CN204859684U - LED constant current dimming system - Google Patents
LED constant current dimming system Download PDFInfo
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- CN204859684U CN204859684U CN201520583291.1U CN201520583291U CN204859684U CN 204859684 U CN204859684 U CN 204859684U CN 201520583291 U CN201520583291 U CN 201520583291U CN 204859684 U CN204859684 U CN 204859684U
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Abstract
The utility model relates to a power electronics field, especially concretely relates to LED constant current dimming system. Including control circuit, reference circuit, drive circuit. Compared with the prior art, the utility model has the advantages that: control circuit's control input termination receive with control input end assorted control incoming signal, and according to control incoming signal forms control signal output, a reference circuit output reference voltage signal, the drive circuit certificate control signal with the drive of a reference voltage signal formation drive signal LED is luminous. Turn into the drive signal output of linear change with the control signal of the nonlinear variation of input through drive circuit, improve the stability of LED current.
Description
Technical field
The utility model relates to a kind of electric and electronic technical field, is especially specifically related to a kind of LED constant current light adjusting system.
Background technology
White light LEDs is applied to lighting technology, and its useful life improves more than 5 times than existing light source life, fully can solve the mercurous environmental issue of fluorescent tube, therefore LED is free of contamination eco-friendly power source.Due to the voltage-current characteristic of LED, present White-light LED illumination generally uses continuous current to drive, in order to play the power saving advantages of LED illumination better, in LED power, add dimming function is trend of the times, the mode of existing LED light modulation has two kinds: PWM light modulation and simulation light modulation, switching circuit works in and switches to realize light modulation object relative between sufficiently high frequency eye recognition power by PWM light modulation, the i.e. cycle of PWM light modulation by adjustment control signal and the mean value of duty ratio change light output, but adopt PWM dimming mode, in use can introduce potential electromagnetic interference frequency, and then produce noise jamming and radiated interference, generally for reduction electromagnetic interference, dimming scope must be reduced, thus this kind of method is not suitable for the higher occasion of frequency.Simulation light modulation is the amplitude changing electric power outputting current, change the light output of LED, usually a series connection current sampling resistor on LED, the employing voltage that sample rate current mates is selected by compromise low energy consumption loss and high s/n ratio, but in low-frequency field group photo light field closes, have permissible error, skew and time delay in sample circuit and result in a relatively-stationary error, and then cause the accuracy rate of sample rate current lower, make illumination unstable.
Utility model content
For the difference of prior art, impracticablely novelly provide a kind of applied range, and the light adjusting system of outputting current steadily.
A kind of LED constant current light adjusting system, wherein: comprise
Control circuit, comprises a plurality of control input end, and each described control input end in order to receive the control inputs signal matched with described control input end, and forms a control signal output according to described control inputs signal; Wherein, described control input end comprises voltage input end and/or pulse signal input terminal and/or resistance signal input;
Reference circuit, in order to export a reference voltage signal,
Drive circuit, input connects described control input end and described reference circuit respectively, output connects a LED circuit, drives described LED circuit in order to form a drive singal according to described control signal and described reference voltage signal, and described LED circuit is luminous under described drive singal effect.
Above-mentioned LED constant current light adjusting system, wherein, described control input end comprises voltage input end, and described voltage input end receives a voltage control signal, and forms described control signal according to described voltage control signal.
Above-mentioned LED constant current light adjusting system, wherein, described control input end comprises pulse signal input terminal, and described pulse signal input terminal in order to receive a pwm control signal, and forms described control signal according to described pwm control signal.
Above-mentioned LED constant current light adjusting system, wherein, described control input end comprises resistance signal input, and described resistance signal input in order to receive a resistance control signal, and forms described control signal according to described resistance control signal.
Above-mentioned LED constant current light adjusting system, wherein, described drive circuit is formed by amplifier, and the positive terminal of described amplifier connects described reference circuit, and the end of oppisite phase of described amplifier connects described control circuit.
Above-mentioned LED constant current light adjusting system, wherein, is connected with divider resistance branch road between the end of oppisite phase and ground of described amplifier, a diode in parallel in described divider resistance branch road two ends.
