CN105025635A - Light emitting diode (LED) dimming color temperature adjusting circuit - Google Patents
Light emitting diode (LED) dimming color temperature adjusting circuit Download PDFInfo
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- CN105025635A CN105025635A CN201510465773.1A CN201510465773A CN105025635A CN 105025635 A CN105025635 A CN 105025635A CN 201510465773 A CN201510465773 A CN 201510465773A CN 105025635 A CN105025635 A CN 105025635A
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Abstract
The invention discloses a Light emitting diode (LED) dimming color temperature adjusting circuit, which is used for dimming and color temperature adjusting of an LED lamp string comprising at least one warm light lamp string and at least one cold light lamp string. The LED dimming color temperature adjusting circuit comprises a master controller, a pulse-width modulation (PWM) control unit and a color temperature adjusting unit. The master controller is used for generating a path of dimming PWM signal and a path of color temperature adjusting PWM signal. The PWM control unit is connected with the master controller. The color temperature adjusting unit is connected with the master controller. The input side of the PWM control unit is connected with the input end of an alternating current (AC) through a rectification filter unit. The output side of the PWM control unit is connected with the LED lamp string through a power control unit. As the master controller controls the PWM control unit and the color temperature adjusting unit separately, and two paths of signal are independent, brightness adjustment of the LED lamp string does not cause change of the color and temperature, similarly, adjustment of the color and temperature does not cause change of brightness. When the master controller is an N-bit microprogrammed control unit (MCU), the grade of dimming color temperature adjustment can reach the grade of 2N*2N=22N, so that the brightness and color temperature of the light source can be adjusted precisely.
Description
Technical field
The present invention relates to lighting field, particularly a kind of LED light modulation color-temperature regulating circuit.
Background technology
In field of LED illumination, light modulation color-temperature regulating is the focus that people pay close attention to always.Namely so-called light modulation regulates the brightness of light source; So-called color-temperature regulating, generically thinks the color adjusting light source, and colour temperature is the temperature of color and the black matrix radiant light form and aspect black matrix simultaneously at a certain temperature of source emissioning light, and in black body radiation, along with temperature difference, the color of light is different.Colour temperature often gives the different impression of people from the different of brightness, and such as, under high color temperature light source irradiates, brightness is not high, has a kind of sombre atmosphere to people; Under low color temperature light sources irradiates, the too high meeting of brightness has a kind of sultry sensation to people.As can be seen here, the brightness of fine adjustment light source and colour temperature, be conducive to improving the LED illumination competitiveness of product in market.
At present, for LED light modulation aspect, two kinds of main solutions are the electric current (simulation light modulation) or in high frequency of linear regulation LED, allow drive current from 0 to target current value switch (digital dimming) back and forth.Utilize pulse width modulation (PWM) set circulation and the work period be the simplest method realizing digital dimming.The principle of PWM light modulation is: external pwm signal changes the duty ratio of constant-current source output to regulate the size of LED drive current effective value, thus realizes light modulation.
Existing light modulation color-temperature regulating scheme: first driving power produces a constant-current source, two-way independently pwm signal is produced at a light modulation color-temperature regulating circuit output end controller, wherein a road pwm signal controls a road and warms up light modulation string (about warm light modulation string 3000k colour temperature), another road pwm signal controls a road cold light lamp string (positive white light, about 7000k colour temperature), adjust the duty ratio of every road PWM respectively to change the size of current effective value thus to change the brightness ratio warming up light modulation string and cold light lamp string, mirror designs thus, can realize whole LED light modulation color-temperature regulating simultaneously.
The major defect of existing scheme is: suppose to adopt general N position MUC to produce two-way PWM, the combination of Ze Mei road light modulation color-temperature regulating mostly is 2 most
nlevel, two-way combination of light sources gets up to be up to 2
n+ 2
n=2
n+1level, this compound mode regulates rank deficient many.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of LED light modulation color-temperature regulating circuit that can realize many grades light modulation color-temperature regulating effect.
For solving the problems of the technologies described above, the present invention adopts following technical scheme.
A kind of LED light modulation color-temperature regulating circuit, for carrying out light modulation color-temperature regulating to the LED string including at least one warm light modulation string and at least one cold light lamp string, described LED light modulation color-temperature regulating circuit comprises one for generation of the master controller of a road light modulation pwm signal and a road color-temperature regulating pwm signal, a PWM control unit be connected with described main controller and a color-temperature regulating unit be connected with described main controller, the input side of described PWM control unit is connected with AC input by a rectification filtering unit, outlet side is contacted with LED by a power control unit and is connect, wherein
Described PWM control unit receives the light modulation pwm signal coming from described master controller, carries out level conversion to it, then export the first pwm control signal that controls this power control unit break-make, thus adjustment inputs to the electric current of LED string;
Described color-temperature regulating unit includes contrary first switching circuit and accessed in warm light modulation string of conduction level and accesses second switch circuit in cold light lamp string, the color-temperature regulating pwm signal coming from described master controller exports described first switching circuit and second switch circuit to respectively to adjust the brightness ratio of warm light modulation string and cold light lamp string, thus the colour temperature realizing LED string regulates.
