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ZVS Flyback Driver Problem

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LAN_403

Dragon64

Sat Jun 15 2013, 06:09PM

Registered Member #1438 Joined: Sat Apr 12 2008, 12:57AM
Location: Canada
Posts: 218

I built a ZVS driver for my flyback last night however after powering it up, noticed that nothing happened.

When I checked the driver more carefully, I noticed that both mosfets became scorching hot in less that a second of operation with one heating up faster than the other.

From what I checked, all the windings and the connections are correct having double checked it multiple times and using components that should be adequate for running this driver.

Zener Diode = 1N4742A 12V
MOSFET = IRFP250N
Fast Diode = UF4007
Inductor = Unknown Henry
Tank Capacitor = WIMA MKP 4 1000V 220nF (

Powersupply = ~28.7VDC (can supply more than 10A)

Any help will be greatly appreciated!

Alex M

Sat Jun 15 2013, 06:30PM

Registered Member #3943 Joined: Sun Jun 12 2011, 05:24PM
Location: The Shire, UK
Posts: 552

Hi Dragon64,

It looks like your fast recovery diodes are connected wrong.

The diodes need to connect the gates of each MOSFET to the drain of the opposite MOSFET.

Dragon64

Sat Jun 15 2013, 06:48PM

Registered Member #1438 Joined: Sat Apr 12 2008, 12:57AM
Location: Canada
Posts: 218

Well now I feel just stupid :P

Thanks for the help.

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