Lowering your leakage inductance will help some.

Electron <electron2k4@infinito.it> wrote:

>
>Hello,
>I have a PIC-based boost switch-mode power supply that is working great,
>but unfortunately it emits quite some RF, every time it's switching.
>
>I have thus decided to use a snubber, are there any good engineering
>practices, or interesting tricks to follow?
>
>I guess there's very little I can do on the PIC software side, strategy
>wise, as the problem is inherent in the boost topology.. i.e. the voltage
>has to rise a lot so that the inductor can add some energy to an already
>nearly fully charged capacitor.
>
>The bad thing is that if I make each switching slower, I will dissipate
>energy in the switching transistor. If I use a snubber, I will probably
>dissipate the same energy there. It's not even going to be much useful
>to lower the switching frequency, as the trouble (interference) I'm gettin=
g,
>is coming from every switch event. Also I cannot change the cable, to
>isolate the wires of the sensor from the wires that carry the interference
>(the wires that go into the inductor (a stator actually)).
>
>Thanks for any hints,
>Mario
>
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