CN104540287A - LED dimming driving circuit - Google Patents
LED dimming driving circuit Download PDFInfo
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- CN104540287A CN104540287A CN201410829583.9A CN201410829583A CN104540287A CN 104540287 A CN104540287 A CN 104540287A CN 201410829583 A CN201410829583 A CN 201410829583A CN 104540287 A CN104540287 A CN 104540287A
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Abstract
The invention relates to an LED dimming driving circuit. The LED dimming driving circuit comprises a rectification unit and N levels of LED direct-current driving circuits. The ith level of LED direct-current driving circuit is composed of an ith voltage sampling unit, an ith switching unit and an ith LED light source module. The N is a natural number and can be anyone in 1, 2, 3, ..., N. A first end of the ith voltage sampling unit and an input end of the ith LED light source module are jointly connected to a first output end of the rectification unit when the i is equal to one, and the first end of the ith voltage sampling circuit and the input end of the ith LED light source module are jointly connected to an output end of the (i-1)th LED light source module when the i is not equal to one. A second end of the ith voltage sampling unit is grounded, and a voltage-splitting end of the ith voltage sampling unit is connected to a second input end of the ith switching unit. A first input end of the ith switching unit is connected to an output end of the ith LED light source module, and an output end of the ith switching unit and a second output end of the rectification unit are grounded. The LED dimming driving circuit is compatible with a traditional triac dimmer, does not need additional independent wire arrangement, and achieves adjustment of luminance or color temperature or colors.
Description
The divisional application that the present invention is original applying number is 201210424253.2, original application day is on October 30th, 2012, former denomination of invention is the dimming driving circuit of the direct driving LED module of alternating current.
Technical field
The present invention relates to lighting field, particularly relate to a kind of LED dimming driving circuit of compatible silicon controlled dimmer.
Background technology
LED, as a kind of New Solid light source, is expected to become lighting source of new generation with advantages such as its energy-saving and environmental protection, life-span length.As everyone knows, LED is direct voltage drive, and our productive life electricity consumption exchanges cycle electricity.Therefore, want normally to light LED, need a power supply changeover device, realize the function of rectification and step-down.The introducing of power supply changeover device, brings a lot of negative effect.One, the life-span of power supply changeover device, well below the life-span of LED self, makes shorten the useful life of light-emitting device; Its two, power supply changeover device can reduce the efficiency of light-emitting device; Its three, in low-power applications, power supply changeover device can cause the decline of power factor and the increase of current total harmonic.In order to give full play to the intrinsic advantage of LED, people have invented the LED light emission device can using alternating electromotive force Direct driver.
In the technical scheme that known LED drives, when the traditional controllable silicon dimmer of compatibility, be only conceived to copy traditional brightness control function, and have ignored the colour temperature of LED, the feature of Color tunable.In addition, the direct driving LED technical scheme of current alternating current is use plurality of LEDs assembly to be formed by connecting according to the circuit topological structure of reverse parallel connection or bridge rectifier, to meet the driving requirement of alternating electromotive force mostly.But alternating current fluctuates according to certain frequency period, due to the existence of LED self cut-in voltage, when instantaneous voltage exceedes cut-in voltage, LED just meeting conducting is also luminous; Otherwise LED is that cut-off is non-luminous.This circuit makes the luminous efficiency of LED very low, and when AC voltage fluctuations, there will be light-emitting flash phenomenon.
Chinese patent CN 102202441A discloses the constant-current controller topological circuit that a kind of LED illumination lamp AC power is directly powered, and it comprises EMI circuit, rectification circuit, circuit of power factor correction and constant-current drive circuit.Its working method is: circuit of power factor correction changes the conducting state of power factor control circuit 31 and 32 according to the large minizone of input ac voltage, and the quantity of lighting of LED illumination lamp is changed, thus improves power factor.When real work, if the switch of power factor control circuit 31,32 equivalence reaches 1/3,2/3 crest voltage time will switch immediately, improve power factor with this.See Fig. 1, in power factor control circuit 31,32, the conducting state of K1, K2 is only by the impact of the voltage on the circuit of corresponding biasing resistor R6, R7 or R8, R9 composition.
