CN202979366U - Temperature control type pwm linear constant current led drive circuit - Google Patents
Temperature control type pwm linear constant current led drive circuit Download PDFInfo
- Publication number
- CN202979366U CN202979366U CN 201220545386 CN201220545386U CN202979366U CN 202979366 U CN202979366 U CN 202979366U CN 201220545386 CN201220545386 CN 201220545386 CN 201220545386 U CN201220545386 U CN 201220545386U CN 202979366 U CN202979366 U CN 202979366U
- Authority
- CN
- China
- Prior art keywords
- circuit
- resistance
- electrically connected
- constant current
- drive circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Images
Landscapes
- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The utility model discloses a temperature control type PWM linear constant current LED drive circuit, which belongs to the field of power supply drive circuits. The temperature control type PWM linear constant current LED drive circuit comprises an AC (alternating current) input end, a rectifier bridge circuit, a drive circuit and an LED lamp group. The drive circuit comprises a linear amplification circuit, a PWM signal generation circuit, and a temperature sensor circuit for controlling the frequency duty ratio of the PWM signal generation circuit. The input end of the linear amplification circuit is electrically connected with the rectifier bridge circuit. The output end of the linear amplification circuit is connected with the LED lamp group. The PWM signal generation circuit is connected with the control end of the linear amplification circuit. The temperature sensor circuit is electrically connected with the PWM signal generation circuit. Compared with a conventional linear constant current circuit, the temperature control type PWM linear constant current LED drive circuit which adopts both the linear amplification circuit and the PWM signal generation circuit for a controlling purpose can effectively save the cost, alleviate circuit heating, effectively enhance temperature control performances, sensitivity regulation and control performances and constant current regulation and control performances, and further effectively prolong the service lifetimes of LED lamps. The temperature control type PWM linear constant current LED drive circuit has good practicality.
Description
Technical field
The utility model belongs to the power driving circuit field, is specifically related to the linear constant current LED drive circuit of a kind of temperature control type PWM.
Background technology
Incandescent lamp in conventional art becomes heat energy with a large amount of electric energy conversions, efficiency is lower, though and the fluorescent lamp efficiency improve, but still lower, unsatisfactory, and its look relatively poor and environmental pollution, adjusting is not easy, designing a kind of constant current LED drive circuit is those skilled in the art's technical issues that need to address.
The utility model content
The purpose of this utility model provides a kind of highly sensitive, long service life, constant current is effective and temperature control performance is good linear constant current LED drive circuit of temperature control type PWM regulated.
the technical scheme that realizes the utility model purpose is the linear constant current LED drive circuit of a kind of temperature control type PWM, comprise the alternating current input, the rectifier circuit that is connected with the alternating current input, the drive circuit that is connected with the rectifier circuit output and the LED lamp group that is connected with the drive circuit output, described drive circuit comprises linear amplifier circuit, pwm signal circuit for generating and be used for to control the temperature sensor circuit of the frequency duty ratio of pwm signal circuit for generating, the input of described linear amplifier circuit is electrically connected to described rectifier circuit, described linear amplifier circuit output is connected with described LED lamp group, described pwm signal circuit for generating is connected with the control end of described linear amplifier circuit, described temperature sensor circuit is electrically connected to described pwm signal circuit for generating.
Described pwm signal circuit for generating also comprises the power-switching circuit that alternating current is converted into the micropower electricity.
described linear amplifier circuit comprises the first triode, the second triode, the first resistance, the second resistance, the 3rd resistance and photoelectrical coupler, the collector electrode of the collector electrode of described the first triode and the second triode is connected with LED lamp group after being electrically connected to, described LED lamp group is connected electrically on the positive pole of rectifier circuit, the emitter of described the first triode is connected electrically on the negative pole of rectifier circuit through the first resistance, the emitter of described the second triode is electrically connected to the base stage of described the first triode, the inferior limit input of described photoelectrical coupler is connected electrically on the positive pole of described rectifier circuit through described the second resistance, the output on the inferior limit of described photoelectrical coupler is electrically connected to the base stage of described the second triode and an end of the 3rd resistance, the other end of described the 3rd resistance is connected with the negative electricity of described rectifier circuit, the first limit of described photoelectrical coupler is electrically connected to described pwm signal circuit for generating.
described pwm signal circuit for generating comprises the NE555 chip, the 4th resistance, the 5th resistance, the 6th resistance, the 3rd electric capacity and the 4th electric capacity, the signal output part of described NE555 chip is electrically connected to the first limit input of described photoelectrical coupler, described just limit output is electrically connected to through the ground terminal of the 4th resistance with described NE555 chip, the control end of described NE555 chip is electrically connected to described ground terminal through described the 4th electric capacity, the power end of described NE555 chip is electrically connected to described power-switching circuit, and the power end of NE555 chip is successively through the 5th resistance, the 6th resistance and the 3rd electric capacity are electrically connected to the ground terminal of described NE555 chip, the discharge end of described NE555 chip is connected electrically between the 5th resistance and institute's six resistance, described temperature sensor circuit comprises semistor, and described semistor and described the 6th resistance are in parallel.
