Boost converter noise problem

[CyBeRbLaK]

Hi,

I'm currently testing a high-power interleaved boost converter (5kW) that is used to charge batteries. I reduced the wire lengths in order to minimize the radiated noise from the switching operation (20kHz). However, the MOSFET's turn-off transient is giving me a lot of pain. I use a RCD snubber to reduce the voltage spike, but this spike is still getting in my gate signals. This, as you can guess, is creating a lot of trouble. Any idea about how to minimize this noise?

Thanks

Alex