Injector Driver Module

[Mike Morrin]

At 03:04 PM 8/10/98 -0700, Jose  Rodriguez wrote:
>Mike, thanks for the response.
>
>  Yes, there is the method of doing PWM to hold the injector current. And
that solves the power dissipation problem.
>
>  But it creates a HUGE problem with electromagnetic radiation (EMI),
since the injector coil's current will be switched on/off, creating 6A
peaks and big inductor spikes.
>
>  In order to reduce the EMI, shielded cables, etc etc would be needed,
that could make the module very expensive or not practical.
>

You would have a much smaller EMI problem if you used an inductor on your
driver pcb, with flywheel and smoothing so that the current to the
injectors was DC.

I suspect though that heatsinks are cheaper than inductors.

regards,

Miek