CN108521692A - The temprature control method and LED illumination System of LED illumination System - Google Patents
The temprature control method and LED illumination System of LED illumination System Download PDFInfo
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- CN108521692A CN108521692A CN201810234018.6A CN201810234018A CN108521692A CN 108521692 A CN108521692 A CN 108521692A CN 201810234018 A CN201810234018 A CN 201810234018A CN 108521692 A CN108521692 A CN 108521692A
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- 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]
- H05B45/30—Driver circuits
- H05B45/37—Converter circuits
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- 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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
Abstract
A kind of temprature control method and LED illumination System of LED illumination System comprising：During the temperature of LED illumination System is increased to second temperature T2 by initial temperature T0, it is initial current I0 to control the LED light electric current；During the temperature is increased to third temperature T3 by second temperature T2, controls the LED light electric current and the first electric current I1 is dropped to by initial current I0；During the temperature is increased to the 5th temperature T5 by third temperature T3, controls the LED light electric current and the second electric current I2 is dropped to by the first electric current I1；During the temperature drops to the 4th temperature T4 by third temperature T3, controls the LED light electric current and be maintained at the first electric current I1；During the temperature drops to the first temperature T1 by the 4th temperature T4, controls the LED light electric current and restored to initial current I0 by the first electric current I1.The temprature control method makes LED illumination System during the work time will not flashing light.
Description
Technical field
The invention belongs to the temprature control methods and LED of electron electric power technical field more particularly to a kind of LED illumination System
Lighting system.
Background technology
Common LED illumination System is made of on hardware lampshade, control power supply and lamp bead, as shown in Figure 1.Wherein, it controls
Power supply processed controls the brightness of LED lamp bead, namely the power of control LED light with this for controlling the electric current for flowing through lamp bead.LED
For lighting system as light source, when converting electrical energy into luminous energy, there is transfer efficiencies, will produce higher environment temperature, and add
Upper control power supply itself can generate heat, and therefore, when LED illumination System works, control power supply in order to prevent and lamp bead is burnt, need
It is controlled come the temperature carried out to LED illumination System under high temperature by temperature-current curve.
Although at present in the industry frequently with temperature-current curve as shown in Fig. 2, the controlling mechanism can reach protection control electricity
Source is not because of the purpose of high temperature damage, still, carries out temperature detection to LED illumination System by sensor, according to Fig. 2, is sensing
During device temperature TS is gradually increased to T2 by T0, the electric current ILED of LED keeps I0 constant；When sensor temperature is continued by T2
During rising to T3, the electric current of LED is continuously decreased by I0 as I1；When sensor temperature reaches T3, for prevent component because
High temperature damages, and LED illumination System is closed；After LED illumination System is closed, sensor temperature continuously decreases, when sensor temperature drops
When down to T1, LED illumination System reopens, and the electric current of LED reverts to I0.As long as the above analysis is it is found that sensor temperature TS
T3 can be reached, then LED illumination System can recycle in closing and unlatching, so as to cause flashing light phenomenon.
Invention content
The present invention provides a kind of temprature control method and LED illumination System of LED illumination System, it is intended to solve traditional needle
LED illumination System can be caused the problem of flashing light phenomenon occur the temperature control scheme of LED illumination System.
A kind of temprature control method of LED illumination System, including：
The temperature of LED light bead string is obtained in real time；
During the temperature is increased to second temperature T2 by initial temperature T0, the LED of the LED light bead string is controlled
Lamp current is initial current I0, wherein initial temperature T0 is the temperature when LED light bead string starts；
During the temperature is increased to third temperature T3 by second temperature T2, the LED light electric current is controlled by first
Beginning electric current I0 drops to the first electric current I1；
During the temperature is increased to the 5th temperature T5 by third temperature T3, the LED light electric current is controlled by
One electric current I1 drops to the second electric current I2；
During the temperature drops to the 4th temperature T4 by third temperature T3, controls the LED light electric current and keep
In the first electric current I1；
During the temperature drops to the first temperature T1 by the 4th temperature T4, the LED light electric current is controlled by
One electric current I1 restores to initial current I0；
Wherein, T4 is less than T2, and T1 is more than T0, and I2 ratios I0 is the second ratio, and I1 ratios I0 is the first ratio；Second ratio is less than
Or it is equal to the first ratio.
