CN103179750A - Adjustable-color-temperature dimmable LED (light emitting diode) driving circuit - Google Patents
Adjustable-color-temperature dimmable LED (light emitting diode) driving circuit Download PDFInfo
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- CN103179750A CN103179750A CN2013100575447A CN201310057544A CN103179750A CN 103179750 A CN103179750 A CN 103179750A CN 2013100575447 A CN2013100575447 A CN 2013100575447A CN 201310057544 A CN201310057544 A CN 201310057544A CN 103179750 A CN103179750 A CN 103179750A
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Abstract
The invention relates to an adjustable-color-temperature dimmable LED (light emitting diode) driving circuit. The adjustable-color-temperature dimmable LED driving circuit is used for driving an LED lighting device composed of N LED string lights, wherein N >/= 2. The adjustable-color-temperature dimmable LED driving circuit comprises an energy storage element and N first working paths and second working paths corresponding to the N LED string lights. The energy storage element is shared by the first working paths and the second working paths. According to the adjustable-color-temperature and dimmable requirements of the LED lighting device, when in a first working state, the second working paths are in a disconnection state, at least two first working paths are alternately conducted to receive an input power supply to supply driving power to the corresponding LED string lights; and when in a second working state, the N first working paths are in a disconnection state, and the second working paths are in a conducting state to release the storage energy of the energy storage element.
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.
Electromagnetic interface filter 101 and AC/DC constant voltage circuit 102 are converted to constant direct voltage VDC with the AC power AC of input side, provide the power supply supply to give DC/DC constant-current circuit 103.
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 single-stage AC/DC constant-current 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 single-stage AC/DC constant-current circuits 203 of giving rear class.
MCU controller 204 produces corresponding control signal PWM1-PWMn according to light modulation and color-temperature regulating requirement, to control respectively single-stage AC/DC constant-current circuit 203-1-203-n, drives a corresponding LED lamp string thereby produce corresponding output current.
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, complicated to solve in prior art circuit structure, the problem that control mode is loaded down with trivial details and the Circuits System utilance is low.
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 comprise an energy-storage travelling wave tube, with described N paths of LEDs lamp string N road the first operating path and the second operating path one to one; Wherein,
Described the first operating path and described the second operating path share described energy-storage travelling wave tube;
Light modulation and color-temperature regulating demand according to described LED lighting device, when the first operating state, described the second operating path is in off-state, and described the first operating path alternate conduction of two-way to receive an input power, provides drive current for corresponding described LED lamp string at least;
When the second operating state, described the first operating path in N road all is in off-state, and described the second operating path is in conducting state, to discharge the energy storage of described energy-storage travelling wave tube.
Further, each described first operating path comprises a power switch pipe that is connected in series in successively described input power two ends, described energy-storage travelling wave tube, described LED lamp string and a gate-controlled switch of a correspondence; Described the first operating path in N road shares described power switch pipe and described energy-storage travelling wave tube; When the first operating state, described power switch pipe is in closure state, and at least two described gate-controlled switch alternate conduction are so that described LED lighting device has corresponding brightness and colour temperature.
Further, connection parallel with one another between the LED branch road of the described gate-controlled switch composition of described LED lamp string and correspondence.
Further, described the second operating path comprises the first diode, the second diode; Wherein, described the first diode is connected between the negative terminal of the public connecting end of described power switch pipe and described energy-storage travelling wave tube and described input power; Described the second diode is connected between the anode of the other end of described energy-storage travelling wave tube and described input power.
And when the second operating state, the energy storage of described energy-storage travelling wave tube is by described the second diode, and described input power and described the first diode release energy.
Preferably, the LED drive circuit of described tunable optical adjustable color temperature also comprises the input capacitance that is connected in parallel with described input power.
Preferably, described energy-storage travelling wave tube comprises a magnetic element.
LED drive circuit according to the tunable optical adjustable color temperature of the embodiment of the present invention, it is by one group of power stage circuit based on the buck topological structure, by the time-sharing multiplex to the energy storage path of described power stage circuit, select the LED branch road of demand motive, and the size of its drive current is regulated, thereby realized light modulation and the color-temperature regulating of LED lighting device are operated.According to the LED drive circuit of the tunable optical adjustable color temperature of the embodiment of the present invention, circuit structure is simple, and the components and parts number is less, and control program is simplified, and has reduced and has realized cost, has also greatly reduced 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;
Working waveform figure when Fig. 3 B is depicted as the light modulation color-temperature regulating mode of operation of LED drive circuit of the tunable optical adjustable color temperature of the present invention of the foundation shown in Fig. 3 A;
Figure 4 shows that the theory diagram according to the LED drive circuit of the tunable optical adjustable color temperature of second embodiment of the invention.
