CN201674698U - Multicore LED integrated drive circuit - Google Patents
Multicore LED integrated drive circuit Download PDFInfo
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- CN201674698U CN201674698U CN2010202036607U CN201020203660U CN201674698U CN 201674698 U CN201674698 U CN 201674698U CN 2010202036607 U CN2010202036607 U CN 2010202036607U CN 201020203660 U CN201020203660 U CN 201020203660U CN 201674698 U CN201674698 U CN 201674698U
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Abstract
The utility model discloses a multicore LED integrated drive circuit comprising a rectification circuit and an LED circuit formed by N LED chips which are connected in series, wherein two input ends of the rectification circuit are connected with mains supply; the output positive end of the rectification circuit is connected with the input end of the LED circuit; the integrated drive circuit also comprises a tail-end constant-current circuit; and the input end of the tail-end constant-current circuit is connected with the output end of the LED circuit, and the output end thereof is connected with the output negative end of the rectification circuit. The multicore LED integrated drive circuit integrates the LED circuit and a drive circuit, reduces the using amount of electronic devices, and has the advantages of high work efficiency, simple structure, low power consumption and low cost.
Description
Technical field
The utility model relates to a kind of LED (Light Emitting Diode, light-emitting diode) device, specifically, is a kind of multicore LED integrated drive electronics.
Background technology
When adopting LED as the backlight of display or other lighting apparatus, need carry out constant-current driving to it, purpose is to exceed maximum rating for fear of drive current, influence the reliability and the fail safe of device, simultaneously also be LED display requirement, and guarantee the consistency of aspects such as each LED brightness and colourity in order to obtain to expect.
At present, led light source is usually with integrated encapsulation after a plurality of led chip connection in series-parallel, and provides driving power by independent external drive system.This class driving power design is complicated, volume is big and radiating effect is poor, especially this class driving power adopts electrolytic capacitor to carry out filtering, because the rising of the life-span of electrolytic capacitor along with temperature descends very fast, therefore making traditional drive circuit be difficult to long-term stability works reliably, far can not mate the useful life of LED its useful life, hindered the development of LED Lighting Industry.
The utility model content
At the deficiencies in the prior art, the purpose of this utility model is the multicore LED integrated drive electronics that a kind of simple in structure, stable performance will be provided.
For this reason, the utility model provides a kind of multicore LED integrated drive electronics, comprise rectification circuit and the led circuit that is in series by N led chip, two inputs of rectification circuit connect civil power, the output plus terminal of rectification circuit connects the input of led circuit, also comprise terminal constant-current circuit, the input of terminal constant-current circuit connects the output of led circuit, and the output of terminal constant-current circuit connects the output negative terminal of rectification circuit.The led chip operating current that can guarantee each LED that is connected in series equates, thereby has guaranteed that overall brightness is even.Terminal constant-current circuit is used to led circuit that stable operating current is provided, and improves the reliability of service behaviour.
According to an aspect of the present utility model, terminal constant-current circuit comprises first triode, second triode and comparator, the collector electrode of first triode is connected with the output of led circuit, the base stage of first triode connects the positive pole of last LED of led circuit by the first transistor base resistance, the base stage of first triode also is connected with the collector electrode of second triode, the emitter of first triode is connected with the in-phase input end of comparator, the emitter of first triode is also connected and is connected with the output negative terminal of rectification circuit behind the first triode emitting stage resistance, the inverting input of comparator is connected with reference voltage source, and reference voltage source also is connected with the emitter of second triode.The comparator of terminal constant-current circuit can in time compare the output after the constant current with reference voltage source, adjust the working condition of triode in real time, guarantees that constant current stablizes, the feedback constant current accuracy improves, energy consumption is low, and working stability has greatly reduced electromagnetic radiation and interference simultaneously.
According to another aspect of the present utility model; this multicore LED integrated drive electronics also comprises protective circuit, and protective circuit comprises that the voltage transient that is connected across between two inputs of rectification circuit suppresses diode and the thermistor that is connected on input of rectification circuit.This protective circuit is used to guarantee that LED is operated in the normal voltage scope, avoids damaging because of abnormal voltage causes electronic device.
Compared with prior art, the beneficial effects of the utility model are: this multicore LED integrated drive electronics becomes one led circuit and drive circuit, reduce the electronic device that uses, had high efficiency, advantage simple in structure, low in energy consumption, with low cost.Owing to do not use electrolytic capacitor in the circuit, make drive circuit and LED life-span be complementary, improved the useful life and the stability of circuit.
