RACPRO1-4SP e-Fuse Series: Smart Fault Strategy

Video Transcript

Michael: My name is Michael Schrutka, product manager for AC/DC standard power supplies at RECOM, and I'm here with my colleague from the field application engineering, Mos, who will show us the behavior and the performance of our e-Fuse today. So, can you explain shortly what we see here?

Mos: In this setup what we have is that we have components like our RACPRO AC/DC converter. It is connected to our latest model e-Fuse.

Michael: So, Mos let's have the situation why we usually select e-Fuses. Power supply is running smoothly but one of the loads one of the channel gets into overload or even into a short circuit.

Mos: In this case you can see immediately this channel goes into protection mode. Channel 1 got isolated while the rest are staying intact. So even on no scope we can see channel 1 is zero. Other channels are still at 24V.

Michael: What happens if the short circuit disappears again?

Mos: So, it has auto recovery. For example, we have different modes here. Now it's in recovery hiccup mode. Then we put back, the load comes back again normally.

Michael: And the whole system runs smoothly again.

Mos: Yes, we have competition let's say the competitive one. This let's say short circuit situation affected all other channels. It propagated through whole outputs.

Michael: So, Mos can you show us the situation when the power supply is not properly selected? Let's say the power supply is undersized and one of the channels gets an additional loading. So would drive the power supply into overload.

Mos: Yeah, sure. Channel 1 and 2 are fully loaded and channel 3 half loaded and after a while, which is 5 seconds because this unit has a push power. You see here the channel 4 got isolated because channel 4 has the lowest priority in our architecture. In our architecture we have a backboard let's say priority listing. Channel 4 has the least priority than channel 3 and so on.

Michael: Okay, and what happens if the load comes back to 5A to the standard load?

Mos: Yes, good point. Now when we put it back again it recovers itself.

Michael: Can you show us how the competitors perform when the power supply is in overload? If the loads together draw too much current.

Mos: Now you see here completely different function. You see that there is no let's say sequential shutting down the output. There's no priority, no intelligent power shut down for outputs. So, it's completely random. This is completely random.

Michael: Let's see the situation for a system startup. Typical behavior if the complete system is in silent mode, in sleep mode, and then we need to ramp it up especially if one of the channels sees heavy capacity floating. How would it react?

Mos: Yeah. So here for this setup we brought a big capacitive load 33mF. We connected to our channel 1. Now we are enabling it. It's fully charged. Now we see how it handles this huge capacitive load. You see here very smooth ramp up and complete constant current mode, fully charge the load. And we see the other outputs are, let's say, intact with zero affection.

Michael: How do the competitors perform with the capacitive heavy load startup? How about bigger systems? I see an e-Fuse here with four channels. If a system requires six channels or eight channels or even more, how could I set up such a system?

Mos: So, we have to consider we have to size the power supply accordingly and the proper size gauge wire to make the connection. So, for here since we are using a spring clamp without using any tool, we just insert it in. So, this one, this one.

Michael: Directly to the e-Fuse without any another terminal blocks or?

Mos: Nothing. No terminal blocks, no joints, nothing. So easy.

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