Re: [Amps] HV Diodes

[KA4INM radio <ka4inm@gmail.com>]

On 10/08/14 06:35, Chris Wilson wrote:

  When companies pot a string of 1N4007's (1 kV at 1 Amp) they rate the 
string at .75 Amp.  The diodes, lacking the posts or copper foil to act 
as heat sinks, run hotter when potted.  Short leads to the circuit board 
copper conduct heat away from the silicon die better than long leads.
> Hello Han,
>
> On Wednesday, October 8, 2014,  you wrote:
>
> > hi George-san and all
> > I think HV6-1 is equivalent to GI HVPR10-MX12.
> > I have measured forward voltages of these diode modules
> > using a CVCC power supply with 100-mA current.
> > Assuming each of the diode in a string exhibits 0.7 V forward
> > voltage one can presume how many series diodes are in
> > the module.
> > GI HVPR10-MX12 6.36 V: 9 diodes
> > EDHD 15k 10.67 V per a leg: 15 diodes x 2 (which I am using)
> > SEMITECH KV-PAC SDHD-15k 12.97 V per a leg: 18 diodes x 2
> > Toshiba S5166A (13 kV 500 mA) 14.0 V: 20 diodes
> > I think 10 x 1kV 1A diodes in series is OK as an alternative.
> > de Han JE1BMJ
> Has  anyone  experimented  with  home "potting" diode strings to make
> their  own  blocks?  I  am  curious  about diode lead length, physical
> orientation, and potting compound used. thanks.
--
  Ron  KA4INM - Youvan's corollary:
                Every action results in unwanted side effects.
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