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 driving by 3 paths of LEDs lamp string 301-1, the LED lighting device 301 that 301-2 and 301-3 form.The LED drive circuit 300 of tunable optical adjustable color temperature comprises an inductance L o(energy-storage travelling wave tube), with 3 paths of LEDs lamp strings 3 tunnel first operating paths and the second operating path one to one; Wherein, described the first operating path and described the second operating path share inductance L o.
Light modulation and color-temperature regulating demand according to described LED lighting device, when the first operating state, described the second operating path is in off-state, and described the first operating path alternate conduction of two-way to receive an input power DC, provides drive current for corresponding described LED lamp string at least;
When the second operating state, described the first operating path in N road all is in off-state, and described the second operating path is in conducting state, to discharge the energy storage of described energy-storage travelling wave tube.
Concrete, in this embodiment, each described first operating path comprises anode and the power switch pipe Q between negative terminal, inductance L o and a LED branch road that is connected in series in successively input power DC.Connection parallel with one another between three paths of LEDs branch roads, and each LED branch road comprises the gate-controlled switch of a LED lamp string and a correspondence.For example, a LED branch road comprises that LED lamp string 301-1 and controllable switch S 1, the two LED branch road comprise that LED lamp string 301-2 and controllable switch S 2, the three LED branch roads comprise LED lamp string 301-3 and controllable switch S 3.
Driving circuits 302 produces 4 control signal PWMQ according to light modulation and the color temperature information of LED lighting device 301, PWM1, and PWM2 and PWM3 come power ratio control switching tube Q and N controllable switch S 1 respectively, the switch motion of S2 and S3.
When the first operating state, power switch pipe Q is in closure state, and at least two gate-controlled switch alternate conduction are so that LED lighting device 301 has corresponding brightness and colour temperature.
Concrete, in this embodiment, the second operating path comprises the first diode D1, the second diode D2; Wherein, the first diode D1 is connected between the negative terminal of the public connecting end B of power switch pipe Q and inductance L o and input power DC; The second diode D2 is connected between the anode of the other end A of inductance L o and input power DC.
When the second operating state, the energy storage of inductance L o is by the second diode D2, and input power DC and the first diode D1 release energy.
Preferably, the LED drive circuit 300 of tunable optical adjustable color temperature also comprises the input capacitance Cin that is connected in parallel with input power DC, processes input power DC is carried out filtering.
The order of connection between LED lamp string and gate-controlled switch is not subjected to the restriction of above-mentioned disclosed embodiment, and those skilled in the art can learn, the order of LED lamp string and gate-controlled switch can be carried out respective change.
The specific works principle of the LED drive circuit of the tunable optical adjustable color temperature when describing the different operating state in detail below with reference to concrete working waveform figure.
With reference to figure 3B, the working waveform figure when being depicted as the light modulation of LED drive circuit 300 of tunable optical adjustable color temperature and color-temperature regulating mode of operation.As effectively, be invalid during for low level 0 in the time of below will be take control signal as high level 1, and light modulation and color-temperature regulating operation describe as an example of LED lamp string 301-1 and 301-2 example.
Driving circuits 302 is according to light modulation and the color-temperature regulating information of LED lighting device 301, output control signal PWMQ comes the on off state of power ratio control switching tube Q, and control signal PWM1 controls the on off state of controllable switch S 1, and control signal PWM2 controls the on off state of controllable switch S 2.
From moment t0 to moment t2, control signal PWMQ is maintained high level, and power switch pipe Q is in closure state.Simultaneously, control signal PWM3 is maintained low level, and controllable switch S 3 is in off-state.And from moment t0 to t1 constantly, control signal PWM1 is high level, controllable switch S 1 closure, and therefore by power switch pipe Q, inductance L o in the first operating path that LED lamp string 301-1 and controllable switch S 1 form, flows through the inductive current i of inductance L o
LWith the current i that flows through LED lamp string 301-1
301-1Identical, all keep lasting the rising with certain slope, carry out energy storage to give inductance L o, and drive current is provided for LED lamp string 301-1, LED lamp string 301-1 has corresponding brightness and colour temperature.
