CN103152932A - LED (Light Emitting Diode) drive circuit capable of adjusting light and color temperature - Google Patents
LED (Light Emitting Diode) drive circuit capable of adjusting light and color temperature Download PDFInfo
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- CN103152932A CN103152932A CN2013100574016A CN201310057401A CN103152932A CN 103152932 A CN103152932 A CN 103152932A CN 2013100574016 A CN2013100574016 A CN 2013100574016A CN 201310057401 A CN201310057401 A CN 201310057401A CN 103152932 A CN103152932 A CN 103152932A
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Abstract
The invention relates to an LED (Light Emitting Diode) drive circuit capable of adjusting light and color temperature. The LED drive circuit is adopted for driving an LED lighting device which consists of N paths of LED string lights, wherein N is more than or equal to 2. The LED drive circuit comprises a constant current generating circuit, a buffer circuit, a selection circuit and a control circuit. According to the light adjusting and color temperature adjusting demand of the LED lighting device, a corresponding control signal is generated by the control circuit to control the states of the constant current generating circuit and the selection circuit. A direct current input voltage and the control signal are received by the constant current generating circuit, so that a constant output current is generated to drive the LED lighting device. The buffer circuit is connected to the output end of the constant current generating circuit, so that the output voltage which is output by the constant current generating circuit is limited. The selection circuit is connected with N paths of the LED string lights, so that the corresponding LED string light is selected according to the control signal and driven by the output current.
Description
Technical field
The present invention relates to lighting field, relate in particular to a kind of LED drive circuit of tunable optical adjustable color temperature.
Background technology
The LED illumination has high light efficiency as a kind of novel illuminations, and the long-life, therefore the advantages such as environmental protection also more and more are widely used in various lighting fields.The dimming mode of LED is divided into two kinds of direct current light modulation and PWM light modulations.Due to the PWM light modulation have photochromic constant, the stability advantage such as better during low-light level, and widely being adopted by those skilled in the art institute.
For some special light sources environment, not only need the brightness of LED light fixture is regulated, also need the colour temperature of LED light fixture is regulated.In prior art, usually adopt the LED lamp with different color light to be packaged in a single encapsulating structure, as a LED light fixture independently, the combination of the LED lamp by different color light obtains different colour temperatures, realizes the adjusting to LED light fixture colour temperature.
With reference to figure 1, be depicted as the theory diagram of the LED drive circuit of the tunable optical adjustable color temperature that adopts prior art.In this implementation, the LED drive circuit of tunable optical adjustable color temperature comprises electromagnetic interface filter 101, AC/DC constant voltage circuit 102, and with the LED lamp string of different color light a plurality of DC/DC constant-current circuits 103 one to one, and MCU controller 104.
With reference to figure 2, be depicted as the theory diagram of the LED drive circuit of the another kind of tunable optical adjustable color temperature that adopts prior art.In this implementation, the LED drive circuit 200 of tunable optical adjustable color temperature comprises electromagnetic interface filter 201, rectifier bridge 202, and with the LED lamp string of different color light a plurality of constant current generating circuits 203 one to one, and MCU controller 204.
After AC power AC process electromagnetic interface filter 201 and rectifier bridge 202, be converted to half-sinusoid rectification input voltage vin, provide the power supply supply with a plurality of constant current generating circuits 203 of giving rear class.
As seen, in prior art, the LED drive circuit of tunable optical adjustable color temperature is all that independently constant-current circuit drives the LED lamp string of corresponding coloured light, and the brightness of controlling LED lamp string, and the combination of the LED lamp string by this different color light realizes the adjusting to colour temperature and brightness.Such implementation, circuit structure are too complicated, and the components and parts number is too much, and system bulk is very huge.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of LED drive circuit of novel tunable optical adjustable color temperature, too complicated to solve in prior art circuit structure, the problem such as the components and parts number is too much, and utilance is not high.
