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  #1481  
Old 01-10-2017, 03:07 PM
arber333 arber333 is online now
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Default Re: Another homebrew AC-controller

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Originally Posted by jhuebner View Post
Right, thats the idea. Of course in your example if you have 400V input your pack needs to be >564V discharged for it to work.

Just realized I need to handle the case when the inverter is still switched on and the user plugs in mains. A simple relay as in my first drawing would dump rectified mains on the closed bottom switch of the respective phase.
Well good luck with finding such nominal DC voltage (besides Johannes) at boost... I will probably try boost from single phase and if that works buck from 3phase. That should be interesting.

I have a solution for inverter still being active when AC comes online.
I used a simple 230Vac relay to trigger the Emgcy pin when AC is on. So as not to drive off when charging.

Johannes does your charger mode start only when the key is ON or anyway? Inverter should just get 12V somehow yes? Start pin is not needed for this.

A
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  #1482  
Old 01-10-2017, 03:47 PM
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Default Re: Another homebrew AC-controller

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Well good luck with finding such nominal DC voltage (besides Johannes) at boost... I will probably try boost from single phase and if that works buck from 3phase. That should be interesting.
A local company has built a couple of Mercedes Sprinter Vans on 800V. But you're right, it's still a pretty exotic setup. At least until car makers realize it's easier to fast charge a HV battery than a LV battery.

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Originally Posted by arber333 View Post
I have a solution for inverter still being active when AC comes online.
I used a simple 230Vac relay to trigger the Emgcy pin when AC is on. So as not to drive off when charging.
Yeah but that way the charger won't start as you have disabled one of the inhibit pins. You would need just a short low pulse on the emgcy pin. Like connect it to both NO and NC contact and use the dead time. That way drive mode would be safely disabled. When charge mode is active you can't drive anyway.
Question remains: emgcy stop pin is 16Hz low pass filtered, so there is a small delay between AC coming on and PWM disable. I'm actually considering some kind delay-relay so AC into the rectifier arrives after (like 100ms) the disable pulse.

EDIT: this just got me thinking: I should check the startup time of my AC/DC converter for the aux battery, maybe that is around 100ms.

Quote:
Originally Posted by arber333 View Post
Johannes does your charger mode start only when the key is ON or anyway? Inverter should just get 12V somehow yes? Start pin is not needed for this.
start pin is indeed not needed. Just 12V power to the inverter (and inhibit pins)

Last edited by jhuebner; 01-10-2017 at 03:56 PM.
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  #1483  
Old 01-11-2017, 03:10 AM
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Default Re: Another homebrew AC-controller

Well yes my plan would be to boost single and buck three phase. Does the current software support buck mode also?
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  #1484  
Old 01-11-2017, 03:15 AM
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Default Re: Another homebrew AC-controller

Yep, buck is supported.

I'm working on my web site to have the information easily available.
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  #1485  
Old 01-11-2017, 01:39 PM
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Default Re: Another homebrew AC-controller

Website updated: http://johanneshuebner.com/quickcms/...arging,27.html
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  #1486  
Old 01-11-2017, 02:08 PM
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Default Re: Another homebrew AC-controller

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Originally Posted by jhuebner View Post
Yep, buck is supported.

I'm working on my web site to have the information easily available.
Hoping to get back to my project here real soon. Nice to follow the charging abilities. Buck being the most desired for high current low voltage packs.
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  #1487  
Old 01-11-2017, 02:18 PM
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Default Re: Another homebrew AC-controller

Johannes, very clear update. I need to get a car built so I can actually start using my gathered EV components

I wonder how much power you could pull with one of these from a three phase charging station (EU one so 230v x 3). Should be 32 amps x 230 x 3.
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  #1488  
Old 01-15-2017, 03:39 PM
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Default Re: Another homebrew AC-controller

Johannes your website says Boost(4) Buck (5) but the firmware description says:

"chargemode 0=Off, 3=Boost, 4=Buck"

not to confuse with opmode that is also needs to be set same?

0=Off, 1=Run, 2=ManualRun, 3=Boost, 4=Buck, 5=Sine, 6=AcHeat

mistake somewhere on your website or firmware?
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  #1489  
Old 01-16-2017, 03:17 AM
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Default Re: Another homebrew AC-controller

Oh, thanks for pointing it out! Mistake on the website. Will fix it.

Have you updated your web interface to use the category/module names?
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  #1490  
Old 01-18-2017, 04:11 AM
arber333 arber333 is online now
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Default Re: Another homebrew AC-controller

Hi JB
Would you be willing to make a new revision (V5) of your integral board that would include full quadrature encoder connection. It would be 5pin connector besides your spare pins connector. It would provide +5V, GND, signal A, signal B, Index or Z pins to connect encoder in future versions. Signal A could be existing encoder connection.
Since STM is 3V3 level you would have to add divider network or small transistors to translate signal to 3V3 level. Would that be ok?

Johannes would it be ok to have signal A hooked on your old encoder pin?
Would you be willing to make a module in code for quadrature encoder?
That way we would have a choise when we tried to use BLDC or ACIM.

tnx

Arber
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