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Ignition signal too low

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CallensAlec

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Post 24 May 2017, 11:21

Ignition signal too low

We're having issues with our ignition signal.

When nothing is connected to the IGN_OUTx output, we get a clean 5V ignition signal when starting. When connecting the igniter board to the IGN_OUTx output, the voltage drops to 1,93 V, but the signal remains, if measuring from the Coil x outputs on the igniter board going to our DIS coils, we only have about 0,40V left, but still with the signal in it. This is not enough to have a spark for us unfortunately.

Has somebody here already come across this problem or knows how to fix it? We are out of ideas at the moment.

Thanks in advance!
Attachments
Signal going to coils
Signal measured from IGN_INx on igniter board
Signal with nothing connected to IGN_OUTx
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STC

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Post 24 May 2017, 20:53

Re: Ignition signal too low

When connecting the igniter board to the IGN_OUTx output, the voltage drops to 1,93 V, but the signal remains,

It is normal, because BIP373 consumes some current into base-emitter. It is like a Darlington transistor. 1.92V is base to emitter voltage for BIP373.
bip373-saturation.png
bip373-saturation.png (7.92 KiB) Viewed 295 times


if measuring from the Coil x outputs on the igniter board going to our DIS coils, we only have about 0,40V left, but still with the signal in it

I don't understand this. Please clarify measuring conditions.
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CallensAlec

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Post 07 Jun 2017, 10:38

Re: Ignition signal too low

Thank you for this answer. We fixed the problem by using another transistor which allows more current to flow through it at the same voltage.

When we were measuring from the coil output on the igniter board, so the output going to the coils of the KMS DIS coil. That's where we got the 0,4 V signal.

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