With the continuous development of LED technology and the advent of white LEDs, the lighting industry has begun the era of green lighting. LED It is a new type of semiconductor solid-state cold light source, which is an optoelectronic device that converts electrical energy into visible light. Because LED has low energy consumption, low heat radiation and high luminous efficiency, it is a new type of lighting device with energy saving, environmental protection, economy and safety. Therefore, accelerating technical research and improving its luminous efficiency have become the primary problems.
High-power LEDs must become the mainstay of the lighting industry. Safe and efficient driving research is the key to promoting the application of high-power LEDs. In general, high-power LEDs have a power of at least 1W. Currently, 1W, 3W, 5W, 8W, and 10W are commonly used; LEDs called "green light sources" are moving toward high currents (300mA to 1.4A). High efficiency (60 ~ 120lm / W), the direction of adjustable brightness.
temperature
The magnitude of the LED forward current also varies with temperature. Once the ambient temperature exceeds a certain value, the allowable forward current of the white LED will be greatly reduced. In this case, if a large current is still applied, it is easy to cause the white LED to age.
Voltammetric characteristics
The high-power LED is a low-voltage, high-current driving device. When the LED voltage changes very little, the current varies greatly. When the forward voltage exceeds a certain threshold, commonly referred to as the turn-on voltage, it can be approximated that IF is proportional to VF.
Optical characteristics
According to the principle of LED illumination, the luminance of the LED changes substantially with the current of the LED. Controlling the brightness of a high-power LED is essentially controlling its output luminous flux.
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