CN210899752U

CN210899752U - Intelligent lighting control system

Info

Publication number: CN210899752U
Application number: CN201920864638.8U
Authority: CN
Inventors: 李小川
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-06-11
Filing date: 2019-06-11
Publication date: 2020-06-30
Anticipated expiration: 2029-06-11

Abstract

The utility model discloses an intelligence lighting control system, this lighting control scheme converts control voltage, control LED's operating current through the strong and weak of sampling external light. The scheme comprises an ambient light sampling and voltage conversion circuit, an LED current control circuit, a voltage negative feedback type LED constant current control circuit and a voltage self-locking type LED protection circuit. The LED lamp controller has the advantages that reasonable illumination of the LED lamps is controlled, the stability and reliability of circuit work are guaranteed, sunlight illumination is fully utilized, the purpose of saving resources is achieved, the LED lamps with any power and quantity can be controlled by one controller, the use is convenient, and the system is stable.

Description

Intelligent lighting control system

Technical Field

The utility model relates to the field of lighting technology, especially, relate to an intelligent lighting control system.

Background

At present, the problems of various lamps, such as different quality, flickering light, poor night lighting and electric energy waste in the daytime, commonly exist in industrial production, offices, teaching and commercial places.

The excellent illumination control system not only reduces the control cost, but also can realize reasonable illumination and illumination according to needs, not only can protect eyesight and reduce myopia, is energy-saving and environment-friendly, and can also improve the learning and working efficiency.

SUMMERY OF THE UTILITY MODEL

The utility model aims at solving the problem existing in the prior art and providing an intelligent lighting control system.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

an intelligent illumination control system comprises a power supply, an illumination circuit and a control circuit, wherein two ends of the power supply are connected with the control circuit, the control circuit is connected with a lamp illumination circuit in series, and an ambient light sampling and voltage conversion circuit, an LED current control circuit, a voltage negative feedback type LED constant current control circuit and a voltage self-locking type LED protection circuit constant current circuit are arranged in the control circuit;

the control circuit comprises a constant resistor R1, a constant resistor R2 and a photosensitive element D1, wherein the photosensitive element D1 is connected with the constant resistor R2 in parallel and then connected with R1 in series, and the ambient light intensity in a certain range is converted into the variable voltage in a certain range.

A field effect tube S1 for controlling the brightness of the LED lamp is arranged in the lighting circuit;

the constant current circuit comprises a feedback resistor R3, the feedback resistor R3 is connected with the source electrode of a field effect transistor S1, and the constant current circuit also comprises a triode Q1 for protecting an LED.

Specifically, the drain of the field-effect transistor S1 is connected to one end of the LED lamp, the other end of the LED lamp is connected to the positive electrode of the power supply, the source of the field-effect transistor S1 is connected to one end of the feedback resistor R3, the other end of the feedback resistor R3 is connected to the negative electrode of the electrode, and the gate of the field-effect transistor S1 is connected to the voltage output end of the photosensitive element D1.

Specifically, the triode Q1 is an NPN triode, the collector of the triode Q1 is connected to the gate of the field effect transistor S1, the emitter of the triode Q1 is connected to the negative electrode of the power supply, and the base of the triode Q1 is connected to the source of the field effect transistor S1.

Specifically, the constant current control feedback resistor R3 and the triode Q1 form an LED overcurrent protection circuit.

Preferably, the photosensitive element D may be a photoresistor, a photo diode, a triode or a silicon photocell.

Preferably, the lighting circuit is controlled by a field effect transistor, the number of the lighting units is at least one, and the lighting units can be multiple, the sampling voltage determined by the photosensitive element D1 is shared among the lighting units, and the lighting units are connected to the power supply in parallel.

