CN103957639A - Temperature compensating circuit used for LED - Google Patents

Temperature compensating circuit used for LED Download PDF

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CN103957639A
CN103957639A CN201410195594.6A CN201410195594A CN103957639A CN 103957639 A CN103957639 A CN 103957639A CN 201410195594 A CN201410195594 A CN 201410195594A CN 103957639 A CN103957639 A CN 103957639A
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module
drain
gate
led
temperature
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CN103957639B (en
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李泽宏
张建刚
吴玉舟
周裕康
汪榕
任敏
张金平
高巍
张波
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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Abstract

The invention relates to the electronic circuit technology, in particular to a temperature compensating circuit used for an LED. The temperature compensating circuit used for the LED comprises a drive module, an LED module and a feedback module, and is characterized by further comprising a temperature setting module, a reference voltage generation module, a temperature sampling module and a logic control module. The input end of the logic control module is respectively connected with the output end of the temperature setting module, the output end of the reference voltage generation module and the output end of the temperature sampling module; the output end of the logic control module is connected with one input end of the drive module; the other input end of the drive module is connected with the feedback module; the output end of the drive module is connected with the input end of the LED module; the input end of the temperature sampling module and the input end of the feedback module are connected with the LED module. The temperature compensating circuit used for the LED has the advantages of being simple in structure and low in cost, the initial temperature of temperature compensation can be set freely, the coefficient for the temperature compensation can also be set, and the temperature compensating circuit used for the LED is especially applicable to the field of temperature compensation circuits driven by the LED.

Description

A kind of temperature-compensation circuit for LED
Technical field
The present invention relates to electronic circuit technology, design specifically a kind of temperature-compensation circuit for LED.
Background technology
LED is a kind of novel lamp source, and heat dissipation problem is that one of them very important aspect, especially high-power LED can produce very serious heat dissipation problem, because LED does not dispel the heat by infrared radiation.
The residing ambient temperature of LED is during higher than trouble free service point temperature, and the in-phase current of LED can exceed place of safety, makes the life-span of LED greatly reduce and may bring damage.Dispel the heat bad, junction temperature is just high, and the life-span is just short, can extend 2 times according to 10 DEG C of life-spans of the every reduction of A Leiniusi rule temperature, so the junction temperature of LED can have influence on the life-span of LED.For high-power LED, power is very high, and heating is a lot, and temperature-compensation circuit is particularly important.
Current temperature protection circuit; mainly to utilize excess temperature to turn-off module; the easy appearance of this technology does not stop heat unlatching and hot shutoff on the one hand; on the other hand; the temperature of the driving chip internal that in this technical scheme, temperature generally refers to; shutoff that can not be promptly and accurately has certain difference with the temperature of LED, so can cause damage to performances such as LED life-spans.
Summary of the invention
To be solved by this invention, be exactly the heat dissipation problem existing for above-mentioned traditional LED, a kind of temperature-compensation circuit for LED has been proposed.
The present invention solves the problems of the technologies described above adopted technical scheme: a kind of temperature-compensation circuit for LED, comprise driver module, LED module and feedback module, it is characterized in that, also comprise Temperature Setting module, reference voltage generation module, temperature sampling module and Logic control module; Wherein, the input of Logic control module is connected with the output of Temperature Setting module, reference voltage generation module and temperature sampling module respectively, and its output is connected with an input of driver module; Another input of driver module is connected with feedback module, the input of its output termination LED module; The input of temperature sampling module is connected respectively LED module with the input of feedback module.
Concrete, described Temperature Setting module comprises that operational amplifier A MP1, PMOS pipe PM1 and PM2, NMOS manage NM1, resistance R 1, R3, R7; Wherein the source electrode of PM1 and PM2 meets power vd D; The drain electrode of PM1 connects the drain electrode of NM1; The in-phase input end of operational amplifier A MP1 connects reference voltage generation module, and its negative-phase input connects the source electrode of NM1, the grid of its output termination NM1; The source electrode of NM1 is by the rear ground connection GND of resistance R 1;
Described temperature sampling module is NTC thermistor; The drain electrode of PM2 is successively by ground connection GND after resistance R 3 and NTC thermistor; The position of NTC thermistor is near LED module, and in parallel with resistance R 7; The position of NTC thermistor near LED module for gathering the heat that LED module when work produces, its do not need with and LED module between be connected, if adopt other temperature sensors, be connected with LED module.
