With the continuous development of LED technology, the advent of white LEDs has been promoted, and the lighting industry has begun the era of green lighting. LED is a new type of semiconductor solid-state cold light source, which is an optoelectronic device that can convert electrical energy into visible light. Due to the low energy consumption, low heat radiation and high luminous efficiency, LED is a new type of lighting device that is energy-saving, environmentally friendly, economical and safe.
High-power LEDs are to become the main body of the lighting industry, among which safe and efficient drive research is the key to popularizing and applying high-power LEDs. Generally speaking, the power of high-power LEDs is at least 1W or more. At present, the more common ones are 1W, 3W, 5W, 8W and 10W; LEDs called "green light sources" are moving towards high current (300mA ~ 1.4A) , High efficiency (60 ~ 120lm/W), adjustable brightness direction.
temperature
The magnitude of LED forward current also changes 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 aging of the white LED.
Volt-Ampere Characteristics
High-power LED is a low-voltage, high-current driving device. When the LED voltage changes very little, the current changes greatly. When the forward voltage exceeds a certain threshold, that is, the so-called turn-on voltage, it can be approximately considered that IF is proportional to VF.
Light characteristics
According to the light-emitting principle of LED in Changchun Lighting Project, the light-emitting brightness of LED basically changes positively with the current of LED. Controlling the luminous brightness of high-power LEDs is essentially to control its output luminous flux.
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