CN102811525A - LED lamp and control circuit thereof - Google Patents
LED lamp and control circuit thereof Download PDFInfo
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- CN102811525A CN102811525A CN201110144026XA CN201110144026A CN102811525A CN 102811525 A CN102811525 A CN 102811525A CN 201110144026X A CN201110144026X A CN 201110144026XA CN 201110144026 A CN201110144026 A CN 201110144026A CN 102811525 A CN102811525 A CN 102811525A
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Abstract
The invention discloses an LED lamp and a control circuit thereof. The control circuit comprises a photosensitive resistor, a light adjusting potentiometer and a control module, wherein the photosensitive resistor and the light adjusting potentiometer are connected in series between a power supply input end and a grounding end; the adjustable end of the light adjusting potentiometer is connected with the first input end of the control module; the control module is used for processing and analyzing a voltage signal received by the first input end and driving an LED light source to emit light with corresponding luminance; in the control module, a light adjusting gear setting unit receives a first voltage signal input by the first input end due to the change of the light adjusting potentiometer, and chooses the corresponding duty ratio of a PWM modulation wave; a luminance sensing adjusting unit receives a second voltage signal input by the first input end due to the change of the photosensitive resistor, and chooses the corresponding duty ratio of the PWM modulation wave; and a control signal generating unit generates the PWM modulation wave according to the duty ratio chosen by the light adjusting gear setting unit or the luminance sensing adjusting unit. According to the technical scheme provided by the embodiment of the invention, the LED lamp can automatically adjust the light with the change of the environment luminance.
Description
Technical field
The present invention relates to the LED luminescence technology, relate in particular to a kind of LED light fixture and control circuit thereof.
Background technology
Along with the continuous development of science and technology, the new product new technology is constantly reformed, and LED is as new type light source, and it has energy-saving and environmental protection, characteristics of high efficiency, and technology is ripe and be applied to every field, and LED is widely used as light source.Yet existing LED light fixture can only remain on the brightness constancy output that the user is provided with, can not be with an automatic light meter with the variation of ambient brightness, be unfavorable for energy-conserving and environment-protective like this, and the user uses also uncomfortable.
Summary of the invention
The technical problem that the present invention will solve is, to the brightness of the above-mentioned LED light fixture of prior art defective can not be with the variation of ambient brightness with an automatic light meter, a kind of control circuit of LED light fixture is provided, can be with an automatic light meter along with the variation of ambient brightness.
The technical solution adopted for the present invention to solve the technical problems is: construct a kind of control circuit of LED light fixture, link to each other with led light source, this control circuit comprises:
Be series at photo resistance and light adjusting potentiometer between power supply input and the ground end, and the first input end of the adjustable end link control module of light adjusting potentiometer;
Be used for the voltage signal that said first input end receives is carried out the control module of Treatment Analysis;
Be connected in the driver module of led light source, be used for PWM modulating wave, drive the light that said led light source sends corresponding bright according to said control module output;
Said control module comprises that the light modulation gear is provided with unit, brightness impression regulon and control signal generation unit; Said light modulation gear is provided with the unit and receives first voltage signal that said first input end is imported because of said light adjusting potentiometer variation, selects the duty ratio with the corresponding PWM modulating wave of said first voltage signal; Said brightness impression regulon receives said first input end and changes second voltage signal of importing because of said photo resistance, selects the duty ratio with the corresponding PWM modulating wave of said second voltage signal; Said control signal generation unit is provided with the duty ratio that unit or said brightness impression regulon are selected according to said light modulation gear, generates the PWM modulating wave.
In the control circuit of LED light fixture of the present invention, said control circuit also comprises:
Sampling module is used for the current supply circuit of said led light source is carried out current sample, and converts the corresponding feedback voltage signal to, more said feedback voltage signal is transferred to the said control signal generation unit of said control module;
Said control signal generation unit is according to said feedback voltage signal, and the PWM modulating wave of regulating output makes it on the PWM modulating wave duty ratio of selecting.
In the control circuit of LED light fixture of the present invention, said control circuit also comprises:
Switch module is used to receive the switching signal that the user imports, and said switching signal is transferred to the said control signal generation unit of control module.
