Author Topic: Mazilli ZVS Driver Modification Problems  (Read 3001 times)

Offline davekni

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Re: Mazilli ZVS Driver Modification Problems
« Reply #40 on: May 12, 2020, 06:03:17 AM »
When using ferrite cores for inductors (as opposed to transformers), they always need gaps to reduce effective permeability.  Otherwise the core is almost always saturated.  45kHz is a good frequency for PC40 material - looks like it's intended for roughly 25kHz-100kHz, although could be used a ways outside that range.

Don't worry about too-hot-to-touch.  PC40 is designed for 80-100C operation, with lowest loss at 90C.  If it's getting over 100C, then it's time to back off.  Most ferrites designed for power applications are designed to run hot (designed with minimum power loss at ~100C).

Do you have a scope?  Or, how are you measuring frequency?  If you have a scope, adjust your inductor gap until the inductor has half the voltage of the work coil with nothing inside the work coil.  Then your inductor is half of the work-coil's inductance.

You mentioned 900kHz!  That's impressive for IGBTs!  They are probably not too efficient at such high frequencies.
David Knierim

High Voltage Forum

Re: Mazilli ZVS Driver Modification Problems
« Reply #40 on: May 12, 2020, 06:03:17 AM »

 


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