Further, an isolated location is had access between described master controller and color-temperature regulating unit or between described master controller and PWM control unit.
Further, the isolating device of described isolated location is photoelectrical coupler or coupling transformer.
Further, described power control unit comprises transformer and is connected to the power switch pipe of described transformer primary, described power switch pipe is connected with described master controller output, described transformer secondary connects through contacting with described LED, the first pwm control signal that this master controller exports is made the transformer coupled voltage to primary side be adjusted by the conducting of Modulating Power switching tube, cut-off, thus be have adjusted the electric current inputing to LED string.
Further, described first switching circuit comprises the first switching tube, and described second switch circuit comprises the second switch pipe contrary with the first switching tube conduction level.
Further, described first switching circuit comprises the first switching tube, and described second switch circuit comprises the second switch pipe identical with the first switching tube conduction level and is connected with this second switch pipe can by the 3rd anti-phase for second switch pipe phase of output signal switching tube.
Further, described LED light modulation color-temperature regulating circuit also includes one for receiving the receiving element of the light modulation color-temperature regulating desired signal of outside input, and described master controller generates described light modulation pwm signal and color-temperature regulating pwm signal according to received light modulation color-temperature regulating desired signal.
Further, described power control unit is provided with absorbing circuit, for absorbing the leakage field of transformer, reduces the stress of power switch pipe, to protect power switch pipe.
Further, described first switching circuit comprises a N-type metal-oxide-semiconductor, and the grid of this N-type metal-oxide-semiconductor is connected with described color-temperature regulating pwm signal end by one first resistance, and the drain electrode of this N-type metal-oxide-semiconductor and warm light modulation are contacted and connect, and its source electrode is connected to ground; Described second switch circuit comprises a P type metal-oxide-semiconductor, and the grid of this P type metal-oxide-semiconductor is connected with described color-temperature regulating pwm signal end by one second resistance, and the drain electrode of this P type metal-oxide-semiconductor and cold light lamp are contacted and connect, and its source electrode is connected to ground.
Further, described first switching circuit comprises the first N-type metal-oxide-semiconductor, and the grid of this first N-type metal-oxide-semiconductor is connected with described color-temperature regulating pwm signal end by one first resistance, and the drain electrode of this first N-type metal-oxide-semiconductor and warm light modulation are contacted and connect, and its source electrode is connected to ground; Described second switch circuit comprises the second N-type metal-oxide-semiconductor, the 3rd N-type metal-oxide-semiconductor, the grid of this second N-type metal-oxide-semiconductor described is connected with described color-temperature regulating pwm signal end by one second resistance, the source electrode of this second N-type metal-oxide-semiconductor is connected to ground, its drain electrode is connected with power supply respectively by one the 3rd resistance, is connected with the grid of the 3rd N-type metal-oxide-semiconductor by one the 4th resistance, the drain electrode of the 3rd N-type metal-oxide-semiconductor and cold light lamp are contacted and are connect, and its source electrode is connected to ground.
Further, described first switching circuit comprises a NPN type triode, and the base stage of this NPN type triode is connected to color-temperature regulating pwm signal end by one first resistance, and the collector electrode of this NPN type triode and warm light modulation are contacted and connect, its grounded emitter; Described second switch circuit comprises a PNP type triode, and the base stage of this PNP type triode is connected with color-temperature regulating pwm signal end by one second resistance, and the emitter of this PNP type triode and cold light lamp are contacted and connect, its grounded collector.
Further, described first switching circuit comprises the first NPN type triode, and the base stage of this first NPN type triode is connected with color-temperature regulating pwm signal end by one first resistance, and the collector electrode of this first NPN type triode and warm light modulation are contacted and connect, its grounded emitter; Described second switch circuit comprises the second NPN type triode, the 3rd NPN type triode, the base stage of this second NPN type triode is connected with color-temperature regulating pwm signal end by one second resistance, the emitter of this second NPN type triode is connected to ground, its collector electrode is connected with power supply respectively by one the 3rd resistance, be connected with the base stage of the 3rd NPN type triode by one the 4th resistance, the collector electrode of the 3rd NPN type triode and cold light lamp are contacted and are connect, its grounded emitter.
The present invention's beneficial effect is compared with prior art: this master controller produces a road light modulation pwm signal and a road color-temperature regulating pwm signal, two paths of signals controls described PWM control unit and color-temperature regulating unit respectively, because two paths of signals is separate, therefore the adjustment of LED cross luma degree can not cause the change of its colour temperature, in like manner, the adjustment of its colour temperature also can not cause the change of brightness.When described master controller is N position MCU, light modulation color-temperature regulating grade of the present invention can reach 2
n× 2
n=2
2Nlevel, can the brightness of fine adjustment light source and colour temperature.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present invention.
Fig. 2 is the circuit connecting relation schematic diagram of power control unit.