And the i-th switch element receives the i-th cut-in voltage and dividing potential drop termination through the i-th voltage sampling unit receives the i-th shutoff voltage through the i-th LED light source module in the present invention.Every one-level LED light source module has similar and different colour temperature and color, and the parameter arranging voltage sampling unit in every one-level LED drive circuit carrys out the turn-off time of control switch unit, thus the colour temperature of adjustment LED and color.Therefore, the on off operating mode of breaker in middle unit of the present invention is subject to the joint effect of cut-in voltage and shutoff voltage.Further, the present invention does not adopt the conventional switching over topological circuit disclosed in above-mentioned documents, but adopts switch element to receive cut-in voltage and shutoff voltage from the LED light source module output of correspondence and voltage sampling unit dividing potential drop termination.Switch element receives the cut-in voltage and conducting that reach threshold value, and maintains conducting state until the shutoff voltage received reaches its threshold value and makes it turn off.Each switch element can maintain specific ON time as required, thus meets the demand of LED colour temperature and color adjustment.
The connected mode of the constant-current circuit input in the connected mode of switch element of the present invention two inputs and documents exists obviously to be distinguished, and switch element is also distinct with the particular circuit configurations of constant current unit in documents: in constant-current source 42, the grid of metal-oxide-semiconductor V2 is connected point pressure side of R3 and R4, the grid of breaker in middle unit M2 of the present invention connects R5.There is aforesaid difference in the working method that these structural differences result in the present invention and documents.
In sum, the technical problem that aforementioned comparison's file solves is how to improve the power factor exchanging driving LED, and the technical problem that the present invention solves is how to exchange the colour temperature and the color that regulate LED under driving, compatible silicon controlled adjustment simultaneously.The technical problem that both solve is different, and the technological means adopted, the working method of drive circuit is also different.Therefore, aforementioned comparison's file does not have technology to enlighten to the present invention.
Summary of the invention
The object of this invention is to provide the circuit of a kind of alternating current direct driving LED light source module, especially a kind of dimming driving circuit of compatible silicon controlled dimmer.
According to an aspect of the present invention, provide a kind of alternating current dimming driving circuit for LED, comprising: rectification unit and by the first voltage sampling unit, the first order LED DC drive circuit of the first switch element and the first LED light source module composition; Rectification unit receives alternating current, carries out rectification and output dc voltage to the alternating current received; The direct voltage of output is outputted to the input of the first LED light source module and the first end of the first voltage sampling unit through the first output by rectification unit, the output of the first LED light source module is connected to the first switch element first input end, and point pressure side of the first voltage sampling unit is connected to the second input of the first switch element; Second output head grounding of the second end of the first voltage sampling unit, the output of the first switch element and rectification unit; First switch element receives the first cut-in voltage and dividing potential drop termination through the first voltage sampling unit receives the first shutoff voltage through the first LED light source module; When the first cut-in voltage rising reaches the first turn on voltage threshold of the first switch element, the first switch element is connected and the first LED light source module continuous illumination; When the first shutoff voltage received is elevated to the first shutoff voltage threshold value of the first switch element, the first switch element turns off, and the first LED light source module is stopped luminous.
Wherein, the inner parameter by arranging the first switch element adjusts the first shutoff voltage threshold value.
Wherein, the alternating current dimming driving circuit for LED comprises further:
Input protection unit, its input is connected to alternating current, and output is connected to the input of rectification unit.
Wherein, the first LED light source module comprises:
The LED luminescence unit of multiple series connection;
The LED luminescence unit of multiple parallel connection; Or
Multiple string the LED luminescence unit of series-parallel connection.
Wherein, the first voltage sampling unit comprises:
First resistance, its one end is connected to the first output of described rectification unit;
Second resistance, its one end be connected to the first resistance the other end and as point pressure side of each voltage sampling unit, the other end ground connection of the second resistance.
Wherein, the resistance by arranging the first and second resistance adjusts the turn-off time of the first switch element.
Wherein, the first switch element comprises the 3rd to the 5th resistance, the first and second voltage stabilizing didoes and the first and second field effect transistor, wherein
One end of 3rd resistance is connected to described point pressure side;
The negative terminal of the first voltage stabilizing didoe and described point of press bond, positive ending grounding;
The grid of the first field effect transistor is connected to the other end of the 3rd resistance, source ground;
One end of the drain electrode of the first field effect transistor, one end of the 4th resistance, the 5th resistance, the negative terminal of the second voltage stabilizing didoe connect;
The other end of the 5th resistance is connected with the grid of the second field effect transistor; The negative terminal of the drain electrode of the second field effect transistor, the other end of the 4th resistance, the first LED light source module connects;
The anode of the second voltage stabilizing didoe and the source ground of the second field effect transistor.
