Add this : leakage currents double for each 10 Centigrades of operating
temperature
Inge
--------------------------------------------------
From: "Paul Edwards" <[log in to unmask]>
Sent: den 3 May 2010 20:01
To: <[log in to unmask]>
Subject: Re: [TN] Question for High Voltage guru's
> Colin,
>
> How close is the nearest ground in your PCB?
>
> How is the HV routed to the exposed metal pad that I assume is Au-plated?
>
> Have built RoHS PCAs with FR-4 type PCB material at +3kv operating and
> found that the leakage path between the HV via and the GND run along the
> glass reinforcing bundles until they plate a circuit and short out the HV
> supply, unless the open air load is a lower resistance path...
>
> Rotate the weave, offset the via grids, bake the laminates and seal the
> PCB...
>
> Paul
>
> Paul Edwards
> Surface Art Engineering
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of colin mcvean
> Sent: Monday, May 03, 2010 12:00 AM
> To: [log in to unmask]
> Subject: [TN] Question for High Voltage guru's
>
> Ladies and Gentlemen of Technet-land,
>
> Let's consider an application based on FR4, originally manufactured on
> ceramic base materials:
>
> It generates a plasma field from the surrounding air, neutralizing any
> airborne particals and nasties!
>
> It operates at around 3KV, for a period of time then resets.
>
> Given passivation layers of FR4 are varied dependant on laminate suppliers
> supply-chain at the time of lamination, then what influence will this
> change have? i.e. Would I expect to see any issues with different copper
> suppliers and passivation types?
>
> note: Qualification testing is under load 20% of the time at 3KV under
> 85/85 damp heat conditions for 1000 hours. It has been qualified on
> original FR-4 samples, but now I'm worried about this potential change
> from my laminate supplier.
>
> looking forward as usual to comments and advice
>
> Colin
>
>
>
>
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