Engineering Stack Exchange
Engineering Stack Exchange

Questions tagged [power-electronics]

149 questions
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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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3
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1 answer

Evaluating the probability of damage to a laptop computer from power surges

Power cords for laptop computers have a transformer built into them. The power supply has a transformer that steps down mains level power to a lower voltage and rectifier that converts the current from AC at the mains to DC. Power surges con occur…
Fred
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Frequency inverters and interference

Frequency inverters produce high frequency spikes on the side of the power input. This is relevant when designing an emergency power supply for a site with lots of VFD, apparantly it is advised to install far bigger alternators so the alternators…
mart
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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 precision unless you have the means to obtain it. ...I'm…
Iam Pyre
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How does the ignition angle determine if a B2C works as a rectifier or inverter?

So I in my text it says that when I have an ignition angle between 0° and 90° my power converter (B2C) works as a rectifier generating a positive output voltage. If I have an ignition angle over 90° it works in "inverter mode" as long there is a…
helphelphelppp
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How to match a circuit relay online

I don't know where to turn to get an answer to this and I hope this is not the wrong setting to ask for this. I am looking for this Song Chuan relay ( and I prefer not to order it clear from China. How do I go about to match this unless no other…
Meta_Alchemy
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phase loss detection

Hi I use this circuit to detect phase loose, so if one of the phase lost , the phase loss signal will be high, the problem in this circuit are. 1-if the input voltage less at 50% it give phase loss , i did try to increase the resistors (R99,R100 and…
Tom
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Effect of high frequency welding near by the electronic things

I have high frequency welding machine. During the welding time, I can see a wave in my lap and computer and also that time stuck my computer.Can you please help to solve this problem?
user21598
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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.
Thomas Owens
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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 solution
srikanthsp
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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). If yes then how we can calculate the difference…
Shubham Mittal
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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 need a motor controller?
shamallah
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