CN103763825A - LED constant current PWM drive circuit and three-primary-color LED light mixing driving circuit - Google Patents
LED constant current PWM drive circuit and three-primary-color LED light mixing driving circuit Download PDFInfo
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Abstract
The invention provides an LED constant current PWM drive circuit and a three-primary-color LED light mixing driving circuit. The LED constant current PWM drive circuit comprises a three-end bilateral switch circuit, a PWM waveform signal generating circuit and an LED constant current drive circuit, wherein the three-end bilateral switch circuit is connected with an alternating current power source and used for converting a sine alternating current signal provided by the alternating current power source into a sine chopped wave waveform signal; the PWM waveform signal generating circuit is connected with the three-end bilateral switch circuit and used for generating a PWM waveform signal by utilizing the sine chopped wave-shaped signal; the LED constant current drive circuit is connected with the PWM waveform signal generating circuit and used for controlling the on-off state of an LED light source by utilizing the PWM waveform signal, and the constant current PWM driving of an LED is achieved. According to the LED constant current PWM drive circuit, the direct driving load of the three-end bilateral switch circuit is a resistive load rather than a capacitive load, and therefore the technical scheme can guarantee high-power factors, and the quality of the whole power grid cannot be affected.
Description
Technical field
The present invention relates to LED technical field, relate in particular to a kind of LED constant current PWM drive circuit and three-primary color LED mixed light drive circuit.
Background technology
The advantages such as light-emitting diode (Light Emitting Diode is called for short LED) volume is little owing to having, energy-saving and environmental protection, long service life, become one of most potential substitute of conventional light source.
LED white light source produces several different methods, and a kind of is to utilize blue-ray LED to excite yellow fluorescent powder to produce white light, but the bright dipping of the white light LEDs of this kind of method manufacture exists larger randomness, and because fluorescent material is aging, the efficiency of LED will reduce.Three primary colors mixed light is a kind of good generating white light method.Three primary colors mixed light is to utilize red-light LED, blue-ray LED and green light LED to carry out mixed light, according to CIE (Commission Internationale De L'Eclairage) chromatic diagram, the colour temperature of light is relevant with the proportional quantities r of three primary colors (λ), g (λ) and b (λ), and the r that satisfies condition (λ)+g (λ)+b (λ)=1, therefore, the pulsewidth that three primary colors mixed light not only can change LED electric current realizes brightness regulation, and can change according to user's hobby the colour temperature adjusting of the ratio acquisition LED of three primary colors lumen.The conventional light regulating technology of LED has PWM light modulation and simulation light modulation at present, and the former light modulation principle is to control the ON time of the LED electric current of flowing through, and the latter's light modulation principle is directly to control the size of the LED electric current of flowing through.
Three terminal bidirectional switch (TRIAC, bidirectional thyristor) is the conventional rectifying device of field of power electronics, and the control signal by gate pole can realize its conducting on both direction.After TRIAC conducting, gate pole control signal is effect out of hand just, and when the electric current by TRIAC is lower than maintaining electric current, TRIAC becomes cut-off from conducting.Dimmer based on TRIAC is widely used at present in the dimmer application of the pure resistive loads such as incandescent lamp and Halogen lamp LED, its basic principle is by controlling the triggering of TRIAC, constantly to control the ON time of TRIAC, and then realize the adjusting to light source (load) voltage, thereby reach the object of light modulation.
For the LED lighting of capacitive load, TRIAC dimmer can bring five large adverse effects, and therefore this is not a kind of light regulating technology of high-quality strictly speaking.First adverse effect is that TRIAC light modulation inevitably can the breakdown power factor, because its adopts and cuts ripple mode and carry out light modulation, particularly during degree of depth light modulation, it is very low that power factor can become, and and then affect the quality of whole electrical network; Second largest adverse effect is that TRIAC light modulation meeting produces serious EMI interference, because when load is capacitive, controlled silicon conducting cut-off meeting produces strong surging on output current wave, and this burst current can bring serious EMI to disturb; The third-largest adverse effect is that TRIAC light modulation meeting causes the power supply conversion efficiency of whole light fixture low, and when carrying out degree of depth light modulation, efficiency can be lower than 20%; The fourth-largest adverse effect is that TRIAC dimmer and LED lighting are unmatched, and this easily causes output optical flare problem, affects consumer's experience, even can bring health problem; The fifth-largest adverse effect is that TRIAC dimmer can bring serious THD (total harmonic distortion) problem, and international energy standard starts the strict THD standard of requirement as the compatibility test EN61000-3-2 of current harmonics standard.