Described power-switching circuit comprises the first electric capacity, the 7th resistance, unilateral diode, voltage stabilizing didoe and the second electric capacity, described the first electric capacity and described the 7th resistance are in parallel and an end is connected electrically in ac input end, the other end is electrically connected on voltage stabilizing didoe and on the positive pole of unilateral diode, and the negative pole of described unilateral diode is electrically connected to the power end of NE555 chip after through the second capacitor filtering.
Described ac input end is provided with fuse.
the utlity model has positive effect: the linear constant current LED drive circuit of temperature control type PWM of the present utility model is compared with traditional linear constant current circuit, adopt linear amplifier circuit to control with the mode that the pwm signal circuit for generating combines, the loss of the minimizing triode that can imitate, improved the efficient of power supply, and can effectively save cost, reduce the heating of circuit, improved safety and reliability of the present utility model, be provided with temperature sensor circuit, directly carry out controlling of sampling for the temperature of lamp body, can effectively improve temperature-control performance, sensitivity performance of control and constant current performance of control, due to whole circuit caloric value seldom, can effectively extend the LED light fixture arranged useful life, practicality is good.
Description of drawings
For content of the present utility model is more likely to be clearly understood, the below is described in further detail the utility model according to specific embodiment also by reference to the accompanying drawings, wherein:
Fig. 1 is circuit theory schematic diagram of the present utility model;
Fig. 2 is physical circuit figure of the present utility model.
Embodiment
(embodiment 1)
Fig. 1 and Fig. 2 have shown a kind of embodiment of the present utility model, and wherein Fig. 1 is circuit theory schematic diagram of the present utility model; Fig. 2 is physical circuit figure of the present utility model.
see Fig. 1 and Fig. 2, the linear constant current LED drive circuit of a kind of temperature control type PWM, comprise alternating current input 1, the rectifier circuit 2 that is connected with alternating current input 1, the drive circuit 3 that is connected with rectifier circuit 2 outputs and the LED lamp group 4 that is connected with drive circuit 3 outputs, drive circuit 3 comprises linear amplifier circuit 31, pwm signal circuit for generating 32 and be used for to control the temperature sensor circuit 33 of the frequency duty ratio of pwm signal circuit for generating, the input of linear amplifier circuit 31 is electrically connected to rectifier circuit 2, linear amplifier circuit 31 outputs are connected with LED lamp group 4, pwm signal circuit for generating 32 is connected with the control end of linear amplifier circuit 31, temperature sensor circuit 33 is electrically connected to pwm signal circuit for generating 32.
Pwm signal circuit for generating 32 also comprises the power-switching circuit 34 that alternating current is converted into the micropower electricity.
pwm signal circuit for generating 32 comprises NE555 chip U2, the 4th resistance R 4, the 5th resistance R 5, the 6th resistance R 6, the 3rd capacitor C 3 and the 4th capacitor C 4, the signal output part of NE555 chip U2 is electrically connected to the first limit input of photoelectrical coupler U1, just the limit output is electrically connected to through the ground terminal of the 4th resistance R 4 with NE555 chip U2, the control end of NE555 chip U2 is electrically connected to ground terminal through the 4th capacitor C 4, the power end of NE555 chip U2 is electrically connected to power-switching circuit 34, and the power end of NE555 chip U2 is successively through the 5th resistance R 5, the 6th resistance R 6 and the 3rd capacitor C 3 are electrically connected to the ground terminal of NE555 chip U2, the discharge end of NE555 chip U2 is connected electrically between the 5th resistance R 5 and institute's six resistance R 6, temperature sensor circuit 33 comprises semistor RT, and semistor RT and the 6th resistance R 6 are in parallel.
Power-switching circuit 34 comprises the first capacitor C 1, the 7th resistance R 7, unilateral diode D1, voltage stabilizing didoe D2 and the second capacitor C 2, the first capacitor C 1 and the 7th resistance R 7 are in parallel and an end is connected electrically in ac input end, the other end is electrically connected on the positive pole of the upper and unilateral diode D1 of voltage stabilizing didoe D2, and the negative pole of unilateral diode D1 is electrically connected to the power end of NE555 chip U2 after through the second capacitor C 2 filtering.
