Dimmable LED driver is an LED power supply that integrates dimming function. It transforms AC voltage to DC voltage and is available in constant current and constant voltage output. There are various types of dimming interface available: 0-10V, DALI, DMX and RF/WiFi wireless.
A constant current driver outputs a fixed DC current and variable voltage range, which is suitable for LED downlights, LED panels and LED wall washers with constant current input. A constant voltage driver outputs a fixed DC voltage and variable current range, which suitable for LED strips and LED ribbons with constant voltage input. You have to choose the right driver types for your LED lights.
The dimming interface means the control signal. 0/1-10V and resistor are traditional signal for LED driver. Nowadays, intelligent solutions including DALI, DMX and RF/WiFi are becoming more and more popular. DALI and DMX are digital dimming protocols that are suitable for large lighting projects that require intelligent control.
A DMX LED driver is designed with built-in DMX interface which receives DMX signal and can be controlled by universal DMX master controllers, each DMX512 system capacity can be up to 512 lamps due to 512 addresses it has. All lamps can be controlled individually or be grouped to control. A DALI LED driver is designed with built-in DALI interface which receives DALI signal and can be controlled by universal DALI master controllers, each DALI system capacity can be up to 64 lamps due to 64 addresses it has. All lamps can be controlled individually or grouped, DALI system can have 16 groups. Both of them have scene function to define a light value for designated group.
There are many important parameters to be considered when choosing a dimmable LED driver. First is power factor, which is parameter that defines the power that does useful work. Second is efficiency, which defines how energy efficient a driver is. Both of them are the most important parameters. The higher power factor and efficiency a driver has, the better the driver is. PWM frequency is another important one that determines whether the driver has flickering and buzzing noise when dimming. Generally, a high frequency can lead to noise without flickering, and a low frequency can result in flickering but no noise.
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