CN108549426A - Light weight intelligent heat dissipation type LED car lamp module control method - Google Patents
Light weight intelligent heat dissipation type LED car lamp module control method Download PDFInfo
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- CN108549426A CN108549426A CN201810277292.1A CN201810277292A CN108549426A CN 108549426 A CN108549426 A CN 108549426A CN 201810277292 A CN201810277292 A CN 201810277292A CN 108549426 A CN108549426 A CN 108549426A
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- led
- fan
- temperature
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- heat dissipation
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D23/00—Control of temperature
- G05D23/19—Control of temperature characterised by the use of electric means
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/10—Controlling the intensity of the light
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Lighting Device Outwards From Vehicle And Optical Signal (AREA)
- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
Abstract
The invention discloses a kind of light weight intelligent heat dissipation type LED car lamp module control method, first, pass through temperature sensor（3）Detect the temperature of position, LED chip（2）It is installed on substrate with temperature sensor（1）On, substrate is installed on radiator（4）On；Second, calculate LED junction point temperature Tj, Tj=T+P*Rth, Tj：LED junction point temperature；Third, as Tj≤TjLimit, TjLimi is LED junction point limit value temperature, and intelligent heat dissipation control module passes through fan control device（7）Control fan（5）In off position, module is driven by LED（6）LED chip is controlled, LED module electric current I is made to be increased with the reduction of LED junction point temperature Tj, to enhance the output of module LED luminous flux；4th, as Tj ＞ TjLimit, fan is opened, and rotation speed of the fan increases and its rotating speed increases until fan maximum (top) speed allowed with LED junction point temperature Tj temperature, so that LED junction point temperature Tj is no more than Tjlimit, and LED module electric current I is made to maintain LED module limit value electric current Ilimit.
Description
Technical field
The present invention relates to a kind of automobile lighting lamp more particularly to a kind of LED car lamp module control methods.
Background technology
Since regulation and lighting demand are more demanding to the luminous flux output of LED headlamps, there was only great power LED so
Can meet demand, general LED needs 15W or more, if but great power LED radiate can influence the output of LED light flux, pole not in time
Limit condition is likely to result in the damage of LED.Currently on the market LED headlamps cooling system be divided into active heat removal, passive heat dissipation and
Three kinds of circuit current limliting.
1, active heat removal is mainly based on radiator fan, as long as the radiator fan of this type is headlamp, open will be with
Full power state works, and no matter what state is external environment be in, and energy waste and fan life is easily caused to reduce in this way.
2, passive heat dissipation is based on high thermal conductive metallic radiating block, in order to meet the condition of automobile limiting condition, radiating block
Volume and weight is larger, and if under individual extreme working position, radiating block cannot be satisfied radiating requirements, LED light may be caused logical
Calorimetric decaying is serious or LED is damaged.
3, the heat dissipation of circuit current limliting controls LED current, although protection mainly using thermistor as sensor by detecting temperature
LED heat damages, but luminous flux can be caused drastically to decline, normal illumination demand is influenced, there are security risks.
Automobile is considered due to being influenced by season, area and various operating modes, such as in pole cryogenic region or season, not demand
Radiator fan works and excessive radiator, but must assure that under the maximum conditions of running car, such as in high temperature area
Engine is travelled down with maximum power, ensures illuminating effect and the service life of LED lamp.And the illumination of automobile lamp by country and
Field method restrictions system, high temperature can reduce LED luminous intensities and it is photochromic change, limiting condition may cause regulation satisfaction property lose
Effect.
LED lamps cooling device is mainly used in great power LED headlamp function, such as dipped beam or distance light, in order to meet
Headlamp optics regulation and road illumination, reach 15W or more as the LED power of headlamp functional requirement, lamps and lanterns generally require be
One closed space structure, entire LED headlights module can be placed in the cavity of leakproofness, in addition to LED module, toward forward
Lamp also has the steering indicating light function of other functions of high-power lamp bulb, such as the corner lamp of 55W halogen light sources, fog lamp or 21W, institute
Some functions can all increase the environment temperature around LED module, but these functions can't work with LED headlight modules simultaneously,
So ensureing LED life and lighting requirements, need to install radiator and radiator fan additional to radiate.
