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Electric voltage withstand capability of PCB layers.

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Techman_7

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I am working on 11kW electric vehicle on-board charger.
With the PFC output voltage (DC link) = 800VDC (considering ripple, peak voltage = 840V), we have made layout such that +VE DC link & -VE DC link are overlapping on layers in multilayer (6 layer) PCB. It forms a PCB capacitor at such high voltages. So, is it recommended or is it fine with such layer structure.

How much voltage the two adjacent layer of FR4 PCB can withstand?
 

Substrate thickness matters. For functional isolation (not safety related), I would use minimal 8 mil (0.2 mm) substrate. Preferably composed of 2 prepreg layers. CAF (conductive anodic filament growth) aware design might require thicker substrate.
 

    Techman_7

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