Summary of the invention
(1) technical problem that will solve
In view of above-mentioned technical problem, the invention provides a kind of LED constant current PWM drive circuit and three-primary color LED mixed light drive circuit, to improve the TRIAC light modulation scheme of existing LED, overcome above Five problems.
(2) technical scheme
According to an aspect of the present invention, provide a kind of LED constant current PWM drive circuit.This LED constant current PWM drive circuit comprises: three terminal bidirectional switching circuit, be connected with AC power, and for the sinusoidal ac signal that AC power is provided, convert sinusoidal chopped waveform signal to; PWM waveform signal produces circuit, is connected, for utilizing sinusoidal chopped waveform signal to produce PWM waveform signal with three terminal bidirectional switching circuit; LED constant-current drive circuit, produces circuit with PWM waveform signal and is connected, and for utilizing PWM waveform signal to control the turn-on and turn-off of LED light source, thereby the constant current PWM that realizes LED drives.
According to another aspect of the present invention, also provide a kind of three-primary color LED mixed light drive circuit.This three-primary color LED mixed light drive circuit comprises: a LED constant current PWM drive circuit, the 2nd LED constant current PWM drive circuit and the 3rd LED constant current PWM drive circuit; Wherein, these three LED constant current PWM drive circuits are above-mentioned LED constant current PWM drive circuit, drive respectively red-light LED light source, blue-ray LED light source and green light LED light source.
(3) beneficial effect
From technique scheme, can find out, LED constant current PWM drive circuit of the present invention and three-primary color LED mixed light drive circuit have following beneficial effect:
(1) directly to drive load be resistive load to three terminal bidirectional switch (TRIAC) circuit, is not capacitive load, thereby this technical scheme can guarantee high power factor, can not affect the quality of whole electrical network;
(2) directly to drive load be resistance to three terminal bidirectional switch (TRIAC) circuit, thereby this technical scheme can not produce strong surging in output waveform, then can not bring serious EMI to disturb;
(3) directly to drive load be resistance to three terminal bidirectional switch (TRIAC) circuit, power supply conversion efficiency is mainly determined by the efficiency of LED constant current PWM drive circuit, obviously, the efficiency of the LED constant current PWM drive circuit in this technical scheme is higher than traditional TRIAC light modulation;
(4) adopt constant current driving and PWM regulation and control, high with LED light fixture compatibility;
(5) because three terminal bidirectional switch (TRIAC) circuit in this technical scheme is linear, with PWM, regulate, do not have harmonic wave to produce, also just there will not be the problem of THD.
Accompanying drawing explanation
Fig. 1 is according to the structural representation of embodiment of the present invention LED constant current PWM drive circuit;
Fig. 2 is the structural representation of three terminal bidirectional switching circuit in the PWM of LED constant current shown in Fig. 1 drive circuit;
Fig. 3 is the structural representation that in the PWM of LED constant current shown in Fig. 1 drive circuit, PWM waveform signal produces circuit;
Fig. 4 is the structural representation of LED constant-current drive circuit in the PWM of LED constant current shown in Fig. 1 drive circuit;
Fig. 5 is part of nodes waveform signal figure in the constant current of LED shown in Fig. 1 PWM drive circuit;
Fig. 6 is according to the structural representation of embodiment of the present invention three-primary color LED mixed light drive circuit.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with specific embodiment, and with reference to accompanying drawing, the present invention is described in more detail.It should be noted that, in accompanying drawing or specification description, similar or identical part is all used identical figure number.The implementation that does not illustrate in accompanying drawing or describe is form known to a person of ordinary skill in the art in affiliated technical field.In addition, although the demonstration of the parameter that comprises particular value can be provided herein, should be appreciated that, parameter is without definitely equaling corresponding value, but can in acceptable error margin or design constraint, be similar to corresponding value.
