Fluorescence
Electrical
- Oct 19, 2008
- 42
Hi,
I am thinking about how to do a light bulb (~10W) with LEDs.....
Being offline, the SMPS would need to go in the base, where it would be unventilated and very hot since its above the bulb itself.
The heat is thus the biggest problem.
Since electrolytic caps are the most heat sensitive components that will be used, it is essential to keep the number (size) of electrolytics down.
As such, considering the heat, and the need to keep few electrolytics, it is easier/better/cheaper to do an SMPS converter for a CFL than for a LED bulb....
This is because the CFL does not need smooth DC for operation.....but just requires rectification, one small electrolytic to smooth the DC bus, then two transistors to switch this into a transformer, the output going straight to the fluorescent lamp. -just one electrolytic on the DC input bus is used.
It would be impossible to do a LED lamp of similar wattage using so few electrolytics ?
Have i found the reason why LED light bulbs will never compete with CFL's ?
I am thinking about how to do a light bulb (~10W) with LEDs.....
Being offline, the SMPS would need to go in the base, where it would be unventilated and very hot since its above the bulb itself.
The heat is thus the biggest problem.
Since electrolytic caps are the most heat sensitive components that will be used, it is essential to keep the number (size) of electrolytics down.
As such, considering the heat, and the need to keep few electrolytics, it is easier/better/cheaper to do an SMPS converter for a CFL than for a LED bulb....
This is because the CFL does not need smooth DC for operation.....but just requires rectification, one small electrolytic to smooth the DC bus, then two transistors to switch this into a transformer, the output going straight to the fluorescent lamp. -just one electrolytic on the DC input bus is used.
It would be impossible to do a LED lamp of similar wattage using so few electrolytics ?
Have i found the reason why LED light bulbs will never compete with CFL's ?