CN201623891U - LED illumination automatic dimming circuit - Google Patents
LED illumination automatic dimming circuit Download PDFInfo
- Publication number
- CN201623891U CN201623891U CN2010201019426U CN201020101942U CN201623891U CN 201623891 U CN201623891 U CN 201623891U CN 2010201019426 U CN2010201019426 U CN 2010201019426U CN 201020101942 U CN201020101942 U CN 201020101942U CN 201623891 U CN201623891 U CN 201623891U
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- circuit
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- led
- conversion processing
- illumination
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
Abstract
The utility model relates to an LED illumination automatic dimming circuit, which comprises an LED illumination automatic dimming circuit, an external illumination intensity detection circuit, an A/D conversion processing circuit, an MCU control circuit, a PWM output circuit and a constant-current power supply circuit, wherein the illumination intensity detection circuit is connected with the A/D conversion processing circuit connected with the MCU control circuit, the PWM output circuit is connected with the constant-current power supply circuit, and the illumination intensity detection circuit is connected with the A/D conversion processing circuit. Illumination intensity signals are converted into voltage signals, and the output duty ratio of PWM control signals is adjusted in real time after the MCU processing, thereby changing the constant-current value of the LED constant-current drive circuit, and achieving the purpose of dimming the LED; moreover, the LED illumination automatic dimming circuit can control 2 lines of LED lamp strings at the same time. The utility model has simple structure, convenient use, economy, and reliability.
Description
The utility model relates to the control device of a kind of LED illuminator light modulation, is a kind of LED control circuit with an automatic light meter that throws light on specifically.
Background technology
Advantages such as in recent years, LED illumination is because its luminous efficiency height, and electric weight is low, energy-conservation have obtained using widely.The luminosity of LED illuminating lamp mainly is driven by it the influence of electric current, so the LED type of drive should be that constant-current source drives.At present, various constant-current driving power supplies are of a great variety on the market, but possess the rather rare of controlled function with an automatic light meter, the utility model has designed a kind of LED constant-current drive circuit that can know brightness adjustment control according to the illumination brightness in the external world for this reason, to satisfy the demand in market.
Summary of the invention
The purpose of this utility model is to provide a kind of LED the control circuit with an automatic light meter that throws light on, LED can regulate luminosity automatically according to the difference of environment for use light light and shade, reach rational illuminance, both satisfied the demand of illumination on the one hand, improve the automatization level of device; Another side also can energy savings, can solve the problem that the LED illumination can not be with an automatic light meter.
The technical solution of the utility model is: the LED control circuit with an automatic light meter that throws light on, its input power supply inserts rectification circuit, insert filter circuit after the rectification, filtered circuit one tunnel is powered to constant-current power supply circuit, another road provides constant voltage dc source to control circuit again after filtering after the voltage stabilizing of voltage stabilizing chip, this circuit also comprises the external light intensity testing circuit, the A/D conversion processing circuit, the MCU control circuit, the PWM output circuit, wherein the intensity of illumination testing circuit links to each other with the A/D conversion processing circuit, the A/D conversion processing circuit links to each other with the MCU control circuit, the PWM output circuit links to each other with constant-current power supply circuit, the intensity of illumination testing circuit cooperates with the A/D conversion processing circuit, with the intensity of illumination conversion of signals is voltage signal, after handling, MCU adjusts the output duty cycle of pwm control signal in real time, thereby change the constant current value of LED constant-current drive circuit, reach purpose the LED light modulation.
The described LED control circuit with an automatic light meter that throws light on can be controlled 2 paths of LEDs lamp strings simultaneously respectively.
Compare with existing temperature detection-control technology, the beneficial effects of the utility model are: changed traditional LED brightness adjustment control mode, realized the control with an automatic light meter of LED illumination, improved the automatization level of device, also changed simultaneously the problem that the LED illumination can not be regulated brightness automatically, energy-saving and cost-reducing.The utility model circuit structure is simple, easy to use, economic and reliable.
Description of drawings
Further specify the utility model below in conjunction with the drawings and specific embodiments.
