Re: secondary turn-on

From: Anthony C Smith (acs_at_mapsoncurrentthinking.coom)
Date: 12/07/04 

Date: Tue, 7 Dec 2004 05:06:38 +0000 (UTC)

"legg" <legg@nospam.magma.ca> wrote in message
news:1mf9r05bvscegm753u2pu5pu8klkmcup3m@4ax.com...
> On Mon, 6 Dec 2004 15:19:58 +0000 (UTC), "Anthony C Smith"
> <acs@mapsoncurrent-thinking.com> wrote:

> Whoa. You are driving a common-mode choke with a phase-modulated H
> bridge? The common mode fundamental output component of a phase
> modulator is extremely large.

The choke removes most of the common mode component, the following filter
then only works on the diffential signal.
> Are you sure you are not driving your sources and drains above and
> below their power rails? Is current really zero before the second
> conduction event?
There is currently a 3V overshoot on the bridge output, no undershoot (or
negligable) and all four devices are snubbed with 10R/1n, as well as the cm
choke to reduce ringing. from the data the devices should cope with this
easily-or am I missing something?

scaling of CM Choke- I have scaled the current for the choke at 10A (I need
7A through the choke to drive the audio) as the common mode signal should
result in no net ampere turns does anyone have any experiance with this?

thanks

Anthony

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