In the control circuit of LED light fixture of the present invention; Said driver module comprises that triode Q1, model are the first constant current chip, the current-limiting resistance R2 of 7135D; Wherein, the output of control module is through the base stage of current-limiting resistance R2 connection triode Q1, and the emitter of triode Q1 connects said sampling module; The collector electrode of triode Q1 connects the earth terminal of the said first constant current chip; The power end of the said first constant current chip connects the positive output end of power supply, the negative pole of the output termination led light source of the said first constant current chip, and the positive pole of led light source connects the positive output end of power supply.
In the control circuit of LED light fixture of the present invention, said sampling module is sampling resistor R3, and the end of said sampling resistor R3 connects the emitter of said triode Q1 and second input of control module, the other end ground connection of said sampling resistor R3.
In the control circuit of LED light fixture of the present invention; Said driver module comprises that triode Q2, model are the second constant current chip, current-limiting resistance R6, feedback sample resistance R 3 and the feedback sample resistance R 4 of LM317; Wherein, The input of the second constant current chip connects the positive output end of power supply, and the output of the second constant current chip connects the positive pole of led light source, and the negative pole of led light source is through sampling module ground connection; The output of control module connects the base stage of triode Q2 through current-limiting resistance R6; The grounded emitter of triode Q2, the collector electrode of triode Q2 the feedback sample resistance R 4 through series connection and feedback sample resistance R 3 successively connect the output of the second constant current chip, and the tie point of feedback sample resistance R 3 and feedback sample resistance R 4 connects the adjustable side of the second constant current chip.
In the control circuit of LED light fixture of the present invention, said sampling module comprises sampling resistor R5, and the end of sampling resistor R5 connects the negative pole of led light source and second input of control module, the other end ground connection of sampling resistor R5.
In the control circuit of LED light fixture of the present invention, said switch module comprises pull-up resistor R1 and button, and pull-up resistor R1 and button are connected between two outputs of power supply, and the tie point of pull-up resistor R1 and button connects the 3rd input of control module.
The present invention also constructs a kind of LED light fixture, comprises led light source, and this LED light fixture also comprises the control circuit of above-described LED light fixture.
The technical scheme of embodiment of the present invention; After start; The user is provided with corresponding gear through light adjusting potentiometer; The change in voltage of the first input end of control module, light modulation gear are provided with the unit according to the corresponding duty ratio of this voltage signal through control signal generation unit selection PWM modulating wave, and this PWM modulating wave sends the light of corresponding bright through driver module driving LED light source.Subsequently, along with the variation of surrounding environment brightness, the resistance of photo resistance changes; The voltage of the first input end of control module also correspondingly changes, and the brightness impression regulon is selected the duty ratio of corresponding PWM modulating wave according to the variation of this voltage signal through the control signal generation unit; Thereby can realize that the LED light fixture is with an automatic light meter along with the variation of ambient brightness; For example, when environment brightens, the luminous of led light source died down; When the environment deepening, make the luminous grow of led light source.
Description of drawings
To combine accompanying drawing and embodiment that the present invention is described further below, in the accompanying drawing:
Fig. 1 is the building-block of logic of the control circuit embodiment one of LED light fixture of the present invention;
Fig. 2 is the building-block of logic of the control circuit embodiment two of LED light fixture of the present invention;
Fig. 3 is the circuit diagram of the control circuit embodiment one of LED light fixture of the present invention;
Fig. 4 is the circuit diagram of the control circuit embodiment two of LED light fixture of the present invention.
Embodiment
As shown in Figure 1, in the building-block of logic of the control circuit embodiment one of LED light fixture of the present invention, the control circuit of this LED light fixture comprises:
Be series at photo resistance RG1 and light adjusting potentiometer W1 between power supply input and the ground end, and the first input end of the adjustable end link control module 200 of light adjusting potentiometer W1;
Be used for the voltage signal that said first input end receives is carried out the control module 200 of Treatment Analysis;
Be connected in the driver module 300 of led light source, be used for the PWM modulating wave according to control module 200 outputs, the driving LED light source sends the light of corresponding bright;
Implement this technical scheme; At first after start, the user is provided with corresponding gear through light adjusting potentiometer W1, the change in voltage of the first input end of control module 200; The light modulation gear is provided with unit 201 and selects the corresponding duty ratio of PWM modulating wave according to this voltage signal; Control signal generation unit 203 generates the PWM modulating wave according to selected duty ratio, and this PWM modulating wave sends the light of corresponding bright through driver module 300 driving LED light sources.Subsequently, along with the variation of surrounding environment brightness, the resistance of photo resistance RG1 changes; The voltage of the first input end of control module 200 also correspondingly changes; Brightness impression regulon 202 is selected the duty ratio of corresponding PWM modulating wave according to the variation of this voltage signal, and control signal generation unit 203 is according to selected duty ratio; Generate the PWM modulating wave, this PWM modulating wave sends the light of corresponding bright through driver module 300 driving LED light sources.Like this, can when environment brightens, the luminous of led light source be died down; When the environment deepening, make the luminous grow of led light source, thereby realize that the LED light fixture is with an automatic light meter along with the variation of ambient brightness.