In addition, a kind of LED illumination System is additionally provided, including a rectifier bridge, an input capacitance, an energy storage inductor, a drop
Voltage-controlled coremaking piece, a rectifier diode, a load capacitance, a sampling resistor, LED light bead string and one obtain the LED light in real time
The temperature sensor of the temperature of bead string, the rectifier bridge two input termination power, and the input capacitance is connected to the rectifier bridge
Positive and negative output end between, the power pins of the decompression control chip meet the positive and negative output end of the rectifier bridge, institute respectively
The driving pin for stating decompression control chip connects the anode of the rectifier diode, the current detecting pin of the decompression control chip
The negative output terminal of the rectifier bridge is connect by the sampling resistor, the cathode of the rectifier diode connects the just defeated of the rectifier bridge
, the anode of the LED light bead string in parallel with the rectifier diode after outlet, the load capacitance and energy storage inductor series connection
Connect the positive output end of the rectifier bridge, the cathode of the LED light bead string connects connecing altogether for the load capacitance and the energy storage inductor
End；The decompression control chip includes temperature current control module, and the temperature current control module is used for：
During the temperature is increased to second temperature T2 by initial temperature T0, the LED of the LED light bead string is controlled
Lamp current is initial current I0, wherein initial temperature T0 is the temperature when LED light bead string starts；
During the temperature is increased to third temperature T3 by second temperature T2, the LED light electric current is controlled by first
Beginning electric current I0 drops to the first electric current I1；
During the temperature is increased to the 5th temperature T5 by third temperature T3, the LED light electric current is controlled by
One electric current I1 drops to the second electric current I2；
During the temperature drops to the 4th temperature T4 by third temperature T3, controls the LED light electric current and keep
In the first electric current I1；
During the temperature drops to the first temperature T1 by the 4th temperature T4, the LED light electric current is controlled by
One electric current I1 restores to initial current I0；
Wherein, T4 is less than T2, and T1 is more than T0, and I2 ratios I0 is the second ratio, and I1 ratios I0 is the first ratio；Second ratio
Less than or equal to first ratio.
The temprature control method of LED illumination System based on the embodiment of the present invention, in the worked of LED illumination System
Cheng Zhong, on the one hand effectively LED illumination System is controlled into trip temperature, and protection system will not be damaged because of high temperature, another aspect energy
It enough solves the problems, such as that traditional temperature control scheme can lead to LED illumination System flashing light, has at least one degeneracy during control
Point exist so that LED illumination System during the work time will not flashing light, avoid the generation of flashing light phenomenon.
Description of the drawings
Fig. 1 is common LED illumination System；
Fig. 2 is traditional LED illumination System temperature current controlling curve；
Fig. 3 is first embodiment of the present invention LED illumination System temperature current controlling curve；
Fig. 4 is second embodiment of the present invention LED illumination System temperature current controlling curve；
Fig. 5 is third embodiment of the present invention LED illumination System temperature current controlling curve；
Fig. 6 is fourth embodiment of the present invention LED illumination System temperature current controlling curve；
Fig. 7 is fifth embodiment of the present invention LED illumination System temperature current controlling curve；
Fig. 8 is the LED illumination System structural schematic diagram that one embodiment of the invention provides；
Fig. 9 is the exemplary circuit schematic diagram of temperature current control module in LED illumination System shown in Fig. 8.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
Here, being described in detail elaboration to the temprature control method of LED illumination System provided in an embodiment of the present invention：
When LED illumination System works, the temperature of LED illumination System is obtained in real time, specifically, passes through temperature sensor reality
When obtain the temperature of LED illumination System, and control according to the temperature and its situation of change that get the LED of LED illumination System
Lamp current.In embodiments of the present invention, the LED light electric current refers both to the electric current that power supply flows through LED lamp bead.
In embodiments of the present invention, for the temperature of LED illumination System and its situation of change, LED lamp bead is flowed through to power supply
Electric current execute following control program：
1, during the temperature of LED illumination System is increased to second temperature T2 by initial temperature T0, LED illumination is controlled
The LED light electric current of system is initial current I0.Here, temperature when initial temperature T0 is LED illumination System startup.
That is, during the temperature of LED illumination System is gradually increased to T2 by initial temperature T0, the LED light of LED is controlled
It is constant that electric current remains I0.
2, during the temperature of LED illumination System is increased to third temperature T3 by second temperature T2, LED illumination is controlled
The LED light electric current of system drops to the first electric current I1 by initial current I0.
