Three development potentials of LED luminaire dimming technology

As the LED application market continues to grow rapidly, the range of LED products continues to grow, and the LED brightness control function displayed on the demand for high-end products is also necessary. At the meeting, for example, LED lights and displays should be noted.

Dimming is a very common feature of lighting systems. For incandescent lamps, it can be easily implemented at low cost. The dimming of LED luminaires is difficult, but for architects and residential users, they are reluctant to lose the advantages of dimming control when switching to LED lighting. This involves a lot of knowledge about LED lighting.

Power factor is a very important factor because high power factor can reduce the loss of the distribution network. The most effective way to reduce the impact of electricity use on the environment is to reduce waste, so regulators around the world are further tightening their power factor specifications. An example of this is the Energy Star Solid State Lighting Energy Efficiency Specification (09/12/07), which states that the power factor (PF) for residential lighting products should be greater than 0.7 and the power factor (PF) for commercial lighting products should be greater than 0.9.

There are three main types of dimming methods for lamps, and three of them are dimming according to changes in LED drive current input. According to different circuit systems, it can also be divided into analog dimming and PWM dimming.

The first type: This dimming method is to dim the LED lamp by modulating the LED driving current. Since the brightness of the LED chip is proportional to the LED driving current, we can control the LED driving current to control the LED lamp. Light and dark.

Second: This dimming method is called pulse width modulation (PWM). The method is adjusted so that the driving current is square wave-shaped, and the pulse width is variable. After the modulation of the pulse width is converted into a time for modulating the continuous lighting of the LED lamp, the input power is also converted, thereby achieving energy saving and dimming. aims. The frequency is about 200Hz~10KHz as usual; because of the hysteresis of the human eye, it will not feel the sparkle of the light source during the dimming process. The advantage of this dimming method is that it can improve the heat dissipation performance of the LED. The defect is that the overshoot of the driving current must have a certain impact on the life of the LED chip. The hometown of Chinese lamps and lanterns "Yuyao area lighting enterprises rely on the local industry advantage, fully leveraged" Energy-saving and environmental protection features, in the design and development of products, the "energy-saving" brand, constantly applying new energy-saving and environmentally-friendly technologies to develop products to meet market demand. According to statistics, in the first four months of this year, Yuyao exported 2230 batches of energy-saving lamps, with a value of 50.06 million. The US dollar grew by 32.5% and 18.4% respectively.

Third: This method is called mimicking power failure blackout or linear method metod.Vid dimming method has the advantage that when the drive current linearly increases or decreases, the emission current of the LED chip life in the process is reduced, and the coloring scheme is stronger. The anti-nepriyatnost.Nedostatkom is the current process of changing the size of the disk, of course, to a certain extent the color temperature of the LED chip.