Described Logic control module comprises comparator AMP2, comparator AMP3, comparator AMP4, resistance R 5, R6, inverter, the first cmos transmission gate, the second cmos transmission gate; Wherein, the in-phase input end of comparator AMP2 connects the source electrode of NM2, its negative-phase input connects the in-phase input end of comparator AMP3 by resistance R 4, its negative-phase input is also by ground connection GND after NTC thermistor, the enable signal input of its output termination the first cmos transmission gate, its output is also by connecing the enable signal input of the second cmos transmission gate after inverter; The negative-phase input of comparator AMP3 is by the rear ground connection GND of resistance R 5, and its negative-phase input is and its output interconnection rear by resistance R 6 also, the data-signal input of its output termination the second cmos transmission gate; The output interconnection of the output of the first cmos transmission gate and the second cmos transmission gate; The in-phase input end of the output termination comparator AMP4 of the first cmos transmission gate; ; The negative-phase input of comparator AMP4 connects LED module by feedback module, and its output connects LED module by driver module.
Concrete, described operational amplifier A MP1 comprises PMOS pipe PM3, PM4, PM5, PM6, PM7, PM8, PM9, PM10, PM11, PM12, PM13, NMOS pipe NM2, NM3, NM4, NM5, NM6, NM7, NM8, resistance R 8 and capacitor C 1; Wherein, the source electrode of PM5, PM6, PM7, PM11, PM12, PM13 all meets power vd D; The gate interconnection of PM5, PM6, PM7, PM11; The drain and gate interconnection of PM5, its drain electrode meets external current source I_bias; The drain electrode of PM6 connects the source electrode of PM3 and PM4; The grid of PM3 is the in-phase input end of operational amplifier A MP1, and its drain electrode connects the drain electrode of NM2; The grid of PM4 is the negative-phase input of operational amplifier A MP1, and its drain electrode connects the drain electrode of NM3; The drain and gate interconnection of NM2, its grid connects the grid of NM3, its source ground GND; The source ground GND of NM3; The drain electrode of PM7 connects the source electrode of PM8 and PM9; The grid of PM8 connects the drain electrode of NM3, and its drain electrode connects the drain electrode of NM4; The drain and gate interconnection of NM4, its grid connects the grid of NM7, its source ground GND; The grid of PM9 connects the drain electrode of PM10, and its drain electrode connects the drain electrode of MM5; The drain and gate interconnection of NM5, its grid connects the grid of NM8, its source ground GND; The drain electrode of PM11 connects the source electrode of PM10; The drain electrode of PM10 connects the drain electrode of grid and the NM6 of PM9, and its grid meets reference voltage V _ ref; The drain and gate interconnection of NM6, its source ground GND; The gate interconnection of PM12 and PM13; The grid of PM12 and drain electrode interconnection, its drain electrode connects the drain electrode of NM7; The source ground GND of NM7; The drain electrode of PM13 is successively by connecing the grid of PM8 after capacitor C 1 and resistance R 8; The source ground GND of NM8; The drain electrode of NM8 is connected the output as operational amplifier A MP1 with the drain electrode of PM13.
Concrete, described the first cmos transmission gate is identical with the structure of the second cmos transmission gate, formed by PMOS pipe and NMOS pipe, the drain electrode that the source electrode of PMOS pipe connects MMOS pipe is connected as enable signal input with the source electrode that the drain electrode of PMOS pipe connects NMOS pipe, the grid of NMOS pipe is data-signal input, and the grid of PMOS pipe is output.
