CN203167350U - LED drive circuit with capabilities of light modulation and color temperature adjustment - Google Patents
LED drive circuit with capabilities of light modulation and color temperature adjustment Download PDFInfo
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- CN203167350U CN203167350U CN 201320083063 CN201320083063U CN203167350U CN 203167350 U CN203167350 U CN 203167350U CN 201320083063 CN201320083063 CN 201320083063 CN 201320083063 U CN201320083063 U CN 201320083063U CN 203167350 U CN203167350 U CN 203167350U
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Abstract
The utility model relates to an LED drive circuit with capabilities of light modulation and color temperature adjustment, wherein the LED drive circuit is used for driving an LED illuminating device formed by N LED light strings and the N is equal to or greater than 2. The LED drive circuit comprises a constant-current generation circuit, a buffer circuit, a selection circuit and a control circuit. Specifically, the control circuit generates a corresponding control signal to control the states of the constant-current generation circuit and the selection circuit according to the light modulation and color temperature adjustment requirements of the LED illuminating device; the constant-current generation circuit receives a direct-current input voltage and the control signal so as to generate a constant output current to drive the LED illuminating device; the buffer circuit that is connected to the output terminal of the constant-current generation circuit is used for limiting the output voltage outputted by the constant-current generation circuit; and the selection circuit that is connected with the N LED light strings is used for selecting a correspond LED light string according to the control signal, so that the output current drives the corresponding LED light string.
Description
Technical field
The utility model relates to lighting field, relates 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 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.Because it is photochromic constant that the PWM light modulation has, stability advantage such as better during low-light level, and widely 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 the prior art, usually adopt the LED lamp with different color light to be packaged in the 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.
Behind AC power AC process electromagnetic interface filter 201 and the 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 the back level.
As seen, in the prior art, the led drive circuit of tunable optical adjustable color temperature all is that independently constant-current circuit drives the LED lamp string of corresponding coloured light, and the brightness of control 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
Problems such as in view of this, the purpose of this utility model is to provide a kind of led drive circuit of novel tunable optical adjustable color temperature, and is too complicated to solve in the prior art circuit structure, and 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 the utility model one embodiment, in order to drive the LED lighting device of being 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 the state that corresponding control signal is controlled described constant current generating circuit and described selection circuit according to light modulation and the warm requirement of toning of described LED lighting device;
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 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 polyphone 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 described constant current generating circuit and the output capacitance between the 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 the utility model one embodiment, wherein, buffer circuit comprises first inductance and first electric capacity that is connected in series.
Led drive circuit according to the tunable optical adjustable color temperature of the utility model one embodiment, 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 described buffer circuit parallel with one another.
Further, described control circuit produces N+1 described control signal, to control the on off state of the power switch pipe in a described N gate-controlled switch and the described constant current generating circuit respectively.
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.
Be that the led drive circuit of the tunable optical adjustable color temperature of strength also comprises electromagnetic interface filter and rectifier bridge according to the utility model, handle 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 utility model embodiment, all LED lamp strings share a constant current generating circuit.According to the toning temperature 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 utility model embodiment, not only can well realize light modulation and the toning temperature control of LED lighting device, simplify circuit structure greatly 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 the utility model first embodiment;
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;
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 the working waveform figure in when temperature toning.
Embodiment
Below in conjunction with accompanying drawing several preferred embodiments of the present utility model is described in detail, but the utility model is not restricted to these embodiment.The utility model is contained any in substituting of making of marrow of the present utility model and scope, modification, equivalent method and scheme.Understand for the public is had completely the utility model, in following the utility model preferred embodiment, describe concrete details in detail, and do not have the description of these details also can understand the utility model fully for a person skilled in the art.
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 the utility model first embodiment.
In this embodiment, the led drive circuit 300 of tunable optical adjustable color temperature is in order to drive the LED lighting device of being made up of 3 paths of LEDs lamp strings with different color 301.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 warm requirement of toning 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 filtering and rectification for the AC power AC by electromagnetic interface filter and 306 pairs of outsides of rectifier bridge and handle the back acquisition.
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 the 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 capacitance C between the output that is connected constant current generating circuit 305 and the buffering 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 first inductance L 1 and 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 the corresponding one tunnel described LED lamp string composition one LED branch road that is connected in series, 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
OutAll or part ofly flow through 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 are alternately closed, and regulate the size of the output current of constant current generating circuit 305 simultaneously, have 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 output current regulating by the periodic closed and shutoff of the power switch pipe in the control constant current generating circuit.
Come below with reference to working waveform figure that it is elaborated to the concrete control operation of control circuit 302.
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, control and the controllable switch S 1 that drive circuit 302 is controlled and LED lamp string 301-1 is in series.
