| 摘要 |
An electrical circuit for powering a plurality of LEDs, the electrical circuit 5 comprising: a series combination of at least two LED's, an alternative current path in parallel with each LED; a current limiting device; a current regulating device; a current sensing device; and a control circuit that takes its input from the current sensing device and provides input to the current regulating device. The circuit is particularly useful for maintaining a string of diodes and 10 preverable the alternative current path is a zener diode connected across each LED so if the LED goes open circuit, current can still flow through th other LEDs and the current regulating device is a pulse with modulator whereby the average current can be maintained for the remaining LEDs is one or more short circuit. Y:/SPEC/Kossmann LED Aray 140806.wpd 15 August 2006 |