Beneficial effect of the present invention is, circuit structure is simple, and cost is lower, the advantage that the initial temperature that also possesses temperature-compensating can be set arbitrarily and the coefficient of temperature-compensating can be set.
Brief description of the drawings
Fig. 1 is the logical construction block diagram of the temperature-compensation circuit driving for LED of the present invention;
Fig. 2 is LED electric current and temperature relation schematic diagram;
Fig. 3 is electric current and temperature relation schematic diagram in conventional solution;
Fig. 4 is the electrical block diagram of embodiment;
Fig. 5 is operation amplifier circuit structural representation in embodiment;
Fig. 6 is the electrical block diagram of cmos transmission gate in embodiment;
Fig. 7 is LED circuit and the temperature relation schematic diagram of embodiment.
Embodiment
Below in conjunction with drawings and Examples, describe technical scheme of the present invention in detail:
As shown in Figure 1, the temperature-compensation circuit driving for LED of the present invention, comprises driver module, LED module and feedback module, it is characterized in that, also comprises Temperature Setting module, reference voltage generation module, temperature sampling module and Logic control module; Wherein, the input of Logic control module is connected with the output of Temperature Setting module, reference voltage generation module and temperature sampling module respectively, and its output is connected with an input of driver module; Another input of driver module is connected with feedback module, the input of its output termination LED module; The input of temperature sampling module is connected respectively LED module with the input of feedback module.
As shown in Figure 2, be LED electric current and temperature relation schematic diagram, when temperature exceedes after a certain critical value, LED electric current will sharply decline as seen.As shown in Figure 3, be electric current and the temperature relation figure of conventional solution.When temperature is during lower than T2, the electric current of LED is constant, and when temperature is during higher than T2, LED electric current sharply declines.In the time that LED temperature drops to T1, drive chip to start working again, LED electric current starts again constant.
Embodiment
As shown in Figure 4, in this example, Temperature Setting module comprises that operational amplifier A MP1, PMOS pipe PM1 and PM2, NMOS manage NM1, resistance R 1, R3, R7; Wherein the source electrode of PM1 and PM2 meets power vd D; The drain electrode of PM1 connects the drain electrode of NM1; The in-phase input end of operational amplifier A MP1 connects reference voltage generation module, and its negative-phase input connects the source electrode of NM1, the grid of its output termination NM1; The source electrode of NM1 is by the rear ground connection GND of resistance R 1;
Described temperature sampling module is NTC thermistor; The drain electrode of PM2 is successively by ground connection GND after resistance R 3 and NTC thermistor; The position of NTC thermistor is near LED module, and in parallel with resistance R 7; The heat of generation while work for gathering LED module near LED module in the position of NTC thermistor, its do not need with and LED module between be connected, if adopt other temperature sensors, be connected with LED module, need to be connected with LED module, as A tie point in Fig. 4.
Described Logic control module comprises comparator AMP2, comparator AMP3, comparator AMP4, resistance R 5, R6, inverter, the first cmos transmission gate, the second cmos transmission gate; Wherein, the in-phase input end of comparator AMP2 connects the source electrode of NM2, its negative-phase input connects the in-phase input end of comparator AMP3 by resistance R 4, its negative-phase input is also by ground connection GND after NTC thermistor, the enable signal input of its output termination the first cmos transmission gate, its output is also by connecing the enable signal input of the second cmos transmission gate after inverter; The negative-phase input of comparator AMP3 is by the rear ground connection GND of resistance R 5, and its negative-phase input is and its output interconnection rear by resistance R 6 also, the data-signal input of its output termination the second cmos transmission gate; The output interconnection of the output of the first cmos transmission gate and the second cmos transmission gate; The in-phase input end of the output termination comparator AMP4 of the first cmos transmission gate; ; The negative-phase input of comparator AMP4 connects LED module by feedback module, and its output connects LED module by driver module.
This routine operation principle is:
Suppose that the breadth length ratio of PM2 and the breadth length ratio of PM1 are K, by the electric current of PM1 be I1. by the electric current of PM2 be I2.