Compared with the prior art, the beneficial effects of the utility model are that: the illumination control system controls the illumination power of the LED lamp according to the intensity of external light, fully utilizes sunlight illumination, realizes full-power illumination at night and intelligent light supplementing illumination effect in the daytime, and saves resources; meanwhile, one controller can control the LED lamps with any power, and one controller can also control any number of LED lamps, so that flicker is avoided and the system is stable.

Drawings

Fig. 1 is the utility model provides an intelligence lighting control system's schematic structure diagram.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

Referring to fig. 1, an intelligent lighting control system includes a dc power supply switching power supply corresponding to a load power, an ambient light sampling and voltage converting circuit, an LED current control circuit, a voltage negative feedback type LED constant current control circuit, and a voltage self-locking type LED protection circuit.

Specifically, including constant resistance R1, constant resistance R2 and light sensing element D1 in the control circuit, light sensing element D1 and constant resistance R2 parallel connection, establish ties with constant resistance R1 again, and the positive pole of power is connected to constant resistance R1, light sensing element D1 can be photo resistance, two triodes of photoelectricity or silicon photocell, and light sensing element D1 can show different resistance according to the size of outside illumination.

Further, the lighting circuit comprises an LED lamp and a field effect transistor S1 for controlling the power of the LED lamp, and the constant current circuit comprises a feedback resistor R3 and a protection triode Q1.

Furthermore, the drain of the field effect transistor S1 is connected to one end of the LED lamp, the other end of the LED lamp is connected to the positive electrode of the power supply, the source of the field effect transistor S1 is connected to one end of the feedback resistor R3, the other end of the feedback resistor R3 is connected to the negative electrode of the electrode, and the gate of the field effect transistor S1 is connected to the voltage output end of the photosensitive element D1.

Further, the triode Q1 is an NPN triode, a collector of the triode Q1 is connected to the voltage output terminal of the photosensitive element D1, an emitter of the triode Q1 is connected to a negative electrode of the power supply, and a base of the triode Q1 is connected to a source of the field effect transistor S1.

The power supply adopts a direct current switch power supply, and preferably adopts a high-power 5-300V constant voltage switch power supply which is mature in the prior art and is adaptive to the power of the LED lamp.

It is worth to be noted that the lighting system determines the proper rated working current of the LED lamp according to the actual power requirement, and the grid source voltage corresponding to the rated working current of the LED lamp can be obtained by looking up the specification of the field effect tube, so that the maximum grid source voltage value U of the LED lamp can be obtained_GM。

Furthermore, the lighting system adopts U as a circuit for measuring the resistance by designing a voltammetry method_GMThe values are used as the power supply voltage of the circuit, and the resistance values of the light-sensitive element D1 in the actual working environment are measured to determine the resistance values of R1 and R2 when the ambient light changes from 30LUX to 500 LUX.

The working principle is as follows: u of FET S1 in the absence of ambient light_GSAt maximum, the LED lamp is in a rated working state; when light is irradiated, the photosensitive element D has different resistance values under different ambient light, and after being connected with R2 in parallel, different voltages are obtained and are used as U_GThe LED lamp has different working currents; when the ambient light becomes stronger, the resistance of the photosensitive element D becomes smaller, U_GThe current is reduced, the working current of the LED lamp is reduced, and the light becomes dark.

The lighting system can control the illumination of the LED lamp according to the intensity of external light, fully utilizes sunlight for illumination, realizes night full-power illumination, and achieves the effect of intelligent light supplementing illumination in the daytime, thereby saving resources.

Further, since the FET S1 is used as a current control device, its current I_DSIs composed of U_GSAnd in control, because the LED lamp is nonlinear, the constant current circuit is set to keep the working current constant, and a protection circuit is designed.

When the operating current of the LED lamp becomes larger due to temperature and other factors, the voltage drop U of the feedback resistor R3₃Also, R3 is a negative feedback resistance of DC voltage, which is represented by U_GS＝U_G-U₃It can be known that U₃Becomes larger to make U of field effect transistor S1_GSIs reduced to thereby control I_DSThe current of the LED lamp is constant, and the lighting system is provided with a constant current circuit for stabilizing the current of the LED lamp.

