CN101420802A - The LED constant-current source that is used for the AC controllable silicon light modulation mode of illuminator - Google Patents
The LED constant-current source that is used for the AC controllable silicon light modulation mode of illuminator Download PDFInfo
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Abstract
The present invention relates to a kind of LED constant-current source that is used for the AC controllable silicon light modulation mode of illuminator, it comprises AC TODC power supply, LED tunable optical constant-current source, led light source, V/F translation circuit, voltage sample circuit, mains waveform correction circuit, rectification circuit, also comprises the messaging software that is solidificated in the chip; AC TO DC power supply provides power supply for system; Civil power through controllable silicon light modulation enters rectification circuit, output is taken out dimmer voltage by voltage sample circuit and is sent V/F translation circuit after mains waveform corrects circuit to correct processing, V/F translation circuit output PWM dim signal driving LED tunable optical constant-current source, and then realize the light modulation of LED silicon controlled, solved the compatibility of LED illumination with traditional lighting.Thisly be adapted to constant-current source, aspect the LED illumination that requires under controllable silicon light modulation mode, very big application prospect arranged at the LED of illuminator AC controllable silicon light modulation mode.
Description
Affiliated technical field
The present invention relates to a kind of controller of illuminator light modulation, more specifically, particularly a kind of LED constant-current source that is used for the AC controllable silicon light modulation mode of illuminator.
Background technology
Along with science and technology development, at present, semiconductor light-emitting-diode is LED just, and it has begun commercialization as a kind of novel illumination.The LED illumination is a kind of brand-new lighting technology; because of have the life-span long, energy-conservation, color is controlled, safety, environmental protection, spectrum are good, colour purity, light efficiency height; characteristics such as no ultraviolet radiation; be described as the revolution for the third time of human illumination; the many advantages of LED make it obtain positive popularization; special under the situation that current global energy crisis, environmental requirement improve constantly; low-power consumption, long-life semiconductor lighting (LED illumination) by universally acknowledged be a kind of important channel of energy-conserving and environment-protective; therefore, the current whole world is all being popularized application LED illumination in an all-round way.Because LED is a semiconductor, its type of drive can not directly drive with civil power as traditional lighting; Dimming mode can not be as traditional incandescent lamp or Halogen lamp LED, adds a controllable silicon dimmer at its input it is carried out phase-cut dimming.At present, LED drives with constant-current source, and its light modulation is than higher pwm pulse light modulation by regulating frequency.Because being constant-current supply, LED drives, the PWM light modulation, therefore, at its input, except two power lines are arranged, also has a light modulation line, this makes the light modulation of LED not come light modulation with the mode of regulating its both end voltage size as traditional incandescent lamp or Halogen lamp LED.The LED illumination is as an excessive illuminating product, and is how compatible fully with existing wiring aspect the control of circuit, will be to apply the road that the LED illumination will be walked.
Summary of the invention
The object of the present invention is to provide a kind of LED constant-current source that is used for the AC controllable silicon light modulation mode of illuminator, LED can linear flicker free the traditional AC controllable silicon light modulation mode light modulation down of acceptance, solved the compatibility issue of LED illumination and traditional lighting.
In order to achieve the above object, technical scheme of the present invention is:
Described a kind of LED constant-current source that is used for the AC controllable silicon light modulation mode of illuminator, it comprises: controllable silicon dimmer, AC TO DC power supply, LED tunable optical constant-current source, led light source, V/F (voltage-PWM conversion, down together) translation circuit, voltage sample circuit, mains waveform are corrected circuit, rectification circuit; Civil power divides two-way through controllable silicon dimmer output, and the first via is given AC TO DC power supply, and exports two groups of voltages, gives the power supply of LED tunable optical constant-current source and V/F (PWM) translation circuit respectively; The second the tunnel send rectification circuit, after after the electric main of controllable silicon light modulation is by rectification, sending mains waveform to correct circuit to correct, the cut ripple appears, the voltage effective value of the waveform correspondence of exporting after the controllable silicon light modulation rectification is: 40VDC～220VDC, 40VDC～220VDC is 0～5V through the voltage sample circuit output voltage corresponding with it, 0～5V is available dimmer voltage, this dimmer voltage is through V/F (PWM) translation circuit, output duty cycle is 0%～100% PWM dim signal, the PWM dim signal directly send LED tunable optical constant-current source, and the luminous brightness of the led light source that LED tunable optical constant-current source drives after light modulation is corresponding with 0%～100% PWM dim signal.