The invention provides a kind of LED constant current PWM drive circuit and the three-primary color LED mixed light drive circuit based on this LED constant current PWM drive circuit.In this LED constant-current drive circuit, comprise negative feedback circuit of temperature, make LED can automatically reduce operating current under excessive temperature, prevent that temperature from further rising, guaranteed high efficiency and the long life-span of LED.
In first exemplary embodiment of the present invention, provide a kind of LED constant current PWM drive circuit.Fig. 1 is the structural representation of first embodiment of the invention LED constant current PWM drive circuit.Please refer to Fig. 1, the present embodiment LED constant current PWM drive circuit comprises:
Three terminal bidirectional switch (TRIAC) circuit, is connected with AC power, for the sinusoidal ac signal that AC power is provided, converts sinusoidal chopped waveform signal to;
PWM waveform signal produces circuit, is connected, for utilizing described sinusoidal chopped waveform signal to produce PWM waveform signal with three terminal bidirectional switching circuit;
LED constant-current drive circuit, produces circuit with described PWM waveform signal and is connected, and for utilizing the turn-on and turn-off of described PWM waveform signal control LED light source, thereby realizes the constant current PWM driving of LED.
Below respectively each part in the present embodiment LED constant-current drive circuit is elaborated.
Three terminal bidirectional switching circuit
Fig. 2 is the structural representation of three terminal bidirectional switching circuit in LED constant-current drive circuit shown in Fig. 1.Please refer to Fig. 2, this three terminal bidirectional switching circuit comprises:
Two RC delay loops, its input is connected to AC power V
acfirst end, for to AC power V
acoutput signal postpones, and comprising:
The first capacitor C 1, its first end is connected to AC power V
acfirst end;
The second capacitor C 2, its first end is connected to AC power V
acfirst end;
The 4th resistance R 4, its first end is connected to the second end of the first capacitor C 1, and its second end is connected to the second end of the second capacitor C 2;
The 3rd resistance R 3, its first end is connected to the second end of the first capacitor C 1;
Three terminal bidirectional switch (TRIAC), its second plate end is connected to AC power V
acfirst end, it controls extreme the second end that is connected to the second capacitor C 2 in pair RC delay loops by bidirectional trigger diode (DIAC), its first anode end is connected to the second end of the 3rd resistance R 3;
The the first load resistance R1 and the second load resistance R2 that mutually connect, wherein, the first end of the first load resistance R1 is connected to AC power V
acthe second end, the second end of the second load resistance R2 is connected to the second end of the 3rd resistance R 3.
Wherein, the first end of the first load resistance R1 is as the first output of this three terminal bidirectional switching circuit, and its second end is as the second output of this three terminal bidirectional switching circuit.
In the present embodiment, AC power V
acalternating voltage for 220V.
Two RC delay loops can make three terminal bidirectional switching delay start, until arrive the trigger point voltage of bidirectional trigger diode DIAC.And the 3rd resistance R 3 and the 4th resistance R 4 all can be adjusted in two RC delay loops, thereby change ON time.
In addition, the resistance of the first load resistance R1 and the second load resistance R2 also can be adjusted.By adjusting both resistances, thereby can change the amplitude of this three terminal bidirectional switching circuit output signal.
PWM waveform signal produces circuit
Fig. 3 be shown in Fig. 1 in LED constant-current drive circuit PWM waveform signal produce the structural representation of circuit.Please refer to Fig. 3, this PWM waveform signal produces circuit and comprises:
The bridge rectifier Z being formed by four diodes, its first end is connected to the first output of three terminal bidirectional switching circuit, and its second end is connected to the second output of three terminal bidirectional switching circuit, and its 3rd end is connected to ground;
Zero-crossing comparator EA1, its negative-phase input is connected to ground, and its normal phase input end is connected to the 4th end of bridge rectifier Z, and its output is the output that PWM waveform signal produces circuit.
