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These circuits are called trailing-edge dimmers or reverse phase dimming. An even newer, but still expensive technology is sine-wave dimming, which is implemented as a high-power switched-mode power supply followed by a filter. [9] [10]
Leading edge modulation (top plot) uses a reverse sawtooth wave to generate the PWM. The PWM's leading edge is held at the leading edge of the window and the trailing edge is modulated. Trailing edge modulation (middle plot) uses a normal sawtooth wave to generate the PWM. The PWM's trailing edge is fixed and the leading edge is modulated.
Dimming fluorescent ballasts and dimming LED drivers often use 0–10 V control signals to control dimming functions. In many cases, the dimming range of the power supply or ballast is limited. If the light output can only be dimmed from 100% down to 10%, there must be a switch or relay available to kill power to the system and turn the light ...
A first dynamic "local dimming" LED backlight was public demonstrated by BrightSide Technologies in 2003, [33] and later commercially introduced for professional markets (such as video post-production). [34] Edge LED lighting was first introduced by Sony in September 2008 on the 40-inch (1,000 mm) BRAVIA KLV-40ZX1M (known as the ZX1 in Europe ...
LED Neck Light $22 $33 Save $11 It might look silly, but this neck reading light is a great gift for anyone who needs a little extra light for reading or for their evening hobby like knitting ...
The angle between the upper and lower surfaces at the trailing edge is called the trailing edge angle. If the trailing edge angle is zero it is described as a cusped trailing edge. [5] In two-dimensional flow around a uniform wing of infinite span, the slope of the lift curve is determined primarily by the trailing edge angle. The slope is ...
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