CN107702078A - A kind of LED heat management system for automotive lighting - Google Patents
A kind of LED heat management system for automotive lighting Download PDFInfo
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- CN107702078A CN107702078A CN201710888671.XA CN201710888671A CN107702078A CN 107702078 A CN107702078 A CN 107702078A CN 201710888671 A CN201710888671 A CN 201710888671A CN 107702078 A CN107702078 A CN 107702078A
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- 238000004020 luminiscence type Methods 0.000 claims abstract description 79
- 238000001514 detection method Methods 0.000 claims abstract description 48
- 230000017525 heat dissipation Effects 0.000 claims abstract description 33
- 230000033228 biological regulation Effects 0.000 claims description 33
- 230000008859 change Effects 0.000 claims description 23
- 238000005498 polishing Methods 0.000 claims description 6
- 238000004088 simulation Methods 0.000 claims description 6
- 238000005286 illumination Methods 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 230000005856 abnormality Effects 0.000 claims description 3
- 230000032683 aging Effects 0.000 claims description 3
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- 210000004209 hair Anatomy 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/60—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air
- F21V29/67—Cooling arrangements characterised by the use of a forced flow of gas, e.g. air characterised by the arrangement of fans
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- General Engineering & Computer Science (AREA)
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a kind of LED heat management system for automotive lighting, mainly solves the problem of existing LED heat management system radiating effect is poor, and reliability is low.It includes LED luminescence units 1, controllable constant-current driver element 2, rotating speed controllable heat dissipation fan 3, LED temperature detection unit 4, actuation temperature detection unit 5 and micro-control unit 6；LED temperature detection unit 4 is on LED luminescence units 1, controllable constant-current driver element 2 is connected with LED luminescence units 1, controllable constant-current driver element 2 is provided with actuation temperature detection unit 5, LED temperature detection unit 4 and driving detection unit 5 are connected to micro-control unit 6, warm control unit 6 is connected to rotating speed controllable heat dissipation fan 3 and controllable constant-current driver element 2, and rotating speed controllable heat dissipation fan 3 is that LED luminescence units 1 radiate.The present invention realizes the LED heat management system of efficient high reliability, has ensured traffic safety by the way of intelligently a plurality of feedback loop is controlled in real time.
Description
Technical field
The present invention relates to electronic circuit technology field, particularly a kind of LED heat management system for automotive lighting.
Background technology
LED can also produce heat during operation as conventional light source, and luminous efficiency is higher, production
Raw heat is fewer.LED converts electrical energy into the efficiency of luminous energy and probably can only achieve 30% to 40% at present, remaining energy master
Heat energy is converted into the form of the lattice vibration that the non-radiative recombination in electronics and hole occurs.As one in semiconductor devices
Kind, LED service life can reduce with the rise of temperature, and too high temperature can reduce LED luminous efficiency or even lead
Cause its damage.Therefore, the operating temperature for controlling LED is vital.In the application of small power LED illumination, to ensure
It is in relatively low operating temperature, it will usually is equipped with a larger radiating block for it；And in the application of high-power LED illumination
In, conventional way is to be equipped with radiator fan for it to accelerate radiating rate, so as to reduce LED operating temperature.
In automotive illumination applications, LED working environment is more severe, and not only the engine of automobile can bring extra heat
Amount, and require that LED usually requires to be operated in a closed space, even if equipped with fan in view of sealing waterproof etc.
Radiating also be difficult to reduce LED operating temperature.
In addition, unlike conventional light source, LED is typical non-linear element, when be added in the voltage at LED both ends compared with
When low, LED is in cut-off state；And when voltage is more than specific value, LED will turn on luminous, the now small change of voltage
Change the great variety that may result in electric current, be easy to damage because of excessively stream if LED if not being any limitation as electric current, therefore LED is needed
To be driven by special constant-current drive circuit, and constant-current drive circuit can also be limited and produced by energy conversion efficiency
Unnecessary heat, the damage of itself of its drive circuit may also be caused by not only resulting in the increase of LED operation temperature.
The content of the invention
It is an object of the invention to the deficiency for above-mentioned existing LED heat management system, it is proposed that one kind is used for automobile and shone
Bright LED heat management system, to control LED and its constant-current drive circuit to be operated within the scope of reasonable temperature, extend making for LED
With the life-span, it is ensured that traffic safety.
