CN103369797B - 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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- CN103369797B CN103369797B CN201310317371.8A CN201310317371A CN103369797B CN 103369797 B CN103369797 B CN 103369797B CN 201310317371 A CN201310317371 A CN 201310317371A CN 103369797 B CN103369797 B CN 103369797B
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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 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 illumination industry, the application of LED illumination is more and more extensive, and LED street lamp illumination is exactly one of them important applied field, and LED centrally connected power supply technology is a kind of technology being applicable to very much field of street lamp lighting.Although field of street lamp lighting requires enough brightness, but suitably reduce brightness in the time period that people is few, brightness is improved in the time period that people is many, both can ensure that brightness satisfied the demands, energy-conservation effect can be played again, in LED street lamp illuminator, add dimming function, above object can be realized.
For LED high-voltage direct current central power supply system, need, according to different needs, to select different dimming modes, this just requires that system can realize unified light modulation, again can to the independent light modulation of each load.But 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
In order to overcome the shortcoming of prior art existence with not enough, 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 light modulating device for LED high-voltage direct current central power supply system, comprises power management module A, DC power supply module B and N number of 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 number of 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 described N number of current regulating module is all identical, but the design parameter in structure can not be identical.
Described current regulating module is made up of DC/DC circuit E and control circuit F, and described control circuit F is made up of reference current circuit for generating 1, comparing cell 2, compensating network 3 and DC/DC contactor management and control signal generating circuit 4.
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
2with 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 is connected with the inverting input of one end of the second resistance R2, the in-phase input end of the first comparator Comp1 and the second comparator Comp2 respectively;
The other end ground connection of the second resistance R2, the inverting input of the first comparator Comp1 and the in-phase input end of the second comparator Comp2 and sawtooth signal v
saw1be connected; Wherein sawtooth signal v
saw1thered is provided by power management module A;
The output of the first comparator Comp1 and the first amplifier K
1input be connected, the output of the second comparator Comp2 and the second amplifier K
2input be connected, the first amplifier K
1output be connected with an input of first adder 5, the second amplifier K
2output be connected with another input of first adder 5, the output of first adder 5 is reference current i
ref.
Described comparing cell 2 is made up of the first subtracter 6, wherein the positive input termination reference current i of the first subtracter 6
ref, 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 is made up of the 3rd comparator Comp3, and the reverse input end of described 3rd comparator Comp3 connects the output of compensating network 3, and the in-phase input end of the 3rd comparator Comp3 is for connecting sawtooth signal v
saw2, the 3rd comparator Comp3 exports DC/DC contactor pipe control signal, described sawtooth signal v
saw2sent by Saw-tooth Signal Waveform Generator.
Described DC power supply module B is made up of the pfc circuit connected successively and AC/DC rectification circuit.
A light-dimming method for the 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, realizes the unified light modulation of multiple load; By regulating the sawtooth signal v in each current regulating module
saw1, realize the independent dimming of each LED load.
In described current regulating module, by regulating the first amplifier K
1with the second amplifier K
2multiplication factor, the reference current i that first adder is exported
reffor the one in steady state value waveform, PWM waveform or many level waveforms.
Compared with prior art, the present invention has following effect:
The present invention both by regulating the output voltage values of DC power supply module, can realize the unified light modulation of whole system; Again can by regulating separately the sawtooth signal v in each current regulating module
saw1, realize the independent dimming of each LED load;
Structure of the present invention is simple, convenient, the stable and no color differnece change in dimming process of light modulation;
When adopting many level Driving technique, improve the luminous efficiency of LED, ensure that the long-life of LED load.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structure chart of reference current circuit for generating in Fig. 1;
Fig. 3 is the circuit structure diagram of the embodiment of the present invention 2;
The current waveform figure of Fig. 4 (a)-Fig. 4 (b) for flowing through in load before the embodiment of the present invention 2 light modulation, the wherein current waveform figure of Fig. 4 (a) for flowing through before load D1 light modulation, the current waveform figure of Fig. 4 (b) for flowing through before load D2 light modulation;
The current waveform figure of Fig. 5 (a)-Fig. 5 (b) for flowing through in load during embodiment of the present invention realization unification light modulation, the wherein current waveform figure of Fig. 5 (a) for flowing through during load D1 light modulation, the current waveform figure of Fig. 5 (b) for flowing through during load D2 light modulation;
The current waveform figure of Fig. 6 (a)-Fig. 6 (b) for respectively flowing through in different loads when the embodiment of the present invention realizes independent light modulation, the current waveform figure wherein flow through during Fig. 6 (a) light modulation independent for load D1, the current waveform figure flow through during Fig. 6 (b) light modulation independent for 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 thereto.