Be specially:
The LED constant-current source that is used for the AC controllable silicon light modulation mode of illuminator, it comprises controllable silicon dimmer (2), AC TODC power supply (3), LED tunable optical constant-current source (4), led light source (5), V/F (PWM) translation circuit (6), voltage sample circuit (7), mains waveform correction circuit (8), rectification circuit (9);
Its annexation: electric main divides two the tunnel through controllable silicon dimmer (2) output, the first via connects AC TO DC power supply (3), the second the tunnel connects rectification circuit (9), two groups of voltages of AC TO DC power supply (3) output, first group of voltage is connected on the LED tunable optical constant-current source (4), LED tunable optical constant-current source (4) output connects led light source (5), second group of voltage is connected on V/F (PWM) translation circuit (6), rectification circuit (9) output connects mains waveform and corrects circuit (8) and voltage sample circuit (7), the dimmer voltage of voltage sample circuit (7) output is led to V/F (PWM) conversion (6), and the pwm signal of V/F (PWM) conversion (6) output links to each other with the light modulation port of LED tunable optical constant-current source (4);
Controlled step is:
A), AC TO DC power supply (3) provides power supply for V/F (PWM) translation circuit (6) and LED tunable optical constant-current source (4);
B), sending mains waveform to correct circuit (8) after the electric main of controllable silicon light modulation is by rectification circuit (9) rectification corrects, obtain the cut ripple of 40VDC～220VDC, the cut ripple of 40VDC～220VDC takes out the 0～5V dimmer voltage corresponding with it through voltage sample circuit (7), the dimmer voltage of 0～5V is 0%～100% PWM dim signal through V/F (PWM) translation circuit (6) output and its duty ratio corresponding, the PWM dim signal directly send LED tunable optical constant-current source (4), LED tunable optical constant-current source (4) the output electric current corresponding with 0%～100% PWM dim signal is connected on the led light source (5), directly driving LED light source (5).
Described AC TO DC power supply (3) comprises capacitor C 1～C9, resistance R 1～R9, diode D1～D3, rectifier bridge BR1, chip NCP1027, LM7805, TL431, photoelectric coupling circuit PC817 and transformer T1.
Described LED tunable optical constant-current source (4), it comprises chip MAX16820, resistance R 14, capacitor C 13, C16, inductance L 1, metal-oxide-semiconductor Q1, diode D4.
Described V/F (PWM) translation circuit (6) comprises A/D converter (11) and MCU microprocessor (12).
Described V/F (PWM) translation circuit (6) can also be made up of triangle wave generating circuit and voltage comparator, and it comprises amplifier LM324 and resistance R 20～R26, capacitor C 11, triode Q2, current-limiting resistance R27, photoelectric coupling circuit U8;
Amplifier LM324 (1) (2) and resistance R 20～R26, capacitor C 11, triode Q2 connects to form triangle wave generating circuit, the triangular wave that triangle wave generating circuit produces is connected to inverting input 9 pin of comparator LM324 (3) from the 1st pin output of amplifier LM324 (1), the dimmer voltage of 0～5V is connected to in-phase input end 10 pin of LM324 (3), and and the triangular wave that produces of triangle wave generating circuit relatively, the pwm signal that output pin the 8th pin of LM324 (3) is exported relatively meets current-limiting resistance R27 and is connected on the photoelectric coupling circuit U8, and the another side of photoelectric coupling circuit U8 is delivered to the PWM dim signal on the LED tunable optical constant-current source (4).
