CN103796382A - Drive power circuit capable of being adapted to different numbers of series connection LEDs - Google Patents
Drive power circuit capable of being adapted to different numbers of series connection LEDs Download PDFInfo
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- CN103796382A CN103796382A CN201410018695.6A CN201410018695A CN103796382A CN 103796382 A CN103796382 A CN 103796382A CN 201410018695 A CN201410018695 A CN 201410018695A CN 103796382 A CN103796382 A CN 103796382A
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Abstract
The invention relates to a drive power circuit capable of being adapted to different numbers of series connection LEDs. The drive power circuit capable of being adapted to different numbers of series connection LEDs is characterized in that a rectifying circuit, a voltage source, a current source and a flexible control circuit are at least included, alternating currents of 220v are rectified by the rectifying circuit, then pulsating direct currents of 310v are output, the cycle of the pulsating direct currents is 100HZ, pulsating direct current signals of 100HZ are divided into two ways, one way of the pulsating direct current signals are output to the input end of the flexible control circuit, and the other way of the pulsating direct current signals are input to the input end of the voltage source. After the signals are output to the input end of the flexible control circuit, the flexible control circuit generates control signals with unequal duty ratios to control the voltage source, and the voltage source generates multiple ways of output according to the control signals with the unequal duty ratios. The multiple ways of output are electrically connected with the positive electrode input ends of different numbers of LED lamps which are in series connection, the negative ends of the series connection LED lamps are electrically connected with the input end of the current source, the negative end of the current source is connected to the ground, voltage sampling is conducted through a sampling resistor R0 of the current source, and the sampling voltage of the R0 is input to the input end of the flexible control circuit. The drive power circuit capable of being adapted to different numbers of series connection LEDs has the advantages of being high in reliability, long in service life, high in controllability, high in cost performance and the like.
Description
Technical field
The present invention relates to a kind of LED driving power circuit, particularly a kind of driving power circuit that adapts to different series LED numbers.
Background technology
The at present conventional illuminating lamp pearl of LED, current-voltage characteristic all designs under the state of the little electric current of low-voltage and works, and needs many lamp pearl series, parallel or serial/parallel being combined with during for lighting.Although adopt the required voltage of many LED of drives in parallel lower, due to the forward voltage drop difference of every LED, make the brightness difference of every LED, unless adopted every LED to regulate separately, implement more complicated so parallel way will reach brightness uniformity; But it is identical to adopt series system can guarantee to flow through the electric current of every LED, reaches brightness uniformity; So adopt LED lamp pearl cascaded structure, high drive will become following LED light fixture market, the main flow of LED lamp pearl structural design.
Under same power output, the required drive current of high drive LED is significantly less than the electric current of low-voltage driving LED, the LED of the 1W power take common forward voltage drop as 3V is example, drive 1W power LED to need the drive current of 350ma, but adopt series design, 50V driving voltage, the drive current that only needs 20ma is exportable 1W power, reduce like this circuit and lead-in wire loss, this means and can greatly reduce LED light fixture heat radiation cost, reduced overall light fixture temperature rise.
In series design, how to reach the output voltage needing, or the number of loading series LED is the thought that the present invention designs.
Summary of the invention
The object of this invention is to provide one have highly reliable, the long-life, high controlled, the driving power circuit of different series LED numbers that what cost performance was high adapt to.
The object of the present invention is achieved like this, and a kind of driving power circuit that adapts to different series LED numbers, is characterized in that: at least comprise: rectification circuit, voltage source, current source, Flexible Control circuit; Exchange the pulsating direct current that 220v exports 310v after rectification circuit rectification, the pulsating direct current cycle is 100H
z, 100H
zpulsating direct current signal divide two-way, one tunnel outputs to Flexible Control circuit input end, another road is input to voltage source input, after outputing to Flexible Control circuit input end, produce by Flexible Control circuit the control signal control voltage source that duty ratio does not wait, the control signal that voltage source is not waited by duty ratio produces multichannel output; Multichannel output is electrically connected from the different number positive electrode of the LED lamp input being connected in series respectively, the LED lamp negative terminal being connected in series is electrically connected with current source input, current source negativing ending grounding, by current source sample resistance, R0 carries out voltage sampling, and the sampling voltage of R0 is input to Flexible Control circuit input end.
