METHODS AND APPARATUSES FOR OPERATING GROUPS OF HIGH-POWER LEDS

摘要

An energy-efficient, compact and cost-effective solution for driving a number of high-power LED groups for lighting applications includes using a single switching power supply together with LEDs connected in series and/or in parallel and pulse width-controlled switches in parallel across the individually controllable LED groups. If the switch of an LED group is ON, the LED group will not light up. If the switch is in the OFF position, the full current of the power supply will pass through the corresponding LED group.

主权项

1. A method of driving, by means of at least two power supplies, a number of high-power light-emitting diodes (LEDs), said number of LEDs being divided into two or more groups, each group being separately energizable by a corresponding one of the power supplies, said method comprising:
a) energizing or de-energizing of a supply current from the corresponding one of the power supplies into a first one of the groups; b) waiting during a predetermined wait time period; and c) repeating step a) and b) for a second one of the groups.