To achieve the above object, the present invention includes LED luminescence units 1, controllable constant-current driver element 2, rotating speed controllable heat dissipation
Fan 3, LED temperature detection unit 4, actuation temperature detection unit 5 and micro-control unit 6；It is characterized in that：LED temperature detects
Unit 4 is on LED luminescence units 1, for detecting the temperature on LED luminescence units 2 and obtaining temperature signal TL, LED lights
Controllable constant-current driver element 2 is connected with unit 1, for controlling the electric current of LED luminescence units 1, on controllable constant-current driver element 2
Provided with actuation temperature detection unit 5, for detecting the temperature on controllable constant-current driver element 2 and obtaining temperature signal TD, temperature
Signal TLWith temperature signal TDIt is connected to micro-control unit 6 and is multiplied by weight coefficient α respectively1And α2, wherein 0≤α1≤ 1 and 0≤α2
≤ 1, micro-control unit 6 is by contrasting TL*α1With TD*α2Value and obtain speed controling signal S and electric current control by logical operation
Signal C processed, speed controling signal S are connected to rotating speed controllable heat dissipation fan 3, for controlling the rotating speed of rotating speed controllable heat dissipation fan 3
Become to LINEAR CONTINUOUS and turn to LED luminescence units 1 and radiate, and its actual rotary speed data is passed back into micro-control unit 6, electric current control
Signal C processed is connected to controllable constant-current driver element 2, for controlling the output current I LINEAR CONTINUOUSs of controllable constant-current driver element 2
Change.
Described LED luminescence units 1, LED temperature detection unit 4, micro-control unit 6 and the structure of rotating speed controllable heat dissipation fan 3
Into the first feedback loop, described LED luminescence units 1, LED temperature detection unit 4, micro-control unit 6 and controllable constant-current are driven
Moving cell 2 forms the second feedback loop, described controllable constant-current driver element 2, actuation temperature detection unit 5 and microcontroller list
Member 6 forms the 3rd feedback loop, and a plurality of feedback loop, which is overlapped mutually, ensures that LED luminescence units 1 and controllable constant-current driving are single
Member 2 can be operated within the scope of controllable temperature, and then realizes the reliable and stable of LED heat management system, i.e. three negative feedback loops
The stable operation of system can be continued to so as to ensure row by other feedback loops by having any ring to break down in road
Car safety.
The first described feedback loop, when the temperature of LED luminescence units 1 rises, LED temperature detection unit 4 samples
Change and output temperature signal T to temperatureLTo micro-control unit 6, micro-control unit 6 obtains rotating speed control by logical operation
Signal S is simultaneously raised with controlling the rotating speed LINEAR CONTINUOUS of rotating speed controllable heat dissipation fan 3, so as to suppress in the temperature of LED luminescence units 1
The trend of liter, to ensure that LED luminescence units 1 are in controllable operating temperature range；Conversely, at a temperature of LED luminescence units 1
During drop, LED temperature detection unit 4 samples the change of temperature and output temperature signal TLTo micro-control unit 6, micro-control unit
6 obtain speed controling signal S and reduce with controlling the rotating speed LINEAR CONTINUOUS of rotating speed controllable heat dissipation fan 3 by logical operation, from
And reach the purpose for reducing power consumption energy-conserving and environment-protective.
Described temperature signal TLIt is multiplied by weight coefficient α1Obtain Temperature numerical TL*α1, when it is less than minimum speed regulation door
Limit T1When, rotating speed controllable heat dissipation fan 3 is in minimum speed state and with lowest power consumption mode operation, as Temperature numerical TL*α1It is high
In minimum speed regulation thresholding T1And less than maximum speed regulation thresholding T2When, the rotating speed of rotating speed controllable heat dissipation fan 3 is with temperature
Numerical value TL*α1Increase and accelerate, as Temperature numerical TL*α1Reach at or above maximum speed regulation thresholding T2When, rotating speed is controllable to be dissipated
Hot-air fan 3 is in maximum speed state.