Fig. 1 is the utility model schematic block circuit diagram;
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
The utility model comprises power circuit, A/D conversion processing circuit, MCU control circuit and PWM light modulation constant-current circuit as shown in Figure 1 and Figure 2.Among the figure, input voltage obtains 12V left and right sides direct voltage after rectification, after filter capacitor C1, C2 filtering, the one tunnel directly gives constant-current source chip U3 and U4 power supply, the one tunnel after voltage stabilizing chip U1 voltage stabilizing again behind capacitor C 3, C4 filtering provide 5V constant voltage dc source to control circuit.The A/D conversion processing circuit comprises the two independent treatment circuit; circuit is provided with illumination detecting sensor interface CN1, CN2; through resistance R 1, R4 dividing potential drop, enter the A/D conversion input port of MCU behind C5, C14 filtering and voltage-stabilizing protection pipe D1, the D4, the magnitude of voltage of input has just reflected the difference of illuminance.The illumination detecting sensor can make photo resistance.
The MCU control section, mainly comprise main control MCU chip U2NEC uPD78F9200 and peripheral circuit, peripheral circuit comprises button S1, S2 input circuit and indicator light D5, R3 circuit, and wherein button S1 is the beginning operating key, and S2 is the finishing control key, indicator light indication constant-current circuit operating state, circuit is started working when pushing button S1, and indicator light D5 is bright, when pushing button S2, circuit quits work, and indicator light D5 goes out.When circuit was started working, MCU read the conversion value of two-way A/D in real time, and after the processing of tabling look-up, controlled the duty ratio of two-way pwm signal, thereby changed the size of constant-current source output current, reached the purpose of LED light modulation.Constant-current circuit partly comprises constant-current source control U3, U4 chip SD42511 and peripheral circuit, and lead-out terminal CN3, CN4 can connect two paths of LED lamp string.
Claims (2)
1. LED control circuit with an automatic light meter that throws light on, its input power supply inserts rectification circuit, insert filter circuit after the rectification, filtered circuit one tunnel is powered to constant-current power supply circuit, another road provides constant voltage dc source to control circuit again after filtering after the voltage stabilizing of voltage stabilizing chip, it is characterized in that this circuit also comprises the external light intensity testing circuit, the A/D conversion processing circuit, the MCU control circuit, the PWM output circuit, wherein the intensity of illumination testing circuit links to each other with the A/D conversion processing circuit, the A/D conversion processing circuit links to each other with the MCU control circuit, the PWM output circuit links to each other with constant-current power supply circuit, the intensity of illumination testing circuit cooperates with the A/D conversion processing circuit, with the intensity of illumination conversion of signals is voltage signal, after handling, MCU adjusts the output duty cycle of pwm control signal in real time, in order to change the constant current value of LED constant-current drive circuit.
2. the LED as claimed in claim 1 control circuit with an automatic light meter that throws light on is characterized in that described A/D conversion processing circuit comprises the two independent treatment circuit, and circuit is provided with illumination detecting sensor interface CN1, CN2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201019426U CN201623891U (en) | 2010-01-26 | 2010-01-26 | LED illumination automatic dimming circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201019426U CN201623891U (en) | 2010-01-26 | 2010-01-26 | LED illumination automatic dimming circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201623891U true CN201623891U (en) | 2010-11-03 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201019426U Expired - Fee Related CN201623891U (en) | 2010-01-26 | 2010-01-26 | LED illumination automatic dimming circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201623891U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102131331A (en) * | 2011-02-24 | 2011-07-20 | 复旦大学 | Weber's-law-based light-emitting diode (LED) control circuit |
| CN102256420A (en) * | 2011-07-23 | 2011-11-23 | 李鸿 | Intelligent dimming device for LED (light-emitting diode) streetlamp |
-
2010
- 2010-01-26 CN CN2010201019426U patent/CN201623891U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102131331A (en) * | 2011-02-24 | 2011-07-20 | 复旦大学 | Weber's-law-based light-emitting diode (LED) control circuit |
| CN102256420A (en) * | 2011-07-23 | 2011-11-23 | 李鸿 | Intelligent dimming device for LED (light-emitting diode) streetlamp |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101103 Termination date: 20130126 |