I2＝K*I1
I1＝VREF/R1
Voltage on R1 is V1=I1*R1.Voltage on NTC thermistor is that VNTC=I2* (RNTC*R7)/(RNTC+R7), VREF is the reference voltage that reference voltage generation module produces.The NTC resistance of negative temperature coefficient is
RNTC＝R0*EXP(B*(1/T-1/298))
Wherein, B is that heat sensitive index (material constant of NTC thermistor) R0 refers to the resistance of RNTC thermistor when 25 degrees Celsius (298K), the absolute temperature value representation of the temperature value that T is thermistor.
The initial temperature that R1=K* (R0*EXP (B* (1/Tth-1/298)) * R7)/(R0*EXP (B* (1/Tth-1/298))+R7) Vth is temperature-compensating.Expression formula is dissolved
V1＝VREF
VNTC＝VREF/R1*K*(R0*EXP(B*(1/T-1/298))*R7)/(R0*EXP(B*(1/T-1/298)+R7)
When V1<VNTC, temperature-compensation circuit is not started working, VNTC>V1, and temperature-compensation circuit is started working.
In the time of V1<VNTC, V1 is input to the in-phase end of operational amplifier A MP2, VNTC is input to the negative phase end of operational amplifier A MP2, operational amplifier A MP2 uses as comparator, operational amplifier A MP2 is output as high level, the first transmission gate is started working, the break-even in-phase end that is transferred to AMP4 of voltage VREF producing with reference to voltage generating module, the VFB voltage that feedback module produces is linked into the negative phase end of AMP4, operational amplifier A MP4 is used as comparator, produce PWM Waveform Input to driver module, driver module is with constant current driven LED module.
In the time of V1=VNTC, the initial temperature that temperature is now temperature-compensating.
In the time of V1>VNTC, V1 is input to the in-phase end of operational amplifier A MP2, VNTC is input to the negative phase end of operational amplifier A MP2, operational amplifier A MP2 uses as comparator, and operational amplifier A MP2 is output as low level, and the second transmission gate is started working, by the harmless in-phase end that is transferred to AMP4 of VNTC, the VFB voltage that feedback module produces is linked into the negative phase end of AMP4, and operational amplifier A MP4 is used as comparator, produces PWM Waveform Input to driver module.Along with the rising of LED temperature, voltage drop, PWM ripple is input to driver module, and driver module driving LED module makes to decline by the electric current of LED module, thereby reaches the function of temperature-compensating.
By changing with reference to producing voltage VRFE, PM2 and PM1 breadth length ratio K, resistance R 1, NTC resistance, resistance R 7, just can change the initial temperature of temperature-compensating, change the slope that voltage declines with temperature.
As shown in Figure 5, for this routine operational amplifier A MP1 comprises PMOS pipe PM3, PM4, PM5, PM6, PM7, PM8, PM9, PM10, PM11, PM12, PM13, NMOS pipe NM2, NM3, NM4, NM5, NM6, NM7, NM8, resistance R 8 and capacitor C 1; Wherein, the source electrode of PM5, PM6, PM7, PM11, PM12, PM13 all meets power vd D; The gate interconnection of PM5, PM6, PM7, PM11; The drain and gate interconnection of PM5, its drain electrode meets external current source I_bias; The drain electrode of PM6 connects the source electrode of PM3 and PM4; The grid of PM3 is the in-phase input end of operational amplifier A MP1, and its drain electrode connects the drain electrode of NM2; The grid of PM4 is the negative-phase input of operational amplifier A MP1, and its drain electrode connects the drain electrode of NM3; The drain and gate interconnection of NM2, its grid connects the grid of NM3, its source ground GND; The source ground GND of NM3; The drain electrode of PM7 connects the source electrode of PM8 and PM9; The grid of PM8 connects the drain electrode of NM3, and its drain electrode connects the drain electrode of NM4; The drain and gate interconnection of NM4, its grid connects the grid of NM7, its source ground GND; The grid of PM9 connects the drain electrode of PM10, and its drain electrode connects the drain electrode of MM5; The drain and gate interconnection of NM5, its grid connects the grid of NM8, its source ground GND; The drain electrode of PM11 connects the source electrode of PM10; The drain electrode of PM10 connects the drain electrode of grid and the NM6 of PM9, and its grid meets reference voltage V _ ref; The drain and gate interconnection of NM6, its source ground GND; The gate interconnection of PM12 and PM13; The grid of PM12 and drain electrode interconnection, its drain electrode connects the drain electrode of NM7; The source ground GND of NM7; The drain electrode of PM13 is successively by connecing the grid of PM8 after capacitor C 1 and resistance R 8; The source ground GND of NM8; The drain electrode of NM8 is connected the output as operational amplifier A MP1 with the drain electrode of PM13.This example adopts the high gain operational amplifier of low imbalance, can ensure the sensitivity of circuit reaction, reduces error.