Fig. 3 is the present invention's circuit block diagram in certain embodiments.
Fig. 4 is the circuit connecting relation schematic diagram that the partial circuit block diagram of Fig. 3 is corresponding.
Fig. 5 is the circuit connecting relation schematic diagram that the partial circuit block diagram of Fig. 3 is corresponding.
Fig. 6 is the circuit connecting relation schematic diagram that the partial circuit block diagram of Fig. 3 is corresponding.
Fig. 7 is the circuit connecting relation schematic diagram that the partial circuit block diagram of Fig. 3 is corresponding.
Fig. 8 is the present invention's circuit block diagram in further embodiments.
Fig. 9 is the circuit connecting relation schematic diagram that the partial circuit block diagram of Fig. 8 is corresponding.
Figure 10 is the circuit connecting relation schematic diagram that the partial circuit block diagram of Fig. 8 is corresponding.
Figure 11 is the circuit connecting relation schematic diagram that the partial circuit block diagram of Fig. 8 is corresponding.
Figure 12 is the circuit connecting relation schematic diagram that the partial circuit block diagram of Fig. 8 is corresponding
Embodiment
In order to more fully understand technology contents of the present invention, below in conjunction with specific embodiment, technical scheme of the present invention being described further and being illustrated.
Consult shown in Fig. 1, in some embodiments of the invention, this LED light modulation color-temperature regulating circuit includes a master controller 10, one PWM control unit 20 and a color-temperature regulating unit 30, wherein, this master controller 10 is for generation of an a road light modulation pwm signal PWM1 and road color-temperature regulating pwm signal PMW2, the input side of this PWM control unit 20 is connected with AC input by a rectification filtering unit 50, outlet side is then connected with LED string 40 by a power control unit 60, the reception of this PWM control unit 20 comes from the light modulation pwm signal of this master controller 10 and completes level conversion, then export the first pwm control signal that controls this power control unit 60 break-make, thus adjustment exports the size of current of LED string 40 to, to realize the light modulation of LED.This color-temperature regulating unit 30 is connected with this master controller 10, include contrary first switching circuit and accessed in warm light modulation string of conduction level and access second switch circuit in cold light lamp string, the color-temperature regulating pwm signal PMW2 coming from master controller 10 exports the first switching circuit and second switch circuit to respectively to adjust the brightness ratio of warm light modulation string and cold light lamp string, thus the colour temperature realizing LED string 40 regulates.
Wherein, master controller 10 is N position MCU, can be the MCU of 1,4,8,16,32,64.Be described for 8 MCU in this patent specification.The duty ratio of the duty ratio of the first pwm control signal and the input signal of PWM control unit 20 can for the proportional relation of following, or the inverse relation of following.Such as, when light modulation pwm signal PMW1 duty ratio is 40%, the duty ratio of the first pwm control signal is also 40%; Or when light modulation pwm signal PMW1 duty ratio is 40%, the duty ratio of the first pwm control signal is 60%.
This master controller 10 produces a road light modulation pwm signal and a road color-temperature regulating pwm signal, two paths of signals controls described PWM control unit 20 and color-temperature regulating unit 30 respectively, because two paths of signals is separate, therefore the adjustment of LED string 40 brightness can not cause the change of its colour temperature, in like manner, the adjustment of its colour temperature also can not cause the change of brightness.When described master controller 10 is 8 MCU, light modulation color-temperature regulating grade of the present invention can reach 2
8× 2
8=65536 grades, can the brightness of fine adjustment light source and colour temperature.
In certain embodiments, as shown in Figure 3, an isolated location 70 is had access between master controller 10 and color-temperature regulating unit 30, the color-temperature regulating pwm signal PWM2 that master controller 10 exports is coupled to described color-temperature regulating unit 30 through this isolated location 70, and the light modulation pwm signal PWM1 of master controller 10 is directly inputted to described PWM control unit 20.The main device of isolated location 70 is photoelectrical coupler or coupling transformer, and during signal one-way transmission, achieve light modulation, the two-part electrical isolation of color-temperature regulating, antijamming capability is strong.
Composition graphs 4, in the embodiment shown in fig. 4, the isolating device of this isolated location 70 is photoelectrical coupler IC2,1 pin of photoelectrical coupler IC2 is connected with the color-temperature regulating pwm signal end that master controller 10 exports by resistance R2,2 pin connect signal ground, 3 pin connect power supply ground, and 4 pin are connected with power supply by resistance R3 on the one hand, are directly connected with color-temperature regulating unit 30 on the one hand.The color-temperature regulating pwm signal PWM2 that master controller 10 exports is input to photoelectrical coupler IC2 through resistance R2, becomes the PWM2A signal contrary with color-temperature regulating pwm signal PWM2 phase place, and PWM2A signal is input to color-temperature regulating unit 30 through opto-electronic conversion.
