CN201651825U - Photosensitive automatic dimming LED lamps - Google Patents

Abstract

The utility model provides a photosensitive automatic dimming LED lamp, which includes an AC/DC switching power supply and an LED lamp, and further includes: a DC/DC constant current drive power supply, which is connected to the AC/DC switching power supply and the LED lamp; pulse width modulation A signal generator, connected to the DC/DC constant current drive power supply, generates a pulse width modulation signal and inputs it to the connection of the DC/DC constant current drive power supply; and a photosensitive element, connected to the pulse width modulation signal generator. When the utility model is applied to fluorescent lamps, compared with 50% electricity saving by using ordinary fluorescent lamps, it can save more than 10% electricity.

Description

Photosensitive automatic dimming LED lamps

technical field

The utility model relates to an LED fluorescent lamp, in particular to a photosensitive automatic dimming LED lamp. the

Background technique

Existing ordinary fluorescent lamps and LED fluorescent lamps are mostly fixed and non-dimmable, but in homes, offices, stores, and shopping malls, windows are often provided, and sunlight can also enter the room. When the outside sunlight enters the room on a sunny day, the indoor fluorescent lamp does not need to be too bright, so it is required to be dimmable, and it is best to use automatic photosensitive dimming. However, the existing ordinary fluorescent lamps and LED fluorescent lamps cannot perform any dimming. the

Utility model content

The purpose of the utility model is to transform the ordinary fluorescent lamp and the energy-saving LED fluorescent lamp which cannot be dimmed into a new type of LED fluorescent lamp which can be photosensitively dimmed, so as to achieve the purpose of energy saving. the

The purpose of this utility model is achieved by the following technical solutions:

A photosensitive automatic dimming LED lamp, including an AC/DC switching power supply and an LED lamp, and also includes: a DC/DC constant current drive power supply, connected to the AC/DC switching power supply and the LED lamp, for driving the LED lamp; A wide modulation signal generator, connected to the DC/DC constant current drive power supply, for generating a pulse width modulation signal and inputting it to the DC/DC constant current drive power supply; and a photosensitive element, connected to the pulse width modulation signal generator , used to sense ambient brightness. the

The PWM signal generator can be a single-chip microcomputer, or a general pulse width modulation generator. the

One photosensitive element can control a plurality of LED lamps with adjustable dimming constant current driving sources. the

Or a pulse width modulation generator controlled by a photosensitive element can control multiple LED lamps with a dimmable constant current drive source. the

The photosensitive automatic dimming LED lamp also includes a power drive circuit, one end of the power drive circuit is connected to the output end of the pulse width modulation signal generator, and the other end is connected to the DC/DC constant current drive power supply. One said pulse width modulation signal generator can not only control one LED lamp, but also can control multiple LED lamps at the same time. the

The utility model can dim the LED fluorescent lamp in sunny days by adopting a photosensitive element to be sensitive to light, so that further energy saving can be achieved. the

The utility model can realize the adjustable light of the LED fluorescent lamp by adding a DC/DC constant current drive power supply to the common switch constant voltage power supply. the

The utility model adjusts brightness by adopting a PWM signal generator, and the circuit is simple. the

The utility model can increase the flexibility of control by sending the signal obtained by the photosensitive element to a single-chip microcomputer or a pulse width modulation signal generator to generate a corresponding pulse width modulation dimming signal. For example, time control can be added in the future to become a timing switch light. And it can also avoid the deviation of LED color temperature. the

The utility model can control a plurality of LED lamps by one photosensitive element and adjust the light of a plurality of LEDs by strengthening the driving ability of the pulse width modulation signal, thereby improving the control ability. the

The implementation and advantages of the present utility model will be further explained below in conjunction with the accompanying drawings. the

Description of drawings

Fig. 1 is the structural representation of the LED fluorescent lamp in the prior art;

Fig. 2 is a structural schematic diagram of a LED fluorescent lamp according to the utility model

Fig. 3 is a schematic structural diagram of a manual dimming LED lamp according to the present invention. the

The reference signs involved in the figure are as follows:

100, 200, 300 LED lamps 11, 21, 31 LED lamps

12, 22, 32 AC/DC switching power supply 23, 33 DC/DC constant current drive power supply

24, 34 PWM signal generator 25, 35 photosensitive element

Detailed ways

Referring to FIG. 1 , the LED lamp 11 in the LED fluorescent lamp 100 in the prior art is driven by a non-isolated or isolated AC/DC switching power supply 12 , so it is difficult to realize dimming of the LED. the

