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Subject: Re: Simple adjustable 0 - 400V regulator, with flaw
Date: Sat, 18 Jan 2003 17:47:52 +0000
X-Newsreader: Forte Agent 1.93/32.576 English (American)
Winfield Hill wrote:
>. +480V ___ HIP5600
>. ---| |---+---+-----------(O) HV out
>. |___| | |
>. | | 1.5k
>. | | | adjust, 0 - 400V
>. '---- | --+----o->o--------,
>. | o--, |
>. 10uF === 300V | 500k
>. 450V | fixed | pot
>. | 380k |
> The switch allows one to select a fixed 300V output, or to
> adjust the voltage to any value between 1.2 and 400 volts.
> But this circuit has one potential problem that can cause
> a component failure. As a design quiz, tell us what the
> problem is, and find a solution that doesn't significantly
> affect any of the circuit's functionality.
Well I will assume it is the capacitor which can see 480v during switch
changeover (The 1k5 and pot also get hammered but given no specification I
assume they can take it).
The capacitor solution
If that isn't clear - leave the pot in circuit and either ground the wiper
or a parallel 1M5 resistor.
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