Bridge rectifier Z is for the sinusoidal chopping signal rectification of three terminal bidirectional switching circuit output being obtained to the rectified waveform signal of sinusoidal chopped waveform, and zero-crossing comparator EA1 is for changing into PWM waveform signal by the rectified waveform signal of sinusoidal chopped waveform.
LED constant-current drive circuit
Fig. 4 is the structural representation of the LED constant-current drive circuit in LED constant-current drive circuit shown in Fig. 1.Please refer to Fig. 4, this LED constant-current drive circuit comprises:
Voltage comparator EA2, its normal phase input end is connected to the 1.43V (relevant with the resistance of R6, R7 with the electric current of the LED that flows through) of reference voltage-Yue;
Triode Q, its base stage is connected to the output that PWM waveform signal produces circuit, and its collector electrode is connected to the negative pole of LED light source, and is connected to ground by the feedback resistance RT of positive temperature coefficient;
Amplifier Av, its normal phase input end is connected to ground by the 7th resistance R 7, and its negative input is connected to the emitter of triode Q; Its output is connected to its forward output by the 6th resistance R 6, and is connected to the negative input of voltage comparator EA2;
Adjust pipe PMOS, its grid is connected to the output of voltage comparator EA2, and its drain electrode is connected to the positive pole of LED light source, and its source electrode is connected to circuit power V
iN.
Circuit power V
iNpower on, change range of input voltage is 6.5V～30V, and reference voltage produces reference voltage, and is input to the normal phase input end of voltage comparator EA2.Utilize the feedback resistance RT of positive temperature coefficient to set the electric current of the LED that flows through.Av amplifier is input to the negative-phase input of voltage comparator EA2 after the detection voltage ratio of the feedback resistance RT of positive temperature coefficient is amplified.Amplifier Av, voltage comparator EA2 and adjustment pipe PMOS form negative feedback network, for regulation output electric current.When output current changes, the voltage at the feedback resistance RT two ends of positive temperature coefficient after amplifying and reference voltage comparison, after both differences are exaggerated for controlling the grid of adjusting pipe, thereby stabilizing output current.Thereby the turn-on and turn-off that just can control triode Q by the pwm signal of PWM waveform signal generation circuit output realize the brightness adjustment control to LED light source.The resistance of positive temperature coefficient has positive temperature coefficient, and along with ambient temperature raises, it is large that its resistance becomes, thereby the electric current of the LED light source that makes to flow through diminishes, and then reduces the power consumption of circuit, reduces temperature.The resistance of positive temperature coefficient can play the degenerative effect of temperature, is conducive to prevent the temperature rise of LED light source and causes the problems such as decrease in efficiency and life-span minimizing.
In the present invention, adjusting pipe can be a PMOS or NMOS pipe.Wherein, LED light source is the LED array of the LED pipe composition of single led pipe or a plurality of series connection and/or parallel connection.
Fig. 5 is part of nodes waveform signal figure in the constant current of LED shown in Fig. 1 PWM drive circuit.Please refer to Fig. 5, the corresponding input of dotted line (light line) sinusoidal signal, solid line (dark line) representative part of nodes extracts in the present embodiment LED constant current PWM drive circuit signal P0, P1 and P2.P0 is the sinusoidal chopped waveform signal of being exported by three terminal bidirectional switching circuit, and from the signal waveform of P0, this three terminal bidirectional switching circuit is accurately by AC power V
acthe AC signal of the 220V of output is converted to its sinusoidal chopped waveform signal.P1 is the rectified waveform signal of the sinusoidal chopped waveform that obtains through bridge rectifier Z rectification, and P2 is the PWM waveform signal that PWM waveform signal produces circuit output.
So far, the present embodiment LED constant current PWM drive circuit is introduced complete.