Further, the alternating current dimming driving circuit for LED comprises: controllable silicon dimmer, is connected in series between alternating current fire wire and described rectification unit.
Further, the alternating current dimming driving circuit for LED comprises: controllable silicon dimmer, is connected in series between alternating current fire wire and described input protection unit.
According to another aspect of the present invention, provide a kind of alternating current dimming driving circuit for LED, it is characterized in that, comprising: rectification unit and N level LED DC drive circuit, i-th grade of LED DC drive circuit is by the i-th voltage sampling unit, i-th switch element and the i-th LED light source module composition, N be greater than 1 natural number, i=2,3,, N;
Rectification unit receives alternating current, carries out rectification and output dc voltage to the alternating current received;
The first end of the i-th voltage sampling unit and the input of the i-th LED light source module are connected to the first output of rectification unit jointly when i is 1, be jointly connected to the output of the i-th-1LED light source module when i is not 1; Second end ground connection of the i-th voltage sampling unit, point pressure side of the i-th voltage sampling unit is connected to the second input of the i-th switch element;
The first input end of the i-th switch element is connected to the output of the i-th LED light source module, the output of the i-th switch element and the second output head grounding of rectification unit;
I-th switch element receives the i-th cut-in voltage and dividing potential drop termination through the i-th voltage sampling unit receives the i-th shutoff voltage through the i-th LED light source module;
When the i-th cut-in voltage raise reach the i-th turn on voltage threshold of the i-th switch element time, the i-th switch element is connected and the 1 to the i-th LED light source module continuous illumination, makes i-th+1 to the input and output terminal shortcircuit of N level LED DC drive circuit simultaneously; When the i-th shutoff voltage received is elevated to the i-th shutoff voltage threshold value of the i-th switch element, i-th switch element turns off, and make the i-th+1 cut-in voltage of the i-th+1 switch element be elevated to the i-th+1 turn on voltage threshold when i is less than N, thus the 1 to the i-th+1LED light source module is luminous, the 1st is made to stop luminescence to N LED light source module when i equals N.
Wherein, every one-level LED light source module has similar and different colour temperature and color;
The inner parameter of the voltage sampling unit in every one-level LED DC drive circuit is set, to make i LED light source module illuminated in combination, realizes default colour temperature or color adjustment.
Wherein, the i-th LED light source module comprises:
The LED luminescence unit of multiple series connection;
The LED luminescence unit of multiple parallel connection; Or
Multiple string the LED luminescence unit of series-parallel connection.
Further, the alternating current dimming driving circuit for LED comprises: input protection unit, and its input is connected to alternating current, and output is connected to the input of rectification unit.
Wherein, each voltage sampling unit comprises:
First resistance, its one end is connected to the first output of described rectification unit;
Second resistance, its one end be connected to the first resistance the other end and as point pressure side of each voltage sampling unit, the other end ground connection of the second resistance.
Wherein, the resistance by arranging the first and second resistance adjusts the turn-off time of the switch element in every one-level LED DC drive circuit.
Wherein, each switch element comprises the 3rd to the 5th resistance, the first and second voltage stabilizing didoes and the first and second field effect transistor, wherein
One end of 3rd resistance is connected to described point pressure side;
The negative terminal of the first voltage stabilizing didoe and described point of press bond, positive ending grounding;
The grid of the first field effect transistor is connected to the other end of the 3rd resistance, source ground;
One end of the drain electrode of the first field effect transistor, one end of the 4th resistance, the 5th resistance, the negative terminal of the second voltage stabilizing didoe connect;
The other end of the 5th resistance is connected with the grid of the second field effect transistor; The negative terminal of the drain electrode of the second field effect transistor, the other end of the 4th resistance, the first LED light source module connects;
The anode of the second voltage stabilizing didoe and the source ground of the second field effect transistor.
Further, the alternating current dimming driving circuit for LED comprises: controllable silicon dimmer, is connected in series between alternating current fire wire and described rectification unit.
Further, the alternating current dimming driving circuit for LED comprises: controllable silicon dimmer, is connected in series between alternating current fire wire and described input protection unit.