The second described feedback loop, when the temperature of LED luminescence units 1 rises, LED temperature detection unit 4 samples
Change and output temperature signal T to temperatureLTo micro-control unit 6, micro-control unit 6 obtains current control by logical operation
Signal C simultaneously reduces with controlling the output current LINEAR CONTINUOUS of controllable constant-current driver element 2, so as to reduce the work(of LED luminescence units 1
Rate, and then the caloric value of LED luminescence units 1 is reduced, reach the purpose of the ascendant trend for the temperature for suppressing LED luminescence units 1, with
LED luminescence units 1 are ensured in controllable operating temperature range, at the same time the caloric value of controllable constant-current driver element 2
It can reduce, it is suppressed that also inhibit the temperature of LED luminescence units 1 while the temperature ascendant trend of whole heat management system from side
Spend ascendant trend；Conversely, as the Wen Duxiajiang of LED luminescence units 1, LED temperature detection unit 4 samples the change of temperature simultaneously
Output temperature signal TLTo micro-control unit 6, micro-control unit 6 obtains current controling signal C by logical operation and control can
Increase with controlling the output current LINEAR CONTINUOUS of constant current driving unit 2, ensured that LED luminescence units 1 are in controllable temperature range
Brightness guarantee driving safety that is interior and increasing LED luminescence units 1 as far as possible.
Described temperature signal TLIt is multiplied by weight coefficient α1Obtain Temperature numerical TL*α1, when it is less than maximum speed regulation door
Limit T2When, the output current I of controllable constant-current driver element 2 reaches maximum current value IMAX, as Temperature numerical TL*α1Turn higher than highest
Velocity modulation section door limits T2And less than maximum brightness regulation thresholding T3When, the output current I of controllable constant-current driver element 2 is with temperature number
Value TL*α1Increase and reduce, as Temperature numerical TL*α1When reaching at or above maximum brightness regulation thresholding T3, controllable constant-current driving
The output current I of unit 2 is reduced to minimum value IMINSo that LED luminescence units 1 are in minimum brightness, are ensureing most basic photograph
Driver is reminded to pay attention to the abnormality guarantee driving safety of illuminator while bright function.
The 3rd described feedback loop, when the temperature of controllable constant-current driver element 2 rises, actuation temperature detection unit
5 sample the change of temperature and output temperature signal TDTo micro-control unit 6, micro-control unit 6 obtains electricity by logical operation
Flow control signals C, and reduce with controlling the output current LINEAR CONTINUOUS of controllable constant-current driver element 2, so as to reduce controllable constant-current
The power output of driver element 2 simultaneously reduces caused heat in electric energy transfer process, to ensure at controllable constant-current driver element 2
In in controllable operating temperature range；Otherwise when the temperature of controllable constant-current driver element 2 reduces, actuation temperature detection unit 5
Sample the change of temperature and output temperature signal TDTo micro-control unit 6, micro-control unit 6 obtains electric current by logical operation
Control signal C, and increase with controlling the output current LINEAR CONTINUOUS of controllable constant-current driver element 2, with controllable operating temperature
In the range of for LED luminescence units 1 provide electric current as big as possible, the brightness of increase LED luminescence units 1 is with guarantee driving safety.
Described micro-control unit 6 passes through to weight coefficient α1And α2Real-time regulation realize for the first feedback loop,
The dynamic of second feedback loop and the 3rd feedback loop matches, so as to reach to LED luminescence units 1 and controllable constant-current driving
The operating temperature of unit 2 carries out the purpose of Contrast tuned imaging, to improve the reliability of heat management system and carry to greatest extent
Rise the guarantee for traffic safety.
When micro-control unit 6 detects the rotating speed of rotating speed controllable heat dissipation fan 3 because the reasons such as aging or damage do not reach
When micro-control unit 6 is to its setting speed, micro-control unit 6 is by reducing temperature signal TLWeight coefficient α1, or improve temperature
Spend signal TDWeight coefficient α2Mode enable the second feedback control loop in advance and ensure the reliability of LED heat management system；When micro-
Control unit 6 detects the temperature signal T that LED temperature detection unit 4 is exportedLGeneration exception does not receive temperature signal TL
When, micro-control unit 6 is by temperature signal TLWeight coefficient α10 is arranged to, and temperature signal T is obtained by logical operationDPower
Weight factor alpha2, and use TD*α2Value simulation LED luminescence units 1 the first feedback loop and second for being damaged with polishing of temperature
Feedback loop, the fault-tolerance of LED heat management system is enhanced, ensure the reliability of LED heat management system；Similar, when micro-
Control unit 6 detects the temperature signal T that actuation temperature detection unit 5 is exportedDGeneration exception does not receive temperature signal TD
When, micro-control unit 6 is by temperature signal TDWeight coefficient α20 is arranged to, and temperature signal T is obtained by logical operationLPower
Weight factor alpha1, and use TL*α1The 3rd feedback loop that is damaged with polishing of the temperature of value simulation controllable constant-current driver element 2, increase
The strong fault-tolerance of LED heat management system, ensure the reliability of LED heat management system.