That is, after the temperature of LED illumination System reaches T2, during temperature continues to rise to T3 by T2, LED is controlled
The LED light electric current of lighting system is continuously decreased by I0 as I1.
3, during the temperature of LED illumination System is increased to the 5th temperature T5 by third temperature T3, LED illumination is controlled
The LED light electric current of system drops to the second electric current I2 by the first electric current I1.
That is, after the temperature of LED illumination System reaches T3, if temperature continues to rise to T5, LED illumination System is controlled
LED light electric current I2 is dropped rapidly to larger slope.In embodiments of the present invention, I2 is the current value of a very little, excellent
The value range of the ratio of selection of land, I2 and I0 be 5%~30%, that is, the current value of I2 can for I0 current value 5%~
30%.
Here, due to I2 value very littles, when the LED light electric current of LED illumination System is I2, the fever of LED illumination System
Very little is measured, therefore, unless external heat source is to LED illumination System continuous heating, otherwise with the calorific value of LED illumination System itself,
The temperature of LED illumination System can not possibly be made to continue to rise to T5, to protect the component of LED illumination System will not be due to temperature is excessively high
Damage.
4, during the temperature of LED illumination System drops to the 4th temperature T4 by third temperature T3, LED illumination is controlled
The LED light electric current of system is maintained at the first electric current I1.
That is, after being down to T3 at a temperature of LED illumination System, if temperature continues to drop to T4, LED illumination System is controlled
It is constant that LED light electric current is maintained at I1.
5, during the temperature of LED illumination System drops to the first temperature T1 by the 4th temperature T4, LED illumination is controlled
The LED light electric current of system is restored by the first electric current I1 to initial current I0.
That is, during the temperature of LED illumination System drops to T1 by T4, control the LED light electric current of LED illumination System by
I1 is gradually brought to I0.
The above control program can be realized based on temperature-current curve as shown in Figure 3, wherein T4 is less than T2, and T1 is big
It is the second ratio in T0, I2 ratios I0, I1 ratios I0 is the first ratio；Second ratio is less than or equal to the first ratio.It, should with reference to Fig. 3
In curve, the slop control of introducing T2 to T3 and the slop control of T4 to T1, slope K 3=I1 ÷ I0,10%≤K3≤
80%, keep the LED light curent change of LED illumination System slow；The sluggish electric current for introducing I0 and I1, enhances anti-interference ability.
Under the control of temperature-current curve shown in Fig. 3, it is VOUT, illumination system to enable the output voltage of LED illumination System
The energy conversion efficiency of system is η 0, and light energy use efficiency is η 1, and it is RT (unit to enable the thermal resistance of LED illumination System：DEG C/W), then：
The calorific value calculation formula of LED illumination System is P=VOUT × ILED ÷ η 0 × (1- η 1), wherein ILED is upper
LED light electric current described in text；
In ILED=I0, P_I0=VOUT × I0 ÷ η 0 × (1- η 1)；
In ILED=I1, P_I1=VOUT × I1 ÷ η 0 × (1- η 1)；
Enable the LED illumination System of no temperature-current curve control when output current is I0, output voltage is VOUT
Temperature is T_I0, then：
T_I0=P_I0 ÷ RT+TE, wherein TE are environment temperature.
Enable the LED illumination System of no temperature-current curve control output current is I1, output voltage is VOUT (LED
Varied less when modulating voltage changes with output current, ignore here output voltage variation) when control system temperature be T_I1,
Then：
T_I1=P_I1 ÷ RT+TE；
(T_I1-TE) ÷ (T_I0-TE)=P_I1 ÷ P_I0=I1 ÷ I0=K3；
So there is following equation 1：(T_I1-TE) ÷ (T_I0-TE)=I1 ÷ I0=K3.
The meaning of formula 1 is：It is identical in output voltage, control the Wen Shengyu output electricity of LED illumination System
It flows directly proportional.
For a LED illumination System, if T1 ＜ T_I0 ＜ T2, T_I1 ＜ T2, T_I0 ＞ T1, then the system subtracts from T2
Small be reduced to again to T4 in the curve of T1 can find some system is allowed to settle out, similarly, from T1 increase to T2 be further added by
Any can also be found in the curve of T3 allows system to settle out；If T_I0 ＜ T1, then the system is stablized；If T_I0 ＞ T2,
And T_I1 ＜ T3, then the system is reduced in the curve of T3 from T2 and can find some system is allowed to settle out, similarly, from T3
Any can also be found system is allowed to settle out by being reduced to T4 and being reduced to again in the curve of T1；If T_I1 ＞ T3, then the system
Any can be found by, which increasing to from T3 in the curve of T5, allows system to settle out.
