cupoftea
Advanced Member level 6
Hi,
We are doing an 2kW LLC converter using PM6249 transformer core from Epcos. We are using an external resonant inductor (and additional external magnetising inductor). We will interleave wind the transformer. However, we will still get some leakage inductance as you know. We don’t want any leakage L as it will add to the external resonant inductor and reduce the upper resonant frequency. So, We have to put up with this, but would therefore like to know exactly how much leakage inductance we are going to get. As such we wish to gap the core (every one), to exactly the same amount…..then we will get the same leakage L from each one, and can then deal with it.
Are there any exact-thickness spacers available for core gapping? We need approx. 0.3mm, and exactly same each time…….even if its 0.32mm etc etc.
We don’t want to machine gap the cores as custom gapping costs a fortune, and adds to lead time.
PM6249
We are doing an 2kW LLC converter using PM6249 transformer core from Epcos. We are using an external resonant inductor (and additional external magnetising inductor). We will interleave wind the transformer. However, we will still get some leakage inductance as you know. We don’t want any leakage L as it will add to the external resonant inductor and reduce the upper resonant frequency. So, We have to put up with this, but would therefore like to know exactly how much leakage inductance we are going to get. As such we wish to gap the core (every one), to exactly the same amount…..then we will get the same leakage L from each one, and can then deal with it.
Are there any exact-thickness spacers available for core gapping? We need approx. 0.3mm, and exactly same each time…….even if its 0.32mm etc etc.
We don’t want to machine gap the cores as custom gapping costs a fortune, and adds to lead time.
PM6249