CN103369797A - Light adjustment device and method of LED (Light Emitting Diode) high-voltage direct current centralized power supply system - Google Patents
Light adjustment device and method of LED (Light Emitting Diode) high-voltage direct current centralized power supply system Download PDFInfo
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- CN103369797A CN103369797A CN2013103173718A CN201310317371A CN103369797A CN 103369797 A CN103369797 A CN 103369797A CN 2013103173718 A CN2013103173718 A CN 2013103173718A CN 201310317371 A CN201310317371 A CN 201310317371A CN 103369797 A CN103369797 A CN 103369797A
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Abstract
The invention discloses a light adjustment device and method of an LED (Light Emitting Diode) high-voltage direct current centralized power supply system. The light adjustment device comprises a power source management module, a direct-current power supply module and N electric current adjustment modules, wherein N is greater than or equal to 1, the power source management module is connected with the control signal receiving end of the direct-current power supply module, the input ends of the N electric current adjustment modules are respectively connected with the positive output end of the direct-current power supply module, the negative output end of the direct-current power supply module is grounded, and the output end of each electric current adjustment module is connected with a load. The light adjustment device has the advantages that the unified light adjustment of multiple loads is realized by adjusting the output voltage value of the direct-current power supply module; and the independent light adjustment of each LED load is realized by adjusting sawtooth signals (vsaw1) in each electric current adjustment module. When a multi-level driving technology is adopted by the light adjustment device, the light emitting efficiency of LEDs is improved, and the long service life of the LED loads is ensured.
Description
Technical field
The present invention relates to the technology of semiconductor illumination application field, be specifically related to a kind of light modulating device and method of LED high voltage direct current central power supply system.
Background technology
Along with the development of LED Lighting Industry, the application of LED illumination is more and more extensive, and the LED street lighting is exactly one of them important applied field, and LED centrally connected power supply technology is a kind of technology that is fit to very much field of street lamp lighting.Although field of street lamp lighting requires to have enough brightness, but at few time period of people Dimming suitably, improve brightness in the time period that the people is many, both can guarantee that brightness satisfied the demands, can play energy-conservation effect again, in the LED street lamp illumination system, add dimming function, can realize above purpose.
For LED high voltage direct current central power supply system, need to select different dimming modes according to different needs, this just requires system can realize unified light modulation, again can be to the independent light modulation of each load.Yet existing light regulating technology all only has a kind of dimming mode, namely can only realize independent light modulation, maybe can only realize unified light modulation.
Summary of the invention
For the shortcoming and deficiency that overcomes the prior art existence, the invention provides a kind of light modulating device and method of LED high voltage direct current central power supply system.
The present invention adopts following technical scheme:
A kind of light modulating device of LED high voltage direct current central power supply system comprises power management module A, dc power supply module B and N current regulating module C
1, C
2... C
N, described N 〉=1;
The power module control signal output of described power management module A is connected with the control signal receiving terminal of dc power supply module B, the positive output end of described dc power supply module B and the sawtooth signal v of power management module A
Saw1Output respectively with N current regulating module C
1, C
2... C
NInput connect, the negative output terminal ground connection of described dc power supply module B, the output of described each current regulating module is connected with load.
The structure of a described N current regulating module is all identical, but the design parameter in the structure can be not identical.
Described current regulating module is made of DC/DC circuit E and control circuit F, and described control circuit F is made of reference current circuit for generating 1, comparing cell 2, compensating network 3 and the management and control of DC/DC contactor signal generating circuit 4 processed.
Described reference current circuit for generating comprises the first resistance R 1, the second resistance R 2, the first comparator C omp1, the second comparator C omp2, the first amplifier K
1, the second amplifier K
2With first adder 5;
Wherein, an end of the first resistance R 1 connects the positive output end of dc power supply module B, and the other end links to each other with an end of the second resistance R 2, the in-phase input end of the first comparator C omp1 and the inverting input of the second comparator C omp2 respectively;
The other end ground connection of the second resistance R 2, the in-phase input end of the inverting input of the first comparator C omp1 and the second comparator C omp2 and sawtooth signal v
Saw1Link to each other; Sawtooth signal v wherein
Saw1A provides by power management module;
The output of the first comparator C omp1 and the first amplifier K
1Input link to each other the output of the second comparator C omp2 and the second amplifier K
2Input link to each other the first amplifier K
1Output link to each other the second amplifier K with an input of first adder 5
2Output link to each other with another input of first adder 5, the output of first adder 5 is reference current i
Ref
Described comparing cell 2 is made of the first subtracter 6, wherein the positive input termination reference current i of the first subtracter 6
Ref, the negative input termination flows through the current i of load
LED, the output of the first subtracter 6 connects the input of compensating network 3.