Above-mentioned LED constant current light adjusting system, wherein, also comprise a unidirectional protection diode, described unidirectional protection diode forward is connected between described drive circuit and described LED circuit.
Above-mentioned LED constant current light adjusting system, wherein, also comprises filter circuit, is connected between described drive circuit and described LED circuit.
Above-mentioned LED constant current light adjusting system, wherein, described filter circuit is formed primarily of filter resistance and filter capacitor;
Wherein one end of filter resistance connects described drive circuit, the other end of described filter resistance connects one end of described filter capacitor, the other end ground connection of described filter capacitor, the tie point of described filter resistance and described filter capacitor forms the output of described filter circuit.
Above-mentioned LED constant current light adjusting system, wherein, described filter circuit is formed primarily of the first filter branch and the series connection of the second filter branch.
Compared with prior art, the utility model has the advantages that:
The control input end of control circuit receives the control inputs signal matched with described control input end, and forms a control signal output according to described control inputs signal; Reference circuit exports a reference voltage signal, and drive circuit forms a drive singal according to described control signal and described reference voltage signal and drives described LED luminous.The drive singal that the control signal of the nonlinear change of input is converted into linear change by drive circuit is exported, improve the stability of LED circuit electric current, described control input end comprises voltage input end and/or pulse signal input terminal and/or resistance signal input in addition, adopt three-in-one dimming mode, voltage signal dimming mode can be adopted respectively, or resistance signal dimming mode or pulse signal dimming mode, occasion that can be different selects best regulative mode.
Accompanying drawing explanation
Fig. 1 is electrical block diagram of the present utility model;
Fig. 2 is the structural representation of a kind of embodiment of the present utility model;
Fig. 3 is the structural representation of a kind of embodiment of the present utility model;
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but not as restriction of the present utility model.
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, the every other embodiment that those of ordinary skill in the art obtain under the prerequisite of not making creative work, all belongs to the scope of the utility model protection.
It should be noted that, when not conflicting, the embodiment in the utility model and the feature in embodiment can combine mutually.
Below in conjunction with the drawings and specific embodiments, the utility model is described in further detail, but not as restriction of the present utility model.
As described in Figure 1, a kind of LED constant current light adjusting system, wherein: comprise
Control circuit 1, comprises a plurality of control input end, and each described control input end in order to receive the control inputs signal matched with described control input end, and forms a control signal output according to described control inputs signal; Wherein, described control input end comprises voltage input end 11 and/or pulse signal input terminal 13 and/or resistance signal input 12; Further, a switching device shifter can also be comprised, in order to switch different control inputs signals.
Reference circuit 2, in order to export a reference voltage signal, as further preferred implementation, the amplitude of reference voltage signal can be 0.1V.
Drive circuit 3, input connects described control input end and described reference circuit 2 respectively, and output connects a LED circuit 4, drives described LED luminous in order to form a drive singal according to described control signal and described reference voltage signal.
Further illustrate, the ground in the utility model is only with reference to ground.
Operation principle of the present utility model is: the control input end of control circuit 1 receives the control inputs signal matched with described control input end, and forms a control signal output according to described control inputs signal; Reference circuit 2 is in order to export a reference voltage signal, and drive circuit 3 forms a drive singal according to described control signal and described reference voltage signal and drives described LED luminous.The drive singal that the control signal of the nonlinear change of input is converted into linear change by drive circuit 3 is exported, realize the technical purpose of LED constant current light modulation, improve the stability of LED circuit electric current, described control input end comprises voltage input end 11 and/or pulse signal input terminal 13 and/or resistance signal input 12 in addition, adopt three-in-one dimming mode, voltage signal dimming mode can be adopted respectively, or resistance signal dimming mode or pulse signal dimming mode, occasion that can be different selects best regulative mode.
As further preferred implementation, above-mentioned LED constant current light adjusting system, wherein, described control input end comprises voltage input end 11, described voltage input end 11 in order to receive a voltage control signal, and forms described control signal according to described voltage control signal.The voltage magnitude of described voltage control signal, between 0 ~ 10V, regulates the luminous intensity of LED by inputting different voltage magnitudes.