LED drive circuit according to a kind of tunable optical adjustable color temperature of one embodiment of the invention, in order to drive the LED lighting device that is formed by N paths of LEDs lamp string, N 〉=2, it is characterized in that, the LED drive circuit of described tunable optical adjustable color temperature comprises a constant current generating circuit, and a buffer circuit, is selected circuit and a control circuit; Wherein,
Described control circuit produces according to light modulation and the color-temperature regulating requirement of described LED lighting device the state that corresponding control signal is controlled described constant current generating circuit and described selection circuit;
Described constant current generating circuit receives DC input voitage and described control signal, drives described LED lighting device to produce constant output current;
Described buffer circuit is connected to the output of described constant current generating circuit, to limit the output voltage of described constant current generating circuit output;
Described selection circuit and described N paths of LEDs lamp series winding connect, and to select corresponding described LED lamp string according to described control signal, make described output current drive corresponding described LED lamp string.
Further, the LED drive circuit of described tunable optical adjustable color temperature also comprises the output that is connected to described constant current generating circuit and the output capacitance between described buffer circuit, carries out filtering with the output signal to described constant current generating circuit.
According to the LED drive circuit of the tunable optical adjustable color temperature of one embodiment of the invention, wherein, buffer circuit comprises the first inductance and the first electric capacity that is connected in series.
LED drive circuit according to the tunable optical adjustable color temperature of one embodiment of the invention, wherein, select circuit to comprise N gate-controlled switch, each described gate-controlled switch and corresponding one tunnel described LED lamp string are connected in series and form a LED branch road, the described LED branch road in N road two outputs that are connected to described buffer circuit parallel with one another.
Further, described control circuit produces N+1 described control signal, to control respectively the on off state of the power switch pipe in a described N gate-controlled switch and described constant current generating circuit.
Closed described gate-controlled switch is controlled the periodic closed and shutoff of described power switch pipe, realizes the monochromatic light modulation to described LED lighting device.
Control at least two described gate-controlled switches and be alternately closed, and, the periodic closed and shutoff of described power switch pipe controlled, to realize simultaneously the brightness of described LED lighting device and the adjusting of colour temperature.
The LED drive circuit that is the tunable optical adjustable color temperature of strength according to the present invention also comprises electromagnetic interface filter and rectifier bridge, processes in order to the AC power that receives is carried out filtering and rectification, to obtain described DC input voitage.
Further, described constant current generating circuit comprises a single-stage AC/DC constant-current circuit.
Further, described constant current generating circuit comprises an AC/DC constant voltage circuit and a DC/DC constant-current circuit that is connected in series.
According to the LED drive circuit of the tunable optical adjustable color temperature of the embodiment of the present invention, all LED lamp strings share a constant current generating circuit.According to the color-temperature regulating demand of LED lighting device, select corresponding LED lamp string by a selection circuit, make the output current of constant current generating circuit drive this LED lamp string; And the size of regulating the output current of constant current generating circuit according to the light modulation demand.By above, combination with different-colour LED lamp string is realized the brightness of LED lighting device and the adjusting of colour temperature.LED drive circuit according to the tunable optical adjustable color temperature of the embodiment of the present invention, not only can well realize light modulation and the color-temperature regulating control of LED lighting device, greatly simplify circuit structure simultaneously, improve utilization ratio, provide cost savings, and the volume of LED lighting device.
Description of drawings
Figure 1 shows that the theory diagram of the LED drive circuit of a kind of tunable optical adjustable color temperature that adopts prior art;
Figure 2 shows that the theory diagram of the LED drive circuit of the another kind of tunable optical adjustable color temperature that adopts prior art;
Fig. 3 A is depicted as the theory diagram according to the LED drive circuit of the tunable optical adjustable color temperature of first embodiment of the invention;
Fig. 3 B is depicted as the working waveform figure of monotone light time of the LED drive circuit of the tunable optical adjustable color temperature shown in Fig. 3 A;
Working waveform figure when Fig. 3 C is depicted as the light modulation of LED drive circuit of the tunable optical adjustable color temperature shown in Fig. 3 A and color-temperature regulating.
Embodiment
Below in conjunction with accompanying drawing, several preferred embodiments of the present invention are described in detail, but the present invention is not restricted to these embodiment.The present invention contain any make on marrow of the present invention and scope substitute, modification, equivalent method and scheme.Understand for the public is had thoroughly the present invention, describe concrete details in detail in the following preferred embodiment of the present invention, and do not have for a person skilled in the art the description of these details also can understand the present invention fully.
