CN103957639A - Temperature compensating circuit used for LED - Google Patents

Temperature compensating circuit used for LED Download PDF

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Publication number
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 electrode
connects
grid
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. for a temperature-compensation circuit of 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.
2. a kind of temperature-compensation circuit for LED according to claim 1, is characterized in that, 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;
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.
3. a kind of temperature-compensation circuit for LED according to claim 2, it is characterized in that, 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.
4. a kind of temperature-compensation circuit for LED according to claim 3, it is characterized in that, 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.
CN201410195594.6A 2014-05-09 2014-05-09 A kind of temperature-compensation circuit for LED Expired - Fee Related CN103957639B (en)

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Publication number Priority date Publication date Assignee Title
CN108076554A (en) * 2016-11-10 2018-05-25 华润矽威科技(上海)有限公司 Reference voltage declines initial temperature point conditioned circuit and LED constant current driving power chip
CN108646844A (en) * 2018-05-31 2018-10-12 上海矽润科技有限公司 A kind of temperature-compensation circuit, temperature-compensation method
CN109640437A (en) * 2018-12-07 2019-04-16 苏州纽克斯电源技术股份有限公司 A kind of LED dimming control system
CN110320952A (en) * 2019-07-22 2019-10-11 苏州欧普照明有限公司 A kind of thermal-shutdown circuit and system

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CN103281835A (en) * 2013-06-06 2013-09-04 东莞博用电子科技有限公司 LED over-temperature protection circuit applied to alternative current LED drive system
CN103458554A (en) * 2012-05-30 2013-12-18 海洋王照明科技股份有限公司 LED drive circuit and LED lamp

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US20080224634A1 (en) * 2006-06-28 2008-09-18 Patent-Treuhand-Gesellschaft Fur Elektrische Glulampen Mbh LED circuit with current control
US20120268015A1 (en) * 2011-04-20 2012-10-25 National Chi Nan University Light power compensation device, light power compensation circuit, and detecting module
CN103458554A (en) * 2012-05-30 2013-12-18 海洋王照明科技股份有限公司 LED drive circuit and LED lamp
CN103281835A (en) * 2013-06-06 2013-09-04 东莞博用电子科技有限公司 LED over-temperature protection circuit applied to alternative current LED drive system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108076554A (en) * 2016-11-10 2018-05-25 华润矽威科技(上海)有限公司 Reference voltage declines initial temperature point conditioned circuit and LED constant current driving power chip
CN108076554B (en) * 2016-11-10 2019-08-23 华润矽威科技(上海)有限公司 Reference voltage declines initial temperature point conditioned circuit and LED constant current driving power chip
CN108646844A (en) * 2018-05-31 2018-10-12 上海矽润科技有限公司 A kind of temperature-compensation circuit, temperature-compensation method
CN109640437A (en) * 2018-12-07 2019-04-16 苏州纽克斯电源技术股份有限公司 A kind of LED dimming control system
CN110320952A (en) * 2019-07-22 2019-10-11 苏州欧普照明有限公司 A kind of thermal-shutdown circuit and system
CN110320952B (en) * 2019-07-22 2024-05-31 苏州欧普照明有限公司 Over-temperature protection circuit and system

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