Pravin Gosavi
Member
Hi all. I am building a mini cfl inverter using SG3525.
The selected frequency is 50 KHz. And I have winded the transformer. I found it in an old inverter. So I don't have its parameters but I could measure Ac wiz 0.75 cm^2.
So Ac= 0.75, frq= 50KHz, Bmax= 1500(?) Vin= 10.5V Vout= 220V
So N(Pri)= 6 and N(sec)= 128
So my problem is I get 250 V at OP when no load and current drawn is .33A. When I connect a cfl (20W) It glows for like half a sec and then suddenly output goes 0 V and current remains 1.15 amps. Sometimes CFL glows 'forever' (Vtg falls to 220V and Mosfets get heated). And then also current is 1.15 amps. But most of the times this doesn't happen. And everything gets heated.
Where is the problem??
I have winded transformer for the first time. Is there any mistake I may have made?
I am using P55 mos.
Plz help me.
The selected frequency is 50 KHz. And I have winded the transformer. I found it in an old inverter. So I don't have its parameters but I could measure Ac wiz 0.75 cm^2.
So Ac= 0.75, frq= 50KHz, Bmax= 1500(?) Vin= 10.5V Vout= 220V
So N(Pri)= 6 and N(sec)= 128
So my problem is I get 250 V at OP when no load and current drawn is .33A. When I connect a cfl (20W) It glows for like half a sec and then suddenly output goes 0 V and current remains 1.15 amps. Sometimes CFL glows 'forever' (Vtg falls to 220V and Mosfets get heated). And then also current is 1.15 amps. But most of the times this doesn't happen. And everything gets heated.
Where is the problem??
I have winded transformer for the first time. Is there any mistake I may have made?
I am using P55 mos.
Plz help me.