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Discussion Starter #1
Can anyone provide a source or sources for dc-dc converters
web site or sites would be great

Thx

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Michael Mohlere
My EV: http://www.austinev.org/evalbum/296.html

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Discussion Starter #2
There is always DC-DC modules from Vicor http://www.vicr.com/products/dc-dc/converters/

Sometimes useful modules can be found on e-bay, but you have to be careful and study their part numbering guides carefully.

Mike,
Anchorage, Ak.

----- Original Message -----
From: Michael Mohlere <[email protected]>
Date: Tuesday, October 9, 2007 11:25 am
Subject: [EVDL] best source for dc-dc converters
To: EVDL <[email protected]>

> Can anyone provide a source or sources for dc-dc converters
> web site or sites would be great
>
> Thx
>
> --
> Michael Mohlere
> My EV: http://www.austinev.org/evalbum/296.html
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>

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Discussion Starter #3
<<< Sometimes useful modules can be found on e-bay, but you have to be
careful and study their part numbering guides carefully. >>>

Tru dat! e.g. -
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=290168671442

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Discussion Starter #4
Looks good, but I don't want to be bidding against Lee.

Cor van de Water
Systems Architect
Proxim Wireless Corporation http://www.proxim.com
Email: [email protected] Private: http://www.cvandewater.com
Skype: cor_van_de_water IM: [email protected]
Tel: +1 408 542 5225 VoIP: +31 20 3987567 FWD# 25925
Fax: +1 408 731 3675 eFAX: +31-87-784-1130
Second Life: www.secondlife.com/?u=3b42cb3f4ae249319edb487991c30acb

-----Original Message-----
From: [email protected] [mailto:[email protected]] On Behalf Of [email protected]
Sent: Tuesday, October 09, 2007 2:16 PM
To: [email protected]
Subject: [EVDL] best source for dc-dc converters

<<< Sometimes useful modules can be found on e-bay, but you have to be careful and study their part numbering guides carefully. >>>

Tru dat! e.g. -
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=290168671442

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Discussion Starter #5
Michael,
http://www.iotaengineering.com/12vdc.htm
I use these for testing 12V and 24Vdc products at
work,
www.ametektmd.com.
I have used them with AC inputs and DC inputs and they
work really well for the price. They're designed for
RV use, so they have decent environmental protection,
probably better than a Todd, but not exactly an
underhood EV product without a proper enclosure.
Several people on this list are also using Iota DC/DC
converters with good results.
Rod
--- Michael Mohlere <[email protected]> wrote:

> Can anyone provide a source or sources for dc-dc
> converters
> web site or sites would be great
>
> Thx
>
> --
> Michael Mohlere
> My EV: http://www.austinev.org/evalbum/296.html
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>

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Discussion Starter #6
Cor van de Water wrote:
> Looks good, but I don't want to be bidding against Lee.

Don't worry about it. Other people do (I've been outbid already) :)
Besides, the seller apparently has more, and auctions them one after the
other. The last one went for something like $60.

--
Ring the bells that still can ring
Forget the perfect offering
There is a crack in everything
That's how the light gets in -- Leonard Cohen
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Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart_at_earthlink.net

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Discussion Starter #7
I give up, whats the A for in the last two two digits? The data sheet says thats supposed to be a fixed B. The L is for Long
Tin/Lead pins.

> -----Original Message-----
> From: [email protected] [mailto:[email protected]]On
> Behalf Of [email protected]
> Sent: Tuesday, October 09, 2007 1:16 PM
> To: [email protected]
> Subject: [EVDL] best source for dc-dc converters
>
>
> <<< Sometimes useful modules can be found on e-bay, but you have to be
> careful and study their part numbering guides carefully. >>>
>
> Tru dat! e.g. -
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=290168671442
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>

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Discussion Starter #8
You have one of the best low cost DC to DC converters for a 120 volt =

pack. Most DC to DC converters (that are cheap) are actually AC to DC =

converters that happen to work on DC. Many of those start showing =

reduced output or reliability issues under 120 volts DC (the peak =

voltage for 120 VAC is about 168 volts.) The older Todd "LV" line of =

converters was designed to be safe all the way down to 95 VDC. The =

downside is that they don't protect themselves from under-voltage; =

they can and DO fail from excessively low input voltage.

The Todd units, and most other AC to DC RV converters that work with =

DC input, need to be located in a dry location. You could craft a box =

to fit under the bed where the fuel tank used to be.

The Todd and other RV converters are generally safe up to 200 volts =

(they generally use 200 volt parts on the input side.) Iota quotes up =

to 190 volts but I would guess they are covering their backside.

Here is a bit of e-mail from Iota, send to solarseller and posted on =

their site at <http://www.solarseller.com/ =

_iota_battery_chargers___battery_tender_battery_chargers__instock_and_re =

ady_to_s.htm>:

> From: Jeff Young [snip]
> Sent: Wednesday, January 17, 2007 2:26 PM
> To: Mariette Francis
> Subject: Re: question [DC operation of DLS units]
>
> The DLS-45 and DLS-55 will not produce full output power with less =

> than 130Vdc on the input and will be limited to an output voltage =

> of 13.6Vdc; an increase of the input voltage (to 136Vdc) would be =

> required to attain full output power with the DV (dual voltage) =

> jack installed.
> The DLS-45 and DLS-55 will operate at less than 130Vdc, but at a =

