CN203467003U - Linear constant-current LED drive circuit - Google Patents
Linear constant-current LED drive circuit Download PDFInfo
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- CN203467003U CN203467003U CN201320374316.8U CN201320374316U CN203467003U CN 203467003 U CN203467003 U CN 203467003U CN 201320374316 U CN201320374316 U CN 201320374316U CN 203467003 U CN203467003 U CN 203467003U
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- voltage stabilizing
- stabilizing didoe
- triode
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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Abstract
The utility model discloses a linear constant-current LED drive circuit which comprises a rectifier bridge, a filtering capacitor C1, voltage stabilizing diodes DZ, light emitting diodes and a linear constant current source circuit, wherein the input end of the rectifier bridge is connected in series to an alternating-current power supply through a fuse, the output end of the rectifier bridge is connected in series with the light emitting diodes and the linear constant current source circuit, each voltage stabilizing diode DZ is connected in parallel with the corresponding light emitting diode, the cathodes of the voltage stabilizing diodes DZ are connected to the anodes of the light emitting diodes, and the anodes of the voltage stabilizing diodes DZ are connected to the cathodes of the light emitting diodes. By designing the linear constant current source circuit, the voltage across the two ends of an LED is maintained to be basically stable, the junction temperature of the LED is low within a long time period, the junction temperature of a single LED is basically unchanged or slightly changed, and the purposes of ensuring stable and low junction temperature of the LED, reducing light attenuation and effectively improving the service life of an LED fluorescent lamp are achieved.
Description
Technical field
The utility model relates to LED Driving technique field, particularly, relates to a kind of linear constant current LED drive circuit.
Background technology
LED is cold light source, and operating voltage is low, light efficiency is high, is considered to the new light sources of 21 century illumination.Yet the key issue that LED lighting apparatus is not generalizable at present has two. the one, on the high side; The 2nd, the unstable LED of the causing life-span of control circuit reduces greatly.According to statistics, the failure of removal that LED white-light illuminating light fixture occurs at present, 70% left and right is power issue, 20% left and right is circuit and structure problem. less than 10%, be only the quality problems of LED single tube own.
Electrology characteristic from LE D, the mean forward current of LED is along with the increase of forward voltage presents significantly linear growth, the tiny change of LED its forward voltage after forward conduction will cause the great changes of LED electric current, and electric current is very large on the impact of LED junction temperature, excessive electric current is easy to cause LED lamp pearl junction temperature to raise and damages.In addition, by the known increase along with forward current of optical characteristics of LED, LED luminous flux increases thereupon, i.e. brightness increases.Therefore in order to keep the constant of LED luminosity, will guarantee the stable of LED forward current.
Utility model content
The purpose of this utility model is, for the problems referred to above, proposes a kind of linear constant current LED drive circuit, to realize, guarantees that the junction temperature of LED is stable and less, reduces light decay, effectively improves the advantage in the useful life of LED fluorescent lamp.
For achieving the above object, the technical solution adopted in the utility model is:
A kind of linear constant current LED drive circuit, comprise rectifier bridge, filter capacitor C1, voltage stabilizing didoe DZ, light-emitting diode, Linear CCS circuit, the input of described rectifier bridge is connected in AC power by fuse, output series connection light-emitting diode and the Linear CCS circuit of described rectifier bridge, described voltage stabilizing didoe DZ is in parallel with light-emitting diode, the cathodic electricity of this voltage stabilizing didoe DZ is connected on the anode of light-emitting diode, the anode of this voltage stabilizing didoe DZ is connected electrically on the negative electrode of light-emitting diode, described Linear CCS circuit is by resistance R 1, resistance R 2, triode Q1, triode Q2, voltage stabilizing didoe D5 and voltage stabilizing didoe D6 form, the collector electrode of described triode Q1 is connected electrically in the base stage of triode Q2, the base stage of described triode Q1 is connected electrically on the collector electrode of triode Q2, series resistance R1 and voltage stabilizing didoe D5 between the emitter of described triode Q1 and base stage, the anode series of described voltage stabilizing didoe D5 is associated in the base stage of triode Q1, the negative electrode of this voltage stabilizing didoe D5 and resistance R 1 series connection, series resistance R2 and voltage stabilizing didoe D6 between the emitter of described triode Q2 and base stage, the anode series of described voltage stabilizing didoe D6 is associated in resistance R 2, the negative electrode of this voltage stabilizing didoe D6 is connected in the base stage of triode Q2.