Based on the analysis above to temperature-current curve as shown in Figure 3, the temperature-current curve T1 to T2 to T3 extremely
With the presence of at least one degeneracy point in the curved section of T4 to T1 so that LED illumination System during the work time will not flashing light.
As an embodiment of the present invention, the simple version of the temperature-current curve of Fig. 3 displayings is further given,
As shown in figure 4, the curve is on the basis of curve as shown in Figure 3, enable the second electric current I2 is equal with the first electric current I1 to obtain.
With reference to Fig. 4, in the curve, slope K 4=I1 ÷ I0,10%≤K4≤80% protects system will not be because of temperature mistake
It is high and damage.In the curve, the slop control of T2 to T3 and the slop control of T4 to T1 are introduced, LED illumination System is made
LED light curent change is slow；The sluggish electric current for introducing I0 and I1, enhances anti-interference ability.
Based on the analysis to temperature-current curve shown in Fig. 3, similarly, temperature-current curve shown in Fig. 4 T1 extremely
With the presence of at least one degeneracy point in the curved section of T2 to T3 to T4 to T1 so that LED illumination System during the work time will not
Flashing light.
As an embodiment of the present invention, another simplification of the temperature-current curve of Fig. 3 displayings is further given
Version, as shown in figure 5, the curve is on the basis of curve as shown in Figure 4, enable third temperature T3 equal with second temperature T2
It arrives.
With reference to Fig. 5, in the curve, slope K 5=I1 ÷ I0,50%≤K5≤80%, and expression formula need to be met：(T1 ﹣ TE)
÷ (T2 ﹣ TE)≤K5, protects system not damaged because temperature is excessively high.In the curve, the slop control of T4 to T1 is introduced, is made
The LED light curent change of LED illumination System is slow；The sluggish electric current for introducing I0 and I1, enhances anti-interference ability；It is required that 50%
≤ K5≤80%, (T1 ﹣ TE) ÷ (T2 ﹣ TE)≤K5, and have strict demand to K5 and T1, T2, it ensure that the hair of LED illumination System
Wen Sheng caused by heat is in T1 to T2 to T4 to controlled between T1.
Based on the analysis to temperature-current curve shown in Fig. 3, similarly, temperature-current curve shown in fig. 5 T1 extremely
With the presence of at least one degeneracy point in the curved section of T2 to T4 to T1 so that LED illumination System during the work time will not flashing light.
As an embodiment of the present invention, another simplification of the temperature-current curve of Fig. 3 displayings is further given
Version, as shown in fig. 6, the curve is on the basis of curve as shown in Figure 4, enable the 4th temperature T4 equal with the first temperature T1
It arrives.
LED illumination System temperature current controlling curve as shown in Figure 6, is to enable I2=on the basis of curve as shown in Figure 3
I1 enables T4=T1 obtain.
With reference to Fig. 6, in the curve, slope K 6=I1 ÷ I0,50%≤K6≤80%, and expression formula need to be met：(T1 ﹣ TE)
÷ (T2 ﹣ TE)≤K6, protects system not damaged because temperature is excessively high.In the curve, the slop control of T2 to T3 is introduced, is made
System change is slow；The sluggish electric current for introducing I0 and I1, enhances anti-interference ability；It is required that 50%≤K6≤80%, (T1 ﹣ TE)
÷ (T2 ﹣ TE)≤K6, and have strict demand to K6 and T1, T2, it ensure that Wen Sheng is in T1 caused by the calorific value of LED illumination System
To T2 to T3 to controlled between T1.
Based on the analysis to temperature-current curve shown in Fig. 3, similarly, temperature-current curve shown in fig. 6 T1 extremely
With the presence of at least one degeneracy point in the curved section of T2 to T3 to T1 so that LED illumination System during the work time will not flashing light.
As an embodiment of the present invention, the simple version of the temperature-current curve of Fig. 3 displayings is further given,
As shown in fig. 7, the curve is on the basis of curve as shown in Figure 3, I2=I1 is enabled, T4=T1 is enabled, T3=T2 is enabled to obtain.
