CN201114909Y - A lighting intensity control device for LED street lamps - Google Patents

Abstract

The utility model discloses a lighting intensity control device for an LED street lamp, which comprises: a power converter, through which an external AC power source can be converted into a DC constant current source for use by an LED light source; a road lamp controller, and The photosensitive sensor is connected with the time sensor, controlled by a remote control signal, and adopts pulse width modulation to adjust the working current of the DC constant current source input to the LED. The utility model solves the problems of inconsistency in lighting time of existing LED lamps, inconsistency in light decay of LED light sources caused by LED lamps, uneven brightness of LED lamps when full power is turned on, and the like.

Description

A lighting intensity control device for LED street lamps

Technical field:

The utility model relates to a control device, in particular to a device for controlling the illumination intensity of LED street lamps.

Background technique:

With the acceleration of urban construction and the emergence of image projects, a large number of urban lighting and decorative street lights have emerged. According to the requirements of my country's road lighting for brightness uniformity and luminance uniformity, current street lamps generally use more powerful lighting components and increase the height of street lamp poles to achieve the coverage and brightness requirements of lights. In order to reduce the energy consumption of road lighting, the illuminance requirements for road lighting are different in different time periods, so it is necessary to adjust the brightness of street lights according to the time period. Now there are three methods commonly used: 1) A street light uses different power 2) reduce the working voltage of the road lighting source, 3) turn on the street lights on both sides of the road at intervals, etc.

Now because LED has the advantages of energy saving, environmental protection, high efficiency, etc., it is widely used in street lamps, and the method of brightness control of LED street lamps is generally group control and reduce the driving current. But these two methods all have certain flaws.

When using the group control method, due to the characteristics of the LED light source, this will inevitably lead to inconsistent light decay of the LED light source due to the inconsistent length of time the LED light is lit. When the full power is turned on, the brightness of the lamp will be uneven, and affect lamp life.

Reducing the operating voltage of LED street lamps to reduce the illumination of street lamps can also meet the requirements of reducing energy consumption. Doing so will cause LEDs to work in a reduced current mode, resulting in the problem of chromatic aberration of LED light sources.

Invention content:

In view of the above problems, the purpose of this utility model is to provide a LED street lamp illumination intensity control device, which mainly uses constant current power supply for the LED street lamp light source, and adopts pulse width modulation to adjust the average working current of the street lamp, so as to achieve the control of street lamp illumination. requirements.

In order to achieve the above object, the utility model mainly adopts the following technical solutions:

A lighting intensity control device for LED street lamps, comprising:

A power converter, through which the external AC power can be converted into a DC constant current source for the LED light source;

A light controller is connected with a photosensitive sensor and a time sensor, controlled by a remote control signal, and adopts a pulse width modulation method to adjust the working current of the DC constant current source input to the LED.

The photosensitive sensor converts the light signal from the outside into an electric signal, processes it through the street lamp controller, and controls the working current of the DC constant current source input to the LED according to the external light intensity.

The time sensor inputs the generated time pulse signal to the street lamp controller, processes it through the street lamp controller, and controls the working current of the DC constant current source input to the LED according to the time.

The utility model mainly realizes the control of the LED light source current through the street lamp controller. During the daytime, the light signal from the outside is converted into an electrical signal through the photosensitive sensor, processed by the street lamp controller, and the work of the LED is controlled according to the external light intensity. Current, so that the LED has no working current; at night, control the LED current to make the LED work and emit light. In addition, the street lamp controller can control the working current of the LED according to the time through the time sensor. For example, within a period of time, control the current to make the LED glow. In another period of time, the LED is controlled to have no operating current.

Description of drawings:

Fig. 1 is a structural block diagram of the utility model.

Detailed ways:

The utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

As shown in Figure 1, the utility model is a lighting intensity control device for LED street lamps, which mainly includes: a power converter, one end of which is connected to an external 220V alternating current, and one end is connected to a DC/DC constant current source. It is used to convert the external 220V AC power into a constant DC source, and power the LED light source through the DC source.

There is also a street lamp controller connected to the DC/DC constant current source, through which the current output control of the DC/DC constant current source can be realized. Analyze and process, and control the output current of the DC/DC constant current source.

A photosensitive sensor is connected to the street lamp controller. The main function of the photosensitive sensor is to convert the external optical signal into an electrical signal and transmit it to the street lamp controller, and analyze and process it through the street lamp controller to judge the output of the DC/DC constant current source. Current size. During the daytime, the photosensitive sensor can sense the intensity of the external light signal, so the result of the induction is input to the street lamp controller in the form of an electrical signal, and the street lamp controller judges that under this light intensity, the LED does not need to work or the LED needs to be on. When working under low brightness, limit the current output of the DC/DC constant current source so that the current output is 0 or at a small value, then the LED does not emit light or the luminous intensity is low at this time; at night or when the external light is very weak , the photosensitive sensor senses that the external light signal is very weak, so the sensing result is input to the street lamp controller in the form of an electrical signal, and the street lamp controller judges that under this light intensity, the LED needs to work under a certain strong light, and then controls the DC /DC constant current source current output, so that the output current is a larger value, at this time, the current of this value is the power supply for the LED light source, so that the LED emits light.

There is also a time sensor connected to the street lamp controller, which can generate a time pulse signal according to a certain time and input it to the street lamp controller. After the street lamp analyzes the pulse signal, it can be judged whether the LED needs to work within a certain period of time. If the LED is required to work during this time period, control the DC/DC constant current source current output to supply power to the LED light source, and the LED will emit light; if the LED does not need to work during this time period, then control the DC/DC constant current source to have no current output. Then the LED does not emit light. For example, the pulse signal sent by the time sensor is when the LED light source works during the period from 5:00 to 6:00 in the morning, then the street lamp controller controls the DC/DC constant current source to have current output to supply power for the LED light source; if the pulse signal sent by the time sensor is During the period from 10 am to 11 am, the LED light source does not work, and the street light controller controls the DC/DC constant current source to have no current output.

In the utility model, a constant current power supply is adopted for the LED light source, and the DC/DC constant current source current output is adjusted by adopting a pulse width (PWM) modulation method to achieve the purpose of controlling the illumination of the street lamp.

A kind of LED street lamp lighting intensity control device provided by the utility model has been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the utility model. The description of the above embodiments is only used to help understand the utility model The method of the utility model and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the utility model, there will be changes in the specific implementation and application scope. In summary, the contents of this specification are not It should be understood as a limitation of the present utility model.

Claims (3)

1. A lighting intensity control device for LED street lamps, characterized in that it includes: A power converter, through which the external AC power can be converted into a DC constant current source for the LED light source; A light controller is connected with a photosensitive sensor and a time sensor, controlled by a remote control signal, and adopts a pulse width modulation method to adjust the working current of the DC constant current source input to the LED. 2. The LED street lamp lighting intensity control device according to claim 1, characterized in that: the photosensitive sensor converts the light signal from the outside into an electrical signal, processes it through the street lamp controller, and controls the DC constant current according to the external light intensity. Current source input to the LED operating current. 3. The lighting intensity control device for LED street lamps according to claim 1, characterized in that: the time sensor inputs the generated time pulse signal to the street lamp controller, processes it through the street lamp controller, and controls the DC constant current according to the time Source input to the operating current of the LED.

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