In the present invention, when the instantaneous value of alternating voltage reaches the cut-in voltage of each LED light source module, switching means conductive, LED light source module starts luminescence; When the instantaneous value of alternating voltage exceedes default shutoff voltage, switch element turns off, and corresponding next stage LED light source module also starts luminescence.When regulating the knob of controllable silicon dimmer, the silicon controlled angle of flow changes, and makes the LED light source module of each different-colour or different colours luminous alone or in combination, realizes colour temperature or the Color tunable of whole circuit; When there is fluctuation in alternating electromotive force, within normal operating voltage range, namely, time between the cut-in voltage and default shutoff voltage of LED light source module, the time point of the just turn-on and turn-off of switch element changed, the luminescence of LED light source module does not change.Therefore, occur fluctuation at alternating electromotive force, this device there will not be light-emitting flash phenomenon.
Outstanding advantages of the present invention is: the dimming driving circuit using alternating current direct driving LED module, compatible traditional controllable silicon dimmer, need not independent wiring in addition, realizes the adjustment of brightness, colour temperature or color; Circuit is simple, and volume is little, lightweight, and cost is low.Input protection unit, improves reliability and the fail safe of device, enhances the ability of anti-electromagnetic disturbance, reduce the electromagnetic interference to electrical network.Sampling resistor network, the conducting of control switch unit or shutoff, by a preset suitable shutoff voltage, realize alternating electromotive force Direct driver LED matrix and can not glimmer when AC voltage fluctuations.Further, when the instantaneous voltage of alternating electromotive force is too high, switch element turns off, and LED light source module is not luminous, improves the utilization ratio of power supply, reduces power consumption.Meanwhile, the situation also avoiding LED light source module to burn because electric current is excessive, extends the useful life of device.
Accompanying drawing explanation
Fig. 1 shows the principle schematic of the alternating current dimming driving circuit for LED of one embodiment of the present of invention.
Fig. 2 shows the exemplary circuit figure of the alternating current dimming driving circuit for LED of Fig. 1.
Fig. 3 shows in accordance with another embodiment of the present invention for the alternating current dimming driving circuit principle schematic of LED.
Fig. 4 shows the exemplary circuit figure of the alternating current dimming driving circuit for LED embodiment illustrated in fig. 3.
Embodiment
For making object of the present invention, technical scheme and advantage clearly understand, enumerate preferred embodiment referring to accompanying drawing, the present invention is described in more detail.But it should be noted that, the many details listed in specification are only used to make reader to have a thorough understanding, even if do not have these specific details also can realize these aspects of the present invention to one or more aspect of the present invention.
Fig. 1 shows the principle schematic of the alternating current dimming driving circuit for LED of one embodiment of the present of invention.As shown in Figure 1, alternating current dimming driving circuit comprises rectification unit 12, the first voltage sampling unit 14, first switch element 16 and the first LED light source module 18.Rectification unit 12 comprises four diodes, and 4 diodes form bridge rectifier.Alternatively, rectification unit 12 also can be the rectification unit of other circuit structures.Rectification unit 12 receives alternating current and carries out rectification to alternating current.Direct voltage after rectification is outputted to the input of the first LED light source module 18 and the first end of the first voltage sampling unit 14 through the first output and anode by rectification unit 12.The output of the first LED light source module 18 is connected to the first input end of the first switch element 16, and point pressure side of the first voltage sampling unit 14 is connected to the second input of the first switch element 16.Second end of the first voltage sampling unit 14, the output of the first switch element 16 and the second output of rectification unit 12 and negativing ending grounding.First switch element 16 receives the first cut-in voltage and dividing potential drop termination through the first voltage sampling unit 14 receives the first shutoff voltage through the first LED light source module 18.When the first cut-in voltage rising reaches the first turn on voltage threshold of the first switch element 16, the first switch element 16 is connected and the first LED light source module 18 continuous illumination.When the first received shutoff voltage is elevated to the first shutoff voltage threshold value of the first switch element 16, the first switch element 16 turns off, and makes the first LED light source module 18 stop luminescence.In the present invention, by arrange the first voltage sampling unit 14 inner parameter thus adjustment point pressure side output voltage, adjust the first switch element 16 the first shutoff voltage threshold value thus adjust the turn-off time.
In the present invention, LED light source module is made up of the LED luminescence unit of multiple series connection, also can be made up of the LED luminescence unit of multiple parallel connection, or be made up of the LED luminescence unit of multi-series and parallel series-parallel connection.LED light source module can be identical or different colour temperature, also can be the LED light source module of identical or different color.