With reference to Fig. 7, in the curve, slope K 7=I1 ÷ I0,60%≤K7≤80%, and need to meet (T1 ﹣ TE) ÷ (T2 ﹣
TE)≤K7 protects system not damaged because temperature is excessively high；In the curve, the sluggish electric current of I0 and I1 is introduced, is enhanced anti-
Interference performance；It is required that 60%≤K7≤80%, (T1 ﹣ TE) ÷ (T2 ﹣ TE)≤K7, and have strict demand to K7 and T1, T2, ensure
Wen Sheng caused by the calorific value of LED illumination System is in T1 between T2 controlled.
Based on the analysis to temperature-current curve shown in Fig. 3, similarly, LED illumination System temperature current shown in Fig. 7
Controlling curve, with the presence of at least one degeneracy point, makes LED illumination System exist in the temperature-current curve of T1 to T2 to T1
It will not flashing light in the course of work.
One of LED illumination System temperature current controlling curve specific embodiment using the present invention：Voltage-dropping type LED illumination control
The schematic diagram of system processed is as shown in Figure 8；
A kind of LED illumination System, including a rectifier bridge (D1-D4), an input capacitance CIN, an energy storage inductor L0, a decompression
Control chip 100, a rectifier diode D4, a load capacitance CL, a sampling resistor RCS, LED light bead string 200 and one obtain in real time
The temperature sensor (not shown) of the temperature of the LED light bead string 200, the rectifier bridge (D1-D4) two is taken to input termination power,
The input capacitance CIN is connected between the positive and negative output end of the rectifier bridge (D1-D4), the decompression control chip 100
Power pins (Vcc+, Gnd) connect the positive and negative output end of the rectifier bridge (D1-D4) respectively, the decompression control chip 100
Driving pin Out connects the anode of the rectifier diode D4, and the current detecting pin CS of the decompression control chip 100 passes through institute
The negative output terminal that sampling resistor RCS meets the rectifier bridge (D1-D4) is stated, the cathode of the rectifier diode D4 connects the rectifier bridge
It is (D1-D4) in parallel with the rectifier diode D4 after positive output end, the load capacitance CL and energy storage inductor L0 series connection,
The anode of the LED light bead string 200 connects the positive output end of the rectifier bridge (D1-D4), and the cathode of the LED light bead string 200 connects
The connects end altogether of the load capacitance CL and the energy storage inductor L0；The decompression control chip 100 includes that temperature current controls mould
Block 101, the temperature current control module 101 are used for：
During the temperature is increased to second temperature T2 by initial temperature T0, the LED light bead string 200 is controlled
LED light electric current is initial current I0, wherein initial temperature T0 is the temperature when LED light bead string 200 starts；
During the temperature is increased to third temperature T3 by second temperature T2, the LED light electric current is controlled by first
Beginning electric current I0 drops to the first electric current I1；
During the temperature is increased to the 5th temperature T5 by third temperature T3, the LED light electric current is controlled by
One electric current I1 drops to the second electric current I2；
During the temperature drops to the 4th temperature T4 by third temperature T3, controls the LED light electric current and keep
In the first electric current I1；
During the temperature drops to the first temperature T1 by the 4th temperature T4, the LED light electric current is controlled by
One electric current I1 restores to initial current I0；
Wherein, T4 is less than T2, and T1 is more than T0, and I2 ratios I0 is the second ratio, and I1 ratios I0 is the first ratio；Second ratio
Less than or equal to first ratio.
Decompression control chip 100 further includes reference voltage source 102, Logic control module in a more specific embodiment,
103, drive module 104, the first metal-oxide-semiconductor 105, the lowest point detection module 106, peak detection block 107, wherein：
The reference voltage source 102 is connect with the power pins (Vcc+, Gnd) of the decompression control chip 100, and described the
The drain electrode of one metal-oxide-semiconductor 105 meets the driving pin Out of the decompression control chip 100, and the source electrode of first metal-oxide-semiconductor 105 meets institute
State the current detecting pin CS of decompression control chip 100；
The lowest point detection module 106 is connected to the grid of first metal-oxide-semiconductor 105 and the temperature current control module
Between 101, the temperature current control module 101 is output to according to the lowest point signal for detecting first metal-oxide-semiconductor 105；
The temperature current control module 101 is connected to the lowest point detection module 106 and the Logic control module 103
Between, the lowest point delay time signal is exported to the Logic control module 103 according to the lowest point signal；
The peak detection block 107 is connected to the source electrode and the Logic control module 103 of first metal-oxide-semiconductor 105
Between, the peak-current signal for detecting first metal-oxide-semiconductor 105 is exported to the Logic control module 103；
The drive module 104 is connected between the Logic control module 103 and the grid of first metal-oxide-semiconductor 105,
104 Logic control module 103 of the drive module drives according to the lowest point delay time signal and the peak-current signal
First metal-oxide-semiconductor, 105 break-make.