The present invention has advantages below compared with prior art：
(1) present invention is due to by the way of the regulation of radiating fan rotation speed variation with temperature LINEAR CONTINUOUS, reducing scattered
The power consumption of Hot-air fan at low temperatures, the heat-sinking capability of radiator fan in the case of a high temperature is enhanced, avoids rotation speed of the fan
The low-frequency noise caused by saltus step back and forth near certain temperature spot so that LED heat management system environmental protection is reliable and stable；
(2) present invention is due to by the way of the regulation of LED luminance variation with temperature LINEAR CONTINUOUS so that its brightness regulation
Process smooth, is visible by naked eyes stroboscopic, on the premise of ensureing that LED heat management system is reliable and stable, enhances driving peace
Entirely；
(3) present invention due to by the way of the nested superposition of three feedback loops, ensureing LED and its constant current in all directions
Driving is operated in controllable operating temperature range, even if having any ring to break down in three feedback loops can pass through
The stable operation that other feedback loops continue to system improves the stability of LED heat management system, enhances driving
Security；
(4) by the way of the present invention using Intelligent Measurement and temperature weight dynamic due to matching, LED heat management system is enhanced
Fault-tolerance.
Brief description of the drawings
Fig. 1 is a kind of LED heat management system structural representation for automotive lighting of the present invention；
Fig. 2 is the rotation speed of the fan adjustment curve and LED luminance adjustment curve schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing and embodiment, the invention will be further described.
Reference picture 1, LED heat management system of the invention include LED luminescence units 1, controllable constant-current driver element 2, rotating speed
Controllable heat dissipation fan 3, LED temperature detection unit 4, actuation temperature detection unit 5 and micro-control unit 6；Wherein：LED temperature is examined
Unit 4 is surveyed on LED luminescence units 1, for detecting the temperature on LED luminescence units 2 and obtaining temperature signal TL, LED hairs
Controllable constant-current driver element 2 is connected with light unit 1, for controlling the electric current of LED luminescence units 1, controllable constant-current driver element 2
Actuation temperature detection unit 5 is provided with, for detecting the temperature on controllable constant-current driver element 2 and obtaining temperature signal TD, temperature
Spend signal TLWith temperature signal TDIt is connected to micro-control unit 6 and is multiplied by weight coefficient α respectively1And α2, wherein 0≤α1≤ 1 and 0≤
α2≤ 1, micro-control unit 6 is by contrasting TL*α1With TD*α2Value and obtain speed controling signal S and electric current by logical operation
Control signal C, speed controling signal S are connected to rotating speed controllable heat dissipation fan 3, for controlling turning for rotating speed controllable heat dissipation fan 3
Become to fast LINEAR CONTINUOUS and turn to LED luminescence units 1 and radiate, and its actual rotary speed data is passed back into micro-control unit 6, electric current
Control signal C is connected to controllable constant-current driver element 2, for controlling the output current I LINEAR CONTINUOUSs of controllable constant-current driver element 2
Ground changes；
LED luminescence units 1, LED temperature detection unit 4, micro-control unit 6 and rotating speed controllable heat dissipation fan 3 form first
Feedback loop, LED luminescence units 1, LED temperature detection unit 4, micro-control unit 6 and controllable constant-current driver element 2 form the
Two feedback loops, controllable constant-current driver element 2, actuation temperature detection unit 5 and micro-control unit 6 form the 3rd negative feedback loop
Road, a plurality of feedback loop are overlapped mutually that to ensure that LED luminescence units 1 and controllable constant-current driver element 2 can be operated in controllable
In temperature range, and then the reliable and stable of LED heat management system is realized, be i.e. there is any ring event occur in three feedback loops
Barrier can continue to the stable operation of system so as to guarantee driving safety by other feedback loops.
