Gerhard Fiedler wrote:
> Martin K wrote:
> 
> 
>>>is there a problem with increasing the PWM frequency of a solenoid driver?
>>>Assuming that the driver itself is fast enough.
> 
> 
>>>I'm not talking about MHz here; I'm just wondering whether increasing the
>>>frequency from originally 30Hz to 1kHz can get me into trouble.
> 
> 
>>I don't foresee any issues. 30Hz seems really low though. 
> 
> 
> That's what I thought, too. It might have been some kind of compromise in
> the original design.
> 
> 
>>By "driver" do you mean the physical solenoid or the electrical driver? 
> 
> 
> I meant the electrical driver (MOSFET and supporting circuits). The idea is
> that the solenoid itself is not following the PWM :)
> 
> Thanks,
> Gerhard

You can watch the voltage across the solenoid (with an oscilloscope) and 
get an idea of what the current is doing, as well. You could put a small 
resistor in series with the inductor and see what the current is, as 
well. Depending on the inductance, the current should smooth out pretty 
quickly with an increased frequency.


-- 
Martin K
http://wwia.org/sgroup/biofuel/
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