CN101969726B - LED driving loop - Google Patents
LED driving loop Download PDFInfo
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- CN101969726B CN101969726B CN 201010509381 CN201010509381A CN101969726B CN 101969726 B CN101969726 B CN 101969726B CN 201010509381 CN201010509381 CN 201010509381 CN 201010509381 A CN201010509381 A CN 201010509381A CN 101969726 B CN101969726 B CN 101969726B
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Abstract
The invention provides an LED driving loop. The driving loop can work under a low voltage and is not be affected by various interferences caused by installing place and the surrounding environment; the driving loop has small driving current and can stably work when the temperature is changed and can adjust the glaze. The driving loop for LED is characterized by comprising a driving part (for providing power and driving one or a plurality of LED arrays Ln formed by serially connecting one or more LEDs) and a control part, wherein the control part comprises a resistor Rs1 and Rs2 and a temperature correction mechanism part which includes a transistor Tc; the collector of the transistor and the base electrode are connected with an Rc2; the base electrode and the emitter are connected with an Rc1; through adjusting the ratio of the Rc1 and R2, the transistor Tc is combined with one part and the thermal combining degree is adjusted; the temperature of the driving loop is set to an expected property.
Description
Technical field
The present invention relates to the LED lighting device that a kind of LED drives the loop and uses this driving loop.
Background technology
Along with the raising of the progressive luminous efficiency of the appearance of off-white color LED, technology, the lighting source that uses LED more can improve energy efficiency than the light source of white heat electric light in the past commonly used, has done a lot of trials for the LED lighting device of small-sized thin body carries out commercialization now.But LED is different from the light source take the white heat electric light as representative in the past, because be semiconductor, during the temperature that in suppressing running, rises, not only want sufficient by the electric current of LED, will stablize in the time of also will working as temperature, variation in voltage, and in rated range, will set current value.For with the high efficiency of LED as feature, efficient must be higher than traditional lighting, so when improving LED self luminous efficiency, need to ask power supply, drive the low loss in loop etc.On the other hand, thus since LED to be that semiconductor exists electric, the property difference of optics aspect, just use iff the quality of judging product, each product can produce the difference of briliancy and tone.
Therefore now characteristic that can tight screening LED optics or be substituted into LED after pre-assembled after adjust briliancy and tone makes its deviation not too obvious, can cause because production is low, the product original cost significantly rises but do like this, although guaranteed performance, be called the high price product.Also can see although omitted the low price product of screening and set-up procedure, the briliancy of these products and tone have very large deviation or have the problems such as quality.
As the method for eliminating above problem, the deviation of considering to lower by the LED with a plurality of small amount outputs its briliancy and tone is arranged, but realize stablizing and do one's utmost to lower the current value deviation, the driving method that again drive division is moved under alap voltage exists very large problem.
The driving loop of contrast patent documentation 1 (Unexamined Patent 11-29804 communique) can suppress the difference of the drive current of a plurality of LED, and can guarantee the brightness identical with fluorescent tube light source at least near normal temperature the temperature of normal use () time.But in this method, voltage between each the transistorized base stage～emitter that is used for driving and the difference of emitter resistance can cause error (such error is sure existence), because each transistorized base stage of using is interconnective, so transistorized base potential is determined by potential minimum wherein, this potential minimum value is: base stage～emission electrode potential+emitter resistance * with the minimum value in the value of emitter current value → calculate, so, the drive current of every row LED is just different, briliancy is also just different, when a driving is broken with transistor generation obstacle or LED row, can affect the driving current value of whole LED, the briliancy of whole LED is declined to a great extent, and, also be difficult to significantly adjust the briliancy of ligthing paraphernalia.
Summary of the invention
The purpose of this invention is to provide a kind of LED of making drive division operates under low-voltage, and do not allow to be subject to the various impacts that installation site or surrounding environment cause, drive current difference is little, even variations in temperature also can be stablized running, even the infringements such as broken string occur in a part that drives with transistor or LED row, also seldom affect the action of other LED row, can drive a plurality of LED row that significantly to adjust briliancy.
