Just an initial thought on an idea that I have had banging around in my head this morning.
It is by no means organised or even correct, but the circuit I have put up might get everyone thinking, and who knows, we might even be able to make something happen.
It is a three stage PSU. Stage 1 : PFC, Stage 2 : Charge up capacitor bank 1, Stage 3 : Charge up capacitor bank 2 from bank 1. It will require that stages 1 and 2 are powered on opposite from each other, providing mains isolation. It would probably be wiser still to have some null time between them.
Process : 240VAC comes in - Rectified - Smoothed - Voltage corrected(PFC) - First set of transistors turn on charging Cap bank 1, and then turn off - Delay - Second set of transistors turn on, charging Cap bank 2, then turn off - Delay - Repeat.
I would think switching frequency would be around 60k ish. PFC could in fact be implemented in the first or second set of transistors to give it less of a component count. Transistors could be totem poled to give more galvonic insulation, and better redundancy.
Something worth thinking about???
Uses - Very high powered audio, or drop the voltage down with PWM for more realistic uses...
PS, sorry for the sketch-up in mspaint.
It is by no means organised or even correct, but the circuit I have put up might get everyone thinking, and who knows, we might even be able to make something happen.
It is a three stage PSU. Stage 1 : PFC, Stage 2 : Charge up capacitor bank 1, Stage 3 : Charge up capacitor bank 2 from bank 1. It will require that stages 1 and 2 are powered on opposite from each other, providing mains isolation. It would probably be wiser still to have some null time between them.
Process : 240VAC comes in - Rectified - Smoothed - Voltage corrected(PFC) - First set of transistors turn on charging Cap bank 1, and then turn off - Delay - Second set of transistors turn on, charging Cap bank 2, then turn off - Delay - Repeat.
I would think switching frequency would be around 60k ish. PFC could in fact be implemented in the first or second set of transistors to give it less of a component count. Transistors could be totem poled to give more galvonic insulation, and better redundancy.
Something worth thinking about???
Uses - Very high powered audio, or drop the voltage down with PWM for more realistic uses...
PS, sorry for the sketch-up in mspaint.
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Can't use semiconductor devices to provide mains isolation - not compliant as an insulation barrier (such as a transformer or opto).
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