Invention content
The purpose of the present invention is to provide a kind of light weight intelligent heat dissipation type LED car lamp module control method, the control methods
It can realize that the lightweight of LED module, intelligent heat dissipation simultaneously improve illumination output and security performance.
In order to achieve the above technical purposes, the present invention adopts the following technical scheme that：
A kind of light weight intelligent heat dissipation type LED car lamp module control method,
LED chip and temperature sensor are installed on substrate, substrate is installed on radiator, and fan corresponds to radiator, LED
Module is driven to connect LED chip, fan control device connects fan, and intelligent heat dissipation control module includes LED driving modules and wind
Control device is fanned, temperature sensor connects intelligent heat dissipation control module；
The light weight intelligent heat dissipation type LED car lamp module control method is：
First, the temperature of position is detected by temperature sensor；
Second, LED junction point temperature Tj, Tj=T+P*Rth are calculated,
Wherein：Tj：LED junction point temperature；
T：The temperature of temperature sensor detection；
P：System power；
Rth：Thermal resistance between LED junction point and temperature sensor；
Third, as Tj≤TjLimit, wherein TjLimi is LED junction point limit value temperature, and intelligent heat dissipation control module passes through fan
Control device controls fan, and fan is in off position；And intelligent heat dissipation control module drives module to control by LED
LED chip makes LED module electric current I be increased with the reduction of LED junction point temperature Tj, to enhance the output of module LED luminous flux,
The highest limit value of LED module electric current I is Imax；
4th, as Tj ＞ TjLimit, intelligent heat dissipation control module controls fan by fan control device, and fan is opened, and
Rotation speed of the fan increases and its rotating speed increases until fan maximum (top) speed allowed with LED junction point temperature Tj temperature, makes
LED junction point temperature Tj is no more than Tjlimit, and LED module electric current I is made to maintain Ilimit, and Ilimit is LED module limit value electricity
Stream.
The LED junction point limit value temperature Tjlimit is the restrictive condition that fan is opened, and TjLimit need to meet no more than LED
Permitted maximum junction temperature Tjmax itself.
The LED module limit value electric current Ilimit is maximum current Imax permitted no more than LED itself.
In 4th step, beyond defined extreme operating conditions, if fan with maximum power operation, but Tj ＞
TjLimit, then LED module electric current I can with temperature increase and reduce.The LED module electric current I is minimum to be down to LED module electricity
Flow minimum value Imin.
Light weight intelligent heat dissipation type LED car lamp module control method of the present invention considers the applying working condition and lamps and lanterns work(of vehicle
The energy working condition of itself, can realize that the lightweight of LED module, intelligent heat dissipation simultaneously improve illumination output and security performance, realize
Energy saving loss of weight extends the service life.
The beneficial effects of the invention are as follows：
1）Since the design condition of radiator is less than defined lamps and lanterns extreme operating conditions temperature, so LED module weight drops
It is low, realize that lightweight, volume can also reduce.
2）The unlatching of fan and wind speed change with the temperature that temperature sensor detects, and ensure LED light flux output and LED
Energy consumption can be reduced under service life.
3）Changed according to external environment, module electric current can be automatically controlled, under the premise of ensureing module performance, enhancing module light is logical
Amount output.
Description of the drawings
Fig. 1 is light weight intelligent heat dissipation type LED car lamp modular structure schematic diagram；
Fig. 2 is the temperature relation schematic diagram of the electric current and temperature sensor of LED chip；Wherein the longitudinal axis is expressed as the electricity of LED chip
I is flowed, horizontal axis is expressed as the temperature T of temperature sensor；
Fig. 3 is the temperature relation schematic diagram of the electric current and temperature sensor of fan；
Fig. 4 is another electric current of fan and the temperature relation schematic diagram of temperature sensor.
In figure：1 substrate（PCB）, 2 LED chips, 3 temperature sensors, 4 radiators, 5 fans, 6 driving modules, 7 fan controls
Device processed.