Described mains waveform is corrected circuit (8), and it comprises resistance R 10, and the span of resistance R 10 is: 3K～40K, R10 are and are connected on the 2nd pin of rectifier bridge BR2 and the 4th pin.
The effect of invention
1, solved the light modulation of LED illumination on traditional controllable silicon light modulation circuit.
2, the brightness adjustment control good linearity is not glimmered.
3, circuit and existing circuit compatibility are installed.
4, can realize logarithmic or non-logarithmic light modulation by software programming.
5, stand-by power consumption is low.
Description of drawings
Fig. 1 is a schematic block circuit diagram of the present invention.
Fig. 2 is the light adjusting circuit schematic diagram of MCU control of the present invention.
Fig. 3 is the light adjusting circuit schematic diagram that triangular wave of the present invention is compared with dimmer voltage.
Fig. 4 is the wiring schematic diagram of the present invention on construction line.
Fig. 5 is software principle figure of the present invention.
Fig. 6 is that the present invention is solidificated in the software main program flow chart on the MCU microprocessor (12).
Embodiment
The present invention is further described below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, be schematic block circuit diagram of the present invention, it comprises: electric main (1), controllable silicon dimmer (2), AC TODC power supply (3), LED tunable optical constant-current source (4), led light source (5), V/F (PWM) translation circuit (6), voltage sample circuit (7), mains waveform are corrected circuit (8), rectification circuit (9);
Its annexation: electric main (1) divides two the tunnel through controllable silicon dimmer (2) output, the first via connects AC TO DC power supply (3), the second the tunnel connects rectification circuit (9), two groups of voltages of AC TO DC power supply (3) output, first group of voltage is connected on the LED tunable optical constant-current source (4), LED tunable optical constant-current source (4) output connects led light source (5), second group of voltage is connected on V/F (PWM) translation circuit (6), rectification circuit (9) output connects mains waveform and corrects circuit (8) and voltage sample circuit (7), the dimmer voltage of voltage sample circuit (7) output is led to V/F (PWM) conversion (6), and the pwm signal of V/F (PWM) conversion (6) output links to each other with the light modulation port of LED tunable optical constant-current source (4);
Controlled step is:
A), AC TO DC power supply (3) provides power supply for V/F (PWM) translation circuit (6) and LED tunable optical constant-current source (4);
B), sending mains waveform to correct circuit (8) after the electric main of controllable silicon light modulation is by rectification circuit (9) rectification corrects, obtain the cut ripple of 40VDC～220VDC, the cut ripple of 40VDC～220VDC takes out the 0～5V dimmer voltage corresponding with it through voltage sample circuit (7), the dimmer voltage of 0～5V is 0%～100% PWM dim signal through V/F (PWM) translation circuit (6) output and its duty ratio corresponding, the PWM dim signal directly send LED tunable optical constant-current source (4), LED tunable optical constant-current source (4) the output electric current corresponding with 0%～100% PWM dim signal is connected on the led light source (5), directly driving LED light source (5).
Fig. 2 is the light adjusting circuit schematic diagram of MCU microprocessor control of the present invention.
As shown in the figure, it comprises; Controllable silicon dimmer (2), AC TO DC power supply (3), LED tunable optical constant-current source (4), led light source (5), V/F (PWM) translation circuit (6), voltage sample circuit (7), mains waveform are corrected circuit (8), rectification circuit (9).