And from moment t1 to moment t2, control signal PWM1 becomes low level, and controllable switch S 1 disconnects.Control signal PWM2 is high level, controllable switch S 2 closures, and therefore by power switch pipe Q, inductance L o in the first operating path that LED lamp string 301-2 and controllable switch S 2 form, flows through the inductive current i of inductance L o
LWith the current i that flows through LED lamp string 301-1
301-2Identical, all keep lasting the rising with certain slope, carry out energy storage to give inductance L o, and drive current is provided for LED lamp string 301-2, LED lamp string 301-2 has corresponding brightness and colour temperature.By aforesaid operations, LED lighting device 301 shows as corresponding brightness and colour temperature.
From moment t2 to moment t3, control signal PWMQ, PWM1, PWM2 and PWM3 all become low level, power switch pipe Q, and controllable switch S 1, S2 and S3 all are maintained off state.The electric current of LED lamp string drops to zero.By the second diode D2, input power DC in the second operating path that the first diode D1 forms, flows through the inductive current i of inductance L o
LContinuous decrease, inductance L o releases energy.
With reference to figure 4, be depicted as the theory diagram according to the LED drive circuit of the tunable optical adjustable color temperature of second embodiment of the invention.Different from the embodiment shown in Fig. 3 A is that in this embodiment, the second operating path of the LED drive circuit 400 of tunable optical adjustable color temperature shares diode D4, has further simplified the structure of Circuits System.Embodiment shown in its operation principle and Fig. 3 A is similar, does not repeat them here.
In addition, the LED according to the tunable optical adjustable color temperature of the embodiment of the present invention drives the application scenario that goes for different input powers.For example, in the embodiment shown in Fig. 3 A, input power is direct voltage source, and in the present embodiment, input power is AC power AC, after the processing through electromagnetic interface filter 401 and rectifier bridge 402, is converted to direct voltage, then provides the power supply supply to subsequent conditioning circuit.
To sum up, LED drive circuit according to the tunable optical adjustable color temperature of the embodiment of the present invention is no longer traditional buck type power stage circuit, by the improvement to buck type power stage circuit, switching sequence and ON time length by power ratio control switching tube and gate-controlled switch, give different LED branch roads with the energy distribution in energy storage stage, realize control and adjusting to the electric current that flows through LED lamp string, thereby realized light modulation and color-temperature regulating operation to the LED lighting device.In addition, LED drive circuit according to the tunable optical adjustable color temperature of the embodiment of the present invention by the configuration of the second diode, has changed traditional path that releases energy, make the energy of release no longer be passed to the LED branch road, but by with LED branch road irrelevant another path, energy being discharged.
Need to prove, the device function that between each embodiment of the present invention, title is identical is also identical.And; the structure of the circuit of the second operating path comprises but is not limited to above disclosed form; as long as can realize the function of the described interlock circuit of the embodiment of the present invention; therefore; the relevant improvement that those skilled in the art do on the basis of the disclosed circuit of the embodiment of the present invention is also within the protection range of the embodiment of the present invention.
In addition, also need to prove, in this article, relational terms such as the first and second grades only is used for an entity or operation are separated with another entity or operating space, and not necessarily requires or hint and have the relation of any this reality or sequentially between these entities or operation.And, term " comprises ", " comprising " or its any other variant are intended to contain comprising of nonexcludability, thereby make the process, method, article or the equipment that comprise a series of key elements not only comprise those key elements, but also comprise other key elements of clearly not listing, or also be included as the intrinsic key element of this process, method, article or equipment.In the situation that not more restrictions, the key element that is limited by statement " comprising ... ", and be not precluded within process, method, article or the equipment that comprises described key element and also have other identical element.
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 (8)
1. the LED drive circuit of a tunable optical adjustable color temperature, 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 an energy-storage travelling wave tube, with described N paths of LEDs lamp string N road the first operating path and the second operating path one to one; Wherein,
Described the first operating path and described the second operating path share described energy-storage travelling wave tube;
Light modulation and color-temperature regulating demand according to described LED lighting device, when the first operating state, described the second operating path is in off-state, and described the first operating path alternate conduction of two-way to receive an input power, provides drive current for corresponding described LED lamp string at least;
When the second operating state, described the first operating path in N road all is in off-state, and described the second operating path is in conducting state, to discharge the energy storage of described energy-storage travelling wave tube.
