You do know unmodified induction motors can work as generators? You need externalpower to bootstrap, but otherwise they can be used this way with a smart controller
The point is most switching designs assume a constant voltage source, not a highly inductivedynamo winding / rectifier network. You probably need to establish a good DC rail withsubstantial capacitance on the input side rated for lots of ripple current.You do know unmodified induction motors can work as generators? You need externalpower to bootstrap, but otherwise they can be used this way with a smart controller.
Actually, the point is that a switch mode regulator -requires- an inductance.It sounds to me like perhaps what he needs is more akin to a current regulated switch mode regulator, like what is used in a chopper stepper driver. In which case you -don't- smooth the PWM output.But he clearly thinks he knows much more than any of us, so I just want to see the video of the first time this is "fired" up.
The links you gave earlier were for RC lowpass. An RC lowpass filter on PWM will give -just- as much in losses as a linear regulator.
Nope, I'm just looking forward to a video of the resulting explosion. That'll be appropriate recompense for the insults I've received.
Why wouldn't an N-channel mosfet work on the high side of a load? P channel has current flowing from source to drain, and N channel has current flowing from drain to source.. I don't understand why you couldn't put the load on whatever side of the N-channel mosfet you want and have it work.. weather the load is connected to the drain or source.. the only way for current to flow through the load is to have the gate triggered. Can someone explain this why you need to have the load on a specific side of the mosfet?
These things have been used all over the world where grid power is not available, especially in poor countries.
QuoteThese things have been used all over the world where grid power is not available, especially in poor countries.Poor countries like Norway and Vancouver Island and Fiordland and anywhere else you got permanent water flowing off a cliff.
Yeah, you could have N-type mosfets on both the low side and high side of the load.But here's the problem. The N-type mosfet works by manipulating the voltage between the gate and the source. On the low side, when the mosfet is being used as a switch, or in an H-bridge type circuit, the source is the ground level or low-side DC level. It is easy to organise the gate voltage Vgs in relation to the low-side source potential.If you put the N-type mosfet on the high side, then the source voltage of the mosfet, is what ? Varies all the time. It's hard to set a gate voltage relative to it. Possible, but difficult.The P-type mosfet has it's gate voltage set with respect to the source, which, in the high side position, is the high voltage dc supply. Setting the gate voltage with respect to that, is more straightforward.