For achieving the above object, the technical solution used in the present invention is:
A kind of LED drives the loop, it is characterized in that: described driving loop is used for driving the one or more LED row that are in series by one or more LED, this driving loop comprises drive division and control part, described drive division provides electric current for the LED that driving is connected to above-mentioned row, described control part possesses the 1st resistance, the 2nd resistance and temperature Corrective function section, there is transistor in temperature Corrective function section, this transistorized collector electrode is connected to an end of the 1st resistance, emitter is connected to an end of the 2nd resistance, be connected the 3rd resistance between transistorized collector electrode and the base stage, be connected the 4th resistance between base stage and the emitter, by the flow through current value of drive division of the value adjustment of adjusting the 1st resistance and the 2nd resistance, it is right to change the transistorized thermojunction of temperature Corrective function section by the ratio of adjusting the 3rd resistance and the 4th resistance, temperature dependency is set as the characteristic of expectation.
The LED that the used LED of this lighting device possesses record in the claim 1 drives the loop.
The present invention is with respect to prior art, and its beneficial effect is:
1, the present invention can reduce briliancy difference, the color distortion that LED driving loop system causes, and can adjust briliancy.
2, the present invention can simply reduce the past in a plurality of series LED lighting devices briliancy difference that the difference owing to the LED drive current of appearance causes when throwing light on, the problem of color distortion.
Even 3, the part broken string equivalent damage of driving transistors or LED row occurs in the present invention, the driving current value of other LED row can significantly not reduce yet, and so just can greatly reduce the impact on other LED row, and this also is not realize in the prior art.
Description of drawings
Accompanying drawing is the circuit diagram that LED of the present invention drives the loop.
Among the figure, the 1--control part, the 2--drive division, 3--temperature Corrective function section, and the Ln--LED row (n:1～n), the Ren--emitter resistance (n:1～n), the Rbn--base resistance (n:1～n), the Tn--transistor (n:1～n), Ref1--emitter resistance, Tef1--emitter-follower transistor, Rs1--resistance, Rs2--resistance, Rc1--resistance, Rc2--resistance, the Tc--transistor, the Vs--LED current value is set and is used power supply, Vsc--control part emitter follower power supply, Vled--LED power supply.
Embodiment
Below in conjunction with accompanying drawing most preferred embodiment of the present invention is further described.
Accompanying drawing is the schematic diagram that LED drives the loop in the most preferred embodiment of the present invention, the function that this LED drives the loop is divided into one or several series LED row Ln (n:1～n) (end connects power supply Vled, and the other end connects the drive division 2 that drives each LED row Ln) and this LED drive division 2 of control and the control part 1 of controlling current value.
Drive division 2 is by n transistor T n (n:1～n) form, transistorized collector electrode { k * n the LED} that be used for to drive that k (k is the natural number more than 1), n row (n is the natural number more than 1) by series connection form and LED row Ln (n:1～n) link to each other, emitter and Ren (n:1～n) link to each other, base stage and Rbn (n:1～n) link to each other.
The magnitude of voltage that electric current when the value of resistance R en is considered each transistor T n driving LED of drive division produces at the resistance two ends is set, the value of resistance R b1～Rbn is to consider the base stage that reduces transistor T n, the impact of the difference between the emitter, also consider and set after the situation that LED row n that the fault, transistor of above-mentioned transistor T n connect breaks down, resistance value is preferably higher, like this, even the obstacles such as LED row n generation broken string that transistor T n obstacle occurs or links to each other with transistor T n also can significantly reduce other transistorized impacts.
The end that has in addition of resistance R b1～Rbn connects the emitter of the transistor T ef1 of emitter follower, and this emitter has resistance R ef1, is the output of control part 1.Control part 1 is made of emitter follower, emitter follower is comprised of the transistor T ef1 of resistance R ef1 Rs1, temperature Corrective function section 3, Rs2, emitter, Rs2 is resistance R s1 and temperature Corrective function with voltage Vs dividing potential drop, the dividing potential drop output of Rs1 is connected with the base stage of transistor T ef1, temperature Corrective function section 3 and resistance R s2 series connection, one end links to each other with Rs1, and the other end links to each other with the OV of the power supply Vs that setting LED current value is used.
Temperature Corrective function section 3 is comprised of transistor T c, Rc1 (being connected between this transistorized base stage～emitter) and Rc2 (being connected between collector electrode～base stage).The collector electrode of this transistor T c links to each other with the base stage of Tef1, and the emitter of this transistor T c links to each other with resistance R s2, and the collector electrode of transistor T ef1 links to each other with power supply Vsc.