Alternatively, as shown in Figure 1, in order to protect whole electric current, alternating current dimming driving circuit also comprises input protection unit 10.The input of input protection unit 10 is connected to alternating current, and output is connected to the input of rectification unit 12.It will be appreciated by those skilled in the art that input protection unit is not necessary.Input protection unit 10 provides basic defencive function to whole circuit, is made up of piezo-resistance, thermistor, fuse, also can comprise common mode choke and gas discharge tube when being applied to particular surroundings.
Further, alternating current dimming driving circuit also comprises the first and second alternating current binding posts.Alternating current is input to input protection unit 10 through the first and second AC terminal.
Fig. 2 shows the exemplary circuit figure of the alternating current dimming driving circuit for LED of Fig. 1.As shown in Figure 2, input protection unit 10 is made up of fuse and piezo-resistance VR.As previously mentioned, also input protection unit 10 can not be comprised.First voltage sampling unit 14 is made up of the first and second resistance R1 and R2.First switch element is made up of two field effect transistor MOSFET, 3 resistance and two voltage stabilizing didoes.First alternating current binding post is connected with one end of fuse FUSE, and as alternating electromotive force live wire end L, the second alternating current binding post is connected with an ac input end of the rectifier bridge in piezo-resistance VR one end and rectification unit, as alternating current zero line side N.Another of the fuse other end and the other end of piezo-resistance VR and the rectifier bridge of rectification unit 12 exchanges to hold and is connected.The output plus terminal of rectifier bridge is connected with one end of the first resistance R1, is connected to the anode of the first LED light source module simultaneously, the output negativing ending grounding of rectifier bridge.The other end of the first resistance R1 is connected with the negative terminal of one end of the second resistance R2, the first voltage stabilizing didoe DZ1, one end of the 3rd resistance R3; The other end of the 3rd resistance R3 is connected with the grid of the first field effect transistor M1; One end of the drain electrode of the first field effect transistor M1, one end of the 4th resistance R4, the 5th resistance R5, the negative terminal of the second voltage stabilizing didoe DZ2 connect; The other end of the 5th resistance R5 is connected with the grid of the second field effect transistor M2; The negative terminal of the drain electrode of the second field effect transistor M2, the other end of the 4th resistance R4, the first LED light source module connects.The other end of the second resistance R2, the anode of the first voltage stabilizing didoe DZ1, the anode of the second voltage stabilizing didoe DZ2, the source electrode of the first field effect transistor M1, the source electrode of the second field effect transistor M2 are connected to ground.
In the embodiment of Fig. 2, be connected with AC network by plug.Alternating current through input protection unit, and is supplied to the first voltage sampling unit, the first switch element and the first LED light source module after being rectified into direct current by rectification unit.In each ac cycle, rectifier bridge output voltage is started from scratch rising, and when voltage is elevated to the first cut-in voltage of the first switch element, the first field effect transistor M1 turns off, and the second field effect transistor M2 conducting, the first LED light source module starts luminescence.Along with input voltage raises, the electric current that one LED module passes through increases, when the voltage that point pressure side of the first sampling unit exports is lower than the shutoff voltage threshold value preset, the undertension of point pressure side output of the first voltage sampling unit is to make the first field effect transistor M1 conducting, M1 keeps turning off, second field effect transistor M2 keeps conducting, the first LED light source module continuous illumination.When voltage continues to raise; when the voltage causing point pressure side of the first voltage sampling unit to export exceedes the first default shutoff voltage threshold value; first field effect transistor M1 starts conducting; second field effect transistor M2 turns off; first LED light source module is not luminous, protects the first LED light source module from the impact of big current.As previously mentioned, by arranging the resistance of the first resistance R1 in the first voltage sampling unit and the second resistance R2, the ON time of adjustable first field effect transistor M1, thus adjustment the first shutoff voltage threshold value.Alternatively, embodiment breaker in middle pipe above realizes with field effect transistor M1, M2, and those skilled in the art can use bipolar junction crystal formation transistor BJT or other switching devices with equivalent efficacy to replace field effect transistor to realize the present invention.It will be appreciated by those skilled in the art that the pressure drop between drain electrode and source electrode is very little, is namely in short-circuit condition when field effect transistor conducting (namely the first switch element is connected).