Fig. 2 is the building-block of logic of the control circuit embodiment two of LED light fixture of the present invention; This embodiment compares embodiment shown in Figure 1; It is identical that the photo resistance RG1 that is wherein comprised, light adjusting potentiometer W1, light modulation gear are provided with unit 201, brightness impression regulon 202 and driver module 300; Do not do at this and to give unnecessary details, below different portions only is described.The control circuit of this embodiment also comprises: be connected the sampling module 400 between led light source and the control module 200, and the switch module 500 that is connected with control module 200.Wherein, Sampling module 400 is used for the current supply circuit of said led light source is carried out current sample; And convert the corresponding feedback voltage signal to, more said feedback voltage signal is transferred to the control signal generation unit 203 of control module 200, then; Control signal generation unit 203 is according to feedback voltage signal, and the PWM modulating wave of regulating output makes it on the PWM modulating wave duty ratio of selecting.Switch module 500 is used to receive the switching signal of user's input, and said switching signal is transferred to the control signal generation unit 203 of control module 200, and control module 200 just can be controlled the Kai Heguan of led light sources according to this switching signal through driver module 300.
As shown in Figure 3, in the circuit diagram of the control circuit embodiment one of LED light fixture of the present invention, the control circuit of this LED light fixture comprises: photo resistance RG1, light adjusting potentiometer W1, control module 200, driver module 300, sampling module 400 and switch module 500.In this embodiment, control module 200 is single-chip microcomputer U1, and promptly the light modulation gear among Fig. 1 and Fig. 2 is provided with unit 201, brightness impression regulon 202 and control signal generation unit 203 and is integrated into single-chip microcomputer U1.Sampling module 400 is sampling resistor R3.Photo resistance RG1 and light adjusting potentiometer W1 are connected between two outputs of power supply BT1, and the adjustable end of light adjusting potentiometer W1 connects the first input end (PB0) of single-chip microcomputer U1.In driver module 300; The output of single-chip microcomputer U1 (PB3) connects the base stage of triode Q1 through current-limiting resistance R2; The emitter of triode Q1 is through sampling resistor R3 ground connection; The emitter of triode Q1 also connects second input (PB4) of single-chip microcomputer U1, and the collector electrode of triode Q1 connects the earth terminal that model is the first constant current chip U2 of KXL7135 series (for example 7135D), and the power end of the first constant current chip U2 connects the positive output end of power supply BT1; The negative pole of the output termination led light source LED1 of the first constant current chip U2, the positive pole of led light source LED1 connects the positive output end of power supply BT1.In switch module 500, pull-up resistor R1 and button K1 are connected between two outputs of power supply BT1, and the tie point of pull-up resistor R1 and button K1 connects the 3rd input (PB1) of single-chip microcomputer U1.
The operation principle of this control circuit is described below:
At first, the user K1 that pushes button, when single-chip microcomputer U1 detects its 3rd input (PB1) when jumping to low level by high level, then this LED light fixture is started working.Then; The user is provided with the gear of needs through light adjusting potentiometer W1; Single-chip microcomputer U1 carries out the AD sampling to its first input end (PB0); And export the PWM modulating wave of corresponding duty ratio according to this AD sampled value, driver module 300 sends the light of corresponding bright according to this PWM modulating wave driving LED light source led 1.This adjustment can be designated as " coarse adjustment ".When carrying out coarse adjustment, can in single-chip microcomputer U1, store an illuminometer in advance, this illuminometer comprises a plurality of gears of light adjusting potentiometer W1, and the duty ratio of the PWM modulating wave corresponding with each gear.
