What kind of LED lamps and lanterns are there way dimmer?

LED as the mainstream of light source, its means of dimming plays a very important role. Not only in areas such as airports, hotels, office buildings to get a more comfortable environment, in today, reduce unnecessary electric light, in order to achieve the purpose of energy saving and emission reduction is one of the more important thing. And for the LED light source, by driving power dimmer than other fluorescent lamp, energy-saving lamp, high-pressure sodium lamp lights are easier to implement, so it should be added to raise to the various types of LED lamps and lanterns light function. A, is used for the LED dimmer with silicon controlled thyristor is a sine wave of alternating current may be cut and achieve the purpose of changing its RMS. Silicon controlled dimmer way when use usually only need to replace the original power switch with silicon controlled dimmer switch, by rotating the dimmer knob to achieve different brightness. The dimming method has the advantage of simple, practical, the overall installation costs low, only need to add a silicon controlled dimmer, which is one of the most popular way dimmer. A series of problems, however, silicon controlled dimmer. First of all, the SCR destroyed the sinusoidal waveforms, which reduces the power factor value, usually PF below 0. 5, and the more hours power factor, the worse conduction Angle ( A quarter when the brightness is only 0. 25) 。 Similarly, non-sinusoidal waveform increases the harmonic coefficient. Moreover, non sinusoidal waveform can produce serious interference signal on online way. Second, the PWM is used to adjust the LED light is a diode, it can realize fast switch. The switching speed of it can be as high as above microseconds. Is unmatched by any light emitting device. Therefore, as long as the power supply into a pulse constant-current source, use the method of pulse width, you can change the brightness. This method is called pulse width modulation ( 脉宽调制) The dimming method. PWM signal fast on and off the LED string of the advantages of the PWM dimming circuit principle diagram does not produce any chromatographic deviation. Because the LED always work in full range of current and between 0. Moreover, can have a high precision dimmer. Because the pulse waveform can completely control to high precision, so it's easy to achieve the accuracy of one over ten thousand. In addition, can be merged and digital control technology to control. Because any number can be easy to transform into a PWM signal. Even in a wide range of light, flashing phenomenon will not occur. Because does not change the constant-current source working conditions ( Step-up ratio or step-down ratio) And less likely to produce the problem such as overheating. PWM dimming must pay attention to the problem for the LED is in rapid switch state, if the working frequency is low, the human eye will be flashing. In order to make full use of human visual residue phenomenon, its working frequency should be higher than 100 hz, it is best to 200 hz. Third, 1 - 10 v dimming analog dimming during installation using a 1 - need to be configured 10 v dimmer switch, and a set of 1 - to link 10 v signal lines to the LED lamps and lanterns that move light driver inside for dimmer. This move light although the dimming effect is ideal, but the installation wiring more troublesome, 1 - 10 v dimmer way its signal easily affected by the length and the quality of wire rod, there might be a dimmer uneven, or when the same scene brightness different lamp brightness inconsistent phenomenon, wiring cost is higher. That is its biggest flaw, has caused a large number of promotion cannot reason. Remove the holidays for 30 degrees. 1 billion is 30 billion degrees. For the LED lamps and lanterns is at least possible energy saving after half, is 15 billion degrees. Can use automatically adjusting for at least another energy saving more than 10%, that is 1. 5 billion degrees. 0 per kilowatt-hour. 7 yuan, is to save 10. 500 million yuan. This is a very considerable number! The number is not including to be replace incandescent light bulbs, energy-saving lamps and LED energy saving light.
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