Described DC/DC contactor management and control signal generating circuit 4 processed is made of the 3rd comparator C omp3, and the reverse input end of described the 3rd comparator C omp3 connects the output of compensating network 3, and the in-phase input end of the 3rd comparator C omp3 is used for connecting sawtooth signal v
Saw2, the 3rd comparator C omp3 output DC/DC contactor management and control signal processed, described sawtooth signal v
Saw2Sent by Saw-tooth Signal Waveform Generator.
Described dc power supply module B is made of the pfc circuit and the AC/DC rectification circuit that connect successively.
A kind of light-dimming method of light modulating device of LED high voltage direct current central power supply system by regulating the output voltage values of dc power supply module B, is realized the unified light modulation of a plurality of loads; By regulating the sawtooth signal v in each current regulating module
Saw1, realize the independent dimming of each LED load.
In the described current regulating module, by regulating the first amplifier K
1With the second amplifier K
2Multiplication factor, make the reference current i of first adder output
RefA kind of in steady state value waveform, PWM waveform or the many level waveform.
Compared with prior art, the present invention has following effect:
The present invention both can by regulating the output voltage values of dc power supply module, realize the unified light modulation of whole system; Again can be by regulating separately the sawtooth signal v in each current regulating module
Saw1, realize the independent dimming of each LED load;
The present invention is simple in structure, and no color differnece changes in convenient, the stable and light modulation process of light modulation;
When adopting many level Driving technique, improve the luminous efficiency of LED, guaranteed the long-life of LED load.
Description of drawings
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structure chart of reference current circuit for generating among Fig. 1;
Fig. 3 is the circuit structure diagram of the embodiment of the invention 2;
Fig. 4 (a), (b) current waveform figure for flowing through in the load before the embodiment of the invention 2 light modulations, wherein (a) figure is the current waveform figure that flows through before the load D1 light modulation, (b) figure is the current waveform figure that flows through before the load D2 light modulation;
The current waveform figure that flows through in the load when Fig. 5 is the unified light modulation of embodiment of the invention realization, the current waveform figure that flows through when wherein (a) figure is load D1 light modulation, the current waveform figure that flows through when (b) figure is load D2 light modulation;
Fig. 6 is the current waveform figure that the embodiment of the invention flows through respectively in the different loads when realizing independent light modulation, the current waveform figure that flows through when wherein (a) figure is the independent light modulation of load D1, the current waveform figure that flows through when (b) figure is the independent light modulation of load D2.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment 1
As shown in Figure 1, a kind of light modulating device of LED high voltage direct current central power supply system comprises power management module A, dc power supply module B, a N current regulating module C
1, C
2... C
NAnd N load D
1, D
2... D
N, described N 〉=1, the output of described each current regulating module is connected with load.
The power module control signal output of described power management module A is connected with the control signal receiving terminal of dc power supply module B, the positive output end of described dc power supply module B and the sawtooth signal v of power management module A
Saw1Output respectively with N current regulating module C
1, C
2... C
NInput connect, the negative output terminal ground connection of described dc power supply module B, the output of described each current regulating module is connected with load.
Described dc power supply module B is made of the pfc circuit and the AC/DC rectification circuit that connect successively.
Described N current regulating module C
1, C
2... C
NStructure all identical, but the component parameters of disparate modules the inside can be not identical.
Described current regulating module is made of DC/DC circuit E and control circuit F, and described control circuit F is made of reference current circuit for generating 1, comparing cell 2, compensating network 3 and the management and control of DC/DC contactor signal generating circuit 4 processed.