As further preferred implementation, above-mentioned LED constant current light adjusting system, wherein, described control input end comprises pulse signal input terminal 13, described pulse signal input terminal 13 in order to receive a pwm control signal, and forms described control signal according to described pwm control signal.The mean value of drive circuit 3 output is changed by the cycle and duty ratio regulating pwm control signal, and then the intensity regulating LED light to export.
As further preferred implementation, above-mentioned LED constant current light adjusting system, wherein, described control input end comprises resistance signal input 12, described resistance signal input 12 in order to receive a resistance control signal, and forms described control signal according to described resistance control signal.As shown in Figure 2, resistance control signal Rf is equivalent to feedback resistance, because have feedback resistance, make amplifier operation in the range of linearity (i.e. having empty short, empty disconnected relation between two inputs of amplifier), short according to void, empty disconnected principle, output Uo=(Rf/R3) the * Vref+Vref (voltage on hypothetical reference ground is 0V) of drive circuit 3, when under the state that divider resistance branch road R3 is definite value, the nonlinear change of resistance control signal Rf can be converted into the linear change of the output Uo of drive circuit 3.
As further preferred implementation, above-mentioned LED constant current light adjusting system, wherein, described drive circuit 3 is formed by amplifier, and the positive terminal of described amplifier connects described reference circuit 2, and the end of oppisite phase of described amplifier connects described control circuit 1.The amplifier of the optional model LM358AD of further amplifier.
As further preferred implementation, above-mentioned LED constant current light adjusting system, wherein, divider resistance branch road R3 is connected with between the end of oppisite phase and ground of described amplifier, a diode D1 in parallel in described divider resistance branch road R3 two ends, by changing the resistance of divider resistance branch road R3, the multiplication factor of drive circuit 3 can be changed, be namely equivalent to the driving force changing drive circuit 3.
As further preferred implementation, above-mentioned LED constant current light adjusting system, wherein, also comprises a unidirectional protection diode, and described unidirectional protection diode D2 forward is connected between described drive circuit 3 and described LED circuit 4.Unidirectional protection diode D2 inputs to described drive circuit 3 in order to prevent the electric current of LED circuit 4 from pouring in down a chimney.
As further preferred implementation, above-mentioned LED constant current light adjusting system, wherein, also comprises filter circuit 5, is connected between described drive circuit 3 and described LED circuit 4.Described filter circuit 5 is mainly in order to the voltage ripple of drive circuit described in filtering 3 output.
As further preferred implementation, above-mentioned LED constant current light adjusting system, wherein, described filter circuit 5 is formed primarily of filter resistance and filter capacitor; Wherein one end of filter resistance connects described drive circuit 3, the other end of described filter resistance connects one end of described filter capacitor, the other end ground connection of described filter capacitor, the tie point of described filter resistance and described filter capacitor forms the output of described filter circuit 5.
As shown in Figure 3, as further preferred implementation, above-mentioned LED constant current light adjusting system, wherein, described filter circuit 5 is formed primarily of the first filter branch 51 and the series connection of the second filter branch 52.Wherein the first filter branch 51 is formed primarily of the first resistance R1 and the first electric capacity C1, second filter branch 52 is formed primarily of the second resistance R2 and the second electric capacity C2, one end of described first resistance R1 connects the output of described drive circuit 3, the output of described first resistance R1 connects described first electric capacity C1 one end, the other end ground connection of described first electric capacity C1, the tie point of described first resistance R1 and described first electric capacity C1 forms the output of described first filter branch 51, the output of described first filter branch 51 connects described second resistance R2 one end, the other end of described second resistance R2 connects one end of described second electric capacity C2, the other end ground connection of described second electric capacity C2, the tie point of described second resistance R2 and described second electric capacity C2 forms the output of described filter circuit 5.Adopt the first filter branch 51 and the second filter branch 52, improve the filter effect of ripple further.
