Hi Douglas,
I had the impression that the 480V DC level
was to connect to the pack directly, so that
the charger would be offboard and only some
monitoring (temp, voltage, Ah, whatever) would
be onboard, so you are not dragging around a
very large, heavy and bulky fast-charger, but
just the battery pack.
I think that was also the idea with the old
AVCON connector, it allowed a direct DC
contact to the pack to allow a real charger
in the wall/pedestal unit, instead of just a
glorified wall socket with an extension cord.
Such an offboard charger would need to boost
the 240V up to the 480V DC or thereabouts and
follow the commands via the pilot signal(s)
about providing current and tapering back.
I may be mistaken as I never read the full
J1772 spec...
Cor van de Water
Director HW & Systems Architecture Group
Proxim Wireless Corporation http://www.proxim.com
Email:
[email protected] Private: http://www.cvandewater.com
Skype: cor_van_de_water IM:
[email protected]
Tel: +1 408 383 7626 VoIP: +31 20 3987567 FWD# 25925
Tel: +91 (040)23117400 x203 XoIP: +31877841130
-----Original Message-----
From:
[email protected] [mailto:
[email protected]] On
Behalf Of Douglas A. Stansfield
Sent: Monday, December 13, 2010 7:15 PM
To: 'Electric Vehicle Discussion List'
Subject: Re: [EVDL] J1772 Plug, Inlet and Adapter Boxes
Cor,
My onboard charger isn't rated for that much voltage and current so this
is
a project that will have to wait. I am really glad that you are
encouraging me to build something however.
In the future, should I attempt this, you are the first person I will go
to for advice.
Sincerely;
Douglas A. Stansfield
President
www.TransAtlanticElectricConversions.com
973-875-6276 (office)
973-670-9208 (cell)
973-440-1619 (fax)
ELECTRIC CAR PRODUCERS
-----Original Message-----
From:
[email protected] [mailto:
[email protected]] On
Behalf Of Cor van de Water
Sent: Monday, December 13, 2010 1:10 AM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] J1772 Plug, Inlet and Adapter Boxes
Why wait?
It depends on whether you want to build it yourself and if you have the
protocol that may be needed to close contactors and such, but if it is
according to
J1772 then I guess it is already available.
So you are essentially building an off-board charger and the simplest of
chargers is a current limited PFC controller cranked up from the default
400V to 480V....
It will be a challenge to get the max current flowing but the topology
is rather simple.
Now if you are also asking for isolation and a whole host of other
features that are not necessary but are required to make the charger
excessively expensive, ahem, I mean to deter from making Evs popular,
errr, I mean that are put in the standard to make charging
*really* safe, much safer than plugging in a toaster with wet hands and
standing barefeet on a stone floor...
So safe that you could attempt charging while submerged in water, like
some demo from the '90 demonstrated...
I'd say just build something that should work and see if it needs
improvement or that it is good enough.
Since your 240V connection is likely limited to 50A unless you are
dedicating a 100A subpanel connection for your charging, you will get a
max 10kW continuous (20kW if you are on 100A) so if your car needs
another 20kWh your dwell time at home is 2h (1h at 100A) so that it is
possible to return from work, cook supper and eat it at ease, then go
for another long drive in the evening with a full charge...
Most PFC reference designs show the architecture for about 500W
conversions with universal 90V-260V AC input.
To reach 10 or 20kW at 240V will need quite some scaling up of output
drive, switching FET and diode and inductor.
Not to mention that your output capacitor may not only need some
doubling up but also use two in series with a balancing resistor divider
since 400V capacitors are common and higher voltage is harder to find.
In my EV the controller was spec'ed up to 700V DC and it also used a
series-parallel configuration of 400V caps.
Cor van de Water
Director HW & Systems Architecture Group Proxim Wireless Corporation
http://www.proxim.com
Email:
[email protected] Private: http://www.cvandewater.com
Skype: cor_van_de_water IM:
[email protected]
Tel: +1 408 383 7626 VoIP: +31 20 3987567 FWD# 25925
Tel: +91 (040)23117400 x203 XoIP: +31877841130
-----Original Message-----
From:
[email protected] [mailto:
[email protected]] On
Behalf Of Douglas A. Stansfield
Sent: Monday, December 13, 2010 9:43 AM
To: 'Electric Vehicle Discussion List'
Subject: Re: [EVDL] J1772 Plug, Inlet and Adapter Boxes
I'm really looking forward to 480DC fast charging!!! Now that is going
to
be interesting!!!
The Leaf has an Inlet for the 480v charging.....I just wish I could
figure out how to get that out of my 240v garage set up.....Guess I will
have to wait....unfortunately.....
Sincerely;
Douglas A. Stansfield
President
www.TransAtlanticElectricConversions.com
973-875-6276 (office)
973-670-9208 (cell)
973-440-1619 (fax)
ELECTRIC CAR PRODUCERS
-----Original Message-----
From:
[email protected] [mailto:
[email protected]] On
Behalf Of
[email protected]
Sent: Sunday, December 12, 2010 9:55 PM
To: Electric Vehicle Discussion List
Subject: Re: [EVDL] J1772 Plug, Inlet and Adapter Boxes
> I have been selling these J1772 Plugs and Inlets for some time and
> once you have access to 240v charging you will never go back.
> Sincerely;
>
> Douglas A. Stansfield
> President
That's for sure! Charging with our new 240 volt, 25 amp charger really
wakes up the tired golf cart batteries. 240 is definitely the way to go.
Yep, you'll never go back to 120.
Russ Kaufmann
Russco Engineering
http://russcoev.com
Beta Charger Coming Soon Way Under $1K
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