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i see 0.001V at output side across resistor. it was increase & reach to 5V when voltage at input side increase.
I have drive mosfet using ir2110 driver. generate frequency using p89v51rd2.
i have 4 to 5 transformer some i dissemble in smps of computer. so i don't know the polarity so i used...
Flyback Converter-Need Help
hi all,
we are designing flyback converter with following parameter:
input voltage:230V
output voltage:5v
frequancy:70Khz
Diode: Fast Recovery Diode B860
transformer: primary turns:88
secondary turns:2
problem is that switch or transformer get heated when we apply...
I have change MOSFET IRF840 with maximum voltage rating 500.
& also check Vds it was around 300 when i applied 100V. but at that time mosfet getting too hot.
So still no solution. but its batter than last time that i can applied atleast 100V
but we are having 2 to 3 transformer that we are de-assemble from computer sMPS, cell phone charger,
so I assume that in that core there is an airgap.
second thing my MOSFET get heated when i am applying 50-70V its not even reach 100V
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I am also change my frequancy from...
duty cycle i am changing from 20% to 80% using programming.
I am having 4-5 different transformer that what we got from SMPS or Cellphone charger.
One transformer we design by local manufacturer in which there is no airgap(when we de-assemble its winding & core )
we need 2 to 3A on secondary side
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we calculate secondary current 2 to 3 A primary current less than 0.5A but some how current is increase beyond the limit.
wire guage we select is 23 & 27SWG
hi all,
we are designing flyback converter with following parameter:
input voltage:230V
output voltage:5v
frequancy:70Khz
switch MOSFET:IRFP250N
Diode: Fast Recovery Diode B860
transformer: primary turns:88
secondary turns:2
problem is that switch or transformer get heated when we apply...
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