CN101106852B - Current constant and light adjusting control circuit for luminescent LED array - Google Patents
Current constant and light adjusting control circuit for luminescent LED array Download PDFInfo
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- CN101106852B CN101106852B CN200710049362XA CN200710049362A CN101106852B CN 101106852 B CN101106852 B CN 101106852B CN 200710049362X A CN200710049362X A CN 200710049362XA CN 200710049362 A CN200710049362 A CN 200710049362A CN 101106852 B CN101106852 B CN 101106852B
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Abstract
A constant current and light regulating control circuit of light emitting diodes array for lighting is characterized in that the light emitting diodes array for lighting is formed by at least two lighting sub-circuits in parallel connection, each lighting sub-circuit is formed by at least two light emitting diodes in series connection. The constant current and light regulating control circuit includes a power supply circuit, a control voltage generation circuit, and a constant current light regulating circuit array. The constant current light regulating circuit array includes control sub-circuits at the same number as lighting sub-circuits in the light emitting diodes array for lighting, each control sub-circuit is formed by a triode and a current feedback resistor in series connection, collector of triode in each control sub-circuit is connected with cathode of the last diode in the correspondent lighting sub-circuit in the light emitting diodes array for lighting, and triode base electrodes in the control sub-circuits are connected in parallel to form a control point for the light emitting diodes array for lighting. Output terminal of the control voltage generation circuit is connected with control input terminal of the constant current light regulating circuits array to provide stable control voltage for the constant current light regulating circuits array.
Description
Technical field
The invention belongs to the constant current and the adjusting control circuit of LED for illumination (be called for short LED), particularly a kind of constant current and adjusting control circuit of the diode array that is formed in parallel by many LED lamp strings or branch road (common 2～10 a string).
Background technology
The LED luminous element that is used for area illumination is made up of tens LEDs at least, is made up of hundreds of thousands of LEDs at most.Usually, be connected into a lighting sub loop, each lighting sub loop formation array structure that is connected in parallel by 2～10 LED.For LED array for illumination, basic requirement is that brightness is even, stable, and for this reason, the LED electric current of every lighting sub loop need keep constant current and controlled.Prior art generally adopts the method control LED electric current of whole voltage stabilizing, but because lighting sub loop is too many, the dispersiveness of each paths of LEDs parameter, electric current is also inequality under same voltage; Simultaneously, because variations in temperature is bigger to the current affects of LED, under the voltage stabilizing condition, the LED electric current also can change, if postcritical can cause the LED luminous efficiency to descend, reduces useful life.For fear of the problems referred to above, the LED rated current of general design is significantly smaller than the optimal luminescent electric current, causes the LED luminous efficiency not high like this, under the same illumination, has to increase LED quantity, causes cost up.
Publication number is that the Chinese patent application of CN 1469694A discloses a kind of " control circuit of at least one LED bar ", comprise first control circuit, second control circuit, first control circuit is used to control the switch of at least one LED bar, make the electric current that flows through in this LED bar reach adjustable mean value, second control circuit is used for providing supply power voltage according to the current peak that flows through at least one LED bar at least one LED bar.This kind control circuit adopts duty ratio (PWM) control LED electric current, circuit complexity not only, and cost is higher, and has impulse disturbances.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, a kind of constant current and adjusting control circuit of novel LED array for illumination are provided, this kind control circuit can not only be realized constant current control and light modulation to each lighting sub loop in the LED array for illumination, when changing, voltage instability, temperature change and LED parameter all can keep the LED current stabilization, and circuit structure is simple, and cost is low.
LED array for illumination of the present invention is formed in parallel by two lighting sub loops at least, and each bar lighting sub loop is formed by two light-emitting diode series connection at least.
The constant current of LED array for illumination of the present invention and adjusting control circuit comprise power circuit, control voltage generation circuit and constant-current dimming circuit array; The constant-current dimming circuit array contains and the identical control branch road of lighting sub loop quantity in the LED array for illumination, each bar control branch road is in series by triode Q and current feedback resistance R, transistor collector in each bar control branch road is connected with the negative electrode of last light-emitting diode in the corresponding lighting sub loop of LED array for illumination respectively, transistor base in each bar control branch road connects together, as the control point of LED array for illumination; The positive output end of power circuit is connected with control voltage generation circuit, LED array for illumination respectively, for described each circuit provides working direct current; The output of respectively controlling branch road in the constant-current dimming circuit array all is connected to power circuit ground; The output of control voltage generation circuit is connected with the control input end of constant-current dimming circuit array, for the constant-current dimming circuit array provides stable control voltage.