Fig. 2 shows a kind of embodiment of power control unit, in this embodiment, this power control unit 60 comprises transformer T1 and is positioned at the power MOS pipe Q3 of transformer T1 primary side, the grid of power MOS pipe Q3 is connected with the GD pin of master controller 10, transformer T1 primary side is connected with LED string 40 through current rectifying and wave filtering circuit, the first pwm control signal that this master controller 10 exports by the conducting of Modulating Power metal-oxide-semiconductor Q3, end the voltage making transformer T1 be coupled to primary side and be changed, thus have adjusted the size of current inputing to LED string 40.In figure, resistance R6, electric capacity C1, diode D1 form absorbing circuit, for absorbing the leakage field of transformer T1, reduce the stress of power MOS pipe Q3, to protect power MOS pipe Q3.Diode D2, electric capacity C2 are used for realizing rectifying and wave-filtering.It will be appreciated by those skilled in the art that ground, this power control unit can also be other conventional circuit structure.
Fig. 4 also show a kind of color-temperature regulating unit 30 structure, it comprises the first switching circuit and second switch circuit, this first switching circuit includes a N-type metal-oxide-semiconductor Q1, the grid of this N-type metal-oxide-semiconductor Q1 is connected to color-temperature regulating pwm signal end by the first resistance R4, the drain electrode of this N-type metal-oxide-semiconductor Q1 is connected with warm light modulation string LED1, its source ground; Second switch circuit comprises a P type metal-oxide-semiconductor Q2, and the grid of this P type metal-oxide-semiconductor Q2 is connected with color-temperature regulating pwm signal end by the second resistance R5, and the drain electrode of P type metal-oxide-semiconductor Q2 is connected with cold light lamp string LED2, its source ground.
Fig. 5 also show another kind of color-temperature regulating unit 30 structure, it comprises the first switching circuit and second switch circuit, this first switching circuit comprises the first N-type metal-oxide-semiconductor Q1, the grid of this N-type metal-oxide-semiconductor Q1 is connected to color-temperature regulating pwm signal end by the first resistance R4, the drain electrode of this first N-type metal-oxide-semiconductor Q1 is connected with warm light modulation string LED1, and its source electrode is connected to ground; Second switch circuit comprises the second N-type metal-oxide-semiconductor Q2, the 3rd resistance R6, the 3rd N-type metal-oxide-semiconductor Q4, the grid of this second N-type metal-oxide-semiconductor Q2 is connected with color-temperature regulating pwm signal end by the second resistance R5, the source electrode of this second N-type metal-oxide-semiconductor Q2 is connected to ground, its drain electrode is connected with power supply respectively by the 3rd resistance R6, is connected with the grid of the 3rd N-type metal-oxide-semiconductor Q4 by the 4th resistance R7, the drain electrode of the 3rd N-type metal-oxide-semiconductor Q4 is connected with cold light lamp string LED2, and its source electrode is connected to ground.
It will be appreciated by those skilled in the art that ground, also the metal-oxide-semiconductor playing on-off action in the first switching circuit and second switch circuit can be changed into switch triode and regulate to realize colour temperature.
As Fig. 6 shows a kind of color-temperature regulating unit 30 structure, it comprises the first switching circuit and second switch circuit, this first switching circuit comprises a NPN type triode Q1, the base stage of this NPN type triode Q1 is connected to color-temperature regulating pwm signal end by the first resistance R4, the collector electrode of this NPN type triode Q1 is connected with warm light modulation string LED1, its grounded emitter; Second switch circuit comprises a PNP type triode Q2, and the base stage of this PNP type triode Q2 is connected with color-temperature regulating pwm signal end by the second resistance R5, and the emitter of this PNP type triode Q2 is connected with cold light lamp string LED2, its grounded collector.
Fig. 7 also show another kind of color-temperature regulating unit 30 structure, it comprises the first switching circuit and second switch circuit, this first switching circuit comprises the first NPN type triode Q1, the base stage of this NPN type triode Q1 is connected to color-temperature regulating pwm signal end by the first resistance R4, the collector electrode of this NPN type triode Q1 is connected with warm light modulation string LED1, its grounded emitter; Second switch circuit comprises the second NPN type triode Q2, the 3rd NPN type triode Q4, the base stage of this second NPN type triode Q2 is connected with color-temperature regulating pwm signal end by the second resistance R5, the emitter of this second NPN type triode Q2 is connected to ground, its collector electrode is connected with power supply respectively by the 3rd resistance R6, be connected with the base stage of the 3rd NPN type triode Q4 by the 4th resistance R7, the collector electrode of the 3rd NPN type triode Q4 and cold light lamp are contacted and are connect, its grounded emitter.
It will be appreciated by those skilled in the art that ground, color-temperature regulating unit 30 structure can also use remaining circuit, as long as can meet the first switching circuit and second switch circuit turn-on situation is anti-phase, just can realize the adjustment of colour temperature.