As shown in Figure 2, described reference current circuit for generating comprises the first resistance R 1, the second resistance R 2, the first comparator C omp1, the second comparator C omp2, the first amplifier K1, the second amplifier K2 and first adder 5;
Wherein, an end of the first resistance R 1 connects the positive output end of dc power supply module B, and the other end links to each other with an end of the second resistance R 2, the in-phase input end of the first comparator C omp1 and the inverting input of the second comparator C omp2 respectively;
The other end ground connection of the second resistance R 2, the in-phase input end of the inverting input of the first comparator C omp1 and the second comparator C omp2 and sawtooth signal v
Saw1Link to each other; Sawtooth signal v wherein
Saw1Provided by power management module, use as control signal;
The output of the first comparator C omp1 links to each other with the input of the first amplifier K1, the output of the second comparator C omp2 links to each other with the input of the second amplifier K2, the output of the first amplifier K1 links to each other with an input of first adder 5, the output of the second amplifier K2 links to each other with another input of first adder 5, and the output of first adder 5 is reference current i
Ref
Described DC/DC contactor management and control signal generating circuit 4 processed is made of the 3rd comparator C omp3, and the reverse input end of described the 3rd comparator C omp3 connects the output of compensating network 3, and the in-phase input end of the 3rd comparator C omp3 is used for connecting sawtooth signal v
Saw2, the 3rd comparator C omp3 output DC/DC contactor management and control signal processed.
Described comparing cell 2 is made of the first subtracter 6, wherein the positive input termination reference current i of subtracter
Ref, the negative input termination flows through the current i of load
LED, the output of subtracter connects the input of compensating network 3.
A kind of light-dimming method of LED high voltage direct current central power supply system by regulating the output voltage values of dc power supply module B, is realized the unified light modulation of a plurality of loads; By regulating the sawtooth signal v in each current regulating module
Saw1, realize the independent dimming of each LED load.
By regulating the amplifying parameters of the first amplifier K1 and the second amplifier K2, make the reference current i of first adder output
RefA kind of in steady state value waveform, PWM waveform or the many level waveform.
In the above-mentioned reference current circuit for generating, resistance R 1 and R2 consist of voltage sampling circuit, behind the output voltage of sampling dc power supply module with sawtooth signal v
Saw1Compare by the first comparator and the second comparator, the first comparator output high level, the second comparator output low level, with high and low level respectively after the first amplifier and the second amplifier amplify addition can obtain reference current i
RefIf the multiplication factor of high-low level is equal, then reference current i
RefBe steady state value; If the multiplication factor of high-low level is unequal, and the low level multiplication factor is zero, then reference current i
RefBe the PWM waveform; If the multiplication factor of high-low level is unequal, and the low level multiplication factor is non-vanishing, then reference current i
RefBe two level waveforms.All under the non-vanishing condition, keep sawtooth signal v in multiplication factor
Saw1Constant, the output voltage of regulating the dc power supply module can change reference current i
RefDuty ratio, thereby change its mean value, change the current average that flows through the LED load in the one-period with this, LED brightness is unified in the realization system regulates; Keep the output voltage of dc power supply module constant, regulate separately sawtooth signal v in certain current regulating module by power management module
Saw1Peak value or frequency, can change reference current i in this module
RefDuty ratio, thereby change its mean value, change current average in the LED load of flowing through this module in the one-period with this, LED brightness is regulated separately in the realization system.
Connecting circuit as shown in Figure 3, has two current regulating module among the figure as described in Example 1, and described two power adjustment modules are connected with load D1 and load D2 respectively, and the high level multiplication factor is 2, and the low level multiplication factor is 1.5.Be depicted as the current waveform figure that flows through in the different loads before the light modulation such as Fig. 4 (a) and (b), when unifying light modulation, the current waveform that flows through in all LED loads is shown in Fig. 5 (a) and (b); When carrying out independent light modulation, the current waveform that flows through in the different LED load is shown in Fig. 6 (a) and (b).
The present invention is by regulating dc power supply module output voltage or regulating sawtooth signal v
Saw1Peak value or cycle, change the mean value of reference current, change the current average that flows through the LED load in the one-period with this, realize the LED brightness regulation.
Above-described embodiment is the better execution mode of the present invention; but embodiments of the present invention are not limited by the examples; other any do not deviate from change, the modification done under Spirit Essence of the present invention and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (9)
1. the light modulating device of a LED high voltage direct current central power supply system is characterized in that, comprises power management module (A), dc power supply module (B) and N current regulating module (C
1, C
2... C
N), described N 〉=1;
The power module control signal output of described power management module (A) is connected with the control signal receiving terminal of dc power supply module (B), the sawtooth signal v of the positive output end of described dc power supply module (B) and power management module (A)
Saw1Output respectively with N current regulating module (C
1, C
2... C
N) input connect, the negative output terminal ground connection of described dc power supply module (B), the output of described each current regulating module is connected with load.
2. the light modulating device of a kind of LED high voltage direct current central power supply system according to claim 1 is characterized in that, the structure of a described N current regulating module is all identical.
