Questions tagged [power-electronics]

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1answer
37 views

My output is much lower than I expect it to be for my transistor-zener diode voltage regulator

I have created this simulation ( see below) of a transistor and zener diode voltage regulator. The output is supposed to be a steady 5 V. But it is like the top bit s cut, to an approx 4.4 V value, ...
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1answer
30 views

Simulating AC using DC

Is it possible to power an AC motor, using alternating positive and negative DC current? I would assume toggling between each at 60hz would work.
13
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1answer
149 views

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 ...
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1answer
39 views

How much power will 4 germicidal lamps use?

I was wondering if this portable power supply will be sufficient for running 4 UVC lamps all at once. If so, for approximately how long? Power Supply: SUAOKI G100 27000mAh /3.7V Power Bank Station ...
1
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1answer
63 views

Why are phones not getting charged when I supply 5 V and 0.3 A?

I'm using thermoelectric module to get the voltage. With the help of it, I'm getting 3 volts Open circuit voltage. I've attached DC-DC converter which regulates this voltage to 5 volts. I've attached ...
0
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1answer
39 views

A board or mat that we can detect a push at an exact point

Is there any kind of board or mat that when we place it on the floor and wire it, a self-made connected device can read these data when it is being pushed and holding onto it, at multiple points? ...
1
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0answers
62 views

LED Lights Dimmer Electronics

I have a Wemo Smart WiFi Smart Dimmer with me that can control CFL, Incandescent and LED lights. (https://www.belkin.com/us/p/P-F7C059/). I am curious to know how one device can handle all type of ...
1
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0answers
59 views

Mosfet switching circuit

I am trying to make a MOSFET switching circuit where its gate input is 12V clock pulse. Now when I put the load between (Vdd) and (Drain), there is no drop voltage VDS, but when the gate input falls ...
1
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0answers
16 views

Fabrication strategy to build larger version of our ESP

Our setup https://www.youtube.com/watch?v=uKuzshqjkYA The diesel generator exhaust is routed via our test setup. (notice the difference between ON/OFF states). Generator in test is similar spec as a ...
0
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2answers
121 views

why do 15kV 60mA transformers have to be so big?

I need a high voltage power supply for the homemade CO2 laser I am building. I understand that a 15kV 60mA transformer is a thing, but its very big and heavy and its out of phase meaning each lug is ...
4
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1answer
99 views

Simultaneously charging and transmitting data to an android phone using usb

Dear engineers, I have to make an engineering project which is a portable solar phone charger. One thing I need to do in it is to somehow charge the phone (android) from the battery (which is charged ...
0
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2answers
69 views

Is hall sensor also used in PMSM drive scheme as like used in BLDC motor?

I am little bit curious about, is hall sensor also used in PMSM motor drive? Since in PMSM motor the voltage applied is sinusoidal, all 3 phase are active, so a rotating flux is introduced, which is ...
0
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1answer
44 views

Electrical Engineering

I used a 2N3055 powerTrans with a collector transformer (6-220v)load with an audio input base bias from a audio source , I am getting 160vAC from 6v DC , i want 220 v AC out , Can anyone suggest a ...
0
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2answers
58 views

what is the commercial name of active power filters?

I've been studying for a while now topics related to power quality issues, such as harmonics caused by non-linear loads and power converters, and I've been working on Active Power Filters, but since I ...
-4
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1answer
52 views

Power consumption of mining rig? [closed]

I plan to buy a mining rig, with 750 watt PSU. It will be turned on for 24/7. I had like to calculate, how much kw/h will it spend per month?
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2answers
63 views

Working mechanism of photovoltic cells

In the textbook : Electric Power Principles, in Chapter 1 on the working of a pv cell : The source current Is is the result of absorption of photons in sunlight that cause separation of ...
2
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0answers
28 views

Detection of weak signal by satellites

An animal's blood pressure and/or body movements can be used to generate a few mW of electrical energy. Can an RF transmitter which radiates 1 mW be detected by receivers (without any parabolic ...
2
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1answer
48 views

Generating practical power without an iron core, but with high RPM

Here's what I'm proposing - a small turbine directly coupled to a permanent magnet that's spinning at, say, 150k RPM. The magnet is enclosed one or several wire loops parallel to the axis of rotation. ...
2
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0answers
37 views

Transient overvoltage protection by varistor

Using a varistor is a common practice in alternator excitation system. It is used with rotating rectifier diode. Is it used for transient overvoltage protection? Is it protecting diode or rotor ...
1
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2answers
31 views

Control power to a tungsten filament?

I'm afraid I'm completely out of my depth here. I would like to use a tungsten filament to radiatively heat something near to it (in vacuum). My issue is I cannot figure out the easiest and/or ...
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2answers
79 views

How dangerous are these new rail guns on the U.S. Navy ships?

I was reading an article on them, and I thought should these become the main weapons of the ship then a single EMP could disarm them. Then that brought up the questions: Are EMP s still just sci-fi? ...
1
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1answer
99 views

Can I Calculate The Discharge of a Capacitor If All I know Is Algebra

Since my last post on Engineering-Beta, I have composed a few simple simple circuits involving capacitors(super-caps specifically), resistors and LED's. The following image is of a branch from a ...
1
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2answers
81 views

Is current suppose to pass through a capacitors dielectric? What happens if it does?

I have been building my first simple circuits with just resistors, LED's wire, and alkaline batteries. Now I would like to add capacitors to my components box. Read a couple of articles online on ...
1
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1answer
67 views

Confusing symbol in led labeling: How to Obtaining precision with hobby electronics?

