Suitable circuit for switching a reversing polarity signal

Thread Starter

orbitcoms

Joined Apr 6, 2017
2
I have an H-Bridge circuit that currently uses physical switched to select the load across the bridge (as attached)

I want to change the switching from physical dip switch to digital. Relays are not feasible because the loads are switched several times a second continuously and will wear out the contacts. The frequency is 125 kHz

It seems SSR will only be useful for switching 240VAC.

Is there a small SMD device that would do want I want? Alternately, owuld something like my circuit "Switched" do the trick?

Thanks
 

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crutschow

Joined Mar 14, 2008
23,542
the loads are switched several times a second continuously and will wear out the contacts. The frequency is 125 kHz
Well, 125 kHz is certainly several times a second (125,000 times per second to be exact), which is way beyond anything a mechanical relay could do.
Is that really how fast you need to switch?
 

dendad

Joined Feb 20, 2016
3,084
A lot depends on what it is you are actually switching.
Like, the signals source,
Signal level,
Load,
More details please.
What are you actually trying to do?
 
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