As shown in Figure 6, the first cmos transmission gate is identical with the structure of the second cmos transmission gate, formed by PMOS pipe and NMOS pipe, the drain electrode that the source electrode of PMOS pipe connects MMOS pipe is connected as enable signal input with the source electrode that the drain electrode of PMOS pipe connects NMOS pipe, the grid of NMOS pipe is data-signal input, and the grid of PMOS pipe is output.
As shown in Figure 7, for the LED electric current of this routine temperature-compensation circuit and the graph of a relation of temperature, along with the rising of temperature, the electric current of LED is reducing, thereby reaches the object of temperature-compensating.
In sum, the temperature-compensation circuit that a kind of LED of the present invention drives, comprises the modules such as reference voltage generation module, Logic control module, driver module, LED module, Temperature Setting module, temperature sampling module, feedback module.By the initial temperature of Temperature Setting module design temperature compensation.VREF is the reference voltage that reference voltage generation module produces.Reference voltage generation module, Temperature Setting module and temperature sampling module are input to Logic control module, the output of Logic control module and feedback module output to driver module, driver module is with constant current driven LED module.The electric current of feedback module sampling LED feeds back VFB with voltage form.Other circuit of the present invention can be to be realized by integrated circuit, and structure is simple, and cost is extremely low, can well solve LED heating problem, extends the life-span of LED.

Claims (4)

1.一种用于LED的温度补偿电路，包括驱动模块、LED模块和反馈模块，其特征在于，还包括温度设定模块、参考电压产生模块、温度采样模块和逻辑控制模块；其中，逻辑控制模块的输入端分别与温度设定模块、参考电压产生模块和温度采样模块的输出端连接，其输出端与驱动模块的一个输入端连接；驱动模块的另一个输入与反馈模块连接，其输出端接LED模块的输入端；温度采样模块的输入端和反馈模块的输入端分别连接LED模块。1. A temperature compensation circuit for LEDs, comprising a drive module, an LED module and a feedback module, characterized in that it also includes a temperature setting module, a reference voltage generation module, a temperature sampling module and a logic control module; wherein the logic control The input terminal of the module is connected with the output terminal of the temperature setting module, the reference voltage generation module and the temperature sampling module respectively, and its output terminal is connected with one input terminal of the drive module; the other input terminal of the drive module is connected with the feedback module, and its output terminal connected to the input terminal of the LED module; the input terminal of the temperature sampling module and the input terminal of the feedback module are respectively connected to the LED module. 2.