Power supply design: 60V, 30A

[Centmo]

I looked further into the ZXY6020, which Crazy Ape suggested. Turns out that its a buck converter, so in order to get 60V out, I would have to supply at least 60+V in. The DC input voltage range is 13-62VDC. So, I assume that you would need a 62VDC, 25A supply in order to run this thing at 60V, 20A. Good luck finding that.

So, I'm basically back to square one, staring down a $2000 telecom-grade 1.5kW DC supply. (still need to find a price on the 20A iTech unit).

NiHaoMike may be on the right track....I need to see how the EV guys are doing it.

[AmmoJammo]

All you need is two good quality switchmode 30volt, 800watt supplies connected in series. Im sure there's something fairly easily available. Meanwell maybe?

[jabramo]

This?

http://www.ebay.com/itm/Xantrex-XFR60-20-DC-Power-Supply-0-60V-0-20A-XFR-60-20-/181211771612?pt=LH_DefaultDomain_0&hash=item2a311032dc

Made in Canada 

[Centmo]

That Xantrex looks like a nice unit for a one-off, but I need something I can order hundreds of, and all be identical. So, it would have to be a new product I can order again and again.

I checked meanwell, and no 30V DC supply. Connecting AC/DC supplies in series makes me a little nervous too, unless the manufacturer explicitly says you can do so.

[Crazy Ape]

Both of these match the thread title.

http://www.aliexpress.com/item/KXN-6030D-High-Power-Switching-Power-Supply-adjustable-DC-60V-30A/1388979807.html
http://www.aliexpress.com/item/0-60V-0-30A-Maisen-MP6030D-Switching-DC-Power-Supply-Free-Shipping-by-DHL-UPS-TNT/704637719.html

[AmmoJammo]

I checked meanwell, and no 30V DC supply. Connecting AC/DC supplies in series makes me a little nervous too, unless the manufacturer explicitly says you can do so.

SP-750-27 is a 27volt, 750watt supply that can be adjusted upto 30volts

http://www.mean-well.com.au/shop/sp-750-750w-single-output-power-supply/926-sp-750-27.html

I assume they can be connected in series, but it might be worth while contacting Meanwell

I didn't realise they were so expensive new though! I paid like $35 each for some 800watt meanwell supplies :p

[Centmo]

Thanks Crazy Ape...great price on those units. I wonder if they can run on 110V. One of them says so, but gives some conflicting information. I also wonder if these would be UL/CSA approved.

AmmoJammo...good point on the adjustable output of the 27V unit. But yes, they do seem pretty pricey for a fixed output supply. Maybe meanwell is cashing in on the reputation they've built up.

[AmmoJammo]

At the end of the day, if you need availability, and reliability, I'd be going with the Meanwell. I assume the intention is to build the power supply into another larger device?

[Jon86]

Both of these match the thread title.

http://www.aliexpress.com/item/KXN-6030D-High-Power-Switching-Power-Supply-adjustable-DC-60V-30A/1388979807.html
http://www.aliexpress.com/item/0-60V-0-30A-Maisen-MP6030D-Switching-DC-Power-Supply-Free-Shipping-by-DHL-UPS-TNT/704637719.html

The chinglish on that second one is bloody awful...

[Crazy Ape]

Both of these match the thread title.

http://www.aliexpress.com/item/KXN-6030D-High-Power-Switching-Power-Supply-adjustable-DC-60V-30A/1388979807.html
http://www.aliexpress.com/item/0-60V-0-30A-Maisen-MP6030D-Switching-DC-Power-Supply-Free-Shipping-by-DHL-UPS-TNT/704637719.html

The chinglish on that second one is bloody awful...

Indeed, but it could have been worse.
http://boingboing.net/2008/07/15/chinese-restaurant-c.html

[Ericho]

Indeed, but it could have been worse.
http://boingboing.net/2008/07/15/chinese-restaurant-c.html

 

I'm currently looking into a MAAS switching power supply for the lab.
They do not go up to 60V but they may still be worth to have a look at, they are cheap

Eric

[The Bart Man]

Hi There,

I think you don't need a power supply but a battery charger!!! You want to charge a battery right?
A power supply doesn't have any current control and when charging a battery; lead, lithium or any other type you NEED current control.

I understand you will have some sort of BMS. This will have to be able to balance the cells and cut of any charger or load to protect the battery from over or undercharging.

There are many chargers available for this voltage and current range. Also OEM probably.

[ee.jmlp]

you need a power supply, but not a voltage source power supply with current limit you need a current source power supply  with voltage limit

Any switched converted will work for you with the right coil. You can use a step down converter. Get a high flux toroid like HF-300060-2 (stack two or even three for 30A) and use no less than 70kHz and no less than 300uH (litz wire), I use them if you need a proof I'll upload a photo

You can use a voltage controlled converter, if you put as load the battery in series with a shunt resistor, the feedback loop senses the voltage between shunt and ground and triying to maintain the voltage constant across the shunt (and so the current) it will maintain the current constant across the battery.

regulator out+ --- +battery- ---(fb loop node)--- shunt resistor --- GND

[mtdoc]

For a basement bargain price on a well made switch mode PSU that can put out up to 50 amps at 60 V Check This Out. Would be a project to adapt to your needs. It would need a transformer to work with 120V and BMS to limit current for LiPos.

I'm adapting one to use on my 48V 436AH AGM solar system battery bank.

[Eviltech]

I have seen pretty beefy toroidal transformers that the second hand AC sellers use to convert the 240VAC to 120VAC so they can run the japanese standart air conditioners. I have seen such that run 3000BTU AC's Those in here are not more than 100-200$ and adding a small DC-DC converter on the output to keep the eficiency and steady the voltage seems a good combo... Those toroids are a bit heavy though...

[peter.mitchell]

How about you buy 14x isolated 5v 30a powersupplies, adjust the output voltage to 4.2v, and stick 0.05 ohm power resistors on the outputs, hook each one up to each individual cell.

Should charge at about 29a~, current limited by the power resistor, and constant voltage of 4.2v, no need to worry about balancing.

http://www.meanwell.com/search/NEL-200/default.htm

http://www.amazon.com/Amico-0-05-0-05R-Aluminum-Resistor/dp/B0087ZCRQK