LED filament lamp how to choose the driving power?    

Update:02 May 2018

LED is a highly efficient light-emitting diode device. […]

LED is a highly efficient light-emitting diode device. It must work in a DC constant current environment in order to continuously emit bright light and illuminate the world. The quality of the driving power will directly affect its brightness and light quality. How to choose a good LED filament drive power is the key to the manufacture of cost-effective LED filament lamp.

Currently, there are three kinds of driving power for using LED filament lamps:


The first is a resistance-capacity buck power supply that will be phased out;


Second, the current mainstream non-isolated switch constant current drive power;


The third is the emerging high voltage linear constant current driving power.

At present, the mainstream products of LED filament lamps are C35 candle lamps and A60 bulb lamps, and they have a very small space for installing driving power.


In the early stage of LED filament lamp development, only a ring-shaped plastic piece was added between the glass bulb and the lamp cap to expand the space that can accommodate the power module; with the advent of a new generation of LED filament lamp special driver power chip, many LED driver power supply necessary protection functions All are concentrated inside the chip, their application circuit is more concise, the parts around the application circuit are more scarce, and the production cost is further reduced.


Today, the new generation of driver power chips and solutions with smaller footprints can meet the requirements of filamentless lamps.


At present, the grid voltages of various countries in the world are different. In many countries, two different grid voltages are used simultaneously, such as the United States, Canada, Mexico, Japan, Brazil, and Vietnam. The grid voltage varies from AC100V-240V with a large span. This requires that the filament lamp power supply can be applied to AC100V-240V input voltage.

The basic operating voltage and current of the filament lamp is DC150V/10-30mA. Therefore, the power supply will be designed for step-up (input AC90-130V), step-down (input AC180-265V), and automatic lift according to different input voltage ranges. Pressure (input AC90-265V) Three different modes to adapt to different grid voltages.


The general parameters of the filament lamp's mainstream product drive power:


1. Candle light power: 2W, 3W, 4W; Output voltage is DC150V, output current is 10-12mA, 14-15mA, 20-22mA;


2. Bulb power: 2W, 4W, 6W, 8W; Output voltage is DC150V, output current is 10-12mA, 22-24mA, 33-36mA, 44-48mA.




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