根据权利要求1所述的一种用于LED的温度补偿电路，其特征在于，所述温度设定模块包括运算放大器AMP1、PMOS管PM1和PM2、NMOS管NM1、电阻R1、R3、R7；其中PM1和PM2的源极接电源VDD，；PM1的漏极接NM1的漏极；运算放大器AMP1的同相输入端接参考电压产生模块，其负相输入端接NM1的源极，其输出端接NM1的栅极；NM1的源极通过电阻R1后接地GND；2. A temperature compensation circuit for LED according to claim 1, wherein the temperature setting module comprises operational amplifier AMP1, PMOS transistors PM1 and PM2, NMOS transistor NM1, resistors R1, R3, R7 ; wherein the sources of PM1 and PM2 are connected to the power supply VDD; the drain of PM1 is connected to the drain of NM1; the non-inverting input terminal of the operational amplifier AMP1 is connected to the reference voltage generation module, and its negative input terminal is connected to the source of NM1, and its output terminal Connect to the gate of NM1; the source of NM1 is grounded to GND after passing through resistor R1; 所述温度采样模块为NTC热敏电阻；PM2的漏极依次通过电阻R3和NTC热敏电阻后接地GND；NTC热敏电阻的位置靠近LED模块，并与电阻R7并联；The temperature sampling module is an NTC thermistor; the drain of PM2 is grounded to GND after passing through the resistor R3 and the NTC thermistor in turn; the NTC thermistor is located close to the LED module and connected in parallel with the resistor R7; 所述逻辑控制模块包括比较器AMP2、比较器AMP3、比较器AMP4、电阻R5、R6、反相器、第一CMOS传输门、第二CMOS传输门；其中，比较器AMP2的同相输入端接NM2的源极，其负相输入端通过电阻R4接比较器AMP3的同相输入端，其负相输入端还通过NTC热敏电阻后接地GND，其输出端接第一CMOS传输门的使能信号输入端，其输出端还通过反相器后接第二CMOS传输门的使能信号输入端；比较器AMP3的负相输入端通过电阻R5后接地GND，其负相输入端还通过电阻R6后与其输出端互连，其输出端接第二CMOS传输门的数据信号输入端；第一CMOS传输门的输出端和第二CMOS传输门的输出端互连；第一CMOS传输门的输出端接比较器AMP4的同相输入端；；比较器AMP4的负相输入端通过反馈模块接LED模块，其输出端通过驱动模块接LED模块。The logic control module includes a comparator AMP2, a comparator AMP3, a comparator AMP4, resistors R5, R6, an inverter, a first CMOS transmission gate, and a second CMOS transmission gate; wherein, the non-inverting input terminal of the comparator AMP2 is connected to NM2 The source, its negative phase input terminal is connected to the non-inverting input terminal of comparator AMP3 through resistor R4, its negative phase input terminal is also grounded to GND after passing through the NTC thermistor, and its output terminal is connected to the enable signal input of the first CMOS transmission gate terminal, its output terminal is also connected to the enable signal input terminal of the second CMOS transmission gate through the inverter; the negative phase input terminal of the comparator AMP3 is grounded to GND after passing through the resistor R5, and its negative phase input terminal is connected to the GND after passing through the resistor R6 The output terminals are interconnected, and its output terminal is connected to the data signal input terminal of the second CMOS transmission gate; the output terminal of the first CMOS transmission gate is interconnected with the output terminal of the second CMOS transmission gate; the output terminal of the first CMOS transmission gate is connected to the comparison The noninverting input terminal of the comparator AMP4; the negative input terminal of the comparator AMP4 is connected to the LED module through the feedback module, and its output terminal is connected to the LED module through the driving module. 3.根据权利要求2所述的一种用于LED的温度补偿电路，其特征在于，所述运算放大器AMP1包括PMOS管PM3、PM4、PM5、PM6、PM7、PM8、PM9、PM10、PM11、PM12、PM13、NMOS管NM2、NM3、NM4、NM5、NM6、NM7、NM8、电阻R8和电容C1；其中，PM5、PM6、PM7、PM11、PM12、PM13的源极均接电源VDD；PM5、PM6、PM7、PM11的栅极互连；PM5的漏极和栅极互连，其漏极接外部电流源I_bias；PM6的漏极接PM3和PM4的源极；PM3的栅极为运算放大器AMP1的同相输入端，其漏极接NM2的漏极；PM4的栅极为运算放大器AMP1的负相输入端，其漏极接NM3的漏极；NM2的漏极和栅极互连，其栅极接NM3的栅极，其源极接地GND；NM3的源极接地GND；PM7的漏极接PM8和PM9的源极；PM8的栅极接NM3的漏极，其漏极接NM4的漏极；NM4的漏极和栅极互连，其栅极接NM7的栅极，其源极接地GND；PM9的栅极接PM10的漏极，其漏极接MM5的漏极；NM5的漏极和栅极互连，其栅极接NM8的栅极，其源极接地GND；PM11的漏极接PM10的源极；PM10的漏极接PM9的栅极和NM6的漏极，其栅极接基准电压V_ref；NM6的漏极和栅极互连，其源极接地GND；PM12和PM13的栅极互连；PM12的栅极和漏极互连，其漏极接NM7的漏极；NM7的源极接地GND；PM13的漏极依次通过电容C1和电阻R8后接PM8的栅极；NM8的源极接地GND；NM8的漏极和PM13的漏极连接作为运算放大器AMP1的输出端。