Description of drawings
Above-mentioned and/or additional aspect of the utility model and advantage are from obviously and easily understanding becoming the description of embodiment below in conjunction with accompanying drawing, wherein:
Fig. 1 is the circuit theory diagrams of multicore LED integrated drive electronics of the present utility model.
Embodiment
Describe embodiment of the present utility model below in detail, the example of described embodiment is shown in the drawings, and wherein identical from start to finish or similar label is represented identical or similar device or the device with identical or similar functions.Below by the embodiment that is described with reference to the drawings is exemplary, only is used to explain the utility model, and can not be interpreted as restriction of the present utility model.
Shown in Fig. 1 is the circuit structure of multicore LED integrated drive electronics of the present utility model.This multicore LED integrated drive electronics comprises rectification circuit 30 and the led circuit 10 that is in series by N led chip, and two inputs of rectification circuit 30 connect civil power, and the output plus terminal of rectification circuit 30 connects the input of led circuit 10.Rectification circuit 30 can be the bridge rectifier of being made up of 4 diode D1, D2, D3 and D4, and the 220V alternating current is carried out rectification.In led circuit 10, N high-power LED chip is connected in series and can carries out dividing potential drop to the civil power after the rectification and be in the normal operating voltage range to guarantee each LED, can guarantee that also the operating current of each LED equates, thereby guarantee that overall brightness is even.This multicore LED integrated drive electronics also comprises terminal constant-current circuit 20, and the input of terminal constant-current circuit 20 connects the output of led circuit 10, and the output of terminal constant-current circuit 20 connects the output negative terminal of rectification circuit 30.Terminal constant-current circuit 20 is used to led circuit 10 that stable operating current is provided, and improves the reliability of service behaviour.
Terminal constant-current circuit 20 comprises the first triode Q1, the second triode Q2 and comparator A, the collector electrode of the first triode Q1 is connected with the output of led circuit 10, the base stage of the first triode Q1 connects the positive pole of position, the end LED of led circuit 10 by the first transistor base resistance R B1, the base stage of the first triode Q1 also is connected with the collector electrode of the second triode Q2 simultaneously, the emitter of the first triode Q1 is connected with the in-phase input end of comparator A, also by being connected with the output negative terminal of rectification circuit 30 behind the series connection first transistor emitter resistance R E1, the inverting input of comparator A is connected with reference voltage source U, and reference voltage source U also is connected with the emitter of the second triode Q2.The second triode Q2 can also be provided with diode D6 and oppositely be connected diode D7 between collector electrode and the emitter at collector electrode.
Terminal constant-current circuit 20 extracts voltage difference as the voltage difference between the first triode Q1 collector electrode and the base stage from the both positive and negative polarity of position, end LED, comparator A can export the electric current after the constant current in time and reference voltage source U compares, adjust the working condition of the second triode Q2 in real time to guarantee the constant of the first triode Q1 base voltage according to current conditions, thereby guarantee current constant through first transistor emitter resistance R E1 output, terminal constant-current circuit 20 adopts linear constant current, constant current accuracy improves, energy consumption is low, working stability has greatly reduced electromagnetic radiation and interference simultaneously.Owing to adopt 1.2V reference voltage source U to make that the energy that consumes on the first transistor emitter resistance R E1 and the first triode Q1 is very low, therefore can make the constant-current system power consumption very low, generate heat seldom, this external first triode Q1 emitter is provided with feedback can make constant current accuracy improve.In this circuit, adopt the good device of temperature coefficient, make this multicore LED integrated drive electronics not need temperature-compensated structure, so service behaviour is highly stable.
This multicore LED integrated drive electronics also comprises the protective circuit 40 that is arranged at rectification circuit 30 inputs, and protective circuit 40 comprises that the voltage transient that is connected across between 30 two inputs of rectification circuit suppresses diode D5 and the thermistor R1 that is connected on 30 1 inputs of rectification circuit.This protective circuit 40 is used to guarantee that LED is operated in the normal voltage scope, avoids damaging because of abnormal voltage causes electronic device.Particularly; thermistor R1 adopts the thermistor of positive temperature coefficient; diode D5 adopts the voltage transient inhibitor of 270V; thermistor R1 and voltage transient suppress diode D5 and are connected to become protective circuit 40; if because of certain abnormal cause makes voltage raise; diode D5 reverse-conducting when voltage is elevated to the threshold value of diode D5, and the resistance of thermistor R1 is risen, thus make operating voltage remain in the normal range of operation of this drive circuit.
