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Questions tagged [power-electronics]

152 questions
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What is it about the cabin electrical supply on cruise ships that makes surge protectors dangerous?

Surge protectors are banned on cruise ships, and so are confiscated during boarding. Extension cords and cube taps etc. are discouraged, but not banned. I'm asking specifically about surge protector incompatibility, and would like an answer that…
Ray Butterworth
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Why are bird flight diverters shaped like a spiral?

I was out walking and saw these strange looking spirals on some power lines. When I got home I did some research and discovered that they are to prevent birds form hitting the power lines, mainly used in conservation areas. I found this interesting…
jhabbott
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12
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What causes the sound coming from electrical vehicles?

All the electrical vehicles I've ever ride make that humming sound (either cars or trains). What exactly causes that sound? Is it drag force in the gears? Is it a fan? Or is it because of the coils (see coil noise)?
cinico
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9
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3 answers

Motor for a hydraulic pump in a hydraulic system

I am a complete beginner to hydraulic systems, and I've wanted to learn more about this area. I'm designing a hydraulic system that involves using hydraulics to push/pull objects using pistons. I have looked at what the basic requirements are for a…
Tom
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9
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3 answers

What are the differences between linear and low-dropout (LDO) regulators?

At a high level both a linear and LDO regulators appear to be the same. Most block diagrams appear to be the same too. Most of the device packages are three terminal packages. What are the differences between linear and LDO regulators?
706Astor
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8
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How can I find the emission power of a WiFi mobile phone antenna?

I need to find the emission power of a WiFi mobile phone antenna. I have checked the IEEE 802.11 specifications but it says that the power transmission is variable and depends on the mobile phone fabricant and power saving options. I also searched…
agonza1
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When is DC power generation superior over AC power generation?

If the goal is to transmit power over a large distance, I can see the advantage of an alternator over a generator: more power, less loss. If the target DC load is small and very close by, would an alternator still be more advantageous in terms of…
Paul
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What device is this, and how does it work?

There is this device I saw when I was a child at a big music store, that makes me curious. It was meant to listen some CDs to try them out before the purchase. You stand under a bell-shape kind of "speaker" to hear the music, but as soon as you step…
Zorgatone
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5
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12V outdoor lighting power consumption

In an 12v outdoor lighting circuit, is our electrical consumption (our electrical bill) determined by the 50W 12V bulb that is connected to the transformer, or the 300W rated output of the transformer? I have equally received two answers;…
Steven M
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DIY BLDC ESC problem is causing MOSFETS and motor to get very hot very fast, HELP

Hey everyone this is my first time reaching out to the community for help to see if someone can show me what I'm not seeing on this. Basically I am trying to make my own ESC for a BLDC and before anyone says the commercial solution is cheaper and…
Harry_CL
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5
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1 answer

Hydraulic power source

I'm looking for a power source that is able to deliver 12V at 15-30A (yes, amps). I was looking at high capacity batteries, but looking at the specs, they either say they have a lower discharge voltage than 12V, or they don't say anything at all.…
Tom
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4
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Circuit Design Inductor Problem

I am having trouble finding a 3.4 µH through hole inductor that is in stock right now. I was wondering if I can just place 2 inductors that add up to 3.4 µH in series to solve this problem. I am not sure if this would introduce any problems, if so…
user3897744
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Can a DC voltage booster be connected directly to a DC to AC inverter?

I am doing a project on a generator. Instead of using an alternator I am using a dynamo. I then amplify the voltage produced using a DC to DC voltage booster. However, can I get a higher AC voltage by connecting it directly to a DC to AC inverter? I…
momo
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4
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Preventing a DC motor from stalling

My team is trying to build a mechanical cannon for a final project for a course and we are running into some problems with our motor stalling. Our motor stalls when the plate hits either side of this railing (as shown with circles below) because, I…
Ryan Dehmoubed
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Effects of Solar Shield on Electronics Enclosure

I am designing a prototype of an electronics package that will sit out on a pole in the sun 24/7 with a max ambient temperature of 50˚C and at 30˚N latitude. It produces 50W of internal heat and the electronics are rated to 70˚C. …
Shea
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