So that operation principle of the present invention to be described shown in composition graphs 4.When MCU works, dim signal PWM1 is added to the DIM pin of PWM control unit 20 master chip IC1 through resistance R1, DIM pin is delivered to master chip IC1 inside and is completed level conversion after receiving PWM1 signal, then export the size of current that the first pwm control signal controls the conducting of power switch pipe Q3 in power control unit 60, cut-off thus adjustment export LED string 40 to, to realize the light modulation of LED by GD pin.Such as, when the duty cycle square wave of PWM1 slowly becomes large and is input to the DIM pin of master chip IC1, master chip IC1 export one follow PWM1 duty ratio direct ratio change by the first pwm control signal tuned up, the conducting of power switch pipe in this first pwm control signal Modulating Power control unit 60, output current is made to become large, LED string 40 brightness increases, and vice versa.During due to adjustment brightness, PWM2 is change no, so colour temperature can remaining unchanged.
The PWM2 that MCU produces is added to the input of photoelectrical coupler IC2 after resistance R2, through opto-electronic conversion, in PWM2A signal and the PWM2 signal inversion of output generation.PWM2A controls the duty ratio of N-type metal-oxide-semiconductor Q1 after R4, to regulate the duty ratio of warm light modulation string LED1, PWM2A control P type metal-oxide-semiconductor Q2 after R5, to regulate cold light lamp string LED2.Due to Q1 be N-type metal-oxide-semiconductor, Q2 is P type metal-oxide-semiconductor, Q1 conducting when PWM2A is high level, Q2 conducting when PWM2A is low level, Q1 and Q2 conduction level is contrary, namely when PWM2 duty ratio reduces, PWM2A duty ratio increases, and warm light modulation string LED1 increases cold light lamp string LED2 brightness ratio; PWM2 duty ratio increases, and PWM2A duty ratio reduces, and warm light modulation string LED1 reduces cold light lamp string LED2 brightness ratio, is therefore easy to reach the object regulating colour temperature.
Circuit shown in Fig. 5 is substantially identical with circuit working principle shown in Fig. 4, and difference is color-temperature regulating unit 30, now this part operation principle is only described.The PWM2 that MCU produces is added to the input of photoelectrical coupler IC2 after resistance R2, through opto-electronic conversion, in PWM2A signal and the PWM2 signal inversion of output generation.PWM2A controls the duty ratio of the first N-type metal-oxide-semiconductor Q1 after R4, to regulate warm light modulation string LED1, PWM2A to control the second N-type metal-oxide-semiconductor Q2 after R5, and after control the duty ratio of the 3rd N-type metal-oxide-semiconductor Q4 through resistance R7.When PWM2A is high level, the first N-type metal-oxide-semiconductor Q1, the second N-type metal-oxide-semiconductor Q2 conducting, signal and the PWM2A of now the second N-type metal-oxide-semiconductor Q2 output are anti-phase, and therefore the grid of the 3rd N-type metal-oxide-semiconductor Q4 connects low level, the 3rd N-type metal-oxide-semiconductor Q4 not conducting.It can thus be appreciated that when PWM2 duty ratio reduces, PWM2A duty ratio increases, warm light modulation string LED1 increases cold light lamp string LED2 brightness ratio; PWM2 duty ratio increases, and PWM2A duty ratio reduces, and warm light modulation string LED1 reduces cold light lamp string LED2 brightness ratio, is therefore easy to reach the object regulating colour temperature.
It will be appreciated by those skilled in the art that ground, similar respectively with Fig. 4, Fig. 5 of the operation principle of the present invention shown in Fig. 6, Fig. 7, repeats no more.
In further embodiments, as shown in Figure 8, an isolated location 70 is had access between master controller 10 and PWM control unit 20, the light modulation pwm signal PWM1 that master controller 10 produces is coupled to PWM control unit 20 through isolated location 70, and the color-temperature regulating pwm signal PWM2 of master controller 10 is directly inputted to color-temperature regulating unit 30.The main device of isolated location 70 is photoelectrical coupler or coupling transformer, and during signal one-way transmission, achieve light modulation, the two-part electrical isolation of color-temperature regulating, antijamming capability is strong.
Composition graphs 9, in the embodiment shown in fig. 9, the isolating device of this isolated location 70 is photoelectrical coupler IC2,1 pin of photoelectrical coupler IC2 is held with the light modulation pwm signal PWM1 that master controller 10 exports by resistance R2 and is connected, 2 pin connect power supply ground, 3 pin connect signal ground, and 4 pin are connected with power supply by resistance R1 on the one hand, are directly connected with PWM control unit 20 on the one hand.The light modulation pwm signal PWM1 that master controller 10 exports is input to photoelectrical coupler IC2 through resistance R2, becomes the PWM1A signal contrary with light modulation pwm signal PWM1 phase place, to adjust PWM control unit 20 through opto-electronic conversion.