3. the light modulating device of a kind of LED high voltage direct current central power supply system according to claim 2, it is characterized in that, described current regulating module is made of DC/DC circuit (E) and control circuit (F), and described control circuit (F) is made of reference current circuit for generating (1), comparing cell (2), compensating network (3) and DC/DC contactor management and control signal generating circuit processed (4).
4. the light modulating device of a kind of LED high voltage direct current central power supply system according to claim 3, it is characterized in that described reference current circuit for generating comprises the first resistance (R1), the second resistance (R2), the first comparator (Comp1), the second comparator (Comp2), the first amplifier (K
1), the second amplifier (K
2) and first adder (5);
Wherein, one end of the first resistance (R1) connects the positive output end of dc power supply module (B), and the other end links to each other with an end of the second resistance (R2), the in-phase input end of the first comparator (Comp1) and the inverting input of the second comparator (Comp2) respectively;
The other end ground connection of the second resistance (R2), in-phase input end and the sawtooth signal v of the inverting input of the first comparator (Comp1) and the second comparator (Comp2)
Saw1Link to each other; Sawtooth signal v wherein
Saw1(A) provides by power management module;
The output of the first comparator (Comp1) and the first amplifier (K
1) input link to each other the output of the second comparator (Comp2) and the second amplifier (K
2) input link to each other the first amplifier (K
1) output link to each other the second amplifier (K with an input of first adder (5)
2) output link to each other with another input of first adder (5), the output of first adder (5) is reference current i
Ref
5. the light modulating device of a kind of LED high voltage direct current central power supply system according to claim 3 is characterized in that, described comparing cell (2) is made of the first subtracter (6), wherein the positive input termination reference current i of the first subtracter (6)
Ref, the negative input termination flows through the current i of load
LED, the output of the first subtracter (6) connects the input of compensating network (3).
6. the light modulating device of a kind of LED high voltage direct current central power supply system according to claim 2, it is characterized in that, described DC/DC contactor management and control signal generating circuit processed (4) is made of the 3rd comparator (Comp3), the reverse input end of described the 3rd comparator (Comp3) connects the output of compensating network (3), and the in-phase input end of the 3rd comparator (Comp3) is used for connecting sawtooth signal v
Saw2, the control signal of the 3rd comparator (Comp3) output DC/DC contactor management and control signal generating circuit processed.
7. the light modulating device of a kind of LED high voltage direct current central power supply system according to claim 1 is characterized in that, described dc power supply module (B) is made of the pfc circuit and the AC/DC rectification circuit that connect successively.
8. application rights requires the light-dimming method of the light modulating device of each described a kind of LED high voltage direct current central power supply system of 1-6, it is characterized in that, by regulating the output voltage values of dc power supply module (B), realizes the unified light modulation of a plurality of loads; By regulating the sawtooth signal v in each current regulating module
Saw1, realize the independent dimming of each LED load.
9. light-dimming method according to claim 7 is characterized in that, in the described current regulating module, by regulating the first amplifier (K
1) and the second amplifier (K
2) multiplication factor, make the reference current i of first adder output
RefA kind of in steady state value waveform, PWM waveform or the many level waveform.
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| CN201310317371.8A CN103369797B (en) | 2013-07-25 | 2013-07-25 | Light adjustment device and method of LED (Light Emitting Diode) high-voltage direct current centralized power supply system |
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Cited By (4)
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| TWI481311B (en) * | 2014-02-24 | 2015-04-11 | Lextar Electronics Corp | Led driver |
| CN106133434A (en) * | 2014-03-27 | 2016-11-16 | 赤多尼科詹纳斯多夫有限公司 | There is the LED module that integrated current controls |
| CN109192145A (en) * | 2018-09-21 | 2019-01-11 | 合肥惠科金扬科技有限公司 | A kind of subregion light adjusting circuit and display device |
| CN111295014A (en) * | 2018-12-07 | 2020-06-16 | 上海航空电器有限公司 | Method for adjusting brightness of light guide plate in aircraft cockpit |
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Cited By (5)
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| CN106133434A (en) * | 2014-03-27 | 2016-11-16 | 赤多尼科詹纳斯多夫有限公司 | There is the LED module that integrated current controls |
| CN109192145A (en) * | 2018-09-21 | 2019-01-11 | 合肥惠科金扬科技有限公司 | A kind of subregion light adjusting circuit and display device |
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