Hi all,
I am building the 12V->30V SMPS described here: http://sound.westhost.com/project89.htm
One modification was to include Schottky diodes (SB160) across the gate resistor for faster turn off.
I am also using a single SPP80N06 MOSFET per leg to drive the primary instead of 2 parallel FETs.
However I am getting some strange waveforms at the primary... What's causing this?
If I remove the diode it goes away but then I have a slight overshoot to 40V instead.
Which is the lesser evil?
I am building the 12V->30V SMPS described here: http://sound.westhost.com/project89.htm
One modification was to include Schottky diodes (SB160) across the gate resistor for faster turn off.
I am also using a single SPP80N06 MOSFET per leg to drive the primary instead of 2 parallel FETs.
However I am getting some strange waveforms at the primary... What's causing this?
If I remove the diode it goes away but then I have a slight overshoot to 40V instead.
Which is the lesser evil?
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Hi,
Thanks for all the replies.
I rewound the transformer on a toroid core and the funny waveforms are gone now... Yes good coupling is absolutely essential!
Also I found I had too much output inductance before the smoothing capacitors... realized you don't really need any if the design is unregulated (which it is).
Thanks for all the replies.
I rewound the transformer on a toroid core and the funny waveforms are gone now... Yes good coupling is absolutely essential!
Also I found I had too much output inductance before the smoothing capacitors... realized you don't really need any if the design is unregulated (which it is).
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