Fig. 3 shows in accordance with another embodiment of the present invention for the alternating current dimming driving circuit principle schematic of LED.Identical with embodiment as shown in Figure 1, alternating current dimming driving circuit comprises rectification unit 12, the first voltage sampling unit 14, first switch element 16 and the first LED light source module 18.First voltage sampling unit 14, first switch element 16 and the first LED light source module 18 form first order LED direct current dimming driving circuit.Further, the alternating current dimming driving circuit of the present embodiment also comprises the second voltage sampling unit 20, second switch unit 22, the third level LED direct current dimming driving circuit of the second level LED direct current dimming driving circuit that the second LED light source module 24 forms and tertiary voltage sampling unit the 26, three switch element 28 and the 3rd LED light source module 30 composition.In the present embodiment, second voltage sampling unit 20, second switch unit 22, second LED light source module 24 respectively with the first voltage sampling unit 14, first switch element 16 and the first LED light source module 18 identical, tertiary voltage sampling unit the 26, three switch element 28 and the 3rd LED light source module 30 respectively with the first voltage sampling unit 14, first switch element 16 and the first LED light source module 18 identical.
Fig. 4 shows the exemplary circuit figure of the alternating current dimming driving circuit for LED embodiment illustrated in fig. 3.In Fig. 4, the first end of the second voltage sampling unit 20 and the input of the second LED light source module 24 are connected to the output of the first LED light source module 18 jointly.Second end ground connection of the second voltage sampling unit 20, point pressure side of the second voltage sampling unit 20 is connected to the second input of second switch unit 22.The first input end of second switch unit 22 is connected to the output of the second LED light source module 24, the output head grounding of second switch unit 22.Similar with first order LED DC drive circuit, second switch unit 22 receives the second cut-in voltage and dividing potential drop termination through the second voltage sampling unit 20 receives the second shutoff voltage through the second LED light source module 24.When first cut-in voltage reaches the first turn on voltage threshold, first switch element is connected, then the first LED light source module is luminous, the input of second and third level LED DC drive circuit after short circuit simultaneously and output, and therefore the second LED light source module can not be luminous.First opens the light after unit short circuit, and the second cut-in voltage raises gradually.When the second cut-in voltage rising reaches the second turn on voltage threshold of second switch unit 22, second switch unit 22 is connected and the second LED light source module 24 continuous illumination together with the first LED light source module.When the second received shutoff voltage is elevated to the second shutoff voltage threshold value of second switch unit 22, second switch unit 22 turns off, and makes the second LED light source module 24 stop luminescence.
Equally, according to the identical connected mode of second level LED direct current dimming driving circuit with first order LED direct current dimming driving circuit, third level LED direct current dimming driving circuit is connected on the LED direct current dimming driving circuit of the second level.Particularly, the first end of tertiary voltage sampling unit 26 and the input of the 3rd LED light source module 28 are connected to the output of the second LED light source module 24 jointly.Second end ground connection of tertiary voltage sampling unit 26, point pressure side of tertiary voltage sampling unit 26 is connected to the second input of the 3rd switch element 30.The first input end of the 3rd switch element 30 is connected to the output of the 3rd LED light source module 28, the output head grounding of the 3rd switch element 30.Similar with first order LED DC drive circuit, the 3rd switch element 30 through the 3rd LED light source module 28 receive the 3rd cut-in voltage and through tertiary voltage sampling unit 26 dividing potential drop termination receive the 3rd shutoff voltage.When one of first and second switch elements are switched on, third level LED DC drive circuit is shorted, and therefore the 3rd LED light source module is not luminous.Have no progeny when the first and second switch elements all close, the 3rd cut-in voltage raises gradually.When the 3rd cut-in voltage rising reaches the 3rd turn on voltage threshold of the 3rd switch element 30, the 3rd switch element 30 is connected and the first to three LED light source module 28 continuous illumination.When the 3rd received shutoff voltage is elevated to the 3rd shutoff voltage threshold value of the 3rd switch element 30, the 3rd switch element 30 turns off, and makes all LED light source modules 28 stop luminescence, reaches the object of protection LED module group unit.
In the LED DC drive circuit of the second level, the second voltage sampling unit is made up of two resistance, and second switch unit is made up of two MOSFET, 3 resistance and two voltage stabilizing didoes.Equally, in third level LED DC drive circuit, tertiary voltage sampling unit is made up of two resistance, and the 3rd switch element is made up of two MOSFET, 3 resistance and two voltage stabilizing didoes.Second and third level LED DC drive circuit concrete structure in element annexation as the element annexation in first order LED DC drive circuit, do not repeat them here.