Described voltage source is made up of three switch transistor T 1, T2, T3, the control end of three switch transistor T 1, T2, T3 is electrically connected with Flexible Control circuit, the input of three switch transistor T 1, T2, T3 is electrically connected with rectification circuit output end, the output of three switch transistor T 1, T2, T3 respectively from the different number positive electrode of the LED lamp input electrical connection being connected in series.
Described voltage source is made up of two switch transistor T 1, T2, T3, the control end of two switch transistor T 1, T2 is electrically connected with Flexible Control circuit, the input of two switch transistor T 1, T2 is electrically connected with rectification circuit output end, the output of two switch transistor T 1, T2 respectively from the different number positive electrode of the LED lamp input electrical connection being connected in series.
The different numbers of the described LED lamp being connected in series are by the operating voltage stepping of LED.
Advantage of the present invention is:
Pulse width control technology is used in drive circuit by Flexible Control circuit, and whole circuit has simple in structure, and efficiency is high, the distinguishing feature that volume is little.
LED is in discontinuous operation state, so the temperature rise of LED light fixture is little.
This driving power is operated in and exchanges 100HZ, and LED is operated in flexible state, has fully applied the afterglow effect of fluorescent material in LED, has overcome stroboscopic.
By detecting, input voltage drive current variations in 220 ~ 240V excursion is less than 2ma, and LED junction temperature is lower than 40 ℃, and power supply conversion efficiency in normal power supply 220V situation, leads Yin Shuo≤0.9 up to 98%, Gong.
Accompanying drawing explanation
Below in conjunction with embodiment accompanying drawing, the invention will be further described:
Fig. 1 is principle of the invention figure;
Fig. 2 embodiment of the present invention 1 circuit theory diagrams;
Fig. 3 embodiment of the present invention 2 road schematic diagrams;
Fig. 4 forms by CD40106 the output waveform that Flexible Control circuit produces.
In figure, 1, rectification circuit; 2, voltage source; 3, current source; 4, the LED lamp being connected in series; 5, Flexible Control circuit; 6, the first switching tube; 7, second switch pipe; 8, the 3rd switching tube.
Embodiment
As shown in Figure 1, a kind of driving power circuit that adapts to different series LED numbers, at least comprises: rectification circuit 1, voltage source 2, current source 3, Flexible Control circuit 5; Exchange the pulsating direct current that 220v exports 310v after rectification circuit 1 rectification, the pulsating direct current cycle is 100H
z, 100H
zpulsating direct current signal divide two-way, one tunnel outputs to Flexible Control circuit 5 inputs, another road is input to voltage source 2 inputs, voltage source 2 has multichannel output to input node with the LED lamp 4 being connected in series to be respectively electrically connected, LED lamp 4 negative terminals that are connected in series are electrically connected with current source 3 inputs, current source 3 negativing ending groundings, produce by Flexible Control circuit 5 the control signal control voltage source 2 that duty ratio does not wait, and the control signal that voltage source 2 is not waited by duty ratio produces multichannel output; Multichannel output is electrically connected from different connected node positive electrode inputs in the LED lamp 4 being connected in series respectively, LED lamp 4 negative terminals that are connected in series are electrically connected with current source 3 inputs, by current source 3 sample resistance R0 voltage samplings, the sampling voltage of R0 is input to Flexible Control circuit 5 inputs, Flexible Control circuit 5 is according to the sampling voltage of R0, adjust voltage source 2 and export, make to be operated in the electric current constant current work of the LED lamp 4 being connected in series.
