LOW-POWER LED LIGHTING APPLICATIONS: A POWER-MANAGEMENT TECHNIQUE

摘要

When a set of LEDs is controlled, LED luminousity versus electrical power is a key specification in determining the quality of visible light. In low-power applications, illuminating an entire set of LEDs simultaneously to achieve the maximum luminous level may not be possible, due to the limited current source. The power dissipation per LED must be managed efficiently, to produce optimum luminosity from the low-power source. This requires a power-management technique where, in a set of LEDs, only one bank of LEDs is powered for a given time. This time interval is managed to achieve the required luminous intensity, without visually detecting the alternating banks of LEDs.