Fig. 2 shows a kind of embodiment of power control unit, in this embodiment, this power control unit 60 comprises transformer T1 and is positioned at the power MOS pipe Q3 of transformer T1 primary side, the grid of power MOS pipe Q3 is connected with the GD pin of master controller 10, transformer T1 primary side is connected with LED string 40 through current rectifying and wave filtering circuit, the first pwm control signal that this master controller 10 exports by the conducting of Modulating Power metal-oxide-semiconductor Q3, end the voltage making transformer T1 be coupled to primary side and be changed, thus have adjusted the size of current inputing to LED string 40.In figure, resistance R6, electric capacity C1, diode D1 form absorbing circuit, for absorbing the leakage field of transformer T1, reduce the stress of power MOS pipe Q3, to protect power MOS pipe Q3.Diode D2, electric capacity C2 are used for realizing rectifying and wave-filtering.It will be appreciated by those skilled in the art that ground, this power control unit can also be other conventional circuit structure.
Fig. 9 shows a kind of color-temperature regulating unit 30 structure, it comprises the first switching circuit and second switch circuit, this first switching circuit includes a N-type metal-oxide-semiconductor Q1, the grid of this N-type metal-oxide-semiconductor Q1 is connected to color-temperature regulating pwm signal end by the first resistance R4, the drain electrode of this N-type metal-oxide-semiconductor Q1 is connected with warm light modulation string LED1, its source ground; Second switch circuit comprises a P type metal-oxide-semiconductor Q2, and the grid of this P type metal-oxide-semiconductor Q2 is connected with color-temperature regulating pwm signal end by the second resistance R5, and the drain electrode of P type metal-oxide-semiconductor Q2 is connected with cold light lamp string LED2, its source ground.
Figure 10 also show another kind of color-temperature regulating unit 30 structure, this first switching circuit comprises the first N-type metal-oxide-semiconductor Q1, the grid of this N-type metal-oxide-semiconductor Q1 is connected to color-temperature regulating pwm signal end by the first resistance R4, the drain electrode of this first N-type metal-oxide-semiconductor Q1 is connected with warm light modulation string LED1, and its source electrode is connected to ground; Second switch circuit comprises the second N-type metal-oxide-semiconductor Q2, the 3rd resistance R6, the 3rd N-type metal-oxide-semiconductor Q4, the grid of this second N-type metal-oxide-semiconductor Q2 is connected with color-temperature regulating pwm signal end by the second resistance R5, the source electrode of this second N-type metal-oxide-semiconductor Q2 is connected to ground, its drain electrode is connected with power supply respectively by the 3rd resistance R6, is connected with the grid of the 3rd N-type metal-oxide-semiconductor Q4 by the 4th resistance R7, the drain electrode of the 3rd N-type metal-oxide-semiconductor Q4 is connected with cold light lamp string LED2, and its source electrode is connected to ground.It will be appreciated by those skilled in the art that ground, also the metal-oxide-semiconductor playing on-off action in the first switching circuit and second switch circuit can be changed into switch triode and regulate to realize colour temperature.
As Figure 11 shows a kind of color-temperature regulating unit 30 structure, it comprises the first switching circuit and second switch circuit, this first switching circuit comprises a NPN type triode Q1, the base stage of this NPN type triode Q1 is connected to color-temperature regulating pwm signal end by the first resistance R4, the collector electrode of this NPN type triode Q1 is connected with warm light modulation string LED1, its grounded emitter; Second switch circuit comprises a PNP type triode Q2, and the base stage of this PNP type triode Q2 is connected with color-temperature regulating pwm signal end by the second resistance R5, and the emitter of this PNP type triode Q2 is connected with cold light lamp string LED2, its grounded collector.
Figure 12 also show another kind of color-temperature regulating unit 30 structure, it comprises the first switching circuit and second switch circuit, this first switching circuit comprises the first NPN type triode Q1, the base stage of this NPN type triode Q1 is connected to color-temperature regulating pwm signal end by the first resistance R4, the collector electrode of this NPN type triode Q1 is connected with warm light modulation string LED1, its grounded emitter; Second switch circuit comprises the second NPN type triode Q2, the 3rd NPN type triode Q4, the base stage of this second NPN type triode Q2 is connected with color-temperature regulating pwm signal end by the second resistance R5, the emitter of this second NPN type triode Q2 is connected to ground, its collector electrode is connected with power supply respectively by the 3rd resistance R6, be connected with the base stage of the 3rd NPN type triode Q4 by the 4th resistance R7, the collector electrode of the 3rd NPN type triode Q4 and cold light lamp are contacted and are connect, its grounded emitter.
It will be appreciated by those skilled in the art that ground, color-temperature regulating unit 30 structure can also use remaining circuit, as long as can meet the first switching circuit and second switch circuit turn-on situation is anti-phase, just can realize the adjustment of colour temperature.