In the present embodiment, alternating current dimming driving circuit can regulate the brightness of the first to the 3rd LED light source module, colour temperature or color.Particularly, by arranging the inner parameter of the first to tertiary voltage sampling unit respectively, the resistance of two divider resistances in each voltage sampling unit is such as set, make the turn-off time of every one-level switch element different, thus control the ON time of the LED light source module of each colour temperature or color, regulate colour temperature or the color change of whole lighting device.
Alternatively, alternating current dimming driving circuit can also comprise input protection unit 10, to protect whole circuit.
In the above embodiments, the alternating current dimming driving circuit for LED comprises one-level LED direct current dimming driving circuit or three grades of LED direct current dimming driving circuits.The principle of application above-described embodiment, it will be appreciated by those skilled in the art that the present invention can be applied to the situation of the LED direct current dimming driving circuit of more than secondary LED or 3 grade.
In the situation except comprising N level LED direct current dimming driving circuit (N be greater than 1 natural number), the annexation of first order LED direct current dimming driving circuit as previously mentioned, i-th grade with the connection of the i-th-1 grade annexation as the aforesaid second level and first order LED direct current dimming driving circuit.Wherein, i is integer, and i=2,3,4 ..., N.I-th grade of LED DC drive circuit comprises the i-th voltage sampling unit, the i-th LED light source module and the i-th switch element.The concrete structure of i-th grade of LED DC drive circuit is identical with the structure of the LED direct current dimming driving circuit in aforesaid embodiment.I-th switch element receives the i-th cut-in voltage and dividing potential drop termination through the i-th voltage sampling unit receives the i-th shutoff voltage through I LED light source module.When the i-th cut-in voltage rising reaches the i-th turn on voltage threshold of the i-th switch element, the i-th switch element is connected and front i LED light source module continuous illumination simultaneously.Now, after the i-th switch element connection, it is by the next stage i.e. input and output terminal shortcircuit of the i-th+1 grade LED DC drive circuit, and therefore the i-th+1LED light source module is not luminous.When the i-th received shutoff voltage is elevated to the i-th shutoff voltage threshold value of the i-th switch element, the i-th switch element turns off.If i<N, i-th switch element closes has no progeny, then the i-th+1 cut-in voltage of the i-th+1 switch element in the i-th+1 grade LED DC drive circuit will raise, when reaching the i-th+1 turn on voltage threshold gradually, i-th+1 switch element is connected, then before, i+1 unit starts luminous together.If i=N, the i-th switch element closes has no progeny, then all LED light source module stops luminous.
Similarly, by arranging the inner parameter of the i-th voltage sampling unit respectively, the resistance of two divider resistances in each voltage sampling unit is such as set, make the turn-off time of every one-level switch element different, thus control the ON time of the LED light source module of each colour temperature or color, regulate colour temperature or the color change of the i-th LED light source module in whole lighting device.
Can find out, in the above embodiment of the present invention, voltage sampling unit can monitoring input voltage, also has the defencive function to LED light source module simultaneously.When large fluctuation appears in alternating voltage time, the switch element in every one-level can disconnect in time, protects the LED light source module in this grade not damage because electric current is excessive.
In addition, the alternating current dimming driving circuit for LED of the present invention can also comprise controllable silicon dimmer (not shown).In this case, the input of input protection unit is connected to alternating current through controllable silicon dimmer.Controllable silicon dimmer is by the alternating voltage cut of input, and the voltage waveform being therefore input to rectification unit is not complete sinusoidal waveform.Because the voltage sampling unit in every one-level LED DC drive circuit sets the shutoff voltage point of every one-level switch element, make the light source module of different-colour or color luminous alone or in combination, thus realize the colour temperature of LED light source module or the adjustment of color.In the present invention, can directly by the whole circuit loop of controllable silicon dimmer series connection access, do not need to lay separately the adjustment that control loop just can realize brightness, colour temperature or color.