By ratio or the value that changes voltage Vs that changes resistance R s1 and Rs2 or the value that changes Rs1 or Rs2, the current value of the transistor T n of the LED drive division of flowing through can be adjusted to desired value.Ratio by adjusting Rc1 and Rc2, the transistor T c that the temperature revisal is used be combined, regulate the degree of this thermal with the somewhere, can be made as the temperature characterisitic of driving loop integral body positive and negative or zero.
Like this, by temperature Corrective function 3 is built in the control part 1, the temperature dependency of the electric current of the LED row L1～Ln that flows through just can be made as (along with the rising of temperature, the current value of LED of flowing through increases), zero (no matter whether temperature rises, the current value of LED of flowing through is constant), negative (along with temperature rises, the current value of the LED that flows through reduces).
Among the present invention, the control part 1 of setting the LED current value of flowing through only has a place, owing to only control drive division 2 with control part 1 one places, so the current value difference of the LED that flows through is little, can reduce luminance difference and colour-difference that the difference of the electric current of the LED that flows through causes.In addition, increase and decrease as required the quantity of drive division 2, can reduce the difference in the drive division, and in the situation of using identical control part 1, the LED number of increase and decrease LED columns or increase and decrease series connection.
More than come the situation of drive division transistor T 1～Tn to be illustrated for the transistor T ef1 with the emitter follower of one section formation, but it is many to work as the required electric current of drive division transistor T 1～Tn, in one section situation that can go wrong when driving of emitter follower, the multistage that the emitter follower in early stage can be made more than two sections connects.
The order of connection of Rs1, temperature Corrective function section 3, Rs2 also can be Rs1, Rs2, temperature Corrective function section 3.In the latter case, the base stage of the transistor T ef1 of emitter follower links to each other with the tie point of Rs1, temperature Corrective function section 3.
Owing to will change the value of ratio or change Rs1 or the Rs2 of Rs1 and Rs2, so can use without fixed resistance variable resistor, carry out trickleer adjustment.
What more than enumerate only is most preferred embodiment framework of the present invention, and all distortion that those of ordinary skill in the art can directly derive or associate from content disclosed by the invention all should be thought protection scope of the present invention.
Claims (2)
1. a LED drives the loop, it is characterized in that: described driving loop is used for driving the one or more LED row that are in series by one or more LED, this driving loop comprises drive division and control part, described drive division provides electric current for the LED that driving is connected to above-mentioned row, described control part possesses the 1st resistance, the 2nd resistance and temperature Corrective function section, there is transistor in temperature Corrective function section, this transistorized collector electrode is connected to an end of the 1st resistance, emitter is connected to an end of the 2nd resistance, be connected the 3rd resistance between transistorized collector electrode and the base stage, be connected the 4th resistance between base stage and the emitter, by the flow through current value of drive division of the value adjustment of adjusting the 1st resistance and the 2nd resistance, it is right to change the transistorized thermojunction of temperature Corrective function section by the ratio of adjusting the 3rd resistance and the 4th resistance, temperature dependency is set as the characteristic of expectation.
2. LED lighting device is characterized in that: the LED that the used LED of this lighting device possesses record in the claim 1 drives the loop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010509381 CN101969726B (en) | 2010-10-15 | 2010-10-15 | LED driving loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010509381 CN101969726B (en) | 2010-10-15 | 2010-10-15 | LED driving loop |
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| Publication Number | Publication Date |
|---|---|
| CN101969726A CN101969726A (en) | 2011-02-09 |
| CN101969726B true CN101969726B (en) | 2013-10-30 |
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| CN 201010509381 Expired - Fee Related CN101969726B (en) | 2010-10-15 | 2010-10-15 | LED driving loop |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101189736A (en) * | 2005-06-02 | 2008-05-28 | 皇家飞利浦电子股份有限公司 | LED assembly and module |
| CN101247688A (en) * | 2007-02-13 | 2008-08-20 | 飞思卡尔半导体公司 | Method and device for setting work current of luminous semiconductor element |
-
2010
- 2010-10-15 CN CN 201010509381 patent/CN101969726B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101189736A (en) * | 2005-06-02 | 2008-05-28 | 皇家飞利浦电子股份有限公司 | LED assembly and module |
| CN101247688A (en) * | 2007-02-13 | 2008-08-20 | 飞思卡尔半导体公司 | Method and device for setting work current of luminous semiconductor element |
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| Publication number | Publication date |
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| CN101969726A (en) | 2011-02-09 |
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