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Help me charge the coil with VSI and DC chopper

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efic

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Hi,
I'm trying to charge a large (Superconductore) coil with Voltage Source Inverter and a DC chopper. the current in the chopper is very large, much higher than the current that in the VSI. I'm charging the coil in a PWM signal.
My question is:
How can I charge the coil without let the high coil current be connected to the VSI.
Also it will be very helpful if any one can refer me to a detailed stuff about choppers.
Thanks
 

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