I need help with choosing DC/DC converter parts.
I want to build D-size battery powered lantern working with typical E14 or E27 compact fluorescent lamps.
Here is my awesome idea :)
It will be supposed to work on D-size NiMh or Alkaline batteries.
Typical compact fluorescent lamps work normally with DC (there is rectifier bridge at the input anyway). I was experimenting with some old compact lamps and most of them start at 80V DC. All lamps I tried work normally at 100V DC.
I've been messing around with some low voltage easy to use converters (like step-down LM2574), I have oscilloscope, I'm able to tune-up simple converter efficiency for specyfic load needs. However I'm not inverter expert, I don't know integrated chips to build such thing.
at least 10Wabout 4W due to D-size alkaline capabilities
efficiency at least 80%
minimum input voltage 4V (3.2V would be awesome)
output voltage 110V (it may be 230V)
not complicated (i need to build this in a week - gift for sister)
The question is:
Are there any easy to use parts to build affordable DC/DC 3...7V to 110V converter?
It may be 4V, I wrote 3V because its possible to deep-discharge alkalines to 0.8V, thats 3.2V with 4 cells.
I know that LED lamps are more efficient, I'm considering using them too, but I want to stick to "typical home light sources".
I saw alkaline D discharge charts, it looks like single D size Duracell Procell can deliver 1W for 5 hours.
GP 700DH NiMh battery with 7Ah capacity can deliver much more power (14A discharge for 30 minutes or 7A for 1hour).