Temperature current control module 101 is put including the first hysteresis comparator HYS1, the second hysteresis comparator HYS2, a mutual conductance
Big device GM0, the first divider resistance R0, the second divider resistance R1, third divider resistance R2, the 4th divider resistance R3, the first capacitance
C0, the second capacitance C1, the first PTAT (Proportional To Absolute Temperature, with absolute temperature is proportional to)
Current source I10, the second PTAT current source I11, a constant-current source I12, a diode D5, a zener diode Z0, the second metal-oxide-semiconductor
M0, third metal-oxide-semiconductor M1, a phase inverter INV0 and one and door AND2；
The normal phase input end of the first hysteresis comparator HYS1 connects described first by the first divider resistance R0
The anti-phase input of PTAT current source I10, the first hysteresis comparator HYS1 terminate the second PTAT current source I11, described
The output of first hysteresis comparator HYS1 terminates the grid of the second metal-oxide-semiconductor M0, and the drain electrode of the second metal-oxide-semiconductor M0 passes through institute
The normal phase input end that the second divider resistance R1 meets the first hysteresis comparator HYS1 is stated, the drain electrode of the second metal-oxide-semiconductor M0 is also
It is grounded by the third divider resistance R2, the source electrode ground connection of the second metal-oxide-semiconductor M0；The positive of the trsanscondutance amplifier GM0
Input terminates the first PTAT current source I10, and the anti-phase input of the trsanscondutance amplifier GM0 terminates second PTAT current
The anode of source I11 and the diode D5, the minus earth of the diode D5, the output termination of the trsanscondutance amplifier GM0
The inverting input of the cathode of the zener diode Z0 and the second hysteresis comparator HYS2, the 4th divider resistance R3
It is in parallel with the zener diode Z0 with the first capacitance C0；The normal phase input end of the second hysteresis comparator HYS2 meets institute
It states the drain electrode of constant-current source I12 and the third metal-oxide-semiconductor M1 and is grounded by the second capacitance C1, second hysteresis comparator
The input termination input terminal with door AND2 of HYS2, another input with door AND2 terminate the phase inverter INV0
Input terminal, output end output the lowest point delay time of the output end with door AND2 as temperature current control module 101
Signal, the output of the phase inverter INV0 terminate the grid of the third metal-oxide-semiconductor M1, the source electrode ground connection that the 2nd MOS is closed, institute
The input terminal for stating phase inverter INV0 detects signal as the input terminal access the lowest point of temperature current control module 101.
Specifically, AC power inputs AC signals, by fuse F0, the full-bridge rectification that is made of D0, D1, D2, D3 it
Afterwards, electric energy is stored in input capacitance CIN；Electric energy in input capacitance CIN passes through energy storage inductor L0, decompression control chip
100, rectifier diode D4 is depressured, and electric energy is transferred to load capacitance CL, the electric energy in load capacitance CL is to LED light bead string
200 are powered, and achieve the purpose that drive LED light bead string 200；The maximum output current of the voltage-dropping type LED illumination control system
It is configured by sampling resistor RCS；The temperature-current curve of the voltage-dropping type LED illumination control system is by internal temperature current control
System (curve) module 101 is set.