In second exemplary embodiment of the present invention, also provide a kind of three-primary color LED mixed light drive circuit based on above-mentioned LED constant current PWM drive circuit.
Fig. 6 is according to the structural representation of embodiment of the present invention three-primary color LED mixed light drive circuit.Please refer to Fig. 6, the present embodiment three-primary color LED mixed light drive circuit comprises: a LED constant current PWM drive circuit, the 2nd LED constant current PWM drive circuit and the 3rd LED constant current PWM drive circuit.These three LED constant current PWM drive circuits are above-mentioned LED constant current PWM drive circuit, and its input is connected to AC power V
aC, drive respectively red-light LED light source, blue-ray LED light source and green light LED light source.
By the 3rd resistance R 3 in LED constant current PWM drive circuit and the 4th resistance R 4, can change the ON time of three terminal bidirectional switching circuit, thereby change the duty ratio of the sinusoidal chopped waveform of its output, thereby the duty ratio that regulates PWM waveform signal, has realized the light modulation to LED light source then.Wherein, the adjustable extent of the 3rd resistance R 3 and the 4th resistance R 4 is 300k Ω～600k Ω, depending on the capacitance decision of ac frequency, the first capacitor C 1 and the second capacitor C 2.By three LED light sources in three LED constant current PWM drive circuits are carried out to light modulation, can change the ratio of RGB tri-coloured light, thereby regulate the colour temperature after RGB tri-coloured light mixed lights.
So far, by reference to the accompanying drawings the present invention two embodiment be have been described in detail.According to above, describe, those skilled in the art should have clearly understanding to LED constant current PWM drive circuit of the present invention and three-primary color LED mixed light drive circuit.
In addition, the above-mentioned definition to each element and method is not limited in various concrete structures, shape or the mode of mentioning in embodiment, and those of ordinary skills can change simply or replace it.
In sum, the invention provides a kind of LED constant current PWM drive circuit and three-primary color LED mixed light drive circuit.This LED constant current PWM drive circuit is changed into resistive load by the capacitive load of LED light source, thereby has guaranteed high power factor, can not affect the quality of whole electrical network, has high using value.
Above-described specific embodiment; object of the present invention, technical scheme and beneficial effect are further described; institute is understood that; the foregoing is only specific embodiments of the invention; be not limited to the present invention; within the spirit and principles in the present invention all, any modification of making, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a LED constant current PWM drive circuit, is characterized in that, comprising:
Three terminal bidirectional switching circuit, is connected with AC power, for the sinusoidal ac signal that AC power is provided, converts sinusoidal chopped waveform signal to;
PWM waveform signal produces circuit, is connected, for utilizing described sinusoidal chopped waveform signal to produce PWM waveform signal with described three terminal bidirectional switching circuit;
LED constant-current drive circuit, produces circuit with described PWM waveform signal and is connected, and for utilizing the turn-on and turn-off of described PWM waveform signal control LED light source, thereby realizes the constant current PWM driving of LED.
2. LED constant current PWM drive circuit according to claim 1, is characterized in that, described LED constant-current drive circuit comprises:
Voltage comparator (EA2), its normal phase input end is connected to reference voltage;
Triode (Q), its base stage is connected to the output that described PWM waveform signal produces circuit, and its collector electrode is connected to the negative pole of LED light source, and is connected to ground by the feedback resistance (RT) of positive temperature coefficient;
Amplifier (Av), its normal phase input end is connected to ground by the 7th resistance (R7), and its negative input is connected to the emitter of triode (Q); Its output is connected to its forward output by the 6th resistance (R6), and is connected to the negative input of voltage comparator (EA2);
Adjust pipe, its grid is connected to the output of voltage comparator (EA2), and its drain electrode is connected to the positive pole of LED light source, and its source electrode is connected to circuit power (V
iN).
3. LED constant current PWM drive circuit according to claim 2, is characterized in that, described adjustment pipe is PMOS pipe or NMOS pipe.
4. LED constant current PWM drive circuit according to claim 2, is characterized in that described circuit power V
iNchange range of input voltage is 6.5V～30V.