Control circuit 302 output control signal PWM1 remain high level 1, thereby control controllable switch S 1 is in closure state all the time; And control signal PWM2 and control signal PWM3 remain low level 0, thereby control controllable switch S 2 and controllable switch S 3 are in off state all the time.Simultaneously, control signal PWMQ is a square-wave signal.When needs weaken the brightness of LED lighting device, reduce the duty ratio of control signal PWMQ, then the output current of constant current generating circuit 305 reduces gradually, as moment t0 to t1 constantly; When needs strengthen the brightness of LED lighting device, increase the duty ratio of control signal PWMQ, then the output current of constant current generating circuit 305 increases gradually, as moment t1 to t2 constantly, thereby realize adjusting to the brightness of LED lighting device.
With reference to figure 3C, be depicted as the light modulation of led drive circuit of the tunable optical adjustable color temperature shown in Fig. 3 A and the working waveform figure in when temperature toning.
When LED lighting device 301 being carried out simultaneously light modulation and toning temperature, the brightness of control circuit 302 controls and corresponding LED lamp string.Be example with LED lamp string 301-1 and 301-2, 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, to moment t1, control signal PWM1 is high level 1 from moment t0, 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 utility model embodiment goes for different input power supply, for example direct voltage source DC or alternating-current voltage source AC.The position of LED lamp string and gate-controlled switch relation is not limited to the implementation of the embodiment shown in above-mentioned.
As indicated above according to embodiment of the present utility model, these embodiment do not have all details of detailed descriptionthe, do not limit this utility model 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 principle of the present utility model and practical application better, thereby the technical field technical staff can utilize the utility model and the modification on the utility model basis to use well under making.The utility model only is subjected to the restriction of claims and four corner and equivalent.
Claims (8)
1. the led drive circuit of a tunable optical adjustable color temperature, in order to drive the LED lighting device of being made up 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 the state that corresponding control signal is controlled described constant current generating circuit and described selection circuit according to light modulation and the warm requirement of toning of described LED lighting device;
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 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 polyphone 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 described constant current generating circuit and the output capacitance between the 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 first inductance and 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 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 the on off state of the power switch pipe in a described N gate-controlled switch and the described constant current generating circuit respectively.
6. 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, handles in order to the AC power that receives is carried out filtering and rectification, to obtain described DC input voitage.
7. 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.
8. 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 |
|---|---|---|---|
| CN 201320083063 CN203167350U (en) | 2013-02-23 | 2013-02-23 | LED drive circuit with capabilities of light modulation and color temperature adjustment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320083063 CN203167350U (en) | 2013-02-23 | 2013-02-23 | LED drive circuit with capabilities of light modulation and color temperature adjustment |
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| Publication Number | Publication Date |
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| CN203167350U true CN203167350U (en) | 2013-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320083063 Expired - Lifetime CN203167350U (en) | 2013-02-23 | 2013-02-23 | LED drive circuit with capabilities of light modulation and color temperature adjustment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103152932A (en) * | 2013-04-21 | 2013-06-12 | 杭州乐图光电科技有限公司 | LED (Light Emitting Diode) drive circuit capable of adjusting light and color temperature |
| CN104684219A (en) * | 2015-03-09 | 2015-06-03 | 北京幻腾科技有限公司 | LED lighting device and drive circuit |
-
2013
- 2013-02-23 CN CN 201320083063 patent/CN203167350U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103152932A (en) * | 2013-04-21 | 2013-06-12 | 杭州乐图光电科技有限公司 | LED (Light Emitting Diode) drive circuit capable of adjusting light and color temperature |
| CN104684219A (en) * | 2015-03-09 | 2015-06-03 | 北京幻腾科技有限公司 | LED lighting device and drive circuit |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP02 | Change in the address of a patent holder |
Address after: 10, 310023 floor, B zone, HOLLEY Science Park, No. 181, Wuchang Road, Yuhang District, Zhejiang, Hangzhou Patentee after: Hangzhou Letu Photoelectric Technology Co.,Ltd. Address before: 10, 310023 floor, B zone, HOLLEY Science Park, No. 181, Wuchang Road, Zhejiang, Hangzhou Patentee before: Hangzhou Letu Photoelectric Technology Co.,Ltd. |
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| TR01 | Transfer of patent right |
Effective date of registration: 20191206 Address after: 310023 room 39, floor 2, building B, 168 Wuchang Avenue, Wuchang Street, Yuhang District, Hangzhou City, Zhejiang Province Patentee after: Hangzhou Ruiqi Electronics Co.,Ltd. Address before: 10, 310023 floor, B zone, HOLLEY Science Park, No. 181, Wuchang Road, Yuhang District, Zhejiang, Hangzhou Patentee before: Hangzhou Letu Photoelectric Technology Co.,Ltd. |
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| TR01 | Transfer of patent right | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130828 |
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| CX01 | Expiry of patent term |