> limited capability. At 96Vdc, the output will remain in regulation =

> up to ~=BD Adc. Above ~=BD Adc load, the output voltage will decrease =

> linearly until the load current reaches ~1Adc (Vout =3D ~10Vdc). =

> Above 1Adc, the output should maintain an output voltage of 9 -10Vdc.
> The DLS-30 (Series M) also has limited operation at lower input =

> voltages. At 96Vdc, the Series M can sustain normal float voltages =

> out to ~20Adc.
> Above 20Adc, the output voltage decreases linearly to ~10Vdc at 30A =

> output.
> Jeff Young - Power Products Engineer

I don't know if the Iota units are quieter but it looks like the only =

one suitable for a 120 volt EV would be the DLS-30 (series M.) The =

one you have will put out 25 amps from about 90 volts up (shouldn't =

be forced to do it below 95 volts for any length of time.) The Iota =

incorporates low input voltage protection (according to Iota, I =

haven't tested this) and gives 5 more amps sometimes and 5 less amps =

other times. (I'm going to guess it would come out ahead overall)

Paul Gooch


Michael Mohlere wrote:

> Can anyone provide a source or sources for dc-dc converters
> web site or sites would be great


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Discussion Starter #9
Iotas are available on Ebay all the time. Do a search on closed auctions to
see what they have been selling for.

On 10/10/07, Paul <[email protected]> wrote:
>
> You have one of the best low cost DC to DC converters for a 120 volt
> pack. Most DC to DC converters (that are cheap) are actually AC to DC
> converters that happen to work on DC. Many of those start showing
> reduced output or reliability issues under 120 volts DC (the peak
> voltage for 120 VAC is about 168 volts.) The older Todd "LV" line of
> converters was designed to be safe all the way down to 95 VDC. The
> downside is that they don't protect themselves from under-voltage;
> they can and DO fail from excessively low input voltage.
>
> The Todd units, and most other AC to DC RV converters that work with
> DC input, need to be located in a dry location. You could craft a box
> to fit under the bed where the fuel tank used to be.
>
> The Todd and other RV converters are generally safe up to 200 volts
> (they generally use 200 volt parts on the input side.) Iota quotes up
> to 190 volts but I would guess they are covering their backside.
>
> Here is a bit of e-mail from Iota, send to solarseller and posted on
> their site at <http://www.solarseller.com/
> _iota_battery_chargers___battery_tender_battery_chargers__instock_and_re
> ady_to_s.htm>:
>
> > From: Jeff Young [snip]
> > Sent: Wednesday, January 17, 2007 2:26 PM
> > To: Mariette Francis
> > Subject: Re: question [DC operation of DLS units]
> >
> > The DLS-45 and DLS-55 will not produce full output power with less
> > than 130Vdc on the input and will be limited to an output voltage
> > of 13.6Vdc; an increase of the input voltage (to 136Vdc) would be
> > required to attain full output power with the DV (dual voltage)
> > jack installed.
> > The DLS-45 and DLS-55 will operate at less than 130Vdc, but at a
> > limited capability. At 96Vdc, the output will remain in regulation
> > up to ~=BD Adc. Above ~=BD Adc load, the output voltage will decrease
> > linearly until the load current reaches ~1Adc (Vout =3D ~10Vdc).
> > Above 1Adc, the output should maintain an output voltage of 9 -10Vdc.
> > The DLS-30 (Series M) also has limited operation at lower input
> > voltages. At 96Vdc, the Series M can sustain normal float voltages
> > out to ~20Adc.
> > Above 20Adc, the output voltage decreases linearly to ~10Vdc at 30A
> > output.
> > Jeff Young - Power Products Engineer
>
> I don't know if the Iota units are quieter but it looks like the only
> one suitable for a 120 volt EV would be the DLS-30 (series M.) The
> one you have will put out 25 amps from about 90 volts up (shouldn't
> be forced to do it below 95 volts for any length of time.) The Iota
> incorporates low input voltage protection (according to Iota, I
> haven't tested this) and gives 5 more amps sometimes and 5 less amps
> other times. (I'm going to guess it would come out ahead overall)
>
> Paul Gooch
>
>
>
Michael Mohlere wrote:
>
> > Can anyone provide a source or sources for dc-dc converters
> > web site or sites would be great
>
>
> _______________________________________________
> For subscription options, see
> http://lists.sjsu.edu/mailman/listinfo/ev
>



-- =

http://www.austinev.org/evalbum/1059
http://stormselectric.blogspot.com/
Storm
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Discussion Starter #11
From: Michael Mohlere
> Is there such a thing as a dc-dc converter, or are they all ac-dc
> converters used as dc-dc converters? forgive my ignorance in
> advance....

Yes, there are real DC/DC converters. In fact, all normal AC/DC switchmode power supplies contain an AC-to-DC rectifier, which powers a DC/DC converter.

The big problem in finding a DC/DC for your EV is that these internal DC/DC converters in common switchmode power supplies are usually 160vdc or 360vdc input. These are not common EV pack voltages, so people wind up using them at the "wrong" voltage. This makes the DC/DC unreliable.

The second problem is a a quality issue. Most mass-produced switchmode power supplies are cheaply made, and intended for indoor use. They don't last long if they get hot, cold, wet, shook around on bumpy roads, etc.

There are DC/DC's built specifically for EV use. But since they are built in small quantities, they are expensive.

--
"Excellence does not require perfection." -- Henry James
--
Lee A. Hart, 814 8th Ave N, Sartell MN 56377, leeahart-at-earthlink.net

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