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transformer question for inverter

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LAN_403

IamSmooth

Tue Oct 05 2010, 02:41AM

Registered Member #190 Joined: Fri Feb 17 2006, 12:00AM
Location:
Posts: 1567

I am hoping someone with a good understanding of transformer theory can explain this behavior.

Part of the stability of a good induction heater would be the ability for the unit to withstand losing the load. I use current limiting. However, I have noticed that when the turn count on the coupling transformer to the series resonant tank has about 17 or less turns, the current waveform unloaded has a lot of ringing at the inverter voltage transition. When I put the load in the current waveform is perfect and clean. If the coupling transformer has more turns AND I have the same current going through there is no ringing.

Does anyone know why this happens? Does it have anything to do with magnetization current? I know I am well below saturation by at least an order of magnitude.

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