0+ KR
θ;
So:
R
1＝(V
FT
0+KR
θ)/I
0(7)
Formula (7) in, V
f, T
0, K, R
θ, I
0be known quantity.
(3) divider resistance R
2, the size of its partial pressure value depends on R
3, be R
3pressure drop V
3higher limit;
If R
2=r
1+ r
2, by requirement of the present invention, r
1, r
2selection need meet following condition;
Divide pressure request: i.e. r
1, r
2selection need meet V
1r
1/ (r
1+ r
2)=I
1r
3, with the effect making circuit play temperature protection and constant current simultaneously.
Streaming request: due to I
0that constant-current source exports, in order to avoid R
2to D
1-R
1the shunting of branch road and affect precision, must make R
2resistance enough large, as far as possible little to the shunting of constant-current source, be about 0.02I
0.
(4) load circuit current constant control resistance R
3, the requirement of the present invention to this resistance is: should make R
3dissipation power reaches minimum, also will make the V detected
3(I
1r
3) value meet voltage comparator input anti-interference, required precision, be generally tens ~ hundreds of milliohm, the size of apparent load electric current is determined.
(5) the selection of other element is selected by general circuit design principle, constant-current source output current I
0be about D
11/10 of rated current; IC
1, IC
2, IC
3select general MOS device; Power tube is pressed load and is selected; Triangular-wave generator selects ready-made circuit.
Control procedure:
Control circuit of the present invention and method, when ambient temperature rises, due to temperature sensor D
1negative temperature characteristic, make V
fTdecline.But, due to R
1regulating action, then V
1fall off rate be restricted to △ V
1/ △ T ≈ δ.
Due to V
1be used to control LED lamp input power, make the heat dissipation amount P of LED chip
dalso press δ to reduce; On the other hand, due to the rising of ambient temperature, the dissipation capabilities of radiator also declines, and fall off rate is △ P
d/ △ T=η.
The condition selected due to element in circuit ensures that premised on δ=η, namely the slippage of radiator dissipation capabilities is suitable with the slippage of input power; Therefore, no matter the change of ambient temperature, due to the guarantee of δ=η condition, the temperature on radiator all can reach balance in prescribed limit, thus improves the reliability of LED in hot environment.
Claims (1)
1. a LED lamp radiator temperature online adaptation control circuit, is characterized in that: comprise temperature sensor D
1, gradient regulating resistance R
1, divider resistance R
2, load circuit current constant control resistance R
3, temperature sensor D
1with gradient regulating resistance R
1after series connection, with divider resistance R
2parallel connection, and be serially connected in constant-current source and load circuit current constant control resistance R
3between; Resistance R
2with voltage comparator ic
1input port "-" end connect, voltage comparator ic
1with trigger IC
2connection, trigger IC
2and with door IC
3connect, with door IC
3be connected with the control end of power tube; The collector electrode of power tube is connected to the negative terminal of LED lamp, and emitter is connected to load circuit current constant control resistance R
3the other end; Hold with power supply buses "+" again after the anode of LED lamp is connected with constant-current source and connect; "-" of bus is connected to gradient regulating resistance R
1with load circuit current constant control resistance R
3common junction place; V
1control LED lamp input voltage, and V
1=V
fT+ V
2; Temperature sensor D
1the LED diode with LED lamp same model, V
fTfor temperature sensor D
1the voltage at two ends; Gradient regulating resistance R
1be used for changing V
1rise and the slope of curve of decline with temperature, V
2for resistance R
1the voltage at two ends; Divider resistance R
2, the size of its partial pressure value depends on R
3, be R
3pressure drop V
3higher limit;
When ambient temperature rises, due to temperature sensor D
1negative temperature characteristic, make V
fTdecline; Due to R
1regulating action, then V
1fall off rate be restricted to △ V
1/ △ T ≈ δ, in formula, Δ Τ is ambient temperature ascending amount, Δ v
1for Δ Τ causes V
1slippage;
Due to V
1be used to control LED lamp input power, make the heat dissipation amount P of LED chip
dalso press δ to reduce; Meanwhile, due to the rising of ambient temperature, the dissipation capabilities of radiator declines, and fall off rate is △ P
d/ △ T=η, wherein, Δ P
dfor the dissipation capabilities slippage of radiator;
The condition selected due to element in circuit ensures that premised on δ=η, namely the slippage of radiator dissipation capabilities is suitable with the slippage of input power; Due to the guarantee of δ=η condition, the temperature on radiator reaches balance in prescribed limit.
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| CN201410018278.1A CN103747587B (en) | 2014-01-15 | 2014-01-15 | A kind of LED lamp radiator temperature online adaptation control circuit |
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|---|---|---|---|
| CN201410018278.1A CN103747587B (en) | 2014-01-15 | 2014-01-15 | A kind of LED lamp radiator temperature online adaptation control circuit |
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| CN103747587B true CN103747587B (en) | 2016-03-30 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105142272A (en) * | 2015-08-23 | 2015-12-09 | 合肥艾斯克光电科技有限责任公司 | Cooling failure processing method for light emitting diode (LED) lamp |
| CN105163428A (en) * | 2015-08-23 | 2015-12-16 | 合肥艾斯克光电科技有限责任公司 | Radiating control device of light-emitting diode (LED) lamp |
| CN108120918A (en) * | 2017-08-07 | 2018-06-05 | 鸿秦（北京）科技有限公司 | A kind of chip makes physical destroys online test method and device on effect circuit board |
| CN108075632B (en) * | 2017-12-28 | 2019-08-13 | 深圳市创新微源半导体有限公司 | A kind of self-adaptive temperature protection circuit |
| CN113803654B (en) * | 2021-09-18 | 2024-03-22 | 厦门东昂科技股份有限公司 | High heat dissipation lamp structure using LED lamp |
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| US7663326B2 (en) * | 2007-05-22 | 2010-02-16 | Msilica Incorporated | Temperature dependant LED current controller |
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| JP5653238B2 (en) * | 2011-01-31 | 2015-01-14 | 株式会社小糸製作所 | Semiconductor light source lighting circuit |
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|---|---|---|---|---|
| US8111011B1 (en) * | 2007-01-11 | 2012-02-07 | Leotek Electronics Corporation | LED luminaire with improved life and operation management |
| CN102869155A (en) * | 2012-09-06 | 2013-01-09 | 上海晶丰明源半导体有限公司 | LED (light-emitting diode) driving source control circuit and control method thereof |
| CN103281836A (en) * | 2013-06-06 | 2013-09-04 | 东莞博用电子科技有限公司 | Chip over-temperature protection circuit applied to alternative current LED drive system |
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