As shown in Figure 2, can provide an embodiment of Fig. 2 according to the thinking of Fig. 1, comprise: rectification circuit 1, voltage source 2, current source 3, Flexible Control circuit 5; Wherein, described voltage source 2 is made up of three switch transistor T 1, T2, T3, the control end of three switch transistor T 1, T2, T3 is electrically connected with Flexible Control circuit 5, the input of three switch transistor T 1, T2, T3 is electrically connected with rectification circuit 1 output, the output of three switch transistor T 1, T2, T3 respectively from the different number positive electrode of the LED lamp 4 input electrical connection being connected in series.Exchange the pulsating direct current that 220v exports 310v after rectification circuit 1 rectification, the pulsating direct current cycle is 100H
z, 100H
zpulsating direct current signal output to Flexible Control circuit 5 inputs, produce not three switch transistor T 1 of Deng tri-tunnel control signal controls, T2, T3 of duty ratio by Flexible Control circuit 5, make three switch transistor T 1, T2, T3 produce three tunnels outputs by duty ratio control signal not etc.; Switch transistor T 1 is electrically connected with the top of the LED lamp 4 being connected in series; Switch transistor T 2 is electrically connected from the 3rd positive terminal of upper beginning with the LED lamp 4 being connected in series; Switch transistor T 3 is electrically connected from the 6th positive terminal of upper beginning with the LED lamp 4 being connected in series, LED lamp 4 negative terminals that are connected in series are electrically connected with current source 3 inputs, by current source 3 sample resistance R0 voltage samplings, the sampling voltage of R0 is input to Flexible Control circuit 5 inputs, Flexible Control circuit 5 is according to the sampling voltage of R0, adjust three switch transistor T 1, T2, T3 pulsewidth width, the electric current that makes to be operated in the LED lamp 4 being connected in series reaches best.The described different numbers of LED lamp 4 that are connected in series are by the operating voltage stepping of LED, and a LED is 3 volts, and 3 is 9.
As shown in Figure 3, can provide an embodiment of Fig. 3 according to the thinking of Fig. 1, comprise: rectification circuit 1, voltage source 2, current source 3, Flexible Control circuit 5; Wherein, described voltage source 2 is made up of two switch transistor T 1, T2, the control end of two switch transistor T 1, T2 is electrically connected with Flexible Control circuit 5, the input of two switch transistor T 1, T2 is electrically connected with rectification circuit 1 output, the output of two switch transistor T 1, T2 respectively from the different number positive electrode of the LED lamp 4 input electrical connection being connected in series.Exchange the pulsating direct current that 220v exports 310v after rectification circuit 1 rectification, the pulsating direct current cycle is 100H
z, 100H
zpulsating direct current signal output to Flexible Control circuit 5 inputs, produce not two switch transistor T 1 of Deng bis-tunnel control signal controls, T2 of duty ratio by Flexible Control circuit 5, make two switch transistor T 1, T2 produce two tunnels outputs by duty ratio control signal not etc.; Switch transistor T 1 is electrically connected with the top of the LED lamp 4 being connected in series; Switch transistor T 2 is electrically connected from the 3rd positive terminal of upper beginning with the LED lamp 4 being connected in series; LED lamp 4 negative terminals that are connected in series are electrically connected with current source 3 inputs, by current source 3 sample resistance R0 voltage samplings, the sampling voltage of R0 is input to Flexible Control circuit 5 inputs, Flexible Control circuit 5 is according to the sampling voltage of R0, adjust two switch transistor T 1, T2 pulsewidth width, the electric current that makes to be operated in the LED lamp 4 being connected in series reaches best.
In fact, voltage source 2 also can be made up of 4 or 5 switching tubes, and its course of work is identical with embodiment 2 with embodiment 1.
Operation principle of the present invention is: Flexible Control circuit is according to the voltage status of rectification circuit output, the output in automatic regulating voltage source realizes the diversity of output waveform, complete flexible output, reach the stack of the many level of output, coupling LED load, make LED be operated in optimum state, make on the other hand circuit there is stronger remoldability and applicability widely, reduce circuit power consumption, volume and raising reliability.Meanwhile, detect the size of current source, the voltage and current of control and protection LED, makes LED be operated in the safety operation area of design, and its key technology is pulse width control and many level superimposing technique.This Flexibility Control Technique, circuit structure is simple, and take semiconductor device as main, resistance is auxiliary, without perception and electrochemical capacitor device, integrated circuit working temperature strong adaptability, good stability, easy to adjust.
As shown in Figure 4, Flexible Control circuit can be that processor or logical circuit form, and the Schmidt trigger that logical circuit adopts CD40106 to form, is changed by triggering and the width of CD40106 settling signal, form the pulse duty cycle needing, adjust three switch transistor T 1, T2, T3 pulsewidth width.
The parts that the present embodiment does not describe in detail and structure belong to well-known components and common structure or the conventional means of the industry, here not narration one by one.