When the LED working current is increased, a voltage drop is generated on R3 to serve as an emitting junction bias voltage of the triode Q1, when the voltage drop on R3 reaches 0.7V, the triode Q1 is changed from off to on, and U1 is changed into on_GDecrease, make I_DReducing and setting feedback resistor R3 with proper resistance and power, and the maximum working current I of the LED lamp_MThe LED lamp is limited to protect the LED lamp, so that the lighting system is stable.

As shown in fig. 1, since the field effect transistor needs a gate control voltage and does not need a working current, the voltage divided by the control circuit can control any number of LED lamps to synchronously work, the number of the lighting circuits can be more than one, and the lighting circuits are connected in parallel, so that one controller in the lighting control system can also control any number of LED lamps to synchronously light.

Preferably, the lighting control system is provided with a plurality of lighting circuits, the lighting circuits are connected in parallel, one end of a second LED lamp is connected with the positive electrode of the power supply, the other end of the second LED lamp is connected with the drain electrode of the field effect transistor S2, the source electrode of the field effect transistor S2 is connected with one end of the direct current feedback resistor R4, the other end of the direct current feedback resistor R4 is connected with the negative electrode of the electrode, the gate electrode of the field effect transistor S2 is connected with the voltage output end of the photosensitive element D1, the collector electrode of the triode Q2 is connected with the gate electrode of the field effect transistor S2, the emitter electrode of the triode Q2 is connected with the negative electrode of the power supply, and the base electrode of the.

Furthermore, the resistance values of the constant resistor R1, the constant resistor R2 and the feedback resistor R3 are adjusted to design different U_GMThe LED lamp control system has the advantages that one controller can simultaneously control the work of a plurality of LED lamps with different powers, flicker is avoided, and the system is stable.

The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.

Claims

1. An intelligent illumination control system is characterized by comprising a power supply, an illumination circuit and a control circuit, wherein two ends of the power supply are connected with the control circuit, the control circuit is connected with a lamp illumination circuit in series, and an ambient light sampling and voltage conversion circuit, an LED current control circuit, a voltage negative feedback type LED constant current control circuit and a voltage self-locking type LED protection circuit constant current circuit are arranged in the control circuit;

the control circuit comprises a constant resistor R1, a constant resistor R2 and a photosensitive element D1, wherein the photosensitive element D1 is connected with the constant resistor R2 in parallel and then connected with R1 in series, so that the ambient light intensity in a certain range is converted into variable voltage in a certain range;

2. The intelligent lighting control system according to claim 1, wherein a drain of the fet S1 is connected to one end of the LED lamp, the other end of the LED lamp is connected to a positive terminal of a power supply, a source of the fet S1 is connected to one end of the feedback resistor R3, the other end of the feedback resistor R3 is connected to a negative terminal of the electrode, and a gate of the fet S1 is connected to a voltage output terminal of the photosensitive element D1.

3. The intelligent lighting control system of claim 1, wherein the transistor Q1 is an NPN transistor, the collector of the transistor Q1 is connected to the gate of the fet S1, the emitter of the transistor Q1 is connected to the negative terminal of the power supply, and the base of the transistor Q1 is connected to the source of the fet S1.

4. The intelligent lighting control system of claim 1, wherein a negative feedback resistor R3 is provided as a constant current control, and a transistor Q1 is provided as an LED overcurrent protection.

5. The intelligent illumination control system of claim 1, wherein the light sensing element D can be a photo-resistor, a photo-diode, a triode or a silicon photo-battery.

6. The intelligent lighting control system according to claim 1, wherein the fet controls one lighting circuit unit, the number of lighting circuit units is at least one, and may be multiple, all the lighting circuit units share a sampling voltage determined by the light sensing element D1, and the lighting units are connected in parallel to a power supply.