Re: LTSpice model for a SiC MOSFET

Bill Sloman <bill.sloman@ieee.org> wrote:

[...]

Capacitive divider using a spare core in the
mains supply lead as one plate of the capacitor?  (Depending on supply
frequency and required output current.)

 
I can't see how that could work.

If you used a three-core mains lead with one of the cores connected to
Neutral at the plug, one to Live at the plug and one floating, the
floating lead would take up a potential somewhere between the other two,
the stray capacitances between the leads acting as a capacitive divider.

The Live and Neutral leads are left unconnected at the equipment end and
the floating lead is connected to a rectifier system which takes it's
earth reference from the equipment being supplied.  It would be
approximately a constant-current supply, so a capacitor and zener diode
would be sufficient to stabilise it at the required low voltage.

The mains lead is acting as a high voltage capacitor but is a lot
cheaper and more reliable.

If you need a solid earth on the output, use a four-core cable.


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~ Liz Tuddenham ~
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