I've been tearing down LED light bulb to see how they were driven and found out that most of them use this very simple circuit:
This is my understanding of the circuit:
- 220V AC Input (I'm un Europe)
- 220V DC after the rectifier bridge
- Each LED drops about 6V of voltage. There are 32 LEDs so 32*6 = 192V
- The constant current driver regulates the current and drops the remaining 28V
- (There are actually 2 drivers in parallel but it makes no difference to the concept)
Is that correct? If I want to make a custom circuit where I drive 1 single 36V LED (like a COB), how would I best drop the voltage from 220V to 36V? Using massive resistors?