So that operation principle of the present invention to be described shown in composition graphs 9.When MCU works, dim signal PWM1 delivers to the input of photoelectrical coupler IC2 through resistance R2, the PWM1A signal contrary with PWM1 signal phase is produced at the output of photoelectrical coupler IC2 after opto-electronic conversion, this PWM1A signal is added to the DIM pin of PWM control unit 20 master chip IC1 through resistance R1, deliver to master chip IC1 inside and complete level conversion, then export the size of current that the first pwm control signal controls the conducting of power switch pipe Q3 in power control unit 60, cut-off thus adjustment export LED string 40 to, to realize the light modulation of LED by GD pin.Such as, when the duty cycle square wave of PWM1 slowly diminishes, the duty ratio of PWM1A slowly becomes large, and be input to the DIM pin of master chip IC1, the DG pin of master chip IC1 export one follow the change of PWM1A duty ratio direct ratio by the first pwm control signal tuned up, the conducting of power switch pipe Q3 in this first pwm control signal Modulating Power control unit 60, makes output current become large, LED string 40 brightness increases, and vice versa.During due to adjustment brightness, PWM2 is change no, so colour temperature can remaining unchanged.
The PWM2 that MCU produces directly receives color-temperature regulating unit 30.PWM2 controls the duty ratio of N-type metal-oxide-semiconductor Q1 after R4, to regulate the duty ratio of warm light modulation string LED1, PWM2 control P type metal-oxide-semiconductor Q2 after R5, to regulate cold light lamp string LED2.Due to Q1 be N-type metal-oxide-semiconductor, Q2 is P type metal-oxide-semiconductor, Q1 conducting when PWM2 is high level, Q2 conducting when PWM2 is low level, Q1 and Q2 conduction level is anti-, namely increases cold light lamp string LED2 brightness ratio when PWM2 duty ratio increases warm light modulation string LED1; PWM2 duty ratio reduces, and warm light modulation string LED1 reduces cold light lamp string LED2 brightness ratio, is therefore easy to reach the object regulating colour temperature.
Circuit shown in Figure 10 is substantially identical with circuit working principle shown in Fig. 4, and difference is color-temperature regulating unit 30, now this part operation principle is only described.The PWM2 that MCU produces is added to the input of photoelectrical coupler IC2 after resistance R2, through opto-electronic conversion, in PWM2A signal and the PWM2 signal inversion of output generation.PWM2A controls the duty ratio of the first N-type metal-oxide-semiconductor Q1 after R4, to regulate warm light modulation string LED1, PWM2A to control the second N-type metal-oxide-semiconductor Q2 after R5, and after control the duty ratio of the 3rd N-type metal-oxide-semiconductor Q4 through resistance R7.When PWM2A is high level, the first N-type metal-oxide-semiconductor Q1, the second N-type metal-oxide-semiconductor Q2 conducting, signal and the PWM2A of now the second N-type metal-oxide-semiconductor Q2 output are anti-phase, and therefore the grid of the 3rd N-type metal-oxide-semiconductor Q4 connects low level, the 3rd N-type metal-oxide-semiconductor Q4 not conducting.It can thus be appreciated that when PWM2 duty ratio reduces, PWM2A duty ratio increases, warm light modulation string LED1 increases cold light lamp string LED2 brightness ratio; PWM2 duty ratio increases, and PWM2A duty ratio reduces, and warm light modulation string LED1 reduces cold light lamp string LED2 brightness ratio, is therefore easy to reach the object regulating colour temperature.
It will be appreciated by those skilled in the art that ground, similar respectively with Fig. 9, Figure 10 of the operation principle of the present invention shown in Figure 11, Figure 12, repeats no more.
In certain embodiments, LED light modulation color-temperature regulating circuit is also provided with the receiving element of the light modulation color-temperature regulating desired signal for receiving outside input, and master controller generates light modulation pwm signal and color-temperature regulating pwm signal according to received light modulation color-temperature regulating desired signal.This receiving element can be connected with external smart terminal (mobile phone, IPAD etc.), and the light modulation color-temperature regulating desired signal from communication network is supplied to master controller.This receiving element can adopt any receiver module with communication function, such as WIFI module, bluetooth module, 4G communication module, 3G communication module, 2G communication module etc.User only need carry out operating at outside intelligent terminal and just can not control this LED light modulation color-temperature regulating circuit by the restriction in region, space, the significant increase property easy to use of user.
More than state only with embodiment to further illustrate technology contents of the present invention so that reader is easier to understand, but does not represent embodiments of the present invention and be only limitted to this, any technology done according to the present invention extends or recreation, all by protection of the present invention.
Claims (10)
1. a LED light modulation color-temperature regulating circuit, for carrying out light modulation color-temperature regulating to the LED string including at least one warm light modulation string and at least one cold light lamp string, it is characterized in that: described LED light modulation color-temperature regulating circuit comprises one for generation of the master controller of a road light modulation pwm signal and a road color-temperature regulating pwm signal, the one PWM control unit be connected with described main controller and a color-temperature regulating unit be connected with described main controller, the input side of described PWM control unit is connected with AC input by a rectification filtering unit, outlet side is contacted with LED by a power control unit and is connect, wherein,
Described PWM control unit receives the light modulation pwm signal coming from described master controller, carries out level conversion to it, then export the first pwm control signal that controls this power control unit break-make, thus adjustment inputs to the electric current of LED string;
Described color-temperature regulating unit includes contrary first switching circuit and accessed in warm light modulation string of conduction level and accesses second switch circuit in cold light lamp string, the color-temperature regulating pwm signal coming from described master controller exports described first switching circuit and second switch circuit to respectively to adjust the brightness ratio of warm light modulation string and cold light lamp string, thus the colour temperature realizing LED string regulates.