The foregoing is only the utility model preferred embodiment; not thereby execution mode of the present utility model and protection range is limited; to those skilled in the art; should recognize and all should be included in the scheme that equivalent replacement done by all utilization the utility model specifications and diagramatic content and apparent change obtain in protection range of the present utility model.
Claims (10)
1. a LED constant current light adjusting system, is characterized in that: comprise
Control circuit, comprises a plurality of control input end, and each described control input end in order to receive the control inputs signal matched with described control input end, and forms a control signal output according to described control inputs signal; Wherein, described control input end comprises voltage input end and/or pulse signal input terminal and/or resistance signal input;
Reference circuit, in order to export a reference voltage signal,
Drive circuit, input connects described control input end and described reference circuit respectively, output connects a LED circuit, drives described LED circuit in order to form a drive singal according to described control signal and described reference voltage signal, and described LED circuit is luminous under described drive singal effect.
2. LED constant current light adjusting system according to claim 1, is characterized in that, described control input end comprises voltage input end, and described voltage input end receives a voltage control signal, and forms described control signal according to described voltage control signal.
3. LED constant current light adjusting system according to claim 1, it is characterized in that, described control input end comprises pulse signal input terminal, and described pulse signal input terminal in order to receive a pwm control signal, and forms described control signal according to described pwm control signal.
4. LED constant current light adjusting system according to claim 1, it is characterized in that, described control input end comprises resistance signal input, and described resistance signal input in order to receive a resistance control signal, and forms described control signal according to described resistance control signal.
5. LED constant current light adjusting system according to claim 1, is characterized in that, described drive circuit is formed by amplifier, and the positive terminal of described amplifier connects described reference circuit, and the end of oppisite phase of described amplifier connects described control circuit.
6. LED constant current light adjusting system according to claim 5, is characterized in that, between the end of oppisite phase and ground of described amplifier, be connected with divider resistance branch road, a diode in parallel in described divider resistance branch road two ends.
7. LED constant current light adjusting system according to claim 1, is characterized in that, also comprises a unidirectional protection diode, and described unidirectional protection diode forward is connected between described drive circuit and described LED circuit.
8. LED constant current light adjusting system according to claim 1, is characterized in that, also comprise filter circuit, is connected between described drive circuit and described LED circuit.
9. LED constant current light adjusting system according to claim 8, is characterized in that, described filter circuit is formed primarily of filter resistance and filter capacitor;
Wherein one end of filter resistance connects described drive circuit, the other end of described filter resistance connects one end of described filter capacitor, the other end ground connection of described filter capacitor, the tie point of described filter resistance and described filter capacitor forms the output of described filter circuit.
10. LED constant current light adjusting system according to claim 8, is characterized in that, described filter circuit is formed primarily of the first filter branch and the series connection of the second filter branch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520583291.1U CN204859684U (en) | 2015-08-05 | 2015-08-05 | LED constant current dimming system |
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| CN201520583291.1U CN204859684U (en) | 2015-08-05 | 2015-08-05 | LED constant current dimming system |
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| CN204859684U true CN204859684U (en) | 2015-12-09 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110049596A (en) * | 2019-04-28 | 2019-07-23 | 西安拓尔微电子有限责任公司 | A kind of pulse input detection circuit for white light LEDs light modulation |
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2015
- 2015-08-05 CN CN201520583291.1U patent/CN204859684U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110049596A (en) * | 2019-04-28 | 2019-07-23 | 西安拓尔微电子有限责任公司 | A kind of pulse input detection circuit for white light LEDs light modulation |
| CN110049596B (en) * | 2019-04-28 | 2024-02-20 | 拓尔微电子股份有限公司 | Pulse input detection circuit for white light LED dimming |
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Address after: No. 122315000 Jianlan Road, Gaoxin District, Ningbo, Zhejiang Patentee after: Ningbo sainaibi Photoelectric Technology Co.,Ltd. Address before: 315040 No. 56 Keda Road, high tech Zone, Ningbo, Zhejiang Patentee before: NINGBO SNAPPY OPTOELECTRONICS Co.,Ltd. |