Among the figure, electric main is about 40VAC～220VA through the effective value of controllable silicon dimmer (2) output, one the tunnel is connected with rectification circuit (9), the cut direct current that rectifier bridge BR2 in the rectification circuit (9) becomes 40VAC～220VAC, direct current after the resistance R 10 that mains waveform is corrected circuit (8) is corrected to do not have a cut ripple of burr, the effective voltage value of cut ripple is about 40VDC～220VDC, R10 is when correcting circuit as waveform, best value is: 3K～40K, resistance R 11～the R13 of 40VDC～220VDC on voltage sample circuit (7), R15～R16 dividing potential drop, capacitor C 10 filtering, obtain the voltage of about 0～5V, wherein, capacitor C 10 is connected in parallel on the resistance R 13, because will isolating of circuit coldly with thermally, so resistance R 11～R12, the value of R15～R16 is bigger, to realize safe isolation, the negative pole of capacitor C 10 links to each other with low pressure ground, positive pole send A/D converter (11) as the voltage of exporting 0～5V after the filtering, promptly send on V/F (PWM) translation circuit of being made up of A/D converter (11) and MCU microprocessor (12) (6); The voltage of 0～5V send A/D converter (11), after analog-to-digital conversion, giving MCU microprocessor (12) by spi bus handles, send 0～100% PWM dim signal after the processing with 0～5V duty ratio corresponding, the 3rd pin of constant current chip MAX16820 in 0～100% PWM dim signal and the LED tunable optical constant-current source (4) is connected, and constant current chip MAX16820 exports corresponding current drives led light source (5) according to dim signal.Wherein, capacitor C 14, C15 crystal oscillator Y1 form the required clock circuit of MCU microprocessor (12) work, for MCU microprocessor (12) work provides the clock source, capacitor C 12, resistance R 17 are formed the reset circuit of MCU microprocessor (12), and C11 is the filter capacitor of power supply.Wherein, MCU microprocessor (12) can be selected the MCU microprocessor of built-in A/D converter such as microprocessor of STC12C2052AD or ATmega series or the like for use, it is MAX1116 that the present invention selects A/D converter (11) for use, and MCU microprocessor (12) is performance of the present invention for AT89C2051 illustrates.
Receive on the AC TO DC power supply (3) on another road, AC TO DC power supply (3) output divides two-way, one the tunnel gives LED tunable optical constant-current source (4) power supply, and another road powers to LM7805, and LM7805 obtains stable 5V voltage and send MCU microprocessor (12) and A/D converter (11); AC TO DC power supply (3) can be operated between 35VDC～265VDC, because the dimmer voltage of 40VDC～220VDC correspondence is 0～5V, and the duty ratio of the PWM dim signal of the dimmer voltage correspondence of 0～5V is 0%～100%, that is to say the power and 0%～100% that led light source consumes, corresponding, so it also is corresponding with the duty ratio of PWM dim signal can regarding AC TODC power supply (3) as power output, voltage is high more, the power of AC TO DC power supply (3) output is just big more, otherwise just more little, so AC TO DC power supply (3) output can operate as normal.
Fig. 3 is the light adjusting circuit schematic diagram that triangular wave of the present invention is compared with dimmer voltage.
As shown in the figure, it mainly comprises: controllable silicon dimmer (2), AC TO DC power supply (3), LED tunable optical constant-current source (4), led light source (5), V/F (PWM) translation circuit (6), voltage sample circuit (7), mains waveform are corrected circuit (8), rectification circuit (9);
As we know from the figure, its work basic principle is identical with Fig. 2 substantially, different is in V/F (PWM) translation circuit, Fig. 2 adopts A/D converter (11) that the dimmer voltage of 0～5V is converted to digital signal to give MCU microprocessor (12) processing by spi bus, the result that MCU microprocessor (12) is handled produces 0%～100% PWM dim signal and send LED tunable optical constant-current source (4), and in Fig. 3, amplifier LM324 (1) (2) and resistance R 20～R26, capacitor C 11 and triode Q2 form triangle wave generating circuit, LM324 (3) is a comparator, the triangular wave that triangle wave generating circuit produces is connected to inverting input 9 pin of comparator LM324 (3) from the 1st pin output of amplifier LM324 (1), 0～5V dimmer voltage of corresponding 40V～265V that voltage sample circuit (7) is obtained compares from the triangular wave that in-phase input end 10 pin enter also and triangle wave generating circuit produces of LM324 (3), in the voltage of 0～5V, voltage is high more, duty ratio is big more, dimmer voltage is that 0～5V changes during light modulation, so V/F (PWM) translation circuit (6) is 0%～100% PWM dim signal according to the big or small output duty cycle of dimmer voltage, the PWM dim signal of output is through current-limiting resistance R27 current limliting rear drive photoelectric coupling circuit U8, thereby the PWM dim signal is delivered on the LED tunable optical constant-current source (4), and realized the isolation on cold and hot ground.