Referring to Figures 1 and 2, the operation principle of the first feedback loop of the invention is：When the temperature of LED luminescence units 1
During rising, LED temperature detection unit 4 samples the change of temperature and output temperature signal TLTo micro-control unit 6, microcontroller list
Member 6 obtains speed controling signal S and raised with controlling the rotating speed LINEAR CONTINUOUS of rotating speed controllable heat dissipation fan 3 by logical operation,
So as to suppress the temperature ascendant trend of LED luminescence units 1, to ensure that LED luminescence units 1 are in controllable operating temperature range
It is interior；Conversely, as the Wen Duxiajiang of LED luminescence units 1, LED temperature detection unit 4 samples the change of temperature and output temperature
Signal TLTo micro-control unit 6, micro-control unit 6 obtains speed controling signal S by logical operation and controls rotating speed is controllable to dissipate
Reduce to the rotating speed LINEAR CONTINUOUS of Hot-air fan 3, so as to reach the purpose for reducing power consumption energy-conserving and environment-protective；
Temperature signal TLIt is multiplied by weight coefficient α1Obtain Temperature numerical TL*α1, when it is less than minimum speed regulation thresholding T1When,
Rotating speed controllable heat dissipation fan 3 is in minimum speed state and with lowest power consumption mode operation, as Temperature numerical TL*α1Higher than minimum
Rotational speed regulation thresholding T1And less than maximum speed regulation thresholding T2When, the rotating speed of rotating speed controllable heat dissipation fan 3 is with Temperature numerical
TL*α1Increase and accelerate, as Temperature numerical TL*α1Reach at or above maximum speed regulation thresholding T2When, rotating speed controllable heat dissipation wind
Fan 3 is in maximum speed state.
Referring to Figures 1 and 2, the operation principle of the second feedback loop of the invention is：When the temperature of LED luminescence units 1
During rising, LED temperature detection unit 4 samples the change of temperature and output temperature signal TLTo micro-control unit 6, microcontroller list
Member 6 obtains current controling signal C and subtracted with controlling the output current LINEAR CONTINUOUS of controllable constant-current driver element 2 by logical operation
It is small, so as to reduce the power of LED luminescence units 1, and then the caloric value of LED luminescence units 1 is reduced, reach and suppress the luminous lists of LED
The purpose of the ascendant trend of the temperature of member 1, to ensure that LED luminescence units 1 are in controllable operating temperature range, at the same time
The caloric value of controllable constant-current driver element 2 can also reduce, it is suppressed that while the temperature ascendant trend of whole heat management system
The temperature ascendant trend of LED luminescence units 1 is inhibited from side；Conversely, as the Wen Duxiajiang of LED luminescence units 1, LED temperature
Degree detection unit 4 samples change and the output temperature signal T of temperatureLTo micro-control unit 6, micro-control unit 6 passes through logic
Computing obtains current controling signal C and increased with controlling the output current LINEAR CONTINUOUS of controllable constant-current driver element 2, ensures
LED luminescence units 1 are within the scope of controllable temperature and increase the brightness guarantee driving safety of LED luminescence units 1 as far as possible；
Temperature signal TLIt is multiplied by weight coefficient α1Obtain Temperature numerical TL*α1, when it is less than maximum speed regulation thresholding T2When,
The output current I of controllable constant-current driver element 2 reaches maximum current value IMAX, as Temperature numerical TL*α1Adjusted higher than maximum speed
Thresholding T2And less than maximum brightness regulation thresholding T3When, the output current I of controllable constant-current driver element 2 is with Temperature numerical TL*α1
Increase and reduce, as Temperature numerical TL*α1When reaching at or above maximum brightness regulation thresholding T3, controllable constant-current driver element 2
Output current I is reduced to minimum value IMINSo that LED luminescence units 1 are in minimum brightness, are ensureing most basic illumination functions
While remind driver to pay attention to the abnormality guarantee driving safety of illuminator.
Referring to Figures 1 and 2, the operation principle of the 3rd feedback loop of the invention is：When controllable constant-current driver element 2
When temperature rises, actuation temperature detection unit 5 samples the change of temperature and output temperature signal TDIt is micro- to micro-control unit 6
Control unit 6 obtains current controling signal C by logical operation, and controls the output current of controllable constant-current driver element 2 linear
Continuously reduce, so as to reduce the power output of controllable constant-current driver element 2 and reduce caused heat in electric energy transfer process
Amount, to ensure that controllable constant-current driver element 2 is in controllable operating temperature range；Otherwise when controllable constant-current driver element 2
When temperature reduces, actuation temperature detection unit 5 samples the change of temperature and output temperature signal TDIt is micro- to micro-control unit 6
Control unit 6 obtains current controling signal C by logical operation, and controls the output current of controllable constant-current driver element 2 linear
Continuously increase, to be that LED luminescence units 1 provide electric current as big as possible, increase LED hairs in controllable operating temperature range
The brightness of light unit 1 is with guarantee driving safety.
