Downstream includes LED chip packaging and testing and applications. LED package refers to the LED Lighting china outer leads connected to the electrodes of the LED chip, the LED device is formed, to protect the LED chip and the package plays the light-extraction efficiency effect. Downstream encapsulation process order: chips, solid crystal, adhesive, wire, resin package, long-grilled, tinned, shear pin, testing.
The LED is a light emitting tube having a diode characteristic, it is energized in one direction only. LED light output is generally proportional to the current through the LED, the white LED large current saturation occurs, the luminous efficiency greatly reduced, or even failure, the LED current can not exceed its specification using rating. In addition, LED light output is inversely proportional to temperature, so the power supply should minimize the use of well-designed heating and cooling system.
DC current LED drivers are used, and therefore required between the mains and the LED plus a power adapter that LED drive power. Its function is to convert AC power into the appropriate DC LED. According to the rules of the electricity grid and LED driving characteristics required in the selection and design of LED drive power to take into account the following points:
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