Cost and Area Reduction

roarin_mouse · Post by **roarin_mouse** » Mon Aug 31, 2009 10:15 am

I don't know who is designing the hardware for the MS3X board but here's a way to reduce circuit cost and component size. Rather than dissipating the reactive energy (of the injectors) in each injector driver transistor, we can use a single clamping circuit for all eight. This lowers the cost for each of the drivers as they will no longer be dissipating the reactive energy. I also added a capacitor to the clamping voltage rail. This capacitor will lower the ground spikes by maintaining a steady flow to ground and should result in a quieter ground. See the attached PDF.

UnaClocker · Post by **UnaClocker** » Mon Aug 31, 2009 11:59 am

Mmmm, he said quieter ground.. SOLD.. hehe.

Bring on the V4 mainboard.

Post by **jsmcortina** » Mon Aug 31, 2009 1:31 pm

The MS3X has already been laid out and the first prototypes are in a production queue. The output uses one VND5N07 per channel, the same as the Sequencer and Microsquirt.

James

roarin_mouse · Post by **roarin_mouse** » Mon Aug 31, 2009 1:39 pm

How are the heat sinked?

Post by **jsmcortina** » Mon Aug 31, 2009 1:54 pm

Reflow soldered to the board, no external heatsinking.

James

UnaClocker · Post by **UnaClocker** » Mon Aug 31, 2009 8:14 pm

So long as Jean publishes instructions for using his P&H board with the MS3, I'll be happy.. I love that board.

Post by **jsmcortina** » Tue Sep 01, 2009 4:16 am

You can be sure that there will be a way to use the P&H box externally.

James

roarin_mouse · Post by **roarin_mouse** » Tue Sep 01, 2009 6:47 am

I hope that there are now two grounds (power and signal). It would be nice to have a seperate ground return (to the block) for the injector MOSFETs. My SBChevy setup with the MSII has been plagued with ground noise. Please say it is.

Post by **jsmcortina** » Tue Sep 01, 2009 6:51 am

Take a look at the wiring diagrams:
http://www.ms3efi.com/doc/hardware.html#wiring

James

roarin_mouse · Post by **roarin_mouse** » Tue Sep 01, 2009 6:58 am

Are they isolated from the other ground? I assume that these are MOSFET source grounds only. Is that correct?

roarin_mouse · Post by **roarin_mouse** » Tue Sep 01, 2009 3:01 pm

Well? Does anyone know if the power ground and signal ground have been isolated? They really should!

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