2. LED light modulation color-temperature regulating circuit as claimed in claim 1, is characterized in that: have access to an isolated location between described master controller and color-temperature regulating unit or between described master controller and PWM control unit.
3. LED light modulation color-temperature regulating circuit as claimed in claim 1, it is characterized in that: described power control unit comprises transformer and is connected to the power switch pipe of described transformer primary, described power switch pipe is connected with described master controller output, described transformer secondary and described LED are contacted and are connect, the first pwm control signal that this master controller exports is made the transformer coupled voltage to primary side be changed by the conducting of Modulating Power switching tube, cut-off, thus be have adjusted the electric current inputing to LED string.
4. LED light modulation color-temperature regulating circuit as claimed in claim 1, it is characterized in that: described first switching circuit comprises the first switching tube, described second switch circuit comprises the second switch pipe contrary with the first switching tube conduction level.
5. LED light modulation color-temperature regulating circuit as claimed in claim 1, it is characterized in that: described first switching circuit comprises the first switching tube, described second switch circuit comprises the second switch pipe identical with the first switching tube conduction level and is connected with this second switch pipe can by the 3rd anti-phase for second switch pipe phase of output signal switching tube.
6. LED light modulation color-temperature regulating circuit as claimed in claim 1, it is characterized in that: described LED light modulation color-temperature regulating circuit also includes one for receiving the receiving element of the light modulation color-temperature regulating desired signal of outside input, and described master controller generates described light modulation pwm signal and color-temperature regulating pwm signal according to received light modulation color-temperature regulating desired signal.
7. LED light modulation color-temperature regulating circuit as claimed in claim 1, it is characterized in that: described first switching circuit comprises a N-type metal-oxide-semiconductor, the grid of this N-type metal-oxide-semiconductor is connected with described color-temperature regulating pwm signal end by one first resistance, the drain electrode of this N-type metal-oxide-semiconductor and warm light modulation are contacted and are connect, and its source electrode is connected to ground; Described second switch circuit comprises a P type metal-oxide-semiconductor, and the grid of this P type metal-oxide-semiconductor is connected with described color-temperature regulating pwm signal end by one second resistance, and the drain electrode of this P type metal-oxide-semiconductor and cold light lamp are contacted and connect, and its source electrode is connected to ground.
8. LED light modulation color-temperature regulating circuit as claimed in claim 1, it is characterized in that: described first switching circuit comprises the first N-type metal-oxide-semiconductor, the grid of this first N-type metal-oxide-semiconductor is connected with described color-temperature regulating pwm signal end by one first resistance, the drain electrode of this first N-type metal-oxide-semiconductor and warm light modulation are contacted and are connect, and its source electrode is connected to ground; Described second switch circuit comprises the second N-type metal-oxide-semiconductor, the 3rd N-type metal-oxide-semiconductor, the grid of this second N-type metal-oxide-semiconductor described is connected with described color-temperature regulating pwm signal end by one second resistance, the source electrode of this second N-type metal-oxide-semiconductor is connected to ground, its drain electrode is connected with power supply respectively by one the 3rd resistance, is connected with the grid of the 3rd N-type metal-oxide-semiconductor by one the 4th resistance, the drain electrode of the 3rd N-type metal-oxide-semiconductor and cold light lamp are contacted and are connect, and its source electrode is connected to ground.
9. LED light modulation color-temperature regulating circuit as claimed in claim 1, it is characterized in that: described first switching circuit includes a NPN type triode, the base stage of this NPN type triode is connected to color-temperature regulating pwm signal end by one first resistance, the collector electrode of this NPN type triode and warm light modulation are contacted and are connect, its grounded emitter; Described second switch circuit comprises a PNP type triode, and the base stage of this PNP type triode is connected with color-temperature regulating pwm signal end by one second resistance, and the emitter of this PNP type triode and cold light lamp are contacted and connect, its grounded collector.
10. LED light modulation color-temperature regulating circuit as claimed in claim 1, it is characterized in that: described first switching circuit comprises the first NPN type triode, the base stage of this first NPN type triode is connected with color-temperature regulating pwm signal end by one first resistance, the collector electrode of this first NPN type triode and warm light modulation are contacted and are connect, its grounded emitter; Described second switch circuit comprises the second NPN type triode, the 3rd NPN type triode, the base stage of this second NPN type triode is connected with color-temperature regulating pwm signal end by one second resistance, the emitter of this second NPN type triode is connected to ground, its collector electrode is connected with power supply respectively by one the 3rd resistance, be connected with the base stage of the 3rd NPN type triode by one the 4th resistance, the collector electrode of the 3rd NPN type triode and cold light lamp are contacted and are connect, its grounded emitter.
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