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From: Bill Sloman <bill.sloman@ieee.org>
Newsgroups: sci.electronics.design
Subject: Re: LTSpice model for a SiC MOSFET
Date: Thu, 22 May 2025 03:55:41 +1000
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On 22/05/2025 12:41 am, john larkin wrote:
> On Wed, 21 May 2025 12:05:28 +0100, liz@poppyrecords.invalid.invalid
> (Liz Tuddenham) wrote:
> 
>> Bill Sloman <bill.sloman@ieee.org> wrote:
>>
>>> On 20/05/2025 7:58 pm, Liz Tuddenham wrote:
>>>> 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.
>>>
>>> That's a lot of words but doesn't describe anything that takes a small
>>> direct current at high voltage and turns it into larger current at a low
>>> voltage.
>>
>> The original post didn't say that it was a direct current source.  My
>> comment "Depending on supply frequency and required output current."
>> would have given you a clue that I was assuming an A.C. source.
> 
> Bill has informed you that you are stupid. Apologize and be more
> respectful in the future.

John Larkin's advice does tend to be unhelpful.

-- 
Bill Sloman, Sydney