Specific implementation mode
The invention will be further described in the following with reference to the drawings and specific embodiments.
Referring to Fig. 1, a kind of light weight intelligent heat dissipation type LED car lamp module control method is by LED chip 2 and temperature sensing
Device 3 is installed on substrate 1, and substrate 1 is installed on radiator 4, and fan 5 corresponds to radiator 4, and LED drives module 6 to connect LED
Chip 2, fan control device 7 connect fan 5, and intelligent heat dissipation control module includes that LED drives module 6 and fan control device 7,
Temperature sensor 3 connects intelligent heat dissipation control module.
Wherein：1 abbreviation PCB of substrate, substrate 1 are aluminum substrate, or the PCB or multilayer FR4 of other metal bases.
LED chip 2 is light source.The material of radiator 4 can be different high thermal conductive metallic material, and radiator 4 will have sufficiently large
Surface area, and radiating fin can be come into full contact with the air-flow of fan 5, more preferably to reach heat dissipation purpose.Temperature sensor 3
It is generally mounted on substrate 1, can accurately detect the temperature of LED chip 2, but the arrangement can be by it during fan 5 works
It influences.So can also choice arrangement in the region not influenced by fan 5, for example be arranged on driving module 6 or additional make
One device arranges temperature sensor 3.
A kind of light weight intelligent heat dissipation type LED car lamp module control method, step are：
First, the temperature of position is detected by temperature sensor 3；
Second, LED junction point temperature Tj, Tj=T+P*Rth are calculated,
Wherein：Tj：LED junction point temperature；
T：The temperature of temperature sensor detection；
P：System power；
Rth：Thermal resistance between LED junction point and temperature sensor；
Third, as Tj≤TjLimit, wherein TjLimi is LED junction point limit value temperature, and intelligent heat dissipation control module passes through fan
Control device 7 controls fan 5, and fan 5 is in off position；And intelligent heat dissipation control module drives module 6 to control by LED
LED chip 2 processed makes LED module electric current I be increased with the reduction of LED junction point temperature Tj, defeated to enhance module LED luminous flux
Go out, the highest limit value of LED module electric current I is Imax；
4th, as Tj ＞ TjLimit, intelligent heat dissipation control module controls fan 5 by fan control device 7, and fan 5 is opened,
And rotation speed of the fan increases and its rotating speed increases until fan maximum (top) speed allowed with LED junction point temperature Tj temperature,
So that LED junction point temperature Tj is no more than Tjlimit, and LED module electric current I is made to maintain Ilimit, Ilimit is LED module limit value
Electric current.Beyond defined extreme operating conditions, if fan with maximum power operation, but Tj ＞ TjLimit, then LED module electricity
Stream can be reduced as temperature increases.The LED module electric current I is minimum to be down to LED module current minimum Imin.
The LED junction point limit value temperature Tjlimit is the restrictive condition that fan is opened, and TjLimit need to meet no more than LED
Permitted maximum junction temperature Tjmax itself.
The LED module limit value electric current Ilimit is maximum current Imax permitted no more than LED itself.
The intelligent heat dissipation control module controls the electric current of the electric current and LED chip by fan respectively, to realize to wind
The control of fan operation and LED chip luminous quantity.
The design of radiator 4 is rather than the extreme operating conditions based on the most common working environment pattern of LED module
Temperature.Such as LED low-beam functions, the use environment of the general function is night, and can obtain vehicle by meteorological data
The mean temperature of operational area, secondly by Design vehicle, under at the uniform velocity transport condition, front truck summer in the evening（Cabin）Lamps and lanterns week
The measurement of temperature, the comprehensive operating ambient temperature for obtaining lamps and lanterns are enclosed, and this environment temperature is less than extreme operating conditions temperature certainly
Degree.
The design of radiator 4 is based on less than the LED junction that designs at a temperature of extreme operating conditions, and need to be controlled by setting
The point limit value temperature Tjlimit and limit value electric current Ilimit by LED, to realize the lightweight of module, and the LED under the conditions of this
Node limit value temperature Tjlimit is the restrictive condition that fan is opened, and Tjlimit can be unique value, can also be value range, and
TjLimit need to meet maximum junction temperature Tjmax permitted no more than LED itself, and Ilimit is no more than LED itself and is allowed
Maximum current Imax, with this condition, the optics regulation of designed function should not fail.Tjmax and Imax can be by looking into
It askes the specifications of LED production firms or is obtained by actual test.