With reference to figure 3A, be depicted as the theory diagram according to the LED drive circuit of the tunable optical adjustable color temperature of first embodiment of the invention.
In this embodiment, the LED drive circuit 300 of tunable optical adjustable color temperature is in order to drive the LED lighting device 301 that is comprised of 3 paths of LEDs lamp strings with different color.The LED drive circuit 300 of tunable optical adjustable color temperature comprises constant current generating circuit 305, and buffer circuit 304 is selected circuit 304 and control circuit 303.
Wherein, control circuit 303 produces corresponding control signal PWMQ according to light modulation and the color-temperature regulating requirement of LED lighting device 301, and PWM1, PWM2 and PWM3 control constant current generating circuit 305 and select the state of circuit 302.
Constant current generating circuit 305 receives DC input voitage V
DCWith control signal PWMQ, to produce constant output current i
outDrive described LED lighting device, and output voltage V
outHere, DC input voitage V
DCCan carry out for the AC power AC by electromagnetic interface filter and rectifier bridge 306 pairs of outsides obtaining after filtering and rectification are processed.
Buffer circuit 304 is connected between two outputs of constant current generating circuit 305, with the output voltage V of restriction constant current generating circuit output
out, prevent output voltage V
outOvershoot, and the lamp pearl of damage LED lighting device 301.
Select between circuit 302 and LED lighting device 301, with according to control signal PWM1, PWM2 and PWM3 select corresponding LED lamp string, make described this corresponding LED lamp string of output current driving.
Further, the LED drive circuit 300 of tunable optical adjustable color temperature can also comprise the output that is connected to constant current generating circuit 305 and the output capacitance C between buffer circuit 304
out, with the output voltage V to constant current generating circuit 305
outCarry out filtering.
In addition, in this embodiment, the LED drive circuit 300 of tunable optical adjustable color temperature describes a kind of specific implementation of selecting circuit 302 and buffer circuit 304 in detail.
Concrete, buffer circuit 304 comprises the first inductance L 1 and the first capacitor C 1 between two outputs that are connected in series in constant current generating circuit 305.
Select circuit 302 to comprise 3 controllable switch S 1, S2 and S3, each gate-controlled switch and corresponding one tunnel described LED lamp string are connected in series composition one LED branch road, and 3 paths of LEDs branch roads are parallel with one another to be connected between two outputs of buffer circuit 304.According to control signal PWM1, the state of PWM2 and PWM3, controllable switch S 1, S2 and S3 carry out corresponding closure or opening operation.According to the number of the LED branch road of gate-controlled switch closure, output current i
outFlow through in whole or in part corresponding LED lamp string, thereby driving LED lamp string has corresponding brightness.And the combination each other of the LED lamp string by having different color makes LED lighting device 301 have different colour temperatures.
For example, closed controllable switch S 1, the size of the output current by regulating constant current generating circuit 305 realizes the monochromatic light modulation to the 301LED lighting device.Control controllable switch S 1 and S2 and be alternately closed, and regulate simultaneously the size of the output current of constant current generating circuit 305, realized the brightness of LED lighting device 301 and the adjusting of colour temperature.
Here, constant current generating circuit can be realized by different implementations.For example, constant current generating circuit can comprise a single-stage AC/DC constant-current circuit, perhaps comprises the AC/DC constant voltage circuit and the DC/DC constant-current circuit that are connected in series.Control signal PWMQ realizes the adjusting to output current by controlling the periodic closed and shutoff of power switch pipe in constant current generating circuit.
It is elaborated to the concrete control operation of control circuit 302 below with reference to working waveform figure.
With reference to figure 3B, be depicted as the working waveform figure of monotone light time of the LED drive circuit of the tunable optical adjustable color temperature shown in Fig. 3 A.With LED lamp string 301-1, and the control sequential of control signal is high level 1 for effectively, and low level 0 be the invalid example that is, LED lighting device 301 is being carried out the monotone light time, the controllable switch S 1 that driving circuits 302 is controlled and LED lamp string 301-1 is in series.
With reference to figure 3C, the working waveform figure when being depicted as the light modulation of LED drive circuit of the tunable optical adjustable color temperature shown in Fig. 3 A and color-temperature regulating.
