Quote from: terence on September 24, 2008, 11:49:11 PM
Hi all,

Very interesting topic!Hope to started soon. I'm in the process of collecting parts.

A question though: I read all those people frying inverters, I was wondering, the alternator makes full wave sinus (before rectifying). Isn't it possible to take this wave and step up the voltage with an extra transformer?

Terence


New and reading!

That made me think of something crazy. What if the HV pulse would go into another ignition coil to produce an even higher HV pulse. That could fry things big time.

@gmeast,

I initially designed the inverter to be on/off controlled but limitations inside the 4047 IC made it
impossible to do that. That said, the inverter can still be used as an active charge component in a CDI system.
The inverter frequency is high (approx. 1000Hz) and the output voltage (and max. current) can be changed
by using a different transformer (voltage ratio and size).

Attached is the drawing of my CDI circuit. The CDI system itself is switchable by using a opto coupler controlling the SCR.

I see no problem using this inverter in your circuit If you want a high frequency inverter.
This inverter will eliminate the use of a insulation transformer since it already has an transformer on the output.

[Edit] The components R13, R15, D5, C8 and J8 is not needed for CDI operation. I just need those components
         in my setup so that I can monitor the CDI voltage with my microcontroller.

Groundloop.

Quote from: gmeast on September 24, 2008, 06:55:11 PM
Hi Groundloop,

Can the circuit be switched on and off so it could be used as an active charge component in a CDI system?

Greg

One way I can think of is to add an analog mux chip between the 4047 outputs and the gates of the mosfets.

@insane4evr,

Yes, and also two NAND gates will do. By using NAND gates we ensure
that both transistor gates will be low when not triggered. The two NAND gates
can be triggered from a opto coupler etc.

But do we really need to switch of the inverter? The stand by usage is less than 4 Watt.

Groundloop.

Quote from: Groundloop on September 25, 2008, 10:10:58 AM
@insane4evr,

Yes, and also two NAND gates will do. By using NAND gates we ensure
that both transistor gates will be low when not triggered. The two NAND gates
can be triggered from a opto coupler etc.

But do we really need to switch of the inverter? The stand by usage is less than 4 Watt.

Groundloop.

You are probably right on the low standby power. I am just answering gmeast's question.