Referring to Fig. 2, the LED lamp 21 in a light-sensitive automatic dimming LED lamp 200 according to the present invention is still driven by an AC/DC switching power supply 22, but an AC/DC switching power supply 22 and the LED lamp 21 are connected Dimming DC/DC constant current driving power supply 23, photosensitive element 25 senses ambient brightness and generates pulse width modulation (PWM, Pulse Width Modulation) signal after being processed by pulse width modulation (PWM, Pulse Width Modulation) signal generator 24, the The PWM signal controls the DC/DC constant current drive power supply 23 to perform PWM dimming on the LED lamp 21 . In this solution, after using an ordinary AC/DC switching constant voltage power supply and a DC/DC dimmable constant current power supply, it is easy to realize pulse width modulation (PWM, Pulse Width Modulation) dimming. the

Referring to Fig. 3, another manual dimming LED lamp 300 according to the present invention also includes an LED lamp 31 and an AC/DC switching power supply 32, and also includes: a dimmable DC/DC constant current driving power supply 33, connected to the AC/DC switching power supply 32 and LED lamp 31 are used to drive LED lamp 31; PWM signal generator 34 is connected to the DC/DC constant current driving power supply 33 to generate PWM signal and input it to DC/DC constant current Drive power supply 33; power drive circuit 36, one end is connected to the output end of pulse width modulation signal generator 34, and the other end is connected to the described DC/DC constant current drive power supply 33; and photosensitive element 25, connected to the PWM signal generator , the ambient brightness is sensed and processed by the PWM signal generator 34 to generate a pulse width modulation signal. In this embodiment, one potentiometer 34 can control at least two LED lamps 30 , including lamps in the first lamp unit k ₁ and the nth (n≥2) lamp unit kn.

In an embodiment of the present invention, the PWM signal generator can be a general PWM signal generator or a single-chip microcomputer, which can increase flexibility, for example, time control can also be added in the future, such as timing brightening, Timing switch lights, etc. the

In another embodiment of the present utility model, one photosensitive element can control multiple LED lamps with adjustable dimming constant current drive source, which improves the driving capability of the control signal, and can control multiple LED lamps with one photosensitive element. LED luminaires, thus improving the ability to control. In yet another embodiment of the present invention, a PWM signal generator controlled by a photosensitive element can control a plurality of LED lamps with adjustable constant current driving sources. the

The utility model adopts the photosensitive automatic dimming technology, after adopting this technology, the LED fluorescent lamp can be dimmed in sunny days, so that further energy saving can be achieved. Moreover, in the LED dimming of the utility model, the PWM dimming method is adopted for dimming, and after the PWM dimming is adopted, the deviation of the LED color temperature can also be avoided. the

In the current situation of atmospheric warming and energy shortage, further energy saving is a top priority. my country's lighting electricity consumption accounts for about 20% of the total electricity consumption, of which indoor electricity consumption accounts for about 10%, and fluorescent lamps account for 70% to 80%. According to statistics, there are about 5 billion fluorescent lamps in South China, and about 5 billion in East China. There are about 5-10 billion sticks. If all LED fluorescent lamps are used, it can save 50% of electricity, which is equivalent to saving 2 billion kWh of electricity in big cities such as Beijing and Shanghai. If photosensitive dimming is used, it can save more than 10% of electricity, which is equivalent to 200 million kWh of electricity. , its economic effect is very astonishing. the

In addition, it should be pointed out that the above description is only a preferred embodiment of the present utility model, and it can be applied to various LED lamps and is not limited to LED fluorescent lamps. Under the premise, some improvements and modifications can also be made, and these improvements and modifications should also be regarded as the protection scope of the present utility model. the

Claims (5)

1. A photosensitive automatic dimming LED lamp, comprising an AC/DC switching power supply and an LED lamp, is characterized in that, the photosensitive automatic dimming LED lamp also includes: A DC/DC constant current drive power supply is connected to the AC/DC switching power supply and the LED lamp; A pulse width modulation signal generator, connected to the DC/DC constant current drive power supply, which generates a pulse width modulation signal and inputs it to the DC/DC constant current drive power supply; and The photosensitive element is connected to the pulse width modulation signal generator. 2. The photosensitive automatic dimming LED lamp according to claim 1, wherein the pulse width modulation signal generator is a single-chip microcomputer. 3. The photosensitive automatic dimming LED lamp according to claim 1, wherein one photosensitive element can control multiple LED lamps. 4. The photosensitive automatic dimming LED lamp according to claim 1, wherein a pulse width modulation signal generator controlled by a photosensitive element can control multiple dimmable constant current driving sources. 5. The photosensitive automatic dimming LED lamp according to claim 1, wherein the photosensitive automatic dimming LED lamp further comprises a power drive circuit, one end of the power drive circuit is connected to the output terminal of the pulse width modulation signal generator, The other end is connected to the DC/DC constant current drive power supply. the

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