For example, form LED array for illumination by m * n LED, wherein: LED11, LED12 ..., LED1n is concatenated into article one lighting sub loop, LED21, LED22 ..., LED2n is concatenated into the second lighting sub loop,, LEDm1, LEDm2 ..., LEDmn is concatenated into m bar lighting sub loop; Each bar lighting sub loop is connected in parallel.Accordingly, the constant-current dimming circuit array contains m bar control branch road.First LED in each bar lighting sub loop (LED11, LED21 ..., LEDm1) anode connect the power circuit positive pole, last LED (LED1n, LED2n ..., LEDmn) negative electrode connect transistor collector in the control corresponding branch road, the emitter of triode Q in each bar control branch road connects a pin of current feedback resistance R, another pin of current feedback resistance R connects power circuit ground, transistor base in each bar control branch road connects together, as the control point of LED array for illumination.
Triode Q1 in each bar control branch road of described constant-current dimming circuit array selects the NPN triode for use.Because the NPN triode has following feature under magnifying state, its emitter voltage Ue follows its base voltage Ub (being the control point voltage to earth), and:
Ue＝I×R
I＝Ue/R＝(Ub-0.7)/R
In the following formula, I: LED electric current in the lighting sub loop, Ue: the emitter voltage of the triode Q in the control branch road, Ub: the base voltage of the triode Q in the control branch road, R: the current feedback resistance in the control branch road.
As can be seen from the above equation, the LED electric current I only by the resistance decision of transistor base voltage U b in the control corresponding branch road and current feedback resistance R, has nothing to do with other parameter in each bar lighting sub loop.
Because the transistor base in each bar control branch road connects together, so the transistor base voltage in each bar control branch road is identical, if make the resistance of the current feedback resistance R in each bar control branch road identical, can make in each bar lighting sub loop the LED electric current I identical.If change transistor base voltage U b (voltage to earth at control point), the LED electric current I also changes thereupon in each bar lighting sub loop.Therefore, control circuit of the present invention can conveniently be realized the constant current and the brightness adjustment control of LED array for illumination, and the influence that not changed by LED parameter and external environment.
The constant current of LED array for illumination of the present invention and adjusting control circuit be manually light modulation both, remote-controlled again light modulation.
The present invention has following beneficial effect:
1, the branch road of respectively controlling in the constant-current dimming circuit array is in series by triode and current feedback resistance, and circuit structure is very simple.
2, in each bar lighting sub loop, the LED electric current I is only determined by the resistance of transistor base voltage U b in the control corresponding branch road and current feedback resistance R, irrelevant with other parameter, therefore the constant current and the brightness adjustment control of LED array for illumination can be conveniently realized, when voltage instability, temperature change and LED parameter change, all the LED current stabilization can be kept.
What 3, adopt is the analog regulation mode, does not have impulse disturbances.
4, since each control branch road only forms by triode and current feedback resistance, thereby with low cost, by present market price calculating, only be about 2% of the LED array for illumination cost controlled.
Description of drawings
Fig. 1 is the constant current of light emitting diode matrix of the present invention and the structured flowchart of adjusting control circuit;
Fig. 2 is the constant current of light emitting diode matrix of the present invention and a kind of electrical schematic diagram of adjusting control circuit;
Fig. 3 is the constant current of light emitting diode matrix of the present invention and another electrical schematic diagram of adjusting control circuit.
Among the figure, 1-power circuit, 2-control voltage generation circuit, 3-constant-current dimming circuit array, 4-LED array for illumination.
Embodiment
In the present embodiment, LED array for illumination 4 is formed in parallel by 30 lighting sub loops, and each bar lighting sub loop is in series by 10 white light LEDs, 3 volts of the conducting voltage of LED, 20 milliamperes of recommended currents.
