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Resonant Inductor heating

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sabu31

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Hi all,

I use a series-parallel resonant converter for induction heating (from DC supply 36V).
The inductor current is sinusoidal with a peak of 45A. Also, the resonant frequency /switching frequency is 76kHz.The value of inductance used is 10.8uH using 5 turns .

During testing the inductor core temperature is rising to 125 Degrees Celsius.

Is the chosen core suitable or what else can be done to reduce heating?
 

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yes an inductor is needed as a well matched load is mainly resistive with varying levels of inductance - dropping to near zero when the steel being heated ( for example ) gets taken above its Curie Temp ( no longer magnetic )
 

Not obvious at first sight why an induction heater needs a resonant inductor.
Its regarding this inductor (10uH)
--- Updated ---

you want a lower perm core - and a bit bigger, with one or two more turns to get the core losses down ...
Most of the cores I have seen in these (have permeability of 60,90,125). The core used has permeability of 60u
Is there any other work around .
 

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