Dear Forum,
I am a newbie here... lem me as some questions about the induction heating:
So suppose I have a source of an alternating current of some frequency.
I have a load (parallel resonant LCR circuit).
The frequency of the source matches the frequency of the parallel LCR circuit's resonant frequency. So I have a resonance in my circuit - this means that the voltage accross my parallel circuit is in phase with the current that source is supplying. In this case the power factor of the circuit - Cos(phi)=1 since angle phi is zero.
But when I instert a workpiece into the coil of my LCR circuit... the workpiece affects the inductive characteristics of the coil.. hence changing its unductive resistance (may be also some other parameters) and all this finally changes the resonant frequency to some other frequency. And since my source is working with constant old frequency - I am out of resonance (there is some non-zero degree between voltage and current) so the Cos(phi) is less than one and my power factor is worse.
So to mitigate this problem the "L-Matching" component is intorduced.. with the FINE TUNNING of the matching network (matching coil) it is intended to reduce the angle difference between the feeding voltage and feeding current of my load (LCR)... hence rising Cos(phi) as possible to 1 to match again the resonant condition.
Is my undesrtanding correct ?
Thank you very much for your assistance...
I am a newbie here... lem me as some questions about the induction heating:
So suppose I have a source of an alternating current of some frequency.
I have a load (parallel resonant LCR circuit).
The frequency of the source matches the frequency of the parallel LCR circuit's resonant frequency. So I have a resonance in my circuit - this means that the voltage accross my parallel circuit is in phase with the current that source is supplying. In this case the power factor of the circuit - Cos(phi)=1 since angle phi is zero.
But when I instert a workpiece into the coil of my LCR circuit... the workpiece affects the inductive characteristics of the coil.. hence changing its unductive resistance (may be also some other parameters) and all this finally changes the resonant frequency to some other frequency. And since my source is working with constant old frequency - I am out of resonance (there is some non-zero degree between voltage and current) so the Cos(phi) is less than one and my power factor is worse.
So to mitigate this problem the "L-Matching" component is intorduced.. with the FINE TUNNING of the matching network (matching coil) it is intended to reduce the angle difference between the feeding voltage and feeding current of my load (LCR)... hence rising Cos(phi) as possible to 1 to match again the resonant condition.
Is my undesrtanding correct ?
Thank you very much for your assistance...