3. A temperature compensation circuit for LED according to claim 2, wherein the operational amplifier AMP1 includes PMOS tubes PM3, PM4, PM5, PM6, PM7, PM8, PM9, PM10, PM11, PM12 , PM13, NMOS transistors NM2, NM3, NM4, NM5, NM6, NM7, NM8, resistor R8, and capacitor C1; among them, the sources of PM5, PM6, PM7, PM11, PM12, and PM13 are all connected to the power supply VDD; PM5, PM6, The gates of PM7 and PM11 are interconnected; the drain and gate of PM5 are interconnected, and the drain is connected to the external current source I_bias; the drain of PM6 is connected to the source of PM3 and PM4; the gate of PM3 is the non-inverting input of the operational amplifier AMP1 terminal, its drain is connected to the drain of NM2; the gate of PM4 is the negative phase input terminal of the operational amplifier AMP1, and its drain is connected to the drain of NM3; the drain and gate of NM2 are interconnected, and its gate is connected to the gate of NM3 The source of NM3 is grounded to GND; the drain of PM7 is connected to the source of PM8 and PM9; the gate of PM8 is connected to the drain of NM3, and its drain is connected to the drain of NM4; the drain of NM4 It is interconnected with the gate, its gate is connected to the gate of NM7, and its source is grounded to GND; the gate of PM9 is connected to the drain of PM10, and its drain is connected to the drain of MM5; the drain and gate of NM5 are interconnected, Its gate is connected to the gate of NM8, and its source is grounded to GND; the drain of PM11 is connected to the source of PM10; the drain of PM10 is connected to the gate of PM9 and the drain of NM6, and its gate is connected to the reference voltage V_ref; The drain and gate are interconnected, and the source is grounded to GND; the gates of PM12 and PM13 are interconnected; the gate and drain of PM12 are interconnected, and the drain is connected to the drain of NM7; the source of NM7 is grounded to GND; PM13 The drain of NM8 is connected to the gate of PM8 through capacitor C1 and resistor R8 in turn; the source of NM8 is grounded to GND; the drain of NM8 is connected to the drain of PM13 as the output terminal of operational amplifier AMP1. 4.根据权利要求3所述的一种用于LED的温度补偿电路，其特征在于，所述第一CMOS传输门和第二CMOS传输门的结构相同，由PMOS管和NMOS管构成，PMOS管的源极接MMOS管的漏极与PMOS管的漏极接NMOS管的源极相连作为使能信号输入端，NMOS管的栅极为数据信号输入端，PMOS管的栅极为输出端。4. A temperature compensation circuit for LED according to claim 3, characterized in that, the first CMOS transmission gate and the second CMOS transmission gate have the same structure, and are composed of a PMOS transistor and an NMOS transistor, and the PMOS transistor The source of the MMOS tube is connected to the drain of the PMOS tube and the source of the NMOS tube is connected as an enable signal input end, the grid of the NMOS tube is a data signal input end, and the grid of the PMOS tube is an output end.
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