Paralleling Power Supply Units Made Easy ???
I am considering paralleling a couple of 20a variable adjustable psu's for 40a charging. According to what I have read on the world wide inter-web, it can be done quite easily, provided the following ...
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Interesting. They state diode paralleling two supplies will not share current when voltages are a few tents of millivolt apart. With the charging battery voltage always increasing and the inherent thermal voltage drift of the supplies, you'll be forever tinkering with the voltage pot to get them to share. What a kluge!
Bottom line, power supplies in voltage mode will not share unless you add some electronic control as in the edn article. Power supplies in current mode will share.
If you got two cheap PS's that have no current limit, they will not share.
Bottom line, power supplies in voltage mode will not share unless you add some electronic control as in the edn article. Power supplies in current mode will share.
If you got two cheap PS's that have no current limit, they will not share.
LScamper wrote:
From this EDN note "Multiple PSUs share load"
Using diodes to isolate power supplies.
http://www.edn.com/design/power-management/4419835/Multiple-PSUs-share-load
The results were disappointing, since they show that in the case of ±1% voltage deviation, 90% of the power is supplied by a single supply. Basically, this circuit is not a good solution for power supplies with more than a few tens of millivolts difference. The problem is that not all off-the-shelf power supplies have output voltage adjustments – especially not the sealed ones. To solve this issue, a circuit was developed to ensure load sharing using off-the-shelf power supplies and components (Figure 2).