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, N number of current regulating module C
1, C
2... C
nand N number of 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 number of 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 up of the pfc circuit connected successively and AC/DC rectification circuit.
Described N number of current regulating module C
1, C
2... C
nstructure all identical, but the component parameters inside disparate modules can not be identical.
Described current regulating module is made up of DC/DC circuit E and control circuit F, and described control circuit F is made up of reference current circuit for generating 1, comparing cell 2, compensating network 3 and DC/DC contactor management and control signal generating circuit 4.
As shown in Figure 2, 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 K1, the second amplifier K2 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 is connected with the inverting input of one end of the second resistance R2, the in-phase input end of the first comparator Comp1 and the second comparator Comp2 respectively;
The other end ground connection of the second resistance R2, the inverting input of the first comparator Comp1 and the in-phase input end of the second comparator Comp2 and sawtooth signal v
saw1be connected; Wherein sawtooth signal v
saw1thered is provided by power management module, use as control signal;
The output of the first comparator Comp1 is connected with the input of the first amplifier K1, the output of the second comparator Comp2 is connected with the input of the second amplifier K2, the output of the first amplifier K1 is connected with an input of first adder 5, the output of the second amplifier K2 is connected 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 is made up of the 3rd comparator Comp3, and the reverse input end of described 3rd comparator Comp3 connects the output of compensating network 3, and the in-phase input end of the 3rd comparator Comp3 is for connecting sawtooth signal v
saw2, the 3rd comparator Comp3 exports DC/DC contactor pipe control signal.
Described comparing cell 2 is made up of the first subtracter 6, wherein the positive input termination reference current i of subtracter
ref, negative input termination flows through the current i of load
lED, the output of subtracter connects the input of compensating network 3.
A light-dimming method for LED high-voltage direct current central power supply system, by regulating the output voltage values of DC power supply module B, realizes the unified light modulation of multiple load; 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, the reference current i that first adder is exported
reffor the one in steady state value waveform, PWM waveform or many level waveforms.
In above-mentioned reference current circuit for generating, resistance R1 and R2 forms voltage sampling circuit, with sawtooth signal v after the output voltage of sampling DC power supply module
saw1compared by the first comparator and the second comparator, the first comparator exports high level, the second comparator output low level, is added respectively by high and low level and can obtains reference current i after the first amplifier and the second amplifier amplify
ref.If the multiplication factor of low and high level is equal, then reference current i
reffor steady state value; If the multiplication factor of low and high level is unequal, and low level multiplication factor is zero, then reference current i
reffor PWM waveform; If the multiplication factor of low and high level is unequal, and low level multiplication factor is non-vanishing, then reference current i
refbe two level waveforms.Under the condition that multiplication factor is all non-vanishing, keep sawtooth signal v
saw1constant, regulate the output voltage of DC power supply module can change reference current i
refduty ratio, thus change its mean value, change in one-period with this current average flowing through LED load, realize that LED luminance in system is unified to be regulated; Keep the output voltage of DC power supply module constant, regulate separately the sawtooth signal v in certain current regulating module by power management module
saw1peak value or frequency, reference current i in this module can be changed
refduty ratio, thus change its mean value, change in one-period with this current average flow through in the LED load of this module, realize LED luminance in system and regulate separately.