Further, the number of described voltage stabilizing didoe DZ and light-emitting diode is N, and each light-emitting diode voltage stabilizing didoe DZ separately in parallel.
Further, it is the voltage stabilizing didoe that MMBT5401 and rated voltage are 3.0V that described voltage stabilizing didoe DZ adopts model, the number N=93 of described light-emitting diode.
Further, the resistance of described resistance R 1 is 130 Ω, the resistance of described resistance R 2 is 130 Ω, the model of described triode Q1 is SDT85509, the model of described triode Q2 is SDT85509, the model of described voltage stabilizing didoe D5 is that 1N4749 and rated voltage are 140V, and the model of described voltage stabilizing didoe D6 is that 1N4749 and rated voltage are 140V.
Further, the input power of described rectifier bridge adopts civil power.
The technical solution of the utility model has following beneficial effect:
The technical solution of the utility model, by designing a kind of Linear CCS circuit, the voltage at LED two ends is remained unchanged substantially, and LED junction temperature is low in long-time section, the substantially constant or minor variations of single led junction temperature, reach and guarantee that the junction temperature of LED is stable and less, reduce light decay, effectively improve the object in the useful life of LED fluorescent lamp.
Accompanying drawing explanation
Fig. 1 is the linear constant current LED drive circuit electrical circuit diagram described in the utility model embodiment mono-;
Fig. 2 is the linear constant current LED drive circuit electrical circuit diagram described in the utility model embodiment bis-;
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present utility model is described, should be appreciated that preferred embodiment described herein is only for description and interpretation the utility model, and be not used in restriction the utility model.
Embodiment mono-:
As shown in Figure 1, a kind of linear constant current LED drive circuit, comprise rectifier bridge, filter capacitor C1, voltage stabilizing didoe DZ, light-emitting diode, Linear CCS circuit, the input of rectifier bridge is connected in AC power by fuse, output series connection light-emitting diode and the Linear CCS circuit of rectifier bridge, voltage stabilizing didoe DZ is in parallel with light-emitting diode, the cathodic electricity of this voltage stabilizing didoe DZ is connected on the anode of light-emitting diode, the anode of this voltage stabilizing didoe DZ is connected electrically on the negative electrode of light-emitting diode, Linear CCS circuit is by resistance R 1, resistance R 2, triode Q1, triode Q2, voltage stabilizing didoe D5 and voltage stabilizing didoe D6 form, the collector electrode of described triode Q1 is connected electrically in the base stage of triode Q2, the base stage of triode Q1 is connected electrically on the collector electrode of triode Q2, series resistance R1 and voltage stabilizing didoe D5 between the emitter of triode Q1 and base stage, the anode series of voltage stabilizing didoe D5 is associated in the base stage of triode Q1, the negative electrode of this voltage stabilizing didoe D5 and resistance R 1 series connection, series resistance R2 and voltage stabilizing didoe D6 between the emitter of triode Q2 and base stage, the anode series of voltage stabilizing didoe D6 is associated in resistance R 2, the negative electrode of this voltage stabilizing didoe D6 is connected in the base stage of triode Q2.
Embodiment bis-:
As shown in Figure 2, on the basis of embodiment mono-, the number of voltage stabilizing didoe DZ and light-emitting diode is set as to N, and each light-emitting diode voltage stabilizing didoe DZ separately in parallel.
On the basis of embodiment bis-, it is the voltage stabilizing didoe that MMBT5401 and rated voltage are 3.0V that voltage stabilizing didoe DZ adopts model, the number N=93 of light-emitting diode.The resistance of resistance R 1 is 130 Ω, the resistance of resistance R 2 is 130 Ω, and the model of triode Q1 is SDT85509, and the model of triode Q2 is SDT85509, the model of voltage stabilizing didoe D5 is that 1N4749 and rated voltage are 140V, and the model of voltage stabilizing didoe D6 is that 1N4749 and rated voltage are 140V.The input power of rectifier bridge adopts civil power.
Linear constant current LED drive circuit is in the constant-current drive circuit of complementary constant-current circuit application LED, and this circuit is in the situation that input 200-250 V changes, and drive current variations is only 1.5 mA, and LED junction temperature is lower than 37 ℃.Can provide a good condition of work for LED.In normal mains-supplied situation, (220 V) has very high power-efficient.
