minisystem
Newly Enlightened
- Joined
- Jul 12, 2011
- Messages
- 96
Just pondering...
Most of the designs I've seen posted for dynamo LED lights take the rectified, smoothed output of the dynamo and dump it into two or more LEDs. Current regulation is handled by the fact that the hub saturates at below the maximum current the LED can handle (ie. there is no active current limiting circuitry). With 2 3V white LEDs in series your combined Vf is 6V, right? That just happens to be the rated voltage fo the hub, which we all know is really dependent on the load.
So, let's say I want to make a light that just uses a single white LED with a Vf of 3.0V or so. Based on my understanding of the way the hub saturates and how its voltage output is load dependent, I can't see how a single power LED could come to any harm. Am I missing something?
Most of the designs I've seen posted for dynamo LED lights take the rectified, smoothed output of the dynamo and dump it into two or more LEDs. Current regulation is handled by the fact that the hub saturates at below the maximum current the LED can handle (ie. there is no active current limiting circuitry). With 2 3V white LEDs in series your combined Vf is 6V, right? That just happens to be the rated voltage fo the hub, which we all know is really dependent on the load.
So, let's say I want to make a light that just uses a single white LED with a Vf of 3.0V or so. Based on my understanding of the way the hub saturates and how its voltage output is load dependent, I can't see how a single power LED could come to any harm. Am I missing something?