LED dimming is best to use PWM dimming using PWM dimming, you can switch on the wall to install a simple PWM generator, and then use the potentiometer to control the PWM duty ratio to achieve dimming. But if the bright lights should switch off, then you need to add a pair of lines. Therefore not compatible with the original wall of the thyristor switch leads. The original thyristor switch only two leads, it can be can dimmer switch. This advantage is very difficult compatible. But in fact, the most commonly used real light is dimming lamp or floor lamp, dimmer switches that are installed in the supply line is not a wall, it just do not care to take advantage of the two leads of the wall. In other words, PWM dimming can be applied directly dimmable lamp.
Segmented dimmer switch
Taiwan has launched a company called EZ-Dimming a four paragraphs of GM6182 switch dimming regarded as a good solution. Only use ordinary light switch on the wall will be able to achieve dimming paragraph 4, the first to open the full brightness, the second opening is 60% brightness, the third opening is 40% brightness, the fourth opening of 20% brightness. The advantage of this system is to use an ordinary wall switch dimming. And its power factor up to 0.92 or more. Did not produce interfering signals into account. Disadvantage is not continuous dimming. There are a number of operational problems.
Remote control dimmer
Infrared remote control for LED dimming. This of course is the ideal solution. Can switch lights, and the use of a continuous PWM dimming. Disadvantage is the high cost, there is no uniform standard, only for high-end residential.
In fact, we think we should come back to the main purpose of dimming should be. All previously mentioned dimming purpose is to meet the home for people in different contexts require different light intensity. For example, when watching television may be darker, reading time may be brighter. These are mostly in the residence. Few offices, shopping malls, factories, schools, install dimmer lights. And most of these places is installed fluorescent lamps, energy saving lamps, it is impossible or difficult to achieve dimming continuous dimming.
Epoch-making for energy-saving and dimming
Ever since mankind realized that we must do everything possible energy conservation in order to solve the urgent problems atmospheric warming, how to reduce lighting electricity as an important issue on the agenda. Because lighting electricity for 20% of total energy consumption. Fortunately, there have been energy-efficient LED, LED itself five times more energy-efficient than incandescent than fluorescent lamps, energy saving lamps have about twice, but unlike fluorescent lamps, energy saving lamps as mercury. If the dimming can also be energy efficient, it is very important energy saving means. But in the past all light sources are not easy to achieve dimming, and easy dimming the LED is a great advantage. Because in fact, on many occasions without lights or at least not so bright, but it was very bright light, such as midnight to dawn hours of the street; subway cars to the suburbs from the ground open ground in the car lights; more common is near a sunny window when the offices, schools, factories and other fluorescent lamps are also opened there. These places have to waste a day do not know how much power! Past because of high pressure sodium lamps, fluorescent lamps, ceiling lamps, energy saving lamps can not dimming, can only forget. Now switch to LED later, you can freely adjust the light, which can save energy completely down. So for lamp dimming, the family is not the main wall of the dimming applications, the market is very small. Instead, lights, offices, shopping malls, schools, factories demand dimming is more important occasion, not only a huge market, and saving considerable. These occasions do not need a manual dimming but auto-dimming, intelligent dimming.
Dimming LED street lights
Generally, street lights after midnight there is nothing useful, so the usual practice is to turn off the lights after 12:00 or the opening half brightness. But the most reasonable approach is based on the traffic lights to control the brightness, or even fully adaptive control of brightness.
In order to achieve this intelligent dimming, is actually very simple. As long as the value of the region’s traffic counts curve input to a microcontroller, according to this curve gives the PWM dimming signal to the constant-current drive source can be achieved.
Photosensitive automatic dimming LED lights
In strong sunlight in order to reduce unnecessary lighting, you can use light-sensitive auto-dimming LED lamp (or any other LED lamps).
Photosensitive element is the role of feelings around the sun, if the sun is stronger then outputs a PWM signal to all close to daylight LED lamps (such as LED fluorescent lamp), put their brightness dimmed. A dimming signal generator can adjust many LED lamps, as long as the source of these lamps constant current driver with PWM dimming control interface. This dimming system itself, efficiency up to 92% or more. But there is no line and the wall triac dimmer compatibility issues. This fully automatic adaptive energy-saving dimming any fluorescent lamps, energy saving lamps, high pressure sodium and other gas discharge tube can not be achieved, but it is LED lamps best.