Fig. 4 is the wiring schematic diagram of the present invention on construction line.
As shown in the figure, L, the N line of two line electric mains (1) enter, and enter control circuit of the present invention (10) after controllable silicon dimmer (2) light modulation, and control circuit of the present invention (10) output is worth corresponding constant current with light modulation and is connected on the led light source (5).
Fig. 5 is software principle figure of the present invention.
As shown in the figure, the LED constant-current source that is used for the AC controllable silicon light modulation mode of illuminator, be solidificated in the software module on the MCU microprocessor (12), comprise: read A/D conversion value module (13), A/D conversion value judge module (14), light modulation value correcting process module (15), the PWM value that more renews and export new PWM dim signal processing module (16), primary control program (17); Primary control program (17) with read A/D conversion value module (13) intercommunication, primary control program (17) with A/D conversion value judge module (14), light modulation value correcting process module (15), the PWM value that more renews and export new PWM dim signal processing module (16) and be connected.
Fig. 6 is that the present invention is solidificated in the software main program flow chart on the MCU microprocessor (12).
As shown in the figure, the software main program flow process that is solidificated on the MCU microprocessor (12) is: powering on enters " system initialization " (18), enter " reading the A/D conversion value " (19), enter judgement " the A/D conversion value changes? " (20), if, enter " doing light modulation value correcting process " (21), enter " the PWM value that more renews is also exported new PWM dim signal " (22), finishing turns back to " reading the A/D conversion value " (19); If not, enter " reading the A/D conversion value " (19).
The present invention is specially adapted to use as occasion light modulations such as market, hotel, family expenses under the illuminator AC controllable silicon light modulation mode.
Though the present invention describes with reference to the above embodiments; but those of ordinary skill in the art; the above embodiment that recognizes that should be understood that only is the excellent example of explanation of the present invention; should understand and wherein can do each and change and revise and do not break away from the present invention in a broad sense; so be not as qualification of the present invention; as long as in connotation scope of the present invention, to the variation distortion of above-described enforcement or revise the protection range that all will fall into the requirement of right of the present invention.
Claims (8)
1, a kind of LED constant-current source that is used for the AC controllable silicon light modulation mode of illuminator, it comprises controllable silicon dimmer (2), AC TO DC power supply (3), LED tunable optical constant-current source (4), led light source (5), V/F (PWM) translation circuit (6), voltage sample circuit (7), mains waveform correction circuit (8), rectification circuit (9);
Its annexation: electric main divides two the tunnel through controllable silicon dimmer (2) output, the first via connects AC TO DC power supply (3), the second the tunnel connects rectification circuit (9), two groups of voltages of AC TO DC power supply (3) output, first group of voltage is connected on the LED tunable optical constant-current source (4), LED tunable optical constant-current source (4) output connects led light source (5), second group of voltage is connected on V/F (PWM) translation circuit (6), rectification circuit (9) output connects mains waveform and corrects circuit (8) and voltage sample circuit (7), the dimmer voltage of voltage sample circuit (7) output is led to V/F (PWM) conversion (6), and the pwm signal of V/F (PWM) conversion (6) output links to each other with the light modulation port of LED tunable optical constant-current source (4);
Controlled step is:
A), AC TO DC power supply (3) provides power supply for V/F (PWM) translation circuit (6) and LED tunable optical constant-current source (4);
B), sending mains waveform to correct circuit (8) after the electric main of controllable silicon light modulation is by rectification circuit (9) rectification corrects, obtain the cut ripple of 40VDC～220VDC, the cut ripple of 40VDC～220VDC takes out the 0～5V dimmer voltage corresponding with it through voltage sample circuit (7), the dimmer voltage of 0～5V is 0%～100% PWM dim signal through V/F (PWM) translation circuit (6) output and its duty ratio corresponding, the PWM dim signal directly send LED tunable optical constant-current source (4), LED tunable optical constant-current source (4) the output electric current corresponding with 0%～100% PWM dim signal is connected on the led light source (5), directly driving LED light source (5).