Then, along with the variation of ambient brightness, single-chip microcomputer U1 proceeds the AD sampling to its first input end (PB0); Again its second input (PB4) is carried out the AD sampling; And the AD sampled value of its first input end (PB0) and second input (PB4) compared, if environment brightens, the resistance of photo resistance RG1 reduces; The AD sampled value of the first input end of single-chip microcomputer U1 (PB0) increases; At this moment, single-chip microcomputer U1 can correspondingly adjust the duty ratio of the PWM modulating wave of its output (PB3) output, and the luminous of led light source LED1 died down.Otherwise if the environment deepening, principle is similar with it, does not do at this and gives unnecessary details.Single-chip microcomputer U1 circulation scans the AD sampled value of its first input end (PB0) and second input (PB4) repeatedly like this, reaches the purpose of real-time light modulation and constant current.This adjustment can be designated as " fine tuning ".
In addition, be about what driver module 300 also need be explained, in the high level moment of PWM modulating wave, triode Q1 conducting, the current collection of triode Q1 is low level very, first constant current chip U2 work, led light source LED1 is luminous; In the low level moment of PWM modulating wave; Triode Q1 by, the current collection of triode Q1 is high level very, the first constant current chip U2 does not work; Led light source LED1 is not luminous; So through the duty ratio of adjustment PWM modulating wave, just can change the open and close duration of led light source LED1, also promptly can change the luminosity of led light source LED1.
As shown in Figure 4; In the circuit diagram of the control circuit embodiment two of LED light fixture of the present invention, the control circuit of this LED light fixture comprises: photo resistance RG1, light adjusting potentiometer W1, control module 200, driver module 300 ', sampling module 400 ' and switch module 500.Wherein, photo resistance RG1, light adjusting potentiometer W1, control module 200 and switch module 500 are identical with structure and the operation principle of embodiment one shown in Figure 3, do not do at this and give unnecessary details, below only explain driver module 300 ' with sampling module 400 '.In this embodiment, sampling module 400 ' be sampling resistor R5.Driver module 300 ' in; The input of the second constant current chip U3 connects the positive output end of power supply BT1; The output of the second constant current chip U3 connects the positive pole of led light source LED1; The negative pole of led light source LED1 is through sampling resistor R5 ground connection; The negative pole of led light source LED1 also connects second input (PB3) of single-chip microcomputer U1, and the output of single-chip microcomputer U1 (PB3) is through the base stage of current-limiting resistance R6 connection triode Q2, the grounded emitter of triode Q2; The collector electrode of the triode Q2 feedback sample resistance R 4 through series connection and feedback sample resistance R 3 successively connects the output of the second constant current chip U3, and the tie point of feedback sample resistance R 3 and feedback sample resistance R 4 is connected the adjustable side of the second constant current chip U3.
Below the explanation this driver module 300 ' operation principle; In the high level moment of PWM modulating wave, triode Q2 conducting, the current collection of triode Q2 is low level very; Second constant current chip U3 work; According to feedback sample resistance R 4 and feedback sample resistance R 4 and feedback sample resistance R 3 and ratio, the output correspondent voltage, led light source LED1 is luminous.In the low level moment of PWM modulating wave; Triode Q2 by, the current collection of triode Q2 is high level very, the second constant current chip U3 does not work; Led light source LED1 is not luminous; So through the duty ratio of adjustment PWM modulating wave, just can change the open and close duration of led light source LED1, also promptly can change the luminosity of led light source LED1.
The present invention also constructs a kind of LED light fixture, comprises the control circuit of led light source and the described LED light fixture of above arbitrary embodiment, does not do at this and gives unnecessary details.
The above is merely the preferred embodiments of the present invention, is not limited to the present invention, and for a person skilled in the art, the present invention can have various changes and variation.All within spirit of the present invention and principle, any modification of being done, be equal to replacement, improvement etc., all should be included within the claim scope of the present invention.