Referring to Figures 1 and 2, micro-control unit 6 passes through to weight coefficient α1And α2Real-time regulation realize it is negative anti-for first
The dynamic proportioning of loop, the second feedback loop and the 3rd feedback loop is presented, so as to reach to LED luminescence units 1 and controllable
The operating temperature of constant current driving unit 2 carries out the purpose of Contrast tuned imaging, to improve the reliability of heat management system and maximum
The guarantee for traffic safety is lifted to limit, its concrete operating principle is：
When micro-control unit 6 detects the rotating speed of rotating speed controllable heat dissipation fan 3 because the reasons such as aging or damage do not reach
When micro-control unit 6 is to its setting speed, micro-control unit 6 is by reducing temperature signal TLWeight coefficient α1, or improve temperature
Spend signal TDWeight coefficient α2Mode enable the second feedback control loop in advance and ensure the reliability of LED heat management system；When micro-
Control unit 6 detects the temperature signal T that LED temperature detection unit 4 is exportedLGeneration exception does not receive temperature signal TL
When, micro-control unit 6 is by temperature signal TLWeight coefficient α10 is arranged to, and temperature signal T is obtained by logical operationDPower
Weight factor alpha2, and use TD*α2Value simulation LED luminescence units 1 the first feedback loop and second for being damaged with polishing of temperature
Feedback loop, the fault-tolerance of LED heat management system is enhanced, ensure the reliability of LED heat management system；Similar, when micro-
Control unit 6 detects the temperature signal T that actuation temperature detection unit 5 is exportedDGeneration exception does not receive temperature signal TD
When, micro-control unit 6 is by temperature signal TDWeight coefficient α20 is arranged to, and temperature signal T is obtained by logical operationLPower
Weight factor alpha1, and use TL*α1The 3rd feedback loop that is damaged with polishing of the temperature of value simulation controllable constant-current driver element 2, increase
The strong fault-tolerance of LED heat management system, ensure the reliability of LED heat management system.
Reference picture 2, TL*α1Value and TD*α2Value compare, wherein larger value is as reference temperature T, when with reference to temperature
Spend T and be less than minimum speed regulation thresholding T1When, rotating speed controllable heat dissipation fan 3 is in minimum speed state, at LED luminescence units 1
In brightness highest state；When reference temperature T is more than minimum speed regulation thresholding T1And less than maximum speed regulation thresholding T2When,
The rotating speed of rotating speed controllable heat dissipation fan 3 is accelerated with reference temperature T increase, and LED luminescence units 1 are in brightness highest shape
State；When reference temperature T is more than maximum speed regulation thresholding T2And less than maximum brightness regulation thresholding T3When, rotating speed controllable heat dissipation wind
Fan 3 is in maximum speed state, and the brightness of LED luminescence units 1 reduces with reference temperature T increase；When reference temperature T is big
In maximum brightness regulation thresholding T3When, rotating speed controllable heat dissipation fan 3 is in maximum speed state, and LED luminescence units 1 are in minimum
Luminance state.
It the above is only the preferred example of the present invention, do not form any limitation of the invention, it is clear that the present invention's
Under design, different change and improvement can be carried out to its structure, but these the present invention protection row.
Claims (9)
1. a kind of LED heat management system for automotive lighting, including LED luminescence units (1), controllable constant-current driver element (2),
Rotating speed controllable heat dissipation fan (3), LED temperature detection unit (4), actuation temperature detection unit (5) and micro-control unit (6)；Its
It is characterised by：LED temperature detection unit (4) is on LED luminescence units (1), for detecting the temperature on LED luminescence units (2)
Spend and obtain temperature signal TL, controllable constant-current driver element (2) is connected with LED luminescence units (1), for controlling LED to light
The electric current of unit (1), controllable constant-current driver element (2) are provided with actuation temperature detection unit (5), are driven for detecting controllable constant-current
Temperature on moving cell (2) simultaneously obtains temperature signal TD, temperature signal TLWith temperature signal TDIt is connected to micro-control unit (6) simultaneously
Weight coefficient α is multiplied by respectively1And α2, wherein 0≤α1≤ 1 and 0≤α2≤ 1, micro-control unit (6) is by contrasting TL*α1With TD*α2
Value and obtain speed controling signal S and current controling signal C by logical operation, speed controling signal S is connected to rotating speed can
Control radiator fan (3), for control rotating speed controllable heat dissipation fan (3) rotating speed LINEAR CONTINUOUS become and turn to LED luminescence units (1)
Radiating, and its actual rotary speed data is passed back into micro-control unit 6, it is single that current controling signal C is connected to controllable constant-current driving
First (2), for control controllable constant-current driver element (2) output current I LINEAR CONTINUOUSs change.