LED junction point temperature Tj can be by the temperature sensor that is arranged in LED module come indirect detection, temperature sensor
Position there is no limit, LED can be placed on on block PCB, other regions can also be placed on, then pass through Tj=T+P*Rth
Tj values are obtained, wherein T is the temperature of temperature sensor detection, and P is system power, and Rth is between LED junction point and temperature sensor
Thermal resistance.Likewise, the value of the LED junction point temperature Tj of control can be designed by needs, temperature sensor temperature T is calculated.
In addition LED junction point temperature Tj can also be obtained by the voltage change of junction temperature itself, because of LED junction point temperature
Variation will cause the variations of LED voltages itself.
Embodiment：
Referring to Fig. 2, when the temperature range of temperature sensor 3 is more than Tlimit1 and is not more than Tlimit2, this fan is in work
Make state, and Ilimit is maintained by the electric current of LED chip 2, when the temperature of temperature sensor 3 is not more than Tlimit1, leads to
Crossing the electric current of LED chip 2 can rise, and be not higher than Imax, and fan 5 does not work at this time.When fan 5 is worked with maximum power, and
The temperature of temperature sensor 3 is more than Tlimit2, can be declined by the electric current of LED chip 2, and the minimum limit value of Imin is according to setting
Counting requirement can be different.
Referring to Fig. 3, when the temperature of temperature sensor 3 is less than or equal to Tlmit1, it is 0 by the electric current of fan 5, shows
Fan does not work, and when the temperature of temperature sensor 3 is equal to or more than Tlimit2, reaches design most by the electric current of fan 5
Big current limliting shows that fan is worked with maximum design power.Wherein 5 electric current of fan will be sent out with the variation of 3 temperature of temperature sensor
Changing, the variation can be not limited to linear relationship with arbitrary relationship.
Referring to Fig. 4, when the temperature of temperature sensor 3 is less than or equal to Tlimit, it is 0 by the electric current of fan 5, shows
Fan does not work, and when 3 temperature of temperature sensor is more than Tlimit, fan 5 will be worked with a particular design electric current I.
Light weight intelligent heat dissipation type LED car lamp module control method of the present invention considers the applying working condition and lamps and lanterns work(of vehicle
Can the working condition of itself, the lightweight of LED module, intelligent heat dissipation may be implemented and improve illumination output and security performance.
Light weight intelligent heat dissipation type LED car lamp module of the present invention, which is not limited to, to be applied in car headlamp function, is also applied for
Other automobile lamp functions of radiator and fan need to be used.
The above is merely preferred embodiments of the present invention, be not intended to limit the scope of the present invention, therefore, it is all
Any modification, equivalent replacement, improvement and so within the spirit and principles in the present invention should be included in the protection model of the present invention
Within enclosing.
Claims (5)
1. a kind of light weight intelligent heat dissipation type LED car lamp module control method, it is characterized in that：
By LED chip（2）And temperature sensor（3）It is installed on substrate（1）On, substrate（1）It is installed on radiator（4）On, fan
（5）Correspond to radiator（4）, LED driving modules（6）Connect LED chip（2）, fan control device（7）Connect fan（5）, intelligence
Energy radiating control module includes LED driving modules（6）And fan control device（7）, temperature sensor（3）Connect intelligent heat dissipation control
Molding block；
The light weight intelligent heat dissipation type LED car lamp module control method is：
First, pass through temperature sensor（3）Detect the temperature of position；
Second, LED junction point temperature Tj, Tj=T+P*Rth are calculated,
Wherein：Tj：LED junction point temperature；
T：The temperature of temperature sensor detection；
P：System power；
Rth：Thermal resistance between LED junction point and temperature sensor；
Third, as Tj≤TjLimit, wherein TjLimi is LED junction point limit value temperature, and intelligent heat dissipation control module passes through fan
Control device（7）Control fan（5）, fan（5）In off position；And intelligent heat dissipation control module is driven by LED
Module（6）Control LED chip（2）, so that LED module electric current I is increased with the reduction of LED junction point temperature Tj, to enhance module
The highest limit value of LED light flux output, LED module electric current I is Imax；
4th, as Tj ＞ TjLimit, intelligent heat dissipation control module passes through fan control device（7）Control fan（5）, fan
（5）Open, and rotation speed of the fan with LED junction point temperature Tj temperature increase and its rotating speed increase until the fan it is allowed most
Big rotating speed makes LED junction point temperature Tj be no more than Tjlimit, and LED module electric current I is made to maintain Ilimit, Ilimit LED
Module limit value electric current.