This multicore LED integrated drive electronics is because the electronic device that uses reduces, and simple in structure, cost significantly reduces.Do not use electrolytic capacitor in the circuit, avoided, make the life-span of circuit and reliability all improve greatly because of of the influence of electrolytic capacitor decreased performance to the entire circuit service behaviour.Because drive circuit simplifies greatly, area occupied is very little, can realize that the microelectronics of driving power is integrated.Entire circuit adopts linear constant current, does not need oscillating circuit, and electromagnetic interference and radiation all reduce greatly.In addition, because electronic device quantity reduces, the electric energy that consumes on electronic device also significantly reduces, make the power supply transformation efficiency obviously improve, found through experiments, when alternating current during at 230V ± 10%, the power supply transformation efficiency of this multicore LED integrated drive electronics can be up to 98%.
The above only is a preferred implementation of the present utility model; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the utility model principle; can also make some improvements and modifications, these improvements and modifications also should be considered as protection range of the present utility model.
Claims (3)
1. multicore LED integrated drive electronics, the led circuit (10) that comprises rectification circuit (30) and be in series by N led chip, two inputs of described rectification circuit (30) connect civil power, the output plus terminal of described rectification circuit (30) connects the input of described led circuit (10), it is characterized in that, also comprise terminal constant-current circuit (20), the input of described terminal constant-current circuit (20) connects the output of described led circuit (10), and the output of described terminal constant-current circuit (20) connects the output negative terminal of described rectification circuit (30).
2. multicore LED integrated drive electronics according to claim 1, it is characterized in that, described terminal constant-current circuit (20) comprises first triode (Q1), second triode (Q2) and comparator (A), the collector electrode of described first triode (Q1) is connected with the output of described led circuit (10), the base stage of described first triode (Q1) connects the positive pole of position, the end LED of described led circuit (10) by the first transistor base resistance (RB1), the base stage of described first triode (Q1) also is connected with the collector electrode of described second triode (Q2), the emitter of described first triode (Q1) is connected with the in-phase input end of described comparator (A), the emitter of described first triode (Q1) is also connected, and the first triode emitting stage resistance (RE1) is back to be connected with the output negative terminal of described rectification circuit (30), the inverting input of described comparator (A) is connected with reference voltage source (U), and described reference voltage source (U) also is connected with the emitter of described second triode (Q2).
3. multicore LED integrated drive electronics according to claim 1; it is characterized in that; also comprise protective circuit (40), described protective circuit (40) comprises that the voltage transient that is connected across between (30) two inputs of described rectification circuit suppresses diode (D5) and is connected on temperature-sensitive electricity positive (R1) on (30) inputs of described rectification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202036607U CN201674698U (en) | 2010-05-26 | 2010-05-26 | Multicore LED integrated drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202036607U CN201674698U (en) | 2010-05-26 | 2010-05-26 | Multicore LED integrated drive circuit |
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| Publication Number | Publication Date |
|---|---|
| CN201674698U true CN201674698U (en) | 2010-12-15 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202036607U Expired - Fee Related CN201674698U (en) | 2010-05-26 | 2010-05-26 | Multicore LED integrated drive circuit |
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| Country | Link |
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| CN (1) | CN201674698U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711331A (en) * | 2012-06-12 | 2012-10-03 | 中山市山沃照明有限公司 | LED drive power supply |
-
2010
- 2010-05-26 CN CN2010202036607U patent/CN201674698U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102711331A (en) * | 2012-06-12 | 2012-10-03 | 中山市山沃照明有限公司 | LED drive power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: WU QIANPING Free format text: FORMER OWNER: CHONGQING XINSHUGUANG ELECTRONIC TECHNOLOGY CO., LTD. Effective date: 20110531 |
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| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 402560 FEILONG 1ST ROAD, INDUSTRIAL PARK, TONGLIANG COUNTY, CHONGQING CITY TO: 615000 NO. 2, JIANSHE MIDDLE ROAD, XICHANG CITY, SICHUAN PROVINCE |
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| TR01 | Transfer of patent right |
Effective date of registration: 20110531 Address after: 615000 Construction No. 2 middle road, Sichuan, Xichang Patentee after: Wu Qianping Address before: 402560, Feilong Road, Tongliang Industrial Park, Chongqing, 1 Patentee before: Chongqing XinShuGuang Electronic Technology Co., Ltd. |
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| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101215 Termination date: 20120526 |