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11-12-2008 | 02:15 AM

#218

Futterama

Joined: Nov 2005

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From: Them, DENMARK

RE: Opensource CDI ignition

Hi Uwe,

Look at this link:

http://www.sportdevices.com/ignition/inverter.htm

They claim that the circuit charges a 1uF capacitor at 250 volt in approx. 1 ms.

I couldn't find any recommended transformers for Texas Instruments UC3845 but then I found the Linear Technology LT3750. Linear claim this about the LT3750: "A typical application can charge a 100μF capacitor to 300V in less than 300ms" so I guess it can charge the 0.47µF in less than 3ms. They have several recommendations regarding the transformer: TDK, Sumida, Midcom and Coilcraft. The datasheet contains the part numbers for the recommended transformers.

I ordered a Coilcraft transformer and the LT3750 but I won't have the time to test it anytime soon.

I hope some of this can help you.

Regards,
Martin from Denmark

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