Re: [Amps] Equalising resistors with HV diodes

[R.Measures <r@somis.org>]

On Sep 21, 2004, at 1:23 AM, R.Measures wrote:

> On Sep 21, 2004, at 12:30 AM, peter.chadwick@Zarlink.Com wrote:
>
> > Rich's argument appears to me that because the current is the same in 
> > each
> > diode, and each diode goes into avalanche, the voltage distribution 
> > on any
> > one diode can't be such as to exceed the the reverse leakage current 
> > rating
> > of that diode.
>
> -  Only if the total PIV of the diode string exceeds the actual 
> voltage encountered on the job
> .
> > Now that leads to an interesting question: suppose you have
> > a 1 kV diode in series with a 200v diode, and that the capacitances 
> > are
> > equal.
>
> -  If the junction capacitance at 200v on one diode equals the 
> junction C of another diode at 1000v, the die of the 200v diode must 
> be much larger than that of the other diode.

Bzzzzzzzt.  I should have said ... ... the die of the 1000v diode must 
be much larger.

 Richard L. Measures, AG6K, 805.386.3734.  www.somis.org

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