Does anybody know what that "f" looking sign is next to the 5, left-hand bottom corner of the LED labeling?: It Indicates the diameter of the LED package. Summary of Conclusion: Don't seek ...
1
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0answers
39 views

I would like to run a smartphone using a primary battery instead of rechargeable for a project. What are the 4 contacts used for on the factory LiPo?

Most phone batteries will have a connector of some type with 4 contacts. Of course two of those I'd expect to be +- Voltage, but the other two compose some sort of mystery input to the phone (...
1
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3answers
137 views

Advantages of quadruple motor electric car

When Tesla introduced the dual motor model s it had better range and performance (so better in everyway except price). Would a quadruple motor car (one per wheel) have even better range and ...
0
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2answers
43 views

Transformers in parallel/series

I ran across the diagram below in the mindtomachine blog post describing an homebrew arc welder. It shows two transformers with inputs in parallel and outputs in series. Is there some advantage to ...
1
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0answers
27 views

Charging a Li-po battery (battery output current)

I would like to design a buck converter to use a PV panel to charge a 11.1V 3000mAh 3S 30C Lipo battery. I want to choose the minimum inductance for a CCM ($L=\dfrac{V_{out}T_s}{2I_{out}}$), what is ...
0
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2answers
101 views

Why not skip inverters and use solar power directly as dc?

To maximize efficiency and reduce cost I am contemplating using the power from solar cells directly as dc without conversion to ac. I plan to wire and connect the solar panels in series and parallel ...
0
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3answers
86 views

PED or DSP for mechatronic student [closed]

I am doing mechatronics engineering and i am to choose an elective module. We have the choice of taking up Digital Signal Processing or Power Electronics and Drive. Majority of my friends are taking ...
2
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1answer
86 views

How do I hook these components together to get my desired functionality?

I have a big button http://store.2xlnetworks.com/thebigbutton/ and a display counter Microframe Model 265 https://www.microframecorp.com/d0265-6-digit-rugged-computer-controlled-display . I want the ...
1
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1answer
66 views

Split phase on industrial devices

I want to build a professional CNC router for my garage. I want to use the residential split phase configuration for power to my VFD and industrial power supplies. I cannot find any straight answer ...
0
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1answer
89 views

What is the difference between 250W band heater and a 200W one? [closed]

What is the difference between 250W band heater and a 200W one? Can they reach the same temperature?
0
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2answers
88 views

Creating a constant internal temperature that is negligible to the external environment

Okay, Hi there Engineers! I am a newbie to this site, and to engineering. So, I wanted to make this post to get all the help I can get. I have been set a task of creating a prototype of the following;...
6
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2answers
2k views

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 "...
-1
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1answer
246 views

Some questions about liquid nitrogen cooling [closed]

I am currently tinkering with a railgun experiment, and I was thinking of using a liquid nitrogen loop to cool the rails down to very low resistance, and inject some nitrogen into the barrel between ...
0
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1answer
112 views

Difference between Reactive power input and Reactive power consume by Load?

In a power electronics converter is there any difference between reactive power input to the converter and reactive power consume by converter? (In case source current waveform is square in nature). ...
1
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0answers
98 views

Sliding Mode Control

I was going through some literature in power electronics relating to sliding mode control. I noticed that they have separately dealt with the reaching condition and then the existence condition for ...
-1
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1answer
27 views

Project on rain detection and home automation system

I am doing a project on rain detection and closing of windows. It is school based project. I am using an arduino, a rain sensor and a motor. Kindly advice on the right motor to use. And also, do I ...
0
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2answers
92 views

Low voltage, high ampere battery safety

I want to power an Arduino project for several weeks on a remote location. At the location, data is gathered and sent over the internet. The project runs on 5V and draws 200mAh max. I need a power ...
3
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1answer
191 views

External circuit turning on powerbank

I have a circuit that consumes enough power to keep running from a powerbank. However, to save energy I'm putting it in low energy mode at night. Problem with powerbanks, they turn off when not ...
1
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0answers
442 views

How to power a large electric motor from a battery?

A question I ask myself now and again is if it is technically feasible to build battery powered construction equipment, like large excavators - say 250kW motive power at the shaft of the central ...
1
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1answer
352 views

Is there a more efficient transducer to convert mechanical energy into electrical energy than electromagnetic induction? [closed]

I know piezo film has one of the lowest efficiency to date when it comes to converting mechanical energy (or stress in the context of piezoelectricity) and motor (magnet and coiled copper wire) seems ...
4
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2answers
115 views

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 ...
12
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1answer
1k views

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 ...
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1answer
912 views

Transformers with no load [closed]

Could someone please explain why, when there is no secondary load, the applied voltage of the primary roughly equals the back EMF of the primary? Since the primary coil is an inductor I wondered ...
1
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1answer
56 views

Making a strong electro magnet

I am looking into making a strong electro magnet. I want it to be able to hold around 100 pounds of weight or more. Would a magnetic core like this work at all? I'm planning on wrapping wire around ...
3
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2answers
72 views

How to choose an electronic connector/cable that works in a vibrating environment?

We are designing a diagnostic electronic tool for a vibrating table. In our PCB there are a gyroscope, an accelerometer and a bluetooth module. Our PCB is attached to a vibrating table that works at ...
4
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1answer
204 views

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 ...
12
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1answer
404 views

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 (...