Uni SMPS 300W
- Thread starter Acca
- Start date
Hello,Picture of feedback transformer is given in first page.
Any wire can be used.I use small wire from UTP cable.
New SMPS
Here's my new SMPS with FET's.It's used to power my laptop but can be used for any purpose.It has short circuit protection (tested) and can give up to 300W power with E33.You can use bigger transformer and more power FET's for higher power.Changing 47R will change frequency.In few days I'll make freq. meter and measure frequency.For GDT I use R16 toroid core,but can be used any core without gap (E16,E25,etc.)
If use E16 wind 3x28 turns.D6 is diac,and two diodes in gate is two Zener 16V 1,3W in series,such as in schematic,or if you have TVS you can use it (must be from bipolar series).Input filter,NTC and rectifier ommited for simplicity.I didn't used filter
PAY ATTENTION WHEN WORKING WITH HIGH VOLTAGES SUCH AS 310VDC OR 220VAC.IT'S DEADLY!
Schematic and pictures in attachment:
Here's my new SMPS with FET's.It's used to power my laptop but can be used for any purpose.It has short circuit protection (tested) and can give up to 300W power with E33.You can use bigger transformer and more power FET's for higher power.Changing 47R will change frequency.In few days I'll make freq. meter and measure frequency.For GDT I use R16 toroid core,but can be used any core without gap (E16,E25,etc.)
If use E16 wind 3x28 turns.D6 is diac,and two diodes in gate is two Zener 16V 1,3W in series,such as in schematic,or if you have TVS you can use it (must be from bipolar series).Input filter,NTC and rectifier ommited for simplicity.I didn't used filter
PAY ATTENTION WHEN WORKING WITH HIGH VOLTAGES SUCH AS 310VDC OR 220VAC.IT'S DEADLY!
Schematic and pictures in attachment:
Last edited:
so i need 120 turns for 60 volts???
something else...
i want ot parralel three ei33 transormers...
will i have any problem if i conect the primaries in parallel/?
i want to use two pairs of mje13009 transistors too...
in order to do it i need a pair of diodes (colector-emiter) for every pair of transistor or oen for both transistors?
something else...
i want ot parralel three ei33 transormers...
will i have any problem if i conect the primaries in parallel/?
i want to use two pairs of mje13009 transistors too...
in order to do it i need a pair of diodes (colector-emiter) for every pair of transistor or oen for both transistors?
Yes,with one core (this is reason because I use E33)
Bipolars can't used in parallel.
For more power I recommend to use schematic from post #44 (This is most reliable self osc. SMPS in my home)
It canu use Fet's in parallel.
Instead R16 you can use E16 or E19 without gap,3x28 turns.
Bipolars can't used in parallel.
For more power I recommend to use schematic from post #44 (This is most reliable self osc. SMPS in my home)
It canu use Fet's in parallel.
Instead R16 you can use E16 or E19 without gap,3x28 turns.