Load sharing and redundant power systems
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- Опубликовано: 15 сен 2024
- www.phoenixcont...
Learn how a QUINT Power redundancy solution works to maximize the life of your power system. Keep current flowing in the right direction with consistent redundancy, and save energy through the use of MOSFETs.
Transcript:
When you are running a critical load it can be important to have more than one high quality power supply operating in parallel. This is called redundancy. If one power supply fails the other power supply can keep the load going. Let's say one power supply fails in a short. This would cause all the current to run through it and your load would fail. To prevent this, you can use the S-ORING modules from Phoenix Contact to allow the current to flow in the right direction. These modules keep you consistently redundant, decouples your input voltages and saves energy through the use of MOSFETs.
Now, you may know that two power supplies running in parallel need to have the same voltage to supply the current equally. Why is this important? If one power supply is giving all the effort, it will heat up more than its partner and heat is the biggest factor in power supply lifetime. Setting the voltages can be time consuming and as power supplies age their voltages may change in different rates, undoing all of your hard work. The QUINT power supplies can be configured to run in parallel mode. This allows them to cooperate more efficiently without actually passing data back and forth. It is first important to understand how power supplies share a load.
Most power supplies are gonna have a very small drop in voltage as the load increases, usually around 0.1 volts. So if this QUINT is operating at 24.05 volts, at zero amps it will drop to 23.95 volts at five amps. When we add another QUINT we can see how they will cooperate. When the load is at the full five amps, the point where their line intersects tells us how much current each power supply will give. If the power supplies have the exact same voltage they will both give 2.5 amps. If one power supply has a voltage higher than the other, this point will shift dramatically.
The differences are even more extreme when not operating at full capacity. But for this explanation, we will assume the load is at the full five amps. Since the slope is very is very flat, small changes will result in one power supply taking over completely. When the QUINT power supplies are configured in parallel mode, their slopes are steepened a bit. This means that the same change in voltage will result in the intersection point changing much less. Using the push buttons on the front of the power supplies you can set your voltage as you require and then walk away knowing that if over the course of time one power supply drifts from the other, it will have a minimal impact on the life of your power supply and the health of your system.
For more information on our QUINT Power Supplies, please visit phoenixcontact.com/quintpower.
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beautiful explanation sir
I understand the voltage drop, but why does one power supply have a rising slope?
One characteristic is shown left to right and the other right to left. The voltage of either goes down when load is added. It's better shown this way to understand which supply gets the lion's share of the current. Look at the highest point of each characteristic. This tells you which supplies draws the most current at the intersection. If they are equal, then they can share evenly. It's easiest to pick a single load point and focus on what going on there.
In parallel mode, the change in voltage does not change the load sharing as drastically or quickly. (The characteristics are steepened)
0:47 hi, in event of imbalance voltage the lower voltage will took the higher current so it cause of heat up or another way around? thanks
Hi!! Hope you are doing well. I am working in the hospital as a Biomedical Engineer. Unfortunately 1xQuint4-3AC-24VDC-5 out of 2 connected parallel in electrical control panel of medical vacuum pump becomes faulty. Is it possible to operate our vacuum pump on single quint4 supply the one which is in good working condition? If you need picture of the control panel i will glad to share with you.
depends on the Power consumption of the load. if it is below 120 W no problem...
Hello,
Thanks for the video.
I have 1 idea for power sharing:
1st power supply = Solar panels (38-48V) 3x455w (1365w)
2nd power supply from grid = AC/DC PSU 48v 25A (1200w)
There will be diodes before load
LOAD = Battery charger (input is up to 48v 100A, output is 28v (and then I have 8 x step-down converters to 12v) )
I want to share the power between them - to work like this scenario:
1. If its sunny day solar supply will "feed" the load at 100%
2. if there is a cloud/night and solar panels stop producing power or just supply 60% of the load - the rest 40%/100% to come from 2nd PSU (grid)
To work like master and slave I am wondering if I adjust 2nd PSU output to 35V (lower than solars)?
What do you think?
Thanks in advance.
@
@dannnielpeev Hi, Can you please help me in my problem. I have solar panels connected to charge controller and feeding a telecom rectifier Bus bar. on the Bus Batteries , load and rectifier modules are also connected. I have kept float and boost voltage in the rectifier 1v less then solar charge controller boost and float.but there is load sharing. if utillity is not available then solar production is very good But when it restores it share the load again. please help me in maximizing the solar Kwhrs
any video or document will be very thankful , need to adjust the float and boost voltage or do what should i do
Will both ups will show same load reading ?, Or will be some difference, what is its cause
Initially “out of the box” the power supplies can be balanced to exactly share the load current. As time goes by “temperature drift” which is the internal heating and cooling of the components used within the power supplies may cause the power supplies outputs to try to change. By setting the parallel mode the power supplies will compensate for temperature drift on their own. It works like “sense lines” from older power supply designs.
It is possible that during a load share there can be mili-amps of difference. However its not possible in parallel mode for much more of a difference. If parallel mode is not used temperature drift can cause all current to flow from the power supply with the higher, drifted to, voltage.
A good practice would be to check the load share balance if there is no parallel mode for a longer life of the hotter power supply. If you have a parallel mode to select you are in the best way.
@@PhoenixContactUSA we have 2 ups Schneider 100 kva parllely connected to load, but they show different ampere reading, one or two amps difference , is it normal or it have any problem
@@deeptalks3938 I wish I had an absolute answer for you. 100KVA is a lot of AC Power and a lot of amps available. The difference in amps may or may not be OK. One scenario to consider is are the sine waves on the outputs synchronized? They need to be in phase or you’ll have issues. I suspect the Schneider system handles this but I really have no idea. If something is getting hot it’s a sign. I would call the Schneider tech support to have them bless your wiring diagram. Hope that helps and enjoy your day.