PTAT current I10 generates PTAT voltage by divider resistance R1, R2, R0, is input to the positive of trsanscondutance amplifier GM0
Input terminal；PTAT current I11 by diode D5 generate CTAT (Complementary to absolute temperature,
With absolute temperature complementarity) voltage, it is input to the inverting input of trsanscondutance amplifier GM0；Trsanscondutance amplifier GM0 to PTAT voltage and
The difference of CTAT voltage carries out mutual conductance amplification, obtains mutual conductance electric current IGM0, is input to divider resistance R3, capacitance C0, voltage-stabiliser tube Z0,
Stable voltage V0 is obtained on capacitance C0；Constant current I12, capacitance C1, the second metal-oxide-semiconductor M1, hysteresis comparator HYS2, phase inverter
INV0, with door AND2 to voltage V0 processing, obtain time the lowest point delay time signal T0, it is directly proportional to the voltage of V0；It is defeated
It is that signal is detected in the lowest point to enter signal IN, and output signal OUT is the lowest point delay time signal；When the circuit is by increasing the lowest point delay
Between, output current is reduced, temperature current controlling curve is obtained；First hysteresis comparator HYS1 and the first metal-oxide-semiconductor M0 and third point
The sluggish control of piezoresistance R2 compositions, obtains sluggish temperature control curve.It is bent by temperature current controlling curve and sluggish temperature control
Line is combined into the LED illumination System temperature current controlling curve of the present invention.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement etc., should all be included in the protection scope of the present invention made by within refreshing and principle.
Claims (10)
1. a kind of temprature control method of LED illumination System, which is characterized in that including：
The temperature of LED light bead string is obtained in real time；
During the temperature is increased to second temperature T2 by initial temperature T0, it is initial electricity to control the LED light electric current
Flow I0, wherein initial temperature T0 is the temperature when LED light bead string starts；
During the temperature is increased to third temperature T3 by second temperature T2, the LED light electric current is controlled by initial electricity
Stream I0 drops to the first electric current I1；
During the temperature is increased to the 5th temperature T5 by third temperature T3, the LED light electric current is controlled by the first electricity
Stream I1 drops to the second electric current I2；
During the temperature drops to the 4th temperature T4 by third temperature T3, controls the LED light electric current and be maintained at
One electric current I1；
During the temperature drops to the first temperature T1 by the 4th temperature T4, the LED light electric current is controlled by the first electricity
Stream I1 restores to initial current I0；
Wherein, T4 is less than T2, and T1 is more than T0, and I2 ratios I0 is the second ratio, and I1 ratios I0 is the first ratio；Second ratio is less than
Or it is equal to first ratio.
2. temprature control method as described in claim 1, which is characterized in that
If the second electric current I2 is less than the first electric current I1, the value range of second ratio is 5%~30%, first ratio
The value range of value is 10%~80%；
If the second electric current I2 is equal to the first electric current I1, the value range of second ratio is 10%~80%, described first
The value range of ratio is 10%~80%.
3. temprature control method as described in claim 1, which is characterized in that the second electric current I2 is equal to the first electric current I1.
4. temprature control method as claimed in claim 3, which is characterized in that third temperature T3 is equal to second temperature T2.
5. temprature control method as claimed in claim 3, which is characterized in that the 4th temperature T4 is equal to the first temperature T1.
6. a kind of LED illumination System, which is characterized in that including a rectifier bridge, an input capacitance, an energy storage inductor, a decompression control
Coremaking piece, a rectifier diode, a load capacitance, a sampling resistor, LED light bead string and one obtain the LED light bead string in real time
Temperature temperature sensor, the rectifier bridge two input termination power, the input capacitance be connected to the rectifier bridge just,
Between negative output terminal, the power pins of the decompression control chip connect the positive and negative output end of the rectifier bridge, the decompression respectively
The driving pin of control chip connects the anode of the rectifier diode, and the current detecting pin of the decompression control chip passes through institute
The negative output terminal that sampling resistor connects the rectifier bridge is stated, the cathode of the rectifier diode connects the positive output end of the rectifier bridge,
In parallel with the rectifier diode after the load capacitance and energy storage inductor series connection, the anode of the LED light bead string meets institute
The positive output end of rectifier bridge is stated, the cathode of the LED light bead string connects the connects end altogether of the load capacitance and the energy storage inductor；Institute
It includes temperature current control module to state decompression control chip, and the temperature current control module is used for：
During the temperature is increased to second temperature T2 by initial temperature T0, the LED light electricity of the LED light bead string is controlled
Stream is initial current I0, wherein initial temperature T0 is the temperature when LED light bead string starts；
During the temperature is increased to third temperature T3 by second temperature T2, the LED light electric current is controlled by initial electricity
Stream I0 drops to the first electric current I1；
During the temperature is increased to the 5th temperature T5 by third temperature T3, the LED light electric current is controlled by the first electricity
Stream I1 drops to the second electric current I2；
During the temperature drops to the 4th temperature T4 by third temperature T3, controls the LED light electric current and be maintained at
One electric current I1；
During the temperature drops to the first temperature T1 by the 4th temperature T4, the LED light electric current is controlled by the first electricity
Stream I1 restores to initial current I0；
Wherein, T4 is less than T2, and T1 is more than T0, and I2 ratios I0 is the second ratio, and I1 ratios I0 is the first ratio；Second ratio is less than
Or it is equal to first ratio.
