The company launched three adjustable light LED fluorescent lamp and tunnel light

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Shanghai long Dms Microelectronic Ltd recently launched several dimmable LED fluorescent lamp. Although the fluorescent lamp in the past, although the luminous efficiency is relatively high, but it contains toxic substances - Mercury, and it can not be dimming. Now the luminous efficiency of LED has caught up with and surpassed the common fluorescent lamp, the brightness in the same case, the input power of LED fluorescent lamp can be reduced by half, and does not contain toxic substances, is a kind of green light source. Not only that, LED is a very easy to change its brightness of the device, as long as the input of a pulse width modulation (PWM) signal, you can adjust the light, so the company launched a three adjustable light LED fluorescent lamp.

First is manual dimming LED fluorescent lamp, need to manually adjust the brightness of LED fluorescent lamp on many occasions, this manual dimming fluorescent lamp and installation using the ordinary incandescent lamp dimming in the light switch at the knob, but unlike incandescent lamp adopts controlled silicon, so it will not cause interference in the power line. It is only a low level PWM signal generator. The required dimming signal is sent to the adjustable constant current drive SLM2842SD, and then sent to the LED fluorescent lamp to adjust the light. The block diagram is as follows:

Second is light dimming LED fluorescent lamp

On many occasions, the ambient light is subject to change, for example in the window of the office, in sunny weather, will be very bright, and the brightness of the fluorescent lamp is not so bright, after using LED fluorescent lamp automatic dimming light, can be in the sunny dim some. In rainy weather is brighter, so you can further save energy. In addition, there is a similar situation in the subway car fluorescent lights, in the urban areas of the subway is usually in the underground operation, then the car inside the need for greater brightness. And to the suburbs, the subway is usually open to the ground, when the brightness is very bright outside, it does not require internal lighting, if the use of photosensitive automatic dimming can automatically adjust the brightness of the carriage.

It is similar to the composition of the principle of manual dimming, but the manual dimming knob into a photosensitive element, the PWM signal generator into a single chip to generate PWM dimming signal.

Third light adjustable LED lamp is not the fluorescent lamp, and can be any of a high-power LED lamp, tunnel lamp is mainly used in. In the application of tunnel light, it is also necessary to adjust the brightness of the LED lamp according to the day night, sunny day or rainy day, which requires a device capable of adjusting the distance (a few kilometers to tens of kilometers). The company has successfully solved this problem and put forward a kind of very reliable remote dimming system in Shanghai.

Now the three dimming device has been patented.

LED fluorescent lamps are used in high brightness SMD LED with thermal resistance of only 45oC/W, and the lamp tube with half aluminum radiator, driven by the external power supply, can be used Aluminum Alloy without built-in space full fin tube, thus improves the cooling efficiency, but also avoid the built-in power the heat induced by partial LED attenuation, thus reducing the junction temperature of LED, prolong the life of LED, can guarantee the service life of 50 thousand hours. AC power supply and the use of isolated switching power supply, can withstand the test of high voltage CE play, but also lifted the possibility of electric shock. This kind of fluorescent lamp has already started small batch production to meet the needs of customers.