Embodiment 2
Connecting circuit as described in Example 1, as shown in Figure 3, has two current regulating module in figure, described two power adjustment modules are connected with load D1 and load D2 respectively, and high level multiplication factor is 2, and low level multiplication factor is 1.5.As Fig. 4 (a)-Fig. 4 (b) be depicted as light modulation before the current waveform figure that flows through in different loads, when carrying out unifying light modulation, the current waveform flow through in all LED load is as shown in Fig. 5 (a)-Fig. 5 (b); When carrying out independent light modulation, the current waveform flow through in different LED load is as shown in Fig. 6 (a)-Fig. 6 (b).
The present invention is by regulating DC power supply module output voltage or regulating sawtooth signal v
saw1peak value or the cycle, change the mean value of reference current, change in one-period with this current average flowing through LED load, realize LED luminance and regulate.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not limited by the examples; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included within protection scope of the present invention.
Claims (7)
1. a light modulating device for 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 number of 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 number of 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;
Described current regulating module is made up of DC/DC circuit (E) and control circuit (F), and described control circuit (F) is made up of reference current circuit for generating (1), comparing cell (2), compensating network (3) and DC/DC contactor management and control signal generating circuit (4);
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 first resistance (R1) connects the positive output end of DC power supply module (B), and the other end is connected with the inverting input of one end of the second resistance (R2), the in-phase input end of the first comparator (Comp1) and the second comparator (Comp2) respectively;
The other end ground connection of the second resistance (R2), the inverting input of the first comparator (Comp1) and the in-phase input end of the second comparator (Comp2) and sawtooth signal v
saw1be connected; Wherein sawtooth signal v
saw1thered is provided by power management module (A);
The output of the first comparator (Comp1) and the first amplifier (K
1) input be connected, the output of the second comparator (Comp2) and the second amplifier (K
2) input be connected, the first amplifier (K
1) output be connected with an input of first adder (5), the second amplifier (K
2) output be connected with another input of first adder (5), the output of first adder (5) is reference current i
ref.
2. the light modulating device of a kind of LED high-voltage direct current central power supply system according to claim 1, it is characterized in that, the structure of described N number of 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 1, it is characterized in that, described comparing cell (2) is made up of the first subtracter (6), wherein the positive input termination reference current i of the first subtracter (6)
ref, 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).
4. the light modulating device of a kind of LED high-voltage direct current central power supply system according to claim 1, it is characterized in that, described DC/DC contactor management and control signal generating circuit (4) is made up of the 3rd comparator (Comp3), the reverse input end of described 3rd comparator (Comp3) connects the output of compensating network (3), and the in-phase input end of the 3rd comparator (Comp3) is for connecting sawtooth signal v
saw2, the 3rd comparator (Comp3) exports the control signal of DC/DC contactor management and control signal generating circuit.
5. 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 up of the pfc circuit connected successively and AC/DC rectification circuit.
6. application rights requires the light-dimming method of the light modulating device of a kind of LED high-voltage direct current central power supply system described in any one of 1-4, it is characterized in that, by regulating the output voltage values of DC power supply module (B), realize the unified light modulation of multiple load; By regulating the sawtooth signal v in each current regulating module
saw1, realize the independent dimming of each LED load.
7. light-dimming method according to claim 6, it is characterized in that, described current regulating module is made up of DC/DC circuit (E) and control circuit (F), and described control circuit (F) is made up of reference current circuit for generating (1), comparing cell (2), compensating network (3) and DC/DC contactor management and control signal generating circuit (4); 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), in described current regulating module, by regulating the first amplifier (K
1) and the second amplifier (K
2) multiplication factor, the reference current i that first adder is exported
reffor the one in steady state value waveform, PWM waveform or many level waveforms.
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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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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI481311B (en) * | 2014-02-24 | 2015-04-11 | Lextar Electronics Corp | Led driver |
| DE102014220656A1 (en) * | 2014-03-27 | 2015-10-01 | Tridonic Gmbh & Co Kg | LED module with integrated current control |
| 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 |
| CN111295014B (en) * | 2018-12-07 | 2023-07-28 | 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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| CN102118905A (en) * | 2010-01-05 | 2011-07-06 | 英飞特电子（杭州）有限公司 | Circuit suitable for multi-path LED current-sharing control |
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