High Voltage Flyback Supply

139

02:00:49

A high voltage supply I'm working on.
ETD34 N87 core with 0.2mm gap
40W out at 2,000V, for mains 240V operation.

published 10 years ago

hurz

10 years ago

Isn't the power dissipation at the back emf 1kOhm not to high? If i calculated correctly its above 120Watt!

Chryseus

10 years ago

@hurz I changed the component values to be more sensible and added the secondary rectifier and cap, the simulation isn't entirely accurate since significant energy is stored in the gapped ferrite core so the power dissipation won't be that extreme, I'm not entirely sure if a snubbing network will be needed, I had some decent results with my first test at 200V DC but that was before I increased the number of primary turns.

Chryseus

10 years ago

Seems like a snubber is needed, I'm hitting 800V across the switching transistor at 190V AC input, the output is quite impressive although I had to rewind the primary after the insulation started to break down.

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