When LED lighting device 301 was carried out light modulation and color-temperature regulating simultaneously, control circuit 302 was controlled the brightness with corresponding LED lamp string.Take LED lamp string 301-1 and 301-2 as example, control signal PWMQ is a square-wave signal, and respective change is carried out in the brightness as required of its duty ratio.Simultaneously, by control signal PWM1, PWM2 and PWM3 select corresponding LED lamp string.For example, from moment t0 to moment t1, control signal PWM1 is high level 1, and control signal PWM2 and control signal PWM3 are low level 0, and controllable switch S 1 is in closure state, and controllable switch S 2 and S3 are in off state; And from moment t1 to moment t2, control signal PWM2 is high level 1, and control signal PWM1 and control signal PWM3 are low level 0, and controllable switch S 2 is in closure state, and controllable switch S 1 and S3 are in off state; By the selection to LED lamp string, realized the adjusting to LED lighting device colour temperature.
LED drive circuit according to the tunable optical adjustable color temperature of the embodiment of the present invention goes for different input powers, for example direct voltage source DC or alternating-current voltage source AC.The position relationship of LED lamp string and gate-controlled switch is not limited to the implementation of the embodiment shown in above-mentioned.
As indicated above according to embodiments of the invention, these embodiment do not have all details of detailed descriptionthe, do not limit this invention yet and only are described specific embodiment.Obviously, according to above description, can make many modifications and variations.These embodiment are chosen and specifically described to this specification, is in order to explain better principle of the present invention and practical application, thereby under making, the technical field technical staff can utilize the present invention and the modification on basis of the present invention to use well.The present invention only is subjected to the restriction of claims and four corner and equivalent.
Claims (10)
1. the LED drive circuit of a tunable optical adjustable color temperature, in order to drive the LED lighting device that is comprised of N paths of LEDs lamp string, N 〉=2 is characterized in that, the LED drive circuit of described tunable optical adjustable color temperature comprises a constant current generating circuit, and a buffer circuit, is selected circuit and a control circuit; Wherein,
Described control circuit produces according to light modulation and the color-temperature regulating requirement of described LED lighting device the state that corresponding control signal is controlled described constant current generating circuit and described selection circuit;
Described constant current generating circuit receives DC input voitage and described control signal, drives described LED lighting device to produce constant output current;
Described buffer circuit is connected to the output of described constant current generating circuit, to limit the output voltage of described constant current generating circuit output;
Described selection circuit and described N paths of LEDs lamp series winding connect, and to select corresponding described LED lamp string according to described control signal, make described output current drive corresponding described LED lamp string.
2. the LED drive circuit of tunable optical adjustable color temperature according to claim 1, it is characterized in that, also comprise the output that is connected to described constant current generating circuit and the output capacitance between described buffer circuit, carry out filtering with the output signal to described constant current generating circuit.
3. the LED drive circuit of tunable optical adjustable color temperature according to claim 1, is characterized in that, described buffer circuit comprises the first inductance and the first electric capacity that is connected in series.
4. the LED drive circuit of tunable optical adjustable color temperature according to claim 1, it is characterized in that, described selection circuit comprises N gate-controlled switch, each described gate-controlled switch and corresponding one tunnel described LED lamp string are connected in series and form a LED branch road, the described LED branch road in N road two outputs that are connected to described buffer circuit parallel with one another.
5. the LED drive circuit of tunable optical adjustable color temperature according to claim 4, it is characterized in that, described control circuit produces N+1 described control signal, to control respectively the on off state of the power switch pipe in a described N gate-controlled switch and described constant current generating circuit.
6. the LED drive circuit of tunable optical adjustable color temperature according to claim 5, it is characterized in that, it is closed that described control circuit is controlled a described gate-controlled switch, and, control the periodic closed and shutoff of described power switch pipe, realize the monochromatic light modulation to described LED lighting device.
7. the LED drive circuit of tunable optical adjustable color temperature according to claim 5, it is characterized in that, described control circuit is controlled at least two described gate-controlled switches and is alternately closed, and, control the periodic closed and shutoff of described power switch pipe, to realize simultaneously the brightness of described LED lighting device and the adjusting of colour temperature.