2. LED heat management system according to claim 1, it is characterised in that described LED luminescence units (1), LED temperature
Detection unit (4), micro-control unit (6) and rotating speed controllable heat dissipation fan (3) form the first feedback loop, described LED hairs
Light unit (1), LED temperature detection unit (4), micro-control unit (6) and controllable constant-current driver element (2) form the second negative-feedback
It is negative anti-that loop, described controllable constant-current driver element (2), actuation temperature detection unit (5) and micro-control unit (6) form the 3rd
Loop is presented, a plurality of feedback loop, which is overlapped mutually, ensures that LED luminescence units (1) and controllable constant-current driver element (2) can work
Within the scope of controllable temperature, and then the reliable and stable of LED heat management system is realized, be i.e. have any one in three feedback loops
Ring breaks down the stable operation that system can be continued to by other feedback loops so as to guarantee driving safety.
3. LED heat management system according to claim 2, it is characterised in that the first described feedback loop, when LED is sent out
When the temperature of light unit (1) rises, LED temperature detection unit (4) samples the change of temperature and output temperature signal TLTo micro-
Control unit (6), micro-control unit (6) obtain speed controling signal S by logical operation and control rotating speed controllable heat dissipation fan
(3) raise to rotating speed LINEAR CONTINUOUS, so as to suppress the temperature ascendant trend of LED luminescence units (1), to ensure that LED is luminous single
First (1) is in controllable operating temperature range；Conversely, as the Wen Duxiajiang of LED luminescence units (1), LED temperature detection is single
First (4) sample the change of temperature and output temperature signal TLTo micro-control unit (6), micro-control unit (6) is transported by logic
Calculation obtains speed controling signal S and reduced with controlling the rotating speed LINEAR CONTINUOUS of rotating speed controllable heat dissipation fan (3), is reduced so as to reach
The purpose of power consumption energy-conserving and environment-protective.
4. the first feedback loop according to claim 3, it is characterised in that described temperature signal TLIt is multiplied by weight coefficient
α1Obtain Temperature numerical TL*α1, when it is less than minimum speed regulation thresholding T1When, rotating speed controllable heat dissipation fan (3) is in minimum turn
Fast state and with lowest power consumption mode operation, as Temperature numerical TL*α1Higher than minimum speed regulation thresholding T1And it is less than maximum speed
Adjust thresholding T2When, the rotating speed of rotating speed controllable heat dissipation fan (3) is with Temperature numerical TL*α1Increase and accelerate, work as Temperature numerical
TL*α1Reach at or above maximum speed regulation thresholding T2When, rotating speed controllable heat dissipation fan (3) is in maximum speed state.
5. LED heat management system according to claim 2, it is characterised in that the second described feedback loop, when LED is sent out
When the temperature of light unit (1) rises, LED temperature detection unit (4) samples the change of temperature and output temperature signal TLTo micro-
Control unit (6), micro-control unit (6) obtain current controling signal C by logical operation and control controllable constant-current driver element
(2) reduce to output current LINEAR CONTINUOUS, so as to reduce the power of LED luminescence units (1), and then reduce LED luminescence units
(1) caloric value, the purpose of the ascendant trend for the temperature for suppressing LED luminescence units (1) is reached, to ensure LED luminescence units (1)
In controllable operating temperature range, at the same time the caloric value of controllable constant-current driver element (2) can also reduce, it is suppressed that whole
Also the temperature ascendant trend of LED luminescence units (1) is inhibited while the temperature ascendant trend of individual heat management system from side；Instead
It, as the Wen Duxiajiang of LED luminescence units (1), LED temperature detection unit (4) samples the change of temperature and output temperature
Signal TLTo micro-control unit (6), micro-control unit (6) obtains current controling signal C by logical operation and controls controllable constant
Increase to the output current LINEAR CONTINUOUS of stream driver element (2), ensured that LED luminescence units (1) are in controllable temperature range
Brightness guarantee driving safety that is interior and increasing LED luminescence units (1) as far as possible.