2. the LED drive circuit of tunable optical adjustable color temperature according to claim 1, it is characterized in that, each described first operating path comprises a power switch pipe that is connected in series in successively described input power two ends, described energy-storage travelling wave tube, one tunnel described LED lamp string and a gate-controlled switch; Described the first operating path in N road shares described power switch pipe and described energy-storage travelling wave tube; When the first operating state, described power switch pipe is in closure state, and at least two described gate-controlled switch alternate conduction are so that described LED lighting device has corresponding brightness and colour temperature.
3. the LED drive circuit of tunable optical adjustable color temperature according to claim 2, is characterized in that, connection parallel with one another between the LED branch road that described LED lamp string and corresponding described gate-controlled switch form.
4. the LED drive circuit of tunable optical adjustable color temperature according to claim 2, is characterized in that, described the second operating path comprises the first diode and the second diode; Wherein, described the first diode is connected between the negative terminal of the public connecting end of described power switch pipe and described energy-storage travelling wave tube and described input power; Described the second diode is connected between the anode of the other end of described energy-storage travelling wave tube and described input power.
5. the LED drive circuit of tunable optical adjustable color temperature according to claim 4, is characterized in that, when the second operating state, the energy storage of described energy-storage travelling wave tube is by described the second diode, and described input power and described the first diode release energy.
6. the LED drive circuit of tunable optical adjustable color temperature according to claim 1, is characterized in that, also comprises the input capacitance that is connected in parallel with described input power.
7. the LED drive circuit of tunable optical adjustable color temperature according to claim 1, is characterized in that, described energy-storage travelling wave tube comprises a magnetic element.
8. the LED drive circuit of tunable optical adjustable color temperature according to claim 1, it is characterized in that, also comprise a driving circuits, described driving circuits is according to light modulation and the color temperature information of described LED lighting device, produce N+1 control signal, control respectively the switch motion of described power switch pipe and N described gate-controlled switch.
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| CN2013100575447A CN103179750A (en) | 2013-04-21 | 2013-04-21 | Adjustable-color-temperature dimmable LED (light emitting diode) driving circuit |
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| CN2013100575447A CN103179750A (en) | 2013-04-21 | 2013-04-21 | Adjustable-color-temperature dimmable LED (light emitting diode) driving circuit |
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Cited By (3)
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| CN104768270A (en) * | 2014-01-02 | 2015-07-08 | 深圳市海洋王照明工程有限公司 | Synchronous shutdown LED boost driving circuit |
| CN104486860B (en) * | 2014-11-12 | 2018-03-09 | 肖志军 | A kind of LED light adjusting circuit |
| CN108886852A (en) * | 2016-03-11 | 2018-11-23 | 艾德拉博支持有限公司 | Modular lighting application |
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| CN103152933A (en) * | 2013-02-23 | 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 |
| CN203104906U (en) * | 2013-02-23 | 2013-07-31 | 杭州乐图光电科技有限公司 | LED (light emitting diode) driving circuit capable of adjusting light and color temperature |
| CN203104905U (en) * | 2013-02-23 | 2013-07-31 | 杭州乐图光电科技有限公司 | LED (light emitting diode) driving circuit capable of adjusting light and color temperature |
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- 2013-04-21 CN CN2013100575447A patent/CN103179750A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102684483A (en) * | 2012-05-16 | 2012-09-19 | 杭州乐图光电科技有限公司 | Control circuit of switch-type adjuster and control method thereof |
| CN103152933A (en) * | 2013-02-23 | 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 |
| CN203104906U (en) * | 2013-02-23 | 2013-07-31 | 杭州乐图光电科技有限公司 | LED (light emitting diode) driving circuit capable of adjusting light and color temperature |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104768270A (en) * | 2014-01-02 | 2015-07-08 | 深圳市海洋王照明工程有限公司 | Synchronous shutdown LED boost driving circuit |
| CN104486860B (en) * | 2014-11-12 | 2018-03-09 | 肖志军 | A kind of LED light adjusting circuit |
| CN108886852A (en) * | 2016-03-11 | 2018-11-23 | 艾德拉博支持有限公司 | Modular lighting application |
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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: 20130626 |