Claims (4)
1. the driving power circuit that can adapt to different series LED numbers, is characterized in that: at least comprise: rectification circuit (1), voltage source (2), current source (3), Flexible Control circuit (5); Exchange the pulsating direct current that 220v exports 310v after rectification circuit (1) rectification, the pulsating direct current cycle is 100H
z, 100H
zpulsating direct current signal divide two-way, one tunnel outputs to Flexible Control circuit (5) input, another road is input to voltage source (2) input, after outputing to Flexible Control circuit (5) input, produce by Flexible Control circuit (5) the control signal control voltage source (2) that duty ratio does not wait, the control signal that voltage source (2) is not waited by duty ratio produces multichannel output; Multichannel output is electrically connected from the different number positive electrode of LED lamp (4) input being connected in series respectively, LED lamp (4) negative terminal being connected in series is electrically connected with current source (3) input, current source (3) negativing ending grounding, by current source (3), sample resistance R0 carries out voltage sampling, and the sampling voltage of R0 is input to Flexible Control circuit (5) input.
2. a kind of driving power circuit that adapts to different series LED numbers according to claim 1, it is characterized in that: described voltage source (2) is made up of three switch transistor T 1, T2, T3, the control end of three switch transistor T 1, T2, T3 is electrically connected with Flexible Control circuit (5), the input of three switch transistor T 1, T2, T3 is electrically connected with rectification circuit (1) output, the output of three switch transistor T 1, T2, T3 respectively from the different number positive electrode of LED lamp (4) the input electrical connection being connected in series.
3. a kind of driving power circuit that adapts to different series LED numbers according to claim 1, it is characterized in that: described voltage source (2) is made up of two switch transistor T 1, T2, T3, the control end of two switch transistor T 1, T2 is electrically connected with Flexible Control circuit (5), the input of two switch transistor T 1, T2 is electrically connected with rectification circuit (1) output, the output of two switch transistor T 1, T2 respectively from the different number positive electrode of LED lamp (4) the input electrical connection being connected in series.
4. a kind of driving power circuit that adapts to different series LED numbers according to claim 1, is characterized in that: the described different numbers of LED lamp (4) that are connected in series are by the operating voltage stepping of LED.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410018695.6A CN103796382A (en) | 2014-01-16 | 2014-01-16 | Drive power circuit capable of being adapted to different numbers of series connection LEDs |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410018695.6A CN103796382A (en) | 2014-01-16 | 2014-01-16 | Drive power circuit capable of being adapted to different numbers of series connection LEDs |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102461332A (en) * | 2009-05-04 | 2012-05-16 | 艾杜雷控股有限公司 | Control unit for a led assembly and lighting system |
| US20120146523A1 (en) * | 2010-12-11 | 2012-06-14 | Jae Hong Jeong | Light emitting diode driver |
| CN102711319A (en) * | 2012-05-03 | 2012-10-03 | 李云霄 | LED (light emitting diode) light source subregion subsection transformation input driving control method and control circuit thereof |
| CN103068113A (en) * | 2012-12-21 | 2013-04-24 | 上海欣丰电子有限公司 | Light emitting diode (LED) linear sectional type power supply |
| CN203225926U (en) * | 2013-04-12 | 2013-10-02 | 广州怡泰照明电子科技有限公司 | LED lamp having self-adaptive drive circuit and self-adaptive drive circuit |
-
2014
- 2014-01-16 CN CN201410018695.6A patent/CN103796382A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102461332A (en) * | 2009-05-04 | 2012-05-16 | 艾杜雷控股有限公司 | Control unit for a led assembly and lighting system |
| US20120146523A1 (en) * | 2010-12-11 | 2012-06-14 | Jae Hong Jeong | Light emitting diode driver |
| CN102711319A (en) * | 2012-05-03 | 2012-10-03 | 李云霄 | LED (light emitting diode) light source subregion subsection transformation input driving control method and control circuit thereof |
| CN103068113A (en) * | 2012-12-21 | 2013-04-24 | 上海欣丰电子有限公司 | Light emitting diode (LED) linear sectional type power supply |
| CN203225926U (en) * | 2013-04-12 | 2013-10-02 | 广州怡泰照明电子科技有限公司 | LED lamp having self-adaptive drive circuit and self-adaptive drive circuit |
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Application publication date: 20140514 |