8. the LED drive circuit of tunable optical adjustable color temperature according to claim 1, is characterized in that, also comprises electromagnetic interface filter and rectifier bridge, processes in order to the AC power that receives is carried out filtering and rectification, to obtain described DC input voitage.
9. the LED drive circuit of tunable optical adjustable color temperature according to claim 1, is characterized in that, described constant current generating circuit comprises a single-stage AC/DC constant-current circuit.
10. the LED drive circuit of tunable optical adjustable color temperature according to claim 1, is characterized in that, described constant current generating circuit comprises an AC/DC constant voltage circuit and a DC/DC constant-current circuit that is connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013100574016A CN103152932A (en) | 2013-04-21 | 2013-04-21 | LED (Light Emitting Diode) drive circuit capable of adjusting light and color temperature |
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|---|---|---|---|
| CN2013100574016A CN103152932A (en) | 2013-04-21 | 2013-04-21 | LED (Light Emitting Diode) drive circuit capable of adjusting light and color temperature |
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| CN2013100574016A Pending CN103152932A (en) | 2013-04-21 | 2013-04-21 | LED (Light Emitting Diode) drive circuit capable of adjusting light and color temperature |
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| CN103634986A (en) * | 2013-11-04 | 2014-03-12 | 惠州雷士光电科技有限公司 | Multipath dimming device and dimming method thereof |
| CN106208715A (en) * | 2016-08-05 | 2016-12-07 | 南京航空航天大学 | A kind of distributed power source HVDC access system and control method thereof |
| CN106922055A (en) * | 2017-04-25 | 2017-07-04 | 东莞泛美光电有限公司 | Adjustable photochromic LED drive circuit |
| WO2018113399A1 (en) * | 2016-12-20 | 2018-06-28 | 欧普照明股份有限公司 | Light source module |
| CN108337762A (en) * | 2017-01-20 | 2018-07-27 | 松下知识产权经营株式会社 | Control circuit and LED light device |
| CN110035586A (en) * | 2019-05-21 | 2019-07-19 | 横店集团得邦照明股份有限公司 | It is a kind of to realize the color circuit and its implementation of color-temperature regulating toning suitable for high efficiency |
| CN110996460A (en) * | 2019-12-27 | 2020-04-10 | 安徽乐图电子科技有限公司 | LED lighting device capable of adjusting light and color temperature |
| CN112042098A (en) * | 2018-04-16 | 2020-12-04 | 太阳食物有限公司 | Power converter for bioelectrochemical systems |
| TWI797259B (en) * | 2018-02-20 | 2023-04-01 | 晶元光電股份有限公司 | Light-emitting unit and light-emitting device using the same |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103634986A (en) * | 2013-11-04 | 2014-03-12 | 惠州雷士光电科技有限公司 | Multipath dimming device and dimming method thereof |
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| CN106208715A (en) * | 2016-08-05 | 2016-12-07 | 南京航空航天大学 | A kind of distributed power source HVDC access system and control method thereof |
| CN106208715B (en) * | 2016-08-05 | 2019-01-15 | 南京航空航天大学 | A kind of distributed generation resource high voltage direct current access system and its control method |
| WO2018113399A1 (en) * | 2016-12-20 | 2018-06-28 | 欧普照明股份有限公司 | Light source module |
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| TWI797259B (en) * | 2018-02-20 | 2023-04-01 | 晶元光電股份有限公司 | Light-emitting unit and light-emitting device using the same |
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| CN110035586A (en) * | 2019-05-21 | 2019-07-19 | 横店集团得邦照明股份有限公司 | It is a kind of to realize the color circuit and its implementation of color-temperature regulating toning suitable for high efficiency |
| CN110996460A (en) * | 2019-12-27 | 2020-04-10 | 安徽乐图电子科技有限公司 | LED lighting device capable of adjusting light and color temperature |
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Address after: 10, 310023 floor, B zone, HOLLEY Science Park, No. 181, Wuchang Road, Yuhang District, Zhejiang, Hangzhou Applicant after: Hangzhou Letu Photoelectric Technology Co., Ltd. Address before: 10, 310023 floor, B zone, HOLLEY Science Park, No. 181, Wuchang Road, Zhejiang, Hangzhou Applicant before: Hangzhou Letu Photoelectric Technology Co., Ltd. |
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Application publication date: 20130612 |