[DeTomaso] PWM Power Supplies

[Dave Londry]

That's the standard way of doing a variable-speed drive for a DC motor, Ken.
You need to know what base frequency the motor likes,
 and then you vary the duty cycle from 100% off to 100% on to control 
the speed.
(because they generally don't like it when you just turn down the voltage)
Microcontrollers generally have PWM output hardware,
 but any processor can do the low frequencies you use on motor drives.

- positive square wave makes sense
- battery voltage amplitude makes sense
- 20 degrees sounds like it's 20/360 = 5.5% duty cycle, which should be 
the variable part.
Is there a manual for it online?
dave

-- 
Dave Londry
Embedded Spaces Inc. (ESI)
davel at emspace.com

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Ken Green wrote:
> Guys,
>  
>     Just in case someone is familiar with these, I have MSD PWM power suppy.  I'd like to use it to control an electric water pump, maybe fuel pump, water/alcohol pump.  The MSD Tech guy said the control signal interface is:
>  
> "a positive square wave, 20 degree duration at battery voltage amplitude"
>  
> Is this a basic type of signal that I can get a processor to generate for general use?
>  
> Ken
>  
>