Long-mao has introduced three types of dimmable fluorescent and LED tunnel lights – Long-mao company, LED fluorescent lights – the electronics industry
Shanghai Long-mao micro Electronic Co., Ltd. recently launched several dimmable LED Fluorescent light. Although fluorescent light over the past more efficient, but it contains highly toxic substances – mercury, and it can not be dimmed. LED luminous efficiency will now have to catch up and exceed the normal fluorescent lamps, the brightness in the same circumstances, LED fluorescent lamp input power can be reduced by half, and non-toxic substances, is a kind of green Environmental protection New light. Moreover, LED is a very easy to change the brightness of the device, as long as the input of a pulse-width modulation (PWM) signal, you can adjust light, so long Mao launched three adjustable LED fluorescent light.
The first is a manual dimming LED fluorescent lamp, on many occasions to manually adjust the brightness of LED fluorescent lamps, which used manual dimming fluorescent and incandescent dimming lights installed in the same Switch Office of the knob, but not adopted as the incandescent SCR , So it will not cause interference in the power cord inside. It is only a low level of the PWM Signal Generator . Generate the required dimming signal, sent to the tunable light source of step-constant current drive SLM2842SD, and then sent to the LED fluorescent light be dimmed. The diagram is as follows:
Second is dimming LED fluorescent photosensitive
In many occasions, the environment alone will change at any time, for example, window office, sunny weather, will be very bright, this time the brightness of fluorescent light would not be so, using photosensitive automatic dimming The LED fluorescent light after dark can be adjusted in a number of sunny days, rainy weather in some of the tone light, so that further energy saving. In addition, fluorescent in subway cars in a similar situation, usually in urban areas in the underground subway running, this time on a larger interior brightness. And to the suburbs, subway usually open to the ground, when the brightness is very bright outside, you do not need internal lighting, and if the use of photosensitive automatic dimming inside you can adjust the brightness.
Its constituent principles and manual dimming similar, but the manual dimming knob into a photosensitive element, to change the use of microcontroller PWM signal generator to generate the PWM dimming signal.
Third dimmable LED Lighting Not necessarily a fluorescent form, which can be any kind of high-power LED lamps, mainly for light in the tunnel. The application of light in the tunnel, also need to day and night, sunny or rainy days to adjust the brightness of LED lamps, which need a long distances (a few kilometers to tens of kilometers) dimming device. Shanghai Dragon Mao companies successfully resolved this issue, a very reliable long-range dimming system.
Now three dimming devices have been patented.
LED fluorescent lamps which are used by the thermal resistance is only 45 º C / W high-brightness SMD LED, and the use of the lamp with a half aluminum radiator, due to drive an external power supply, you can use without built-in space all aluminum heat sink tube, thereby increasing cooling efficiency, while avoiding the built-in power supply caused some heat LED light decline, thus reducing the LED junction temperature, extended LED lifetime guarantee 50,000 hours of life. And AC power using isolated Switching Power Supply , Can withstand the test of CE to fight hypertension, but also the possibility of electric shock to lift the user. This fluorescent lamp has started small batch production to meet the needs of our customers.
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