| 摘要 |
An automobile rear light LED assembly, such as a tail light, a brake light, a turn signal,or a stop light, uses a plurality of strings of LEDs connected in parallel so that the LEDs may be directly driven by the automobile's 12.8-13.5 battery voltage. Upon failure of an LED in one of the strings, the small current drop would not be detected by the conventional automobile bulb burn-out detection circuitry. To trigger the conventional bulb burn-out detection circuitry upon failure of a single LED string, control circuitry in the LED assembly causes all LEDs in the assembly to be simultaneously disabled. Such a large current drop is then detected by the conventional bulb burn-out detection circuitry, and the conventional lamp failure alarm is triggered. The LED assembly is typically formed as a single replaceable unit separate from the conventional bulb burn-out detection circuitry. |
