On 02/01/2015 09:35, RussellMc wrote:
> Questions:
>
> How common is this?
>
> Any examples?
>
> What sort of performance gains are realised in practice for DC and AC
> switching?
>
> Why is it a bad idea compared to alternatives?  / What have I missed?
>
>
>
>          Russell


Russel,


The idea seems good and I don't see many drawbacks apart the extra
complexity and cost of having two different power devices plus a
dedicated control unit.

It is not the exact same thing, but I use a small DPDT relay to revert a
DC motor that consumes 1.5A and a MOSFET to turn it on/off. The relay is
rated at 1A continuous but can carry up to 3A when not switching. What I
do is always switch the relay when the transistor is off and allow
enough time for the relay to settle.  So far the relays are doing well.


Isaac



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