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Registered Member #1232
Joined: Wed Jan 16 2008, 10:53PM
Location: Doon tha Toon!
Posts: 881
> I don't see how the series feed setup would reduce the current through the capacitors compared to a LCLR: it'll be just about the same.
I'm guessing that Hernan is using more inductance and less capacitance in his series resonant circuit than in his previous parallel resonant circuit (LCLR arrangement.) The workpiece only cares about ampere-turns, so if you achieve your ampere-turns with lots of turns instead of lots of amperes then the tank capacitor has an easier life in terms of the required current handling. The problem is now that it has to deal with a higher voltage, so you are partly trading dielectric losses for conduction losses. In the case of an MMC-type construction you also have less parallel strings, so even though the current is reduced it probably gets just as hot!
Obviously you can design the parallel resonant and series resonant circuits to have any characteristic impedance that you want. In general though, I think series resonant networks are designed for a higher characteristic impedance at resonance than parallel resonant circuits, so the ciculating currents may be lower. The lower characteristic impedance of the parallel resonant network at resonance is "inverted" by the action of the L-match network in the LCLR arrangment so they both appear like series resonant networks to the driving voltage source anyway.
Registered Member #95
Joined: Thu Feb 09 2006, 04:57PM
Location: Norway
Posts: 1308
Very neat Hernan! I'm inspired to start working on my heater again. Btw, haven't you already tried and modified my PLL driver before? It hasn't let you down has it?
Registered Member #1614
Joined: Wed Jul 30 2008, 03:08PM
Location: Argentina
Posts: 52
I'm using more turns coil. it's inductance is about 4.6uHy because capacitance is low 0.175uF aprox. yes Richie, I meant more turns and less amps I didn't express the concept clear . we can achieve the same results with both circuits it only depends what is at hand.
I like series because workcoil is some distance away from caps at expense of stray inductance.
thanks Eirik , Yes I tried your PLL driver with some modifications on it to suit my needs. It works exellent!
basically I would need to change some things and it must stay locked when inverter current be almost in phase with Inverter voltage . correct me if I'm wrong.
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tank capacitor contruction for induction heating