5. LED constant current PWM drive circuit according to claim 2, is characterized in that, described LED light source is the LED array that the LED pipe of single led pipe or a plurality of series connection and/or parallel connection forms.
6. according to the LED constant current PWM drive circuit described in any one in claim 1 to 5, it is characterized in that, the sinusoidal chopped waveform signal of described three terminal bidirectional switching circuit output is exported by its first output and the second output, and described PWM waveform signal produces circuit and comprises:
Bridge rectifier (Z), by four diodes, formed, its first end is connected to the first output of described three terminal bidirectional switching circuit, its second end is connected to the second output of described three terminal bidirectional switching circuit, its the 3rd end is connected to ground, and this bridge rectifier (Z) obtains the sinusoidal chopping signal rectification of three terminal bidirectional switching circuit output the rectified waveform signal of sinusoidal chopped waveform;
Zero-crossing comparator (EA1), its negative-phase input is connected to ground, its normal phase input end is connected to the 4th end of described bridge rectifier (Z), its output is the output that PWM waveform signal produces circuit, and the rectified waveform signal that this zero-crossing comparator (EA1) is exported sinusoidal chopped waveform by described bridge rectifier (Z) changes into PWM waveform signal.
7. according to the LED constant current PWM drive circuit described in any one in claim 1 to 5, it is characterized in that, described three terminal bidirectional switching circuit comprises:
Two RC delay loops, its input is connected to AC power V
acfirst end, for to AC power V
acoutput signal postpones, and comprising:
The first electric capacity (C1), its first end is connected to AC power V
acfirst end;
The second electric capacity (C2), its first end is connected to AC power V
acfirst end;
The 4th resistance (R4), its first end is connected to the second end of the first electric capacity (C1), and its second end is connected to the second end of the second electric capacity (C2);
The 3rd resistance (R3), its first end is connected to the second end of the first electric capacity (C1);
Three terminal bidirectional switch (TRIAC), its second plate end is connected to AC power V
acfirst end, it controls the second end that is extremely connected to the second electric capacity (C2) in described pair of RC delay loop by bidirectional trigger diode (DIAC), its first anode end is connected to the second end of the 3rd resistance (R3);
The first load resistance (R1) and second load resistance (R2) of mutually connecting, wherein, the first end of the first load resistance (R1) is connected to AC power V
acthe second end, the second end of the second load resistance (R2) is connected to the second end of the 3rd resistance (R3).
Wherein, the first end of the first load resistance (R1) is as the first output of this three terminal bidirectional switching circuit, and its second end is as the second output of this three terminal bidirectional switching circuit.
8. LED constant current PWM drive circuit according to claim 7, is characterized in that described AC power V
acthe alternating voltage of output 220V.
9. LED constant current PWM drive circuit according to claim 7, it is characterized in that, described the 3rd resistance (R3) and the 4th resistance (R4) are adjustable resistance, and wherein, the adjustable extent of the 3rd resistance (R3) and the 4th resistance (R4) is between 300k Ω～600k Ω;
By regulating the resistance of the 3rd resistance (R3) and the 4th resistance (R4), change the ON time of described three terminal bidirectional switching circuit, thereby change the duty ratio that it exports sinusoidal chopped waveform, and then regulate PWM waveform signal to produce the duty ratio of circuit output PWM waveform signal, finally regulate the brightness of LED light source.
10. a three-primary color LED mixed light drive circuit, is characterized in that, comprising: a LED constant current PWM drive circuit, the 2nd LED constant current PWM drive circuit and the 3rd LED constant current PWM drive circuit;
Wherein, these three LED constant current PWM drive circuits are the LED constant current PWM drive circuit described in any one in claim 1 to 9, drive respectively red-light LED light source, blue-ray LED light source and green light LED light source.
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| CN109686205A (en) * | 2017-10-19 | 2019-04-26 | 商丘工学院 | Highlighted LED formula three primary colours composition principle demonstrator based on light regulating technology |
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| Publication number | Publication date |
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| CN103763825B (en) | 2015-12-30 |
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