In the present invention, use the dimming driving circuit of alternating current direct driving LED module, compatible traditional controllable silicon dimmer, need not independent wiring in addition, realize the adjustment of brightness, colour temperature or color.Circuit of the present invention is simple, and volume is little, lightweight, and cost is low.The use of input protection unit, improves reliability and the fail safe of device, enhances the ability of anti-electromagnetic disturbance, reduce the electromagnetic interference to electrical network.By giving the voltage sample resistor network of the conducting of control switch unit or shutoff a preset suitable shutoff voltage, realize alternating current direct driving LED light source module, and LED light source module can not glimmer when AC voltage fluctuations.Further, when the instantaneous voltage of alternating electromotive force is too high, switch element turns off, and LED light source module is not luminous, improves the utilization ratio of power supply, reduces power consumption.Meanwhile, the situation also avoiding LED light source module to burn because electric current is excessive, extends the useful life of device.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (6)
1. a LED dimming driving circuit, it comprises rectification unit and N level LED DC drive circuit, it is characterized in that, i-th grade of LED DC drive circuit is by the i-th voltage sampling unit, i-th switch element and the i-th LED light source module composition, N is natural number, i=1,2,3 ..., N;
The first end of the i-th voltage sampling unit and the input of the i-th LED light source module are connected to the first output of rectification unit jointly when i is 1, be jointly connected to the output of the i-th-1 LED light source module when i is not 1; Second end ground connection of the i-th voltage sampling unit, point pressure side of the i-th voltage sampling unit is connected to the second input of the i-th switch element;
The first input end of the i-th switch element is connected to the output of the i-th LED light source module, the output of the i-th switch element and the second output head grounding of rectification unit;
Each switch element comprises the 3rd to the 5th resistance, the first and second voltage stabilizing didoes and the first and second field effect transistor, wherein
One end of 3rd resistance is connected to described point pressure side;
The negative terminal of the first voltage stabilizing didoe and described point of press bond, positive ending grounding;
The grid of the first field effect transistor is connected to the other end of the 3rd resistance, source ground;
One end of the drain electrode of the first field effect transistor, one end of the 4th resistance, the 5th resistance, the negative terminal of the second voltage stabilizing didoe connect;
The other end of the 5th resistance is connected with the grid of the second field effect transistor; The negative terminal of the drain electrode of the second field effect transistor, the other end of the 4th resistance, the first LED light source module connects;
The anode of the second voltage stabilizing didoe and the source ground of the second field effect transistor.
2. LED dimming driving circuit as claimed in claim 1, is characterized in that, the i-th switch element receives the i-th cut-in voltage and dividing potential drop termination through the i-th voltage sampling unit receives the i-th shutoff voltage through the i-th LED light source module;
When the i-th cut-in voltage raise reach the i-th turn on voltage threshold of the i-th switch element time, the i-th switch element is connected and the 1 to the i-th LED light source module continuous illumination, makes i-th+1 to the input and output terminal shortcircuit of N level LED DC drive circuit simultaneously; When the i-th shutoff voltage received is elevated to the i-th shutoff voltage threshold value of the i-th switch element, i-th switch element turns off, and make the i-th+1 cut-in voltage of the i-th+1 switch element be elevated to the i-th+1 turn on voltage threshold when i is less than N, thus the 1 to the i-th+1 LED light source module is luminous, make the 1st to stop luminescence to N LED light source module when i equals N
Wherein, every one-level LED light source module has similar and different colour temperature and color;
The inner parameter of the voltage sampling unit in every one-level LED DC drive circuit is set, make the turn-off time difference of every one-level switch element to control corresponding LED light source module, thus make i LED light source module luminous alone or in combination, realize default colour temperature or color adjustment.
3. LED dimming driving circuit as claimed in claim 2, it is characterized in that, each voltage sampling unit comprises:
First resistance, its one end is connected to the first output of described rectification unit;
Second resistance, its one end be connected to the first resistance the other end and as point pressure side of each voltage sampling unit, the other end ground connection of the second resistance.
4. LED dimming driving circuit as claimed in claim 3, be is characterized in that, wherein, adjusted the turn-off time of the switch element in every one-level LED DC drive circuit by the resistance arranging the first and second resistance.
5. the LED dimming driving circuit as described in one of Claims 1-4, is characterized in that, comprise controllable silicon dimmer further, it is connected in series between alternating current fire wire and described rectification unit.
6. the LED dimming driving circuit as described in one of Claims 1-4, is characterized in that, comprises input protection unit and controllable silicon dimmer further, wherein
The input of described input protection unit is connected to alternating current, and output is connected to the input of rectification unit;
Described controllable silicon dimmer is connected in series between alternating current fire wire and described input protection unit.
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| CN201210424253.2A CN102892238B (en) | 2012-10-30 | 2012-10-30 | Dimming drive circuit of AC (Alternating Current) direct drive LED module |
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