Very high gain transformerless boost converter - is it possible

The wheel drive on my snow blower works like that.. rubber disc and rubber rimmed driven wheel. It works the same way with the disc always spinning.

George H.

Hey guys. I made a simulation of the 2 stage boost converter idea using LTS pice. The simulation shows an efficiency of 91% with 120 Watts output power at a nominal 400 volt output. I selected capacitors, diodes and MOSFETS fo r each of the boost stages but haven't selected the inductors yet. Let me k now what you think, is this efficiency too good to be true? here is the lin k to the LTSpice schematic:

This is a school project for me and i don't need to actually build it but i t would be very fun to actually prototype it. There's more i have to do but i'll get onto that next with your advice again.

TSpice. The simulation shows an efficiency of 91% with 120 Watts output pow er at a nominal 400 volt output. I selected capacitors, diodes and MOSFETS for each of the boost stages but haven't selected the inductors yet. Let me know what you think, is this efficiency too good to be true? here is the l ink to the LTSpice schematic:

it would be very fun to actually prototype it. There's more i have to do b ut i'll get onto that next with your advice again.

capacitor C11 is:

Here's your 2-stage boost with Win's idea of using a single controller chip:

Thanks heaps I'll look at it tomorrow