An LED is a light-emitting diode device that must operate under a constant DC current environment to continuously and stably emit bright light to illuminate the world. The quality of the driver directly affects the brightness and light quality of the emitted light. Choosing a good LED filament driver is key to manufacturing cost-effective LED filament lamps.
Currently, there are three types of driver power supplies used for LED filament lamps: the first is the soon-to-be-obsolete RC step-down power supply; the second is the currently mainstream non-isolated switch constant current driver power supply; and the third is the emerging high-voltage linear constant current driver power supply.
Currently, the mainstream LED filament lamps are C35 candle lamps and A60 bulb lamps, which have very limited space to install driver power supplies.
In the early stages of LED filament lamp development, only a ring-shaped plastic component was added between the glass bulb and the lamp base to expand the space that could accommodate the power supply module. With the advent of a new generation of dedicated LED filament lamp driver power supply chips, many of the protection functions necessary for LED driver power supplies have been condensed into the chip. Their application circuits are simpler, the components around the application circuits are fewer, and the production cost has been further reduced.
Today, new-generation driver power supply chips and solutions with smaller footprints can meet the requirements of filament lamps without plastic parts.
Currently, the power grid voltage varies from country to country. Many countries use two different power grid voltages simultaneously, such as the United States, Canada, Mexico, Japan, Brazil, and Vietnam. The power grid voltage ranges from AC100V to 240V, which is quite large. This requires the power supply of filament lamps to be compatible with input voltages of AC100V to 240V.
The basic requirements for the working voltage and current of filament lamps are DC150V/10-30mA. Therefore, the power supply is designed with three different modes according to different input voltage ranges: boost (input AC90-130V), buck (input AC180-265V), and automatic boost/buck (input AC90-265V) to adapt to different grid voltages.
Standard parameters of mainstream driver power supplies for filament lamps:
1. Candle lamp power: 2W, 3W, 4W; output voltage: DC150V, output current: 10-12mA, 14-15mA, 20-22mA; 2. Bulb lamp power: 2W, 4W, 6W, 8W; output voltage: DC150V, output current: 10-12mA, 22-24mA, 33-36mA, 44-48mA.
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