Resistance R 1, resistance R 2, triode Q1, triode Q2, voltage stabilizing didoe D5 and voltage stabilizing didoe D6 form Linear CCS, and the electric current that it has guaranteed to flow through every white light LEDs is identical, obtains uniform brightness.LED driving power adopts the direct rectifying and wave-filtering of civil power. the direct-current working volts of controlled LED, and without boosting or step-down processing.Therefore power driving circuit is succinct, and power-efficient is high.
Finally it should be noted that: the foregoing is only preferred embodiment of the present utility model, be not limited to the utility model, although the utility model is had been described in detail with reference to previous embodiment, for a person skilled in the art, its technical scheme that still can record aforementioned each embodiment is modified, or part technical characterictic is wherein equal to replacement.All within spirit of the present utility model and principle, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection range of the present utility model.
Claims (5)
1. a linear constant current LED drive circuit, it is characterized in that, comprise rectifier bridge, filter capacitor C1, voltage stabilizing didoe DZ, light-emitting diode, Linear CCS circuit, the input of described rectifier bridge is connected in AC power by fuse, output series connection light-emitting diode and the Linear CCS circuit of described rectifier bridge, described voltage stabilizing didoe DZ is in parallel with light-emitting diode, the cathodic electricity of this voltage stabilizing didoe DZ is connected on the anode of light-emitting diode, the anode of this voltage stabilizing didoe DZ is connected electrically on the negative electrode of light-emitting diode, described Linear CCS circuit is by resistance R 1, resistance R 2, triode Q1, triode Q2, voltage stabilizing didoe D5 and voltage stabilizing didoe D6 form, the collector electrode of described triode Q1 is connected electrically in the base stage of triode Q2, the base stage of described triode Q1 is connected electrically on the collector electrode of triode Q2, series resistance R1 and voltage stabilizing didoe D5 between the emitter of described triode Q1 and base stage, the anode series of described voltage stabilizing didoe D5 is associated in the base stage of triode Q1, the negative electrode of this voltage stabilizing didoe D5 and resistance R 1 series connection, series resistance R2 and voltage stabilizing didoe D6 between the emitter of described triode Q2 and base stage, the anode series of described voltage stabilizing didoe D6 is associated in resistance R 2, the negative electrode of this voltage stabilizing didoe D6 is connected in the base stage of triode Q2.
2. linear constant current LED drive circuit according to claim 1, is characterized in that, the number of described voltage stabilizing didoe DZ and light-emitting diode is N, and each light-emitting diode voltage stabilizing didoe DZ separately in parallel.
3. linear constant current LED drive circuit according to claim 2, is characterized in that, it is the voltage stabilizing didoe that MMBT5401 and rated voltage are 3.0V that described voltage stabilizing didoe DZ adopts model, the number N=93 of described light-emitting diode.
4. linear constant current LED drive circuit according to claim 2, it is characterized in that, the resistance of described resistance R 1 is 130 Ω, the resistance of described resistance R 2 is 130 Ω, the model of described triode Q1 is SDT85509, the model of described triode Q2 is SDT85509, and the model of described voltage stabilizing didoe D5 is that 1N4749 and rated voltage are 140V, and the model of described voltage stabilizing didoe D6 is that 1N4749 and rated voltage are 140V.
5. linear constant current LED drive circuit according to claim 2, is characterized in that, the input power of described rectifier bridge adopts civil power.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320374316.8U CN203467003U (en) | 2013-06-27 | 2013-06-27 | Linear constant-current LED drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320374316.8U CN203467003U (en) | 2013-06-27 | 2013-06-27 | Linear constant-current LED drive circuit |
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| Publication Number | Publication Date |
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| CN203467003U true CN203467003U (en) | 2014-03-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320374316.8U Expired - Lifetime CN203467003U (en) | 2013-06-27 | 2013-06-27 | Linear constant-current LED drive circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106061011A (en) * | 2016-06-02 | 2016-10-26 | 北京印刷学院 | Light emitting diode (LED) constant current remote lighting communication system |
| CN110837269A (en) * | 2019-10-09 | 2020-02-25 | 广州邦讯信息***有限公司 | Multi-output constant voltage circuit and voltage-stabilized power supply |
-
2013
- 2013-06-27 CN CN201320374316.8U patent/CN203467003U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106061011A (en) * | 2016-06-02 | 2016-10-26 | 北京印刷学院 | Light emitting diode (LED) constant current remote lighting communication system |
| CN110837269A (en) * | 2019-10-09 | 2020-02-25 | 广州邦讯信息***有限公司 | Multi-output constant voltage circuit and voltage-stabilized power supply |
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Granted publication date: 20140305 |
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| CX01 | Expiry of patent term |