Claims (9)
1. the control circuit of a LED light fixture links to each other with led light source, it is characterized in that, comprising:
Be series at photo resistance (RG1) and light adjusting potentiometer (W1) between power supply input and the ground end, and the first input end of the adjustable end link control module of light adjusting potentiometer (W1);
Be used for the voltage signal that said first input end receives is carried out the control module of Treatment Analysis;
Be connected in the driver module of led light source, be used for PWM modulating wave, drive the light that said led light source sends corresponding bright according to said control module output;
Said control module comprises that the light modulation gear is provided with unit, brightness impression regulon and control signal generation unit; Said light modulation gear is provided with the unit and receives first voltage signal that said first input end is imported because of said light adjusting potentiometer variation, selects the duty ratio with the corresponding PWM modulating wave of said first voltage signal; Said brightness impression regulon receives said first input end and changes second voltage signal of importing because of said photo resistance, selects the duty ratio with the corresponding PWM modulating wave of said second voltage signal; Said control signal generation unit is provided with the duty ratio that unit or said brightness impression regulon are selected according to said light modulation gear, generates the PWM modulating wave.
2. the control circuit of LED light fixture according to claim 1 is characterized in that, said control circuit also comprises:
Sampling module is used for the current supply circuit of said led light source is carried out current sample, and converts the corresponding feedback voltage signal to, more said feedback voltage signal is transferred to the said control signal generation unit of said control module;
Said control signal generation unit is according to said feedback voltage signal, and the PWM modulating wave of regulating output makes it on the PWM modulating wave duty ratio of selecting.
3. the control circuit of LED light fixture according to claim 2 is characterized in that, said control circuit also comprises:
Switch module is used to receive the switching signal that the user imports, and said switching signal is transferred to the said control signal generation unit of control module.
4. according to the control circuit of claim 2 or 3 described LED light fixtures; It is characterized in that said driver module comprises that triode Q1, model are the first constant current chip (U2), the current-limiting resistance R2 of 7135D, wherein; The output of control module connects the base stage of triode Q1 through current-limiting resistance R2; The emitter of triode Q1 connects said sampling module, and the collector electrode of triode Q1 connects the earth terminal of the said first constant current chip (U2), and the power end of the said first constant current chip (U2) connects the positive output end of power supply; The negative pole of the output termination led light source of the said first constant current chip (U2), the positive pole of led light source connects the positive output end of power supply.
5. the control circuit of LED light fixture according to claim 4; It is characterized in that; Said sampling module is sampling resistor R3, and the end of said sampling resistor R3 connects the emitter of said triode Q1 and second input of control module, the other end ground connection of said sampling resistor R3.
6. according to the control circuit of claim 2 or 3 described LED light fixtures; It is characterized in that; Said driver module comprises that triode Q2, model are the second constant current chip (U3), current-limiting resistance R6, feedback sample resistance R 3 and the feedback sample resistance R 4 of LM317; Wherein, The input of the second constant current chip (U3) connects the positive output end of power supply, and the output of the second constant current chip (U3) connects the positive pole of led light source, and the negative pole of led light source is through sampling module ground connection; The output of control module connects the base stage of triode Q2 through current-limiting resistance R6; The grounded emitter of triode Q2, the collector electrode of triode Q2 the feedback sample resistance R 4 through series connection and feedback sample resistance R 3 successively connect the output of the second constant current chip (U3), and the tie point of feedback sample resistance R 3 and feedback sample resistance R 4 connects the adjustable side of the second constant current chip (U3).
7. the control circuit of LED light fixture according to claim 6 is characterized in that, said sampling module comprises sampling resistor R5, and the end of sampling resistor R5 connects the negative pole of led light source and second input of control module, the other end ground connection of sampling resistor R5.
8. the control circuit of LED light fixture according to claim 3; It is characterized in that; Said switch module comprises pull-up resistor R1 and button (K1); Pull-up resistor R1 and button (K1) are connected between two outputs of power supply, and the tie point of pull-up resistor R1 and button (K1) connects the 3rd input of control module.
9. a LED light fixture comprises led light source, it is characterized in that, this LED light fixture also comprises the control circuit of the described LED light fixture of claim 1-8.
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| CN110831290A (en) * | 2019-11-29 | 2020-02-21 | 北京空间技术研制试验中心 | LED lighting driver |
| CN111465137A (en) * | 2020-05-13 | 2020-07-28 | 迅驰车业江苏有限公司 | PID control method for regulating output current of vehicle lamp driving module |
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Application publication date: 20121205 |