Podcast #128: We chat with Kent C Dodds about why he loves React and discuss what life was like in the dark days before Git. Listen now.

Questions tagged [power-electronics]

Refers to the conversion of electric power by using solid state components such as semiconductors. Can also generally apply to the field of electrical engineering which works with power electronics.

282 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
1
vote
0answers
86 views

Finding Width of MOSFET

We are struggling with part iv of the question above where we have to find the width of both MOSFETS. As you can see from our working out, we have found a width of 2 meters for the nMOS, which we know ...
1
vote
0answers
67 views

Discrepancy between simulation and measurement for a voltage doubler/ rectifier design at 5.8 GHz

I am designing a pretty straight-forward voltage doubler at 5.8 GHz with MACOM's MA4E1317 diode, which I have used before and know from previous experience that matches pretty well with the spice ...
1
vote
0answers
394 views

Overvoltage protection circuitry choice

I need to design a input overvoltage protection for a 45W DC-DC converter rated for a 9-24V wall wart input (so, 45W / 9V = 5A input current at max). So far I've seen two approaches (schematics below):...
1
vote
0answers
342 views

IGBT failure and protection

I have a 3-phase bridge rectifier (shown below). I am using an IGBT (STGE200NB60S) to limit the inrush current from the capacitors at start up. I also added the NTC thermisters to help with the inrush ...
1
vote
0answers
70 views

Can a CM choke saturate due to the leakage inductance?

On a 3-phase common-mode choke, if the three currents sum to zero, then it will theoretically never saturate. I understand that the leakage inductance stores energy in the core. Can the three phases ...
1
vote
0answers
94 views

Are there commonly used equations for short-term overpower of wirewound resistors?

If I have a wirewound resistor rated for 250 W that might need to dissipate, say, 400 W for several seconds, is there a commonly used equation for finding its temperature rise or time to failure under ...
1
vote
2answers
79 views

Selecting suitable relay for car fuel pump

I am working on a project in which i will control the car fuel pump using relay to turn it on or off. I want the relay to be suitable for keeping the fuel pump continously working for over 15 hours ...
1
vote
1answer
176 views

How to design for electrical connection for a food dryer

I am on this project in building food dryer to dry 2 kg fish cracker maximum per use. Based on the calculation, I only need to use power of approximately 60 watt for the heating to achieve the energy ...
1
vote
0answers
249 views

What is happening to this vacuum tube?

I’m trying to repair a 63 year old record player. Opening it up, all of the electronics have aged badly, except for the drive motor, which is basic enough that it operates properly. I know enough ...
1
vote
1answer
330 views

Average current mode control compensation

This is the structure of average current mode control (source here). Please look at signal \$V_{com}\$ at the positive input of PWM modulator. For proper operation, in steady state the magnitude of ...
1
vote
1answer
97 views

Power IR2110 from a low voltage AC Source

I am trying to power the IR2110 using an AC Source. However, this source is also connected to a full wave bridge rectifier that's going to supply a controlled buck converter. I tried using a voltage ...
1
vote
2answers
76 views

AC capacitor computational problem using calculus

A current is flowing through an ideal capacitor, C = 25μF, the current waveform is a sawtooth. I need to find the formulas that plot the voltage waveform ,which is also shown in the figure,right below ...
1
vote
0answers
324 views

Soft-Start Circuit with Premature Loading

BACKGROUND I am designing a board to convert high voltage (~400V) DC down to medium voltage (~30V) DC to provide power to subsequent boards. In its simplest form, my board will consist of the DC/DC ...
1
vote
0answers
707 views

HF arc starter and full bridge IGBT driver protection

Had developed HF arc starter scheme and it worked fine until I accidentally pressed arc start push button when circuit was shorted (torch stick on work peace). After that all 4 IGBTs in my inverter ...
1
vote
0answers
70 views

Cable Equations and/or Calculations

So, I'm on a placement as part of my final year of a Masters of Engineering Programme and the company have given me a task concerning a fault they may or may not have with one of their cables. ...
1
vote
1answer
477 views

Interface Submersible water pump with microcontroller using Contactor Relay

I am making a automatic water level controller for my home,I am new to Electrical Engineering and learning things. I am using a MCU to turn ON/OFF submersible water pumps using some float switch to ...
1
vote
1answer
351 views

dq0 Transformation Interpretation

What is the physical interpretation of dq0 axis transformation in electrical machines and power systems? How does this transformation helps? Thanks
1
vote
0answers
117 views

Transistor parrallel to Voltage Regulator

I'm encounter following schematic in a product. It gets 110VAC and provide 5V DC to the board. After many inspection I still can't understand what Q2 and R4 do in this design. First of all after T1, ...
1
vote
0answers
114 views

Without converting the secondary side to “Y”, how would one solve this question?

The question: "A three-phase 230 V, 27 kVA, 0.9 PF (lagging) load is supplied by three 10 kVA, 1330/230 V, 60 Hz transformers connected in Y-Δ by means of a common three-phase feeder whose impedance ...
1
vote
0answers
311 views

Protection of Energy Meter from 35KV spark

I have been building a prototype of an energy meter for a project. One of the aims of the project is to make sure the energy meter can withstand a 35KV Spark applied to it. I was wondering how this ...
1
vote
1answer
170 views

Transformer Design Using AP Method and Construction

I am designing a transformer for a traction inverter using the AP method. 1) I have chosen a Metglas core with a saturation flux of 1.56 Tesla. I have chosen a operating flux density of 0.6 Tesla