The constant current of above-mentioned LED array for illumination and adjusting control circuit comprise power circuit 1, control voltage generation circuit 2 and constant-current dimming circuit array 3 as shown in Figure 2.Constant-current dimming circuit array 3 contains 30 control branch roads, and each bar control branch road is in series by the current feedback resistance R of NPN triode Q (selecting 8050 for use) and resistance 20 Europe (1% precision).Control voltage generation circuit 2 comprises the voltage stabilizing circuit of being made up of current-limiting resistance Rz and voltage-stabiliser tube Dz (5 volts voltage-stabiliser tubes), the potentiometer Dw in parallel with voltage-stabiliser tube Dz, the emitter follower circuit of being made up of NPN triode Q1 (selecting 8050 for use) and resistance R 1, R2.Power circuit 1 is in series by transformer, bridge rectifier, inductance L and capacitor C, transformer is transformed into 30 volts of AC value with 220 volts of AC value, and bridge rectifier, inductance L (150mH), capacitor C (1000uF) are filtered into 30 volts of AC rectification approximate 32 volts not direct current of voltage regulation.The connected mode of power circuit 1, control voltage generation circuit 2, constant-current dimming circuit array 3, LED array for illumination 4 is as follows:
The anode of first LED in each bar lighting sub loop of LED array for illumination 4 connects the positive pole of power circuit 1, and the negative electrode of last LED connects the triode Q collector electrode in the control corresponding branch road; Triode Q emitter in each bar control branch road of constant-current dimming circuit array 3 connects a pin of current feedback resistance R, and another pin of current feedback resistance R connects power circuit ground; Triode Q base stage in each bar control branch road connects together, as the control point of LED array for illumination 4; The base stage of triode Q1 in the control voltage generation circuit 2 is connected with the centre cap of potentiometer Dw, and the emitter of triode Q1 is connected with the control voltage input point of constant-current dimming circuit array 3.Potentiometer Dw is to voltage dividing potential drop and output control voltage, change the centre tapped position of potentiometer Dw, can change the control voltage of constant-current dimming circuit array 3, thereby change the base voltage Ub of the triode Q in each bar control branch road, realize constant current and brightness adjustment control LED in the LED array for illumination 4.
Embodiment 2
In the present embodiment, the structure of LED array for illumination 4 is identical with embodiment 1 with the quantity of white light LEDs.The constant current of LED array for illumination and adjusting control circuit comprise power circuit 1, control voltage generation circuit 2 and constant-current dimming circuit array 3 as shown in Figure 2.The structure of power circuit 1, constant-current dimming circuit array 3 is identical with embodiment 1 with electrical quantity.Difference from Example 1 is the structure of control voltage generation circuit 2.
Control voltage generation circuit 2 in the present embodiment comprises the voltage stabilizing circuit of being made up of current-limiting resistance Rz and voltage-stabiliser tube Dz, electronic potentiometer EP, receiver of remote-control sytem RM, remote control transmitter, the emitter follower circuit of being made up of triode Q1 and resistance R 1, R2; The input Y of electronic potentiometer EP and VCC pin connect voltage-stabiliser tube Dz negative electrode, and its GND pin and output V connect voltage-stabiliser tube Dz anode, and its centre cap W connects triode Q1 base stage; Two outputs of receiver of remote-control sytem RM connect INC pin and the DEC pin of electronic potentiometer EP respectively; Remote control transmitter is the individual devices by people's control, is used for sending to receiver of remote-control sytem the signal of the control voltage that changes constant-current dimming circuit array 3.Receiver of remote-control sytem receives the remote control transmitter signal, to the INC of electronic potentiometer EP pin output pulse, the centre cap W output voltage of electronic potentiometer EP increases, LED array for illumination 4 electric currents increase, and brightness increases, otherwise, to the DEC of electronic potentiometer EP pin output pulse, the centre cap W output voltage of electronic potentiometer EP reduces, and LED array for illumination 4 electric currents reduce, and brightness reduces.
Claims (6)
1. the constant current of a LED array for illumination and adjusting control circuit, described LED array for illumination (4) is formed in parallel by two lighting sub loops at least, each bar lighting sub loop is formed by two light-emitting diode series connection at least, it is characterized in that comprising power circuit (1), control voltage generation circuit (2) and constant-current dimming circuit array (3);
Constant-current dimming circuit array (3) contain with LED array for illumination (4) in the identical control branch road of lighting sub loop quantity, each bar control branch road is in series by triode Q and current feedback resistance R, transistor collector in each bar control branch road is connected with the negative electrode of last light-emitting diode in the corresponding lighting sub loop of LED array for illumination (4) respectively, transistor base in each bar control branch road connects together, as the control point of LED array for illumination (4);
The positive output end of power circuit (1) is connected with control voltage generation circuit (2), LED array for illumination (4) respectively, for described each circuit provides working direct current; The output of respectively controlling branch road in the constant-current dimming circuit array (3) all is connected to power circuit ground;
The output of control voltage generation circuit (2) is connected with the control input end of constant-current dimming circuit array (3), for the constant-current dimming circuit array provides stable control voltage.