2. light weight intelligent heat dissipation type LED car lamp module control method according to claim 1, it is characterized in that：The LED junction
Point limit value temperature Tjlimit is the restrictive condition that fan is opened, and TjLimit need to meet no more than the permitted maximums of LED itself
Junction temperature Tjmax.
3. light weight intelligent heat dissipation type LED car lamp module control method according to claim 1, it is characterized in that：The LED moulds
Group limit value electric current Ilimit is maximum current Imax permitted no more than LED itself.
4. light weight intelligent heat dissipation type LED car lamp module control method according to claim 1, it is characterized in that：Described 4th
In step, beyond defined extreme operating conditions, if fan with maximum power operation, but Tj ＞ TjLimit, then LED module electricity
Stream I can be reduced as temperature increases.
5. light weight intelligent heat dissipation type LED car lamp module control method according to claim 4, it is characterized in that：The LED moulds
Group electric current I is minimum to be down to LED module current minimum Imin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810277292.1A CN108549426A (en) | 2018-03-31 | 2018-03-31 | Light weight intelligent heat dissipation type LED car lamp module control method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810277292.1A CN108549426A (en) | 2018-03-31 | 2018-03-31 | Light weight intelligent heat dissipation type LED car lamp module control method |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080170015A1 (en) * | 2007-01-11 | 2008-07-17 | Mitsubishi Electric Corporation | Display device |
| TW201229428A (en) * | 2011-01-03 | 2012-07-16 | Chicony Power Tech Co Ltd | Method for managing the heat dissipation of LED illumination device |
| CN103596325A (en) * | 2013-08-22 | 2014-02-19 | 广西奥顺仪器有限公司 | Large power LED digital linear light modulation system |
| CN204244529U (en) * | 2014-11-28 | 2015-04-01 | 山东科明光电科技有限公司 | With the driving power of LED heat radiation substrate temperature automatic control |
| CN107504426A (en) * | 2017-08-30 | 2017-12-22 | 上海汽车集团股份有限公司 | LED car lamp module cooling control method and device |
| CN107702078A (en) * | 2017-09-27 | 2018-02-16 | 嘉兴米石科技有限公司 | A kind of LED heat management system for automotive lighting |
-
2018
- 2018-03-31 CN CN201810277292.1A patent/CN108549426A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080170015A1 (en) * | 2007-01-11 | 2008-07-17 | Mitsubishi Electric Corporation | Display device |
| TW201229428A (en) * | 2011-01-03 | 2012-07-16 | Chicony Power Tech Co Ltd | Method for managing the heat dissipation of LED illumination device |
| CN103596325A (en) * | 2013-08-22 | 2014-02-19 | 广西奥顺仪器有限公司 | Large power LED digital linear light modulation system |
| CN204244529U (en) * | 2014-11-28 | 2015-04-01 | 山东科明光电科技有限公司 | With the driving power of LED heat radiation substrate temperature automatic control |
| CN107504426A (en) * | 2017-08-30 | 2017-12-22 | 上海汽车集团股份有限公司 | LED car lamp module cooling control method and device |
| CN107702078A (en) * | 2017-09-27 | 2018-02-16 | 嘉兴米石科技有限公司 | A kind of LED heat management system for automotive lighting |
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Application publication date: 20180918 |