06-15-2016, 10:41 AM
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#11 (permalink)
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Master EcoModder
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Sounds like underdriving it a little more might solve that. I can't think of a 4-cylinder out there (or 3-cylinder) other than the Insight and HCH1 that can cruise on the highway at less than 2000RPM.
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06-15-2016, 11:21 AM
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#12 (permalink)
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MPGuino Supporter
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300 Hz (corresponding to alternator speed of 6000 rpm, or engine speed of 2000 rpm)
As you can see, there is some clipping going on on the upswing of the waveform, as the on-board charge pump takes voltage from the diode drop of the MOSFET. Once the controller has built up its charge, it will apply Vgs to the gate of the MOSFET, causing it to conduct. However, this clipping really doesn't affect the waveform that much, which is why I suspect TI used that 300 Hz figure.
Precisely when the MOSFET starts to conduct, is another matter entirely. Some MOSFETs have V(gs-threshold) of 2 VDC, 3 VDC, and so on. The MOSFET I'll be using has a V(gs-threshold) of about 1.6 VDC at room temperature, and will drop to about 1.25 VDC once it heats up to 80 C inside the engine compartment.
This is what is likely to occur at 1200 Hz (corresponding to alternator speed of 24000 rpm, or engine speed of 8000 rpm)
Like I said, the waveform itself is going to start being distorted. Might be good to introduce a capacitor to filter out the added high-frequency noise associated with this distortion.
Last edited by t vago; 06-15-2016 at 12:32 PM..
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06-15-2016, 08:51 PM
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#13 (permalink)
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Corporate imperialist
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300Hz is 6,000 alternator RPM.
Assuming that this alternator is 6 pole. I believe most alternators are 6 pole.
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06-15-2016, 10:41 PM
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#14 (permalink)
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Aero Deshi
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T Vago's test drive after said mods.......
(Totally kidding, if this is offensive lemme know and I'll delete instantly) |
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06-15-2016, 10:56 PM
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#15 (permalink)
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MPGuino Supporter
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Quote:
Originally Posted by ChazInMT
T Vago's test drive after said mods.......
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Hahahahahaha! Well, I hope that doesn't happen. There's a fire extinguisher within easy reach...
Quote:
Originally Posted by ChazInMT
(Totally kidding, if this is offensive lemme know and I'll delete instantly)
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Watching a restyled Jeep Grand Cherokee burning up? What's not to like? The only offensive thing about that pic is that FCA actually decided to badge it as a Dodge Durango .
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06-15-2016, 11:17 PM
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#16 (permalink)
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Aero Deshi
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Honestly I got electric theory down pat on the gross voltage,current, AC, DC level but electronics baffle me. Soooo I got nothing to contribute...all I can do is sit here with a stupid look on my face.
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06-15-2016, 11:30 PM
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#17 (permalink)
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EcoModding Apprentice
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Me too, over my head!
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06-16-2016, 03:11 PM
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#18 (permalink)
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MPGuino Supporter
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So this is what I think the voltage output of my modified alternator will look like.
I used 300 Hz as the example frequency. Note the notches that appear - those are when the MOSFETs begin to conduct. At this point, the MOSFETs are basically behaving as ordinary diodes.
The voltage drop that occurs across the MOSFETs allows the smart diode controllers to begin charging up their power supply capacitors, which takes about 80 microseconds. Once the capacitors are charged up, the smart diode controllers take over. The smart diodes continue to function until they are no longer forward biased, at which point they shut off - just like a diode.
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07-13-2016, 02:00 AM
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#19 (permalink)
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Corporate imperialist
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__________________
1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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07-22-2016, 01:34 AM
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#20 (permalink)
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EcoModding Lurker
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Hi, the link with the wiring diagram is no longer valid. Please, can you post it here?
Thank you!
Stefan
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