7. LED illumination System as claimed in claim 6, which is characterized in that the decompression control chip further includes reference voltage
Source, Logic control module, drive module, the first metal-oxide-semiconductor, the lowest point detection module, peak detection block, wherein：
The reference voltage source connect with the power pins of the decompression control chip, described in the drain electrode of first metal-oxide-semiconductor connects
The driving pin of decompression control chip, the source electrode of first metal-oxide-semiconductor connect the current detecting pin of the decompression control chip；
The lowest point detection module is connected between the grid of first metal-oxide-semiconductor and the temperature current control module, according to
The lowest point signal for detecting first metal-oxide-semiconductor is output to the temperature current control module；
The temperature current control module is connected between the lowest point detection module and the Logic control module, according to described
The lowest point signal exports the lowest point delay time signal to the Logic control module；
The peak detection block is connected between the source electrode and the Logic control module of first metal-oxide-semiconductor, described in detection
The peak-current signal of first metal-oxide-semiconductor is exported to the Logic control module；
The drive module is connected between the Logic control module and the grid of first metal-oxide-semiconductor, the drive module
Logic control module drives the first metal-oxide-semiconductor break-make according to the lowest point delay time signal and the peak-current signal.
8. LED illumination System as claimed in claims 6 or 7, which is characterized in that the temperature current control module includes first
Hysteresis comparator, the second hysteresis comparator, a trsanscondutance amplifier, the first divider resistance, the second divider resistance, third partial pressure electricity
Resistance, the 4th divider resistance, the first capacitance, the second capacitance, the first PTAT current source, the second PTAT current source, a constant-current source, one or two
Pole pipe, a zener diode, the second metal-oxide-semiconductor, third metal-oxide-semiconductor, a phase inverter and one and door；
The normal phase input end of first hysteresis comparator meets first PTAT current source, institute by first divider resistance
The anti-phase input for stating the first hysteresis comparator terminates second PTAT current source, the output termination of first hysteresis comparator
The drain electrode of the grid of second metal-oxide-semiconductor, second metal-oxide-semiconductor connects first sluggishness relatively by second divider resistance
The drain electrode of the normal phase input end of device, second metal-oxide-semiconductor is also grounded by the third divider resistance, second metal-oxide-semiconductor
Source electrode is grounded；The normal phase input end of the trsanscondutance amplifier connects first PTAT current source, the reverse phase of the trsanscondutance amplifier
Input terminates the anode of second PTAT current source and the diode, the minus earth of the diode, and the mutual conductance is put
The inverting input of the cathode and second hysteresis comparator of the output termination zener diode of big device, described 4th point
Piezoresistance and first capacitance are in parallel with the zener diode；The normal phase input end of second hysteresis comparator connects described
The drain electrode of constant-current source and the third metal-oxide-semiconductor simultaneously passes through second capacity earth, the input terminal of second hysteresis comparator
Connect the input terminal with door, the input terminal that the phase inverter is terminated with door another input, the output with door
End exports the lowest point delay time signal as the output end of temperature current control module, and the output of the phase inverter terminates described the
The grid of three metal-oxide-semiconductors, the source electrode ground connection that the 2nd MOS is closed, the input terminal of the phase inverter is as temperature current control module
Input terminal access the lowest point detect signal.
9. LED illumination System as claimed in claim 6, which is characterized in that
If the second electric current I2 is less than the first electric current I1, the value range of second ratio is 5%~30%, first ratio
The value range of value is 10%~80%；
If the second electric current I2 is equal to the first electric current I1, the value range of second ratio is 10%~80%, described first
The value range of ratio is 10%~80%.
10. LED illumination System as claimed in claim 6, which is characterized in that
Second electric current I2 is equal to the first electric current I1；Or
Second electric current I2 is equal to the first electric current I1, and third temperature T3 is equal to second temperature T2；Or
Second electric current I2 is equal to the first electric current I1, and the 4th temperature T4 is equal to the first temperature T1.
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