2, the LED constant-current source that is used for the AC controllable silicon light modulation mode of illuminator according to claim 1 is characterized in that:
Described AC TO DC power supply (3) comprises capacitor C 1～C9, resistance R 1～R9, diode D1～D3, rectifier bridge BR1, chip NCP1027, LM7805, TL431, photoelectric coupling circuit PC817 and transformer T1.
3, the LED constant-current source that is used for the AC controllable silicon light modulation mode of illuminator according to claim 1 is characterized in that:
Described LED tunable optical constant-current source (4), it comprises chip MAX16820, resistance R 14, capacitor C 13, C16, inductance L 1, metal-oxide-semiconductor Q1, diode D4.
4, the LED constant-current source that is used for the AC controllable silicon light modulation mode of illuminator according to claim 1 is characterized in that:
Described V/F (PWM) translation circuit (6) comprises A/D converter (11) and MCU microprocessor (12).
5, the LED constant-current source that is used for the AC controllable silicon light modulation mode of illuminator according to claim 1 is characterized in that:
Described V/F (PWM) translation circuit (6) can also be made up of triangle wave generating circuit and voltage comparator, and it comprises amplifier LM324 and resistance R 20～R26, capacitor C 11, triode Q2, current-limiting resistance R27, photoelectric coupling circuit U8;
Amplifier LM324 (1) (2) and resistance R 20～R26, capacitor C 11, triode Q2 connects to form triangle wave generating circuit, the triangular wave that triangle wave generating circuit produces is connected to inverting input 9 pin of comparator LM324 (3) from the 1st pin output of amplifier LM324 (1), the dimmer voltage of 0～5V is connected to in-phase input end 10 pin of LM324 (3), and and the triangular wave that produces of triangle wave generating circuit relatively, the pwm signal that output pin the 8th pin of LM324 (3) is exported relatively meets current-limiting resistance R27 and is connected on the photoelectric coupling circuit U8, and the another side of photoelectric coupling circuit U8 is delivered to the PWM dim signal on the LED tunable optical constant-current source (4).
6, the LED constant-current source that is used for the AC controllable silicon light modulation mode of illuminator according to claim 1 is characterized in that:
Described mains waveform is corrected circuit (8), and it comprises resistance R 10, and the span of resistance R 10 is: 3K～40K, resistance R 10 is and is connected on the 2nd pin of rectifier bridge BR2 and the 4th pin.
7, the LED constant-current source that is used for the AC controllable silicon light modulation mode of illuminator according to claim 1 is characterized in that:
Be solidificated in the software module on the MCU microprocessor (12), comprise: read A/D conversion value module (13), A/D conversion value judge module (14), light modulation value correcting process module (15), the PWM value that more renews and export new PWM dim signal processing module (16), primary control program (17); Primary control program (17) with read A/D conversion value module (13) intercommunication, primary control program (17) with A/D conversion value judge module (14), light modulation value correcting process module (15), the PWM value that more renews and export new PWM dim signal processing module (16) and be connected.
8, the LED constant-current source that is used for the AC controllable silicon light modulation mode of illuminator according to claim 1 is characterized in that:
The software main program flow process that is solidificated on the MCU microprocessor (12) is: powering on enters " system initialization " (18), enter " reading the A/D conversion value " (19), enter judgement " the A/D conversion value changes? " (20), if, enter " doing light modulation value correcting process " (21), enter " the PWM value that more renews is also exported new PWM dim signal " (22), finishing turns back to " reading the A/D conversion value " (19); If not, enter " reading the A/D conversion value " (19).
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2008
- 2008-12-02 CN CNA200810217734XA patent/CN101420802A/en active Pending
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