Sinrace Power Supply Technology (Shenzhen) Co., Ltd.

Drivers allow dimming and color-changing or sequencing of LEDs. LEDs are easily integrated with circuits to control dimming and color-changing so that these functions can respond to preset commands or occupant presence or commands.
Dimming. Drivers with dimming capability can dim the LED light output over the full range from 100% to 0%.

Dimming drivers can dim LEDs by reduction in the forward current, pulse width modulation (PWM) via digital control, or more sophisticated methods. Most dimming drivers operate using the PWM method. With this method, the frequency could range from a hundred modulations per second to as high as hundreds of thousands of modulations per second, so that the LED appears to be continuously lighted without flicker. A benefit of the PWM method is that it enables dimming with minimal color shift in the LED output. According to the Lighting Research Center, dimming causes LEDs to experience a similar shift in spectral power distribution as an incandescent lamp. However, if colored LEDs in an array are used to produce white light, the amount of shift, particularly with red and yellow LEDs, may produce an undesirable effect on the white light that is produced by the system.
Dimming does not result in a loss of efficiency. During dimming, the LEDs are still operated at the same voltage and current as during full light output. In addition, lamp life is not affected by dimming, as is sometimes the case with frequently dimmed fluorescent lighting. Rather, dimming LEDs may lengthen the useful life of LEDs, because dimming can reduce operating temperatures inside the light source.
Color Control. Drivers can also be used for color-changing or sequencing. This can be achieved by dimming a mix of colored LEDs in an array to change colors.
Another option is that the driver can work with a color sequencer, which receives the 10V or 24V LED driver output and converts it into three-channel output—usually red, blue and green—that can be mixed to create a wide, dynamic range of colors. When a sequencer is used, it generates a preset sequence, with color changes occurring at a speed determined by the specifier.
A third option is for each LED to be individually controlled and programmed by interfacing with DMX digital controller, enabling thousands of LEDs to dynamically dim up or down to create a seemingly infinite spectrum of colors.
Interoperability with other control devices. Most LED drivers are compatible with commercially available 0-10V control devices and systems such as occupancy sensors, photocells, wallbox dimmers, remote controls, architectural and theatrical controls, and building and lighting automation systems. LEDs can also work with devices governed by the DMX and digital addressable lighting interface (DALI) protocols and, in the future, may include wireless (RF) as a control option.