6. the second feedback loop according to claim 5, it is characterised in that described temperature signal TLIt is multiplied by weight coefficient
α1Obtain Temperature numerical TL*α1, when it is less than maximum speed regulation thresholding T2When, the output current of controllable constant-current driver element (2)
I reaches maximum current value IMAX, as Temperature numerical TL*α1Higher than maximum speed regulation thresholding T2And less than maximum brightness regulation thresholding
T3When, the output current I of controllable constant-current driver element (2) is with Temperature numerical TL*α1Increase and reduce, as Temperature numerical TL*
α1When reaching at or above maximum brightness regulation thresholding T3, the output current I of controllable constant-current driver element (2) is reduced to minimum value
IMINSo that LED luminescence units (1) are in minimum brightness, remind driver to pay attention to while most basic illumination functions are ensured
The abnormality guarantee driving safety of illuminator.
7. LED heat management system according to claim 2, it is characterised in that the 3rd described feedback loop, when controllable
When the temperature of constant current driving unit (2) rises, actuation temperature detection unit (5) samples the change of temperature and output temperature signal
TDTo micro-control unit (6), micro-control unit (6) obtains current controling signal C by logical operation, and controls controllable constant-current to drive
Reduce to the output current LINEAR CONTINUOUS of moving cell (2), so as to reduce the power output of controllable constant-current driver element (2) and reduction
Caused heat in electric energy transfer process, to ensure that controllable constant-current driver element (2) is in controllable operating temperature range；
Otherwise when the temperature reduction of controllable constant-current driver element (2), actuation temperature detection unit (5) samples the change of temperature and defeated
Go out temperature signal TDTo micro-control unit (6), micro-control unit (6) obtains current controling signal C by logical operation, and controls
Increase to the output current LINEAR CONTINUOUS of controllable constant-current driver element (2), to be lighted in controllable operating temperature range for LED
Unit (1) provides electric current as big as possible, and the brightness of increase LED luminescence units (1) is with guarantee driving safety.
8. LED heat management system according to claim 2, it is characterised in that described micro-control unit (6) passes through to power
Weight factor alpha1And α2Real-time regulation realize for the first feedback loop, the second feedback loop and the 3rd feedback loop
Dynamic is matched, and real-time intelligent is carried out to the operating temperature of LED luminescence units (1) and controllable constant-current driver element (2) so as to reach
The purpose of control, to improve the reliability of heat management system and lift the guarantee for traffic safety to greatest extent.
9. LED heat management system according to claim 8, it is characterised in that when micro-control unit (6) detects that rotating speed is controllable
The rotating speed of radiator fan (3) is not due to when the reasons such as aging or damage reach micro-control unit (6) to its setting speed, micro-control
Unit (6) processed is by reducing temperature signal TLWeight coefficient α1, or improve temperature signal TDWeight coefficient α2Mode shift to an earlier date
The second feedback control loop is enabled to ensure the reliability of LED heat management system；When micro-control unit (6) detects that LED temperature detects
The temperature signal T that unit (4) is exportedLGeneration exception does not receive temperature signal TLWhen, micro-control unit (6) believes temperature
Number TLWeight coefficient α10 is arranged to, and temperature signal T is obtained by logical operationDWeight coefficient α2, and use TD*α2's
The first feedback loop and the second feedback loop that the temperature of value simulation LED luminescence units (1) is damaged with polishing, are enhanced
The fault-tolerance of LED heat management system, ensure the reliability of LED heat management system；Similar, when micro-control unit (6) detects
The temperature signal T that actuation temperature detection unit (5) is exportedDGeneration exception does not receive temperature signal TDWhen, micro-control unit
(6) by temperature signal TDWeight coefficient α20 is arranged to, and temperature signal T is obtained by logical operationLWeight coefficient α1, and
Use TL*α1Value simulation controllable constant-current driver element (2) temperature with polishing be damaged the 3rd feedback loop, enhance LED heat
The fault-tolerance of management system, ensure the reliability of LED heat management system.
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Application publication date: 20180216 |