> -----Original Message-----
> From: Vasile Surducan [SMTP:vasile@S3.ITIM-CJ.RO]
> Sent: Thursday, January 16, 2003 12:58 PM
> To:   PICLIST@MITVMA.MIT.EDU
> Subject:      Re: [EE]:  zenner in parallel and coil current
>
> On Thu, 16 Jan 2003, Roman Black wrote:
>
> > Michael Rigby-Jones wrote:
> >
> > > You cannot do this with an igntion coil, the whole system relies on
> the
> > > current in the primary of the ignition coil collapsing as quickly as
> > > possible in order in create the required voltage in the secondary.  By
> > > clamping the primary voltage to the supply rail the rate of change of
> > > current will be greatly slowed, along with a corresponding descrease
> in
> > > secondary voltage.
> >
> > Better still to read up on CDI and make a CDI ignition
> > coil driver. This also has performance advantages. :o)
>
> what is CDI ( in full english ...) ?
>
Capacitive Discharge Ignition.  Instead of relying on the flyback in the
primary of the coil providing enough voltage, a high frequency inverter
charges a capacitor to several hundred volts.  The capacitor is then
discharged into the igntion coils primary to provide the spark.

Regards

Mike


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