2. the constant current of LED array for illumination according to claim 1 and adjusting control circuit, it is characterized in that controlling voltage generation circuit (2) and comprise the voltage stabilizing circuit of forming by current-limiting resistance Rz and voltage-stabiliser tube Dz, the potentiometer Dw in parallel with voltage-stabiliser tube Dz, the emitter follower circuit of forming by triode Q1 and resistance R 1, R2;
The base stage of triode Q1 is connected with the centre cap of potentiometer Dw, the emitter of triode Q1 and constant-current dimming circuit array (3) the control input end be connected.
3. the constant current of LED array for illumination according to claim 1 and adjusting control circuit, it is characterized in that controlling voltage generation circuit (2) and comprise the voltage stabilizing circuit of forming by current-limiting resistance Rz and voltage-stabiliser tube Dz, electronic potentiometer EP, receiver of remote-control sytem RM, remote control transmitter, the emitter follower circuit of forming by triode Q1 and resistance R 1, R2;
The input Y of electronic potentiometer EP and VCC pin connect voltage-stabiliser tube Dz negative electrode, and its GND pin and output V connect voltage-stabiliser tube Dz anode, and its centre cap W connects triode Q1 base stage;
Two outputs of receiver of remote-control sytem RM connect INC pin and the DEC pin of electronic potentiometer EP respectively, and remote control transmitter is the individual devices by people's control, are used for sending to receiver of remote-control sytem the signal of the control voltage that changes constant-current dimming circuit array (3).
4. according to the constant current and the adjusting control circuit of claim 1 or 2 or 3 described LED array for illumination, it is characterized in that the triode Q in each bar control branch road of constant-current dimming circuit array (3) is the NPN triode.
5. according to the constant current and the adjusting control circuit of claim 1 or 2 or 3 described LED array for illumination, it is characterized in that power circuit (1) is in series by transformer, bridge rectifier, inductance L and capacitor C.
6. the constant current of LED array for illumination according to claim 4 and adjusting control circuit is characterized in that power circuit (1) is in series by transformer, bridge rectifier, inductance L and capacitor C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710049362XA CN101106852B (en) | 2007-06-25 | 2007-06-25 | Current constant and light adjusting control circuit for luminescent LED array |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710049362XA CN101106852B (en) | 2007-06-25 | 2007-06-25 | Current constant and light adjusting control circuit for luminescent LED array |
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| Publication Number | Publication Date |
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| CN101106852A CN101106852A (en) | 2008-01-16 |
| CN101106852B true CN101106852B (en) | 2010-12-08 |
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| CN200710049362XA Expired - Fee Related CN101106852B (en) | 2007-06-25 | 2007-06-25 | Current constant and light adjusting control circuit for luminescent LED array |
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| CN103096590B (en) * | 2013-01-07 | 2015-01-28 | 浙江工业大学 | High voltage light-emitting diode (LED) lamp bead driving power supply controlled by sectional type sinusoidal current |
| FR3005788B1 (en) * | 2013-05-14 | 2016-10-21 | Commissariat Energie Atomique | OPTOELECTRONIC DEVICE AND METHOD FOR MANUFACTURING THE SAME |
| CN103826370B (en) * | 2014-03-06 | 2017-01-18 | 南京矽力杰半导体技术有限公司 | Current forming method and current source circuit |
| CN104902644A (en) * | 2015-06-09 | 2015-09-09 | 廖婕 | Transformer-free-structure-based LED light modulation drive circuit |
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| CN108235502A (en) * | 2017-01-19 | 2018-06-29 | 肖志军 | The constant current driving method and circuit of LED light light modulation |
| CN107071986B (en) * | 2017-05-31 | 2019-02-01 | 惠州市西顿工业发展有限公司 | A kind of light adjusting circuit of LED lamp |
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| CN108848591A (en) * | 2018-04-24 | 2018-11-20 | 林泽泓 | Automatically keep the constant lighting lamp device of illuminance |
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| CN1469694A (en) * | 2002-06-10 | 2004-01-21 | ���ר����������˾ | Control circuit with at least one LED bar |
| CN2746481Y (en) * | 2004-09-15 | 2005-12-14 | 青春茂 | Luminous lamp string for full-colour advertisement and word plate lighting |
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|---|---|---|---|---|
| CN1469694A (en) * | 2002-06-10 | 2004-01-21 | ���ר����������˾ | Control circuit with at least one LED bar |
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| CN101106852A (en) | 2008-01-16 |
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