schematic wanted to operate a 240 volt cfl from 12 volts

[mark krawczuk]

hi, can any bod point me in the right direction for a HIGH efficency
schematic to operate a 240 volt cfl (s) of 12 volys ?

i`ve had a bit of look on the net , but nothing much ..
thanks,'
mark k

 

[Trevor Wilson]

"mark krawczuk" <krawczuk@adam.com.au> wrote in message
newsc6dnQPQsoUDIZ_UnZ2dnUVZ_gadnZ2d@adnap.net.au...

hi, can any bod point me in the right direction for a HIGH efficency
schematic to operate a 240 volt cfl (s) of 12 volys ?

i`ve had a bit of look on the net , but nothing much ..
thanks,'

**Why re-invent the wheel? Browse your Jaycar catalogue for some cheap
inverters.


--
Trevor Wilson
www.rageaudio.com.au

 

[ian field]

"mark krawczuk" <krawczuk@adam.com.au> wrote in message
newsc6dnQPQsoUDIZ_UnZ2dnUVZ_gadnZ2d@adnap.net.au...

hi, can any bod point me in the right direction for a HIGH efficency
schematic to operate a 240 volt cfl (s) of 12 volys ?

i`ve had a bit of look on the net , but nothing much ..
thanks,'
mark k

CFLs aren't that fussy, they want 240V RMS which charges the internal
capacitor to about 320V or so and they don't need a lot of current so you
can probably get away with a basic blocking oscillator.

As a rough guestimate, make the collector winding about 18T, the base
winding about 12T and a secondary around 200 - 300T, use a ferrite toroid or
pot core just big enough to take the windings and experiment until it works
as you want it.

You will need to provide the inverter with its own fast rectifier as the
pulse waveform will be too fast for the bridge rectifier in the CFL.

 

[kreed]

On Oct 25, 4:28 pm, "mark krawczuk" <krawc...@adam.com.au> wrote:

hi, can any bod point me in the right direction for a   HIGH efficency
schematic to operate a 240 volt cfl (s) of 12 volys ?

i`ve had a bit of look on the net , but  nothing much ..
thanks,'
mark k

you can actually buy 12 and 24v CFL's at Bunnings, (and probably other
major lighting shops). Whether they are available in the wattages,
colour types, and shapes that you want is another matter.

These are likely to be as efficient as it gets, as then you only have
a single stage involved, rather than having an inverter, AND the
switching circuit inside the existing CFL ?

Oatley electronics were also selling them some time back, and also
published (and sold) a kit that does exactly what you want, if you
arent happy with the 12v CFL idea.