Ac input end 1 is provided with fuse FU.
its operation principle is summarized as follows: the 220V alternating current becomes the Rectified alternating current of 100Hz after rectifier bridge, one the tunnel through the LED serializer circuit, Q1 and R1 consist of the loop, another road is through R2, U1 limit and R3 provide bias voltage for Q2, when input voltage rises to the total voltage value of LED string, the LED lamp begins luminous, at this moment, the multiple tube that Q1 and Q2 consist of is operated in linear condition, connected in biasing circuit due to Q2 on the inferior marginal ray fulgurite of photoelectrical coupler U1, the conducting degree of photoelectric tube is controlled by the luminous intensity of the light-emitting diode of U1 inside, time-base circuit consists of the pwm signal circuit for generating and pwm signal is added on the base stage of Q2 by U1, Q1 and Q2 also are operated on off state simultaneously thus, frequency and the duty ratio of pwm signal circuit for generating depend on R6, RT, the value of R5 and C3, R6 wherein, R5, the value of C3 is changeless, and the resistance of thermistor is temperature variant, when its plate of LED or radiator temperature variation, the change in resistance of thermistor causes the duty ratio respective change of the frequency of pwm signal, thereby control Q1, Q2 opens or opening time, the regulation output average current, reach the purpose of constant current, simultaneously, the 220V alternating current is through the C1 step-down, provide little merit charging source for the pwm signal circuit for generating after D1 rectification C2 filtering and D2 voltage stabilizing.
Obviously, above-described embodiment of the present utility model is only for the utility model example clearly is described, and is not to be restriction to execution mode of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give all execution modes exhaustive.And these belong to apparent variation or the change that connotation of the present utility model extends out and still belong to protection range of the present utility model.
Claims (6)
1. the linear constant current LED drive circuit of a temperature control type PWM, comprise the alternating current input, the rectifier circuit that is connected with the alternating current input, the drive circuit that is connected with the rectifier circuit output and the LED lamp group that is connected with the drive circuit output, it is characterized in that: described drive circuit comprises linear amplifier circuit, pwm signal circuit for generating and be used for to control the temperature sensor circuit of the frequency duty ratio of pwm signal circuit for generating, the input of described linear amplifier circuit is electrically connected to described rectifier circuit, described linear amplifier circuit output is connected with described LED lamp group, described pwm signal circuit for generating is connected with the control end of described linear amplifier circuit, described temperature sensor circuit is electrically connected to described pwm signal circuit for generating.
2. the linear constant current LED drive circuit of temperature control type PWM according to claim 1, it is characterized in that: described pwm signal circuit for generating also comprises the power-switching circuit that alternating current is converted into the micropower electricity.
3. the linear constant current LED drive circuit of temperature control type PWM according to claim 2, it is characterized in that: described linear amplifier circuit comprises the first triode, the second triode, the first resistance, the second resistance, the 3rd resistance and photoelectrical coupler, the collector electrode of the collector electrode of described the first triode and the second triode is connected with LED lamp group after being electrically connected to, described LED lamp group is connected electrically on the positive pole of rectifier circuit, the emitter of described the first triode is connected electrically on the negative pole of rectifier circuit through the first resistance, the emitter of described the second triode is electrically connected to the base stage of described the first triode, the inferior limit input of described photoelectrical coupler is connected electrically on the positive pole of described rectifier circuit through described the second resistance, the output on the inferior limit of described photoelectrical coupler is electrically connected to the base stage of described the second triode and an end of the 3rd resistance, the other end of described the 3rd resistance is connected with the negative electricity of described rectifier circuit, the first limit of described photoelectrical coupler is electrically connected to described pwm signal circuit for generating.
4. the linear constant current LED drive circuit of temperature control type PWM according to claim 3, it is characterized in that: described pwm signal circuit for generating comprises the NE555 chip, the 4th resistance, the 5th resistance, the 6th resistance, the 3rd electric capacity and the 4th electric capacity, the signal output part of described NE555 chip is electrically connected to the first limit input of described photoelectrical coupler, described just limit output is electrically connected to through the ground terminal of the 4th resistance with described NE555 chip, the control end of described NE555 chip is electrically connected to described ground terminal through described the 4th electric capacity, the power end of described NE555 chip is electrically connected to described power-switching circuit, and the power end of NE555 chip is successively through the 5th resistance, the 6th resistance and the 3rd electric capacity are electrically connected to the ground terminal of described NE555 chip, the discharge end of described NE555 chip is connected electrically between the 5th resistance and institute's six resistance, described temperature sensor circuit comprises semistor, and described semistor and described the 6th resistance are in parallel.
5. the linear constant current LED drive circuit of temperature control type PWM according to claim 4, it is characterized in that: described power-switching circuit comprises the first electric capacity, the 7th resistance, unilateral diode, voltage stabilizing didoe and the second electric capacity, described the first electric capacity and described the 7th resistance are in parallel and an end is connected electrically in ac input end, the other end is electrically connected on voltage stabilizing didoe and on the positive pole of unilateral diode, and the negative pole of described unilateral diode is electrically connected to the power end of NE555 chip after through the second capacitor filtering.
6. the linear constant current LED drive circuit of temperature control type PWM according to claim 5, it is characterized in that: described ac input end is provided with fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220545386 CN202979366U (en) | 2012-10-19 | 2012-10-19 | Temperature control type pwm linear constant current led drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220545386 CN202979366U (en) | 2012-10-19 | 2012-10-19 | Temperature control type pwm linear constant current led drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202979366U true CN202979366U (en) | 2013-06-05 |
Family
ID=48520381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220545386 Withdrawn - After Issue CN202979366U (en) | 2012-10-19 | 2012-10-19 | Temperature control type pwm linear constant current led drive circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202979366U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103002635A (en) * | 2012-10-19 | 2013-03-27 | 木林森股份有限公司 | Temperature-control PWM (pulse width modulation) linear constant-current LED driving circuit |
| CN105963863A (en) * | 2016-06-01 | 2016-09-28 | 王咏梅 | Physiotherapy equipment closed loop control system |
-
2012
- 2012-10-19 CN CN 201220545386 patent/CN202979366U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103002635A (en) * | 2012-10-19 | 2013-03-27 | 木林森股份有限公司 | Temperature-control PWM (pulse width modulation) linear constant-current LED driving circuit |
| CN103002635B (en) * | 2012-10-19 | 2015-03-04 | 木林森股份有限公司 | Temperature-control PWM (pulse width modulation) linear constant-current LED driving circuit |
| CN105963863A (en) * | 2016-06-01 | 2016-09-28 | 王咏梅 | Physiotherapy equipment closed loop control system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103491682A (en) | Linear switching constant-current LED drive circuit for control over peak current | |
| CN201274590Y (en) | LED driving apparatus using commercial power | |
| CN204465954U (en) | A kind of LED lamp drive circuit with dimming function | |
| CN101532635B (en) | Solar power driving large-power LED lighting lamp of microcomputer | |
| CN201203034Y (en) | Microcomputer solar electric power generation drive high power LED lighting lamp | |
| CN102510605B (en) | Novel LED (light emitting diode) driving circuit and drive method | |
| CN202738171U (en) | Light-adjustable LED drive circuit | |
| CN202979366U (en) | Temperature control type pwm linear constant current led drive circuit | |
| CN201170458Y (en) | Microcomputer DC multipurpose high-power LED illumination energy-saving lamp | |
| CN202551459U (en) | LED (Light Emitting Diode) driving power supply module for silicon controlled regulating circuit | |
| CN201706379U (en) | Solar photoelectric integrated light power supply | |
| CN103002635B (en) | Temperature-control PWM (pulse width modulation) linear constant-current LED driving circuit | |
| CN203734880U (en) | High voltage integration AC LED multistage linear drive device | |
| CN104132265A (en) | LED module with hotspot conversion unit | |
| CN212361869U (en) | Lighting device based on thermoelectric generation | |
| CN202634773U (en) | Human body sensing LED lamp | |
| CN203151799U (en) | LED infrared automatic induction lamp | |
| CN202679701U (en) | Novel LED drive circuit | |
| CN202503717U (en) | Solar energy light-operated light emitting diode array lamp capable of automatic turning on and off | |
| CN202652650U (en) | Hybrid integrated LED constant-current power circuit | |
| CN102056379A (en) | Solar high-power LED indoor life lighting system | |
| CN207065461U (en) | A kind of LED car lamp with temperature pre-warning defencive function | |
| CN205648119U (en) | LED (Light emitting diode) driving power | |
| CN204114617U (en) | Be provided with the LED module of focus conversion unit | |
| CN204994032U (en) | LED microelectronics energy -conserving light that gives out light; give off light |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130605 Effective date of abandoning: 20150311 |
|
| RGAV | Abandon patent right to avoid regrant |