Questions tagged [power-electronics]

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1answer
51 views

Line to line voltage

I have a question regarding power electronics. What is the meaning of 'line to line voltage' what does it tell us and how can this be calculated. Say I have a three phase system how would one find the ...
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1answer
28 views

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. ...
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1answer
52 views

Power Electronics Project

Can I use 220-12v,1.5 Amps Stepdown transformer along with 12V 2A (KBP200) bridge rectifier to build a charger for 12v, 7.5AH battery or I should use transformer with Higher output, maybe 15V
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0answers
31 views

Why using Tyristor (SCR) for inverting the DC voltage in HVDC systems?

In High Voltage 3 PHASE Transmission Systems the voltage needs to be rectified (from the AC generation source to DC), transmitted, and then inverted back (From DC to AC). For doing this, usually LCC (...
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1answer
32 views

Can a level shifter convert power from 3.3v to 5v and then back to 3.3v?

I need a digital output from a raspberry to power a stepper driver that takes 5v as input. After that, the output from the stepper driver must be converted back to 3.3V because a Pi can't handle 5v on ...
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0answers
20 views

Solving single phase no load transformers questions

1000/100 V, 10kVA, single-phase transformers impedance referred to HV side given as (5+j10). The no-load power of the transformer is given as 300W. What is the efficiency of the transformer at full ...
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5answers
98 views

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 ...
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1answer
47 views

How do I reduce the mains spike in a switched mode PSU?

I have a switched-mode PSU for a gaming laptop. It has a bad habit of burning out the switches on mains extension panels when I turn it on (two in the last four days). The turn-on surge is always ...
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0answers
18 views

Calculating kWh two-phase alternating network 3 wires

I want to do a project to measure electrical consumption but I have the following question: How to calculate kWh consumed in a 3-wire biphasic network? Example: I have the following chains on the ...
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2answers
17 views

Cheapest way to connect ignition coil to spark plug for use in non-motoring application

I don't know the first thing about how engines work, but am trying to make a spark with a spark plug and ignition coil controlled by a power MOSFET. While trying to find a way to connect them both, I ...
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2answers
48 views

What is the function of jumper pins on a 4 channel relay?

Attached is a picture of a 4 channel relay. I have searched the internet for the function of the jumpers circled in red. They are labelled Low Com and High. On all sites which I have looked at they ...
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0answers
25 views

Electrical component most likely to fail in window AC unit after power surge?

I have a window AC unit, 115 VAC, 10 amps. Power went out earlier in the week due to the big storm on the east coast and once it came back on every LED on the control panel was lit (not typical) and ...
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1answer
366 views

What are the LENOVO YOGA 3 USB-like inlet 20V 2A wiring/signal/voltage specs?

I have an unknown-history Lenovo Yoga 3 Fold-Back Keyboard Laptop that I am trying to charge/test/repair I and don't have a OEM or aftermarket power adapter. The power input site looks like a usual ...
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1answer
22 views

AC Harmonics on a system appearing as DC

I have a theoretical question about harmonics and DC. Given I have a circuit which has a power supply providing an AC input(230Vrms @ 50Hz), this then goes into a load which, takes this supply ...
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0answers
29 views

Low accuracy current feedback measurement in motor control

Given a very low accuracy current sensor in a 3 phase inverter (in my case used for motor control) what is the best way to tackle the issue and keep reasonable performance and robustness at the same ...
1
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1answer
25 views

AC voltage b/w DC power supply o/p and Ground

I have various Phoenix Contact Mini DC Power supply units (Pheonix Contact MINI-PS-100-240AC-5DC). It gives the correct DC Voltage across output terminals, as its supposed to. But I also noticed that ...
4
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2answers
92 views

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 ...
1
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1answer
23 views

Why do most BMS systems for li-ions and li-pos stop discharging at 2.5V? Are there better systems or is this the standard

From what i've read online, 3.0V is the absolute maximum li-ion and li-po batteries should be discharged and around 3.2-3.4 is preferable for preserving battery life. if that is the case, then why is ...
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1answer
72 views

What is this gigantic high-tech cylinder in the corner of a middle-class Chinese family's living/dining room in Shanghai? [closed]

My guess is that it has something to do with the climate, but why is it so big and cylinder-shaped? I guess it could actually be a fridge, but it looks too oddly shaped to be that. But maybe. The room ...
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1answer
25 views

Emulate normally closed relay with 2 normally open relays

Good afternoon, I have recently ordered a normally closed relay to fix on my car's daylight-running lights. When the main lights come on the DLR should switch-off. Unfortunately amazon has delivered ...
1
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1answer
46 views

Is it still a bad idea to keep modern electronics plugged into the charger cable for longer than necessary?

I have an "DaVinci IQ" portable vaporizer. Since the battery quickly runs out of power, I often keep it lying next to me, plugging from the computer into its USB-to-Mini-USB (or maybe it's Micro-USB --...
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1answer
41 views

What's the function of those coils there?

What do they do? The aux contacts are normally open and the device is MR PQM 500 reactive power compensation system.
2
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1answer
14 views

Maximum amps from a switching voltage regulator

Looking at a part like this LM2596 It is rated for 3Amps with a voltage range from 3.3-12 volts. Does that mean that this voltage regulator will only output a maximum of 3amps?
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2answers
110 views

Designing a loaded voltage divider?

I was wondering how to design this circuit in depth, since I have no idea what to do.
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2answers
385 views

Why is it bad to run power through BNC (RG58) cables?

A standard practice in many academic labs, which I'm told is "bad practice", is to use RG58 cables (i.e. standard BNC cables) for power distribution. Question 1: Why is this considered bad practice?...
2
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1answer
119 views

How do multiple enphase microinverters stay synced to the grid?

In a prior question it was established that any string or microinverter that is grid tied must put out sinusodial power. But there is also the task of being in sync with the grid. It seems from ...
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0answers
29 views

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 , ...
1
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1answer
60 views

Electronic symboles in datasheets

I found these symbols in a electronic datasheet.. Are these all logic gates? or another?
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2answers
58 views

Electronic component datasheet handling

What is $V_{IH}$ and $V_{IL}$ in datasheets? I found High-level input voltage and Low-level input voltage on the datasheet?
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1answer
43 views

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?
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1answer
8k views

How to detect what wattage that my Windows laptop is receiving via USB-PD?

I don't know too much about USB-PD. I understood that USB-PD requires negotiation between the charger and the receiver. So probably my Windows laptop (Dell XPS 9570) should be able to know the current ...
2
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1answer
113 views

Why does collector current increase with base current in BJT?

The base current in the BJT is due to the recombination of holes and electrons. To neutralize the p region an electron leaves the p region. If we take it the other way round, the larger the base ...
2
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1answer
130 views

Why/when is AC-DC-AC conversion superior to direct AC-AC conversion?

I am currently studying wind power and the power electronics used for it. In wind power a generator is driven by wind, thus the resulting power is of widely varying frequency and amplitude. The power ...
1
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1answer
57 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
33 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.
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1answer
2k 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
75 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
123 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 ...
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1answer
41 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? ...
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0answers
127 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 ...
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0answers
71 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 ...
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0answers
19 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 ...
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2answers
316 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
160 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 ...
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2answers
568 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 ...
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1answer
46 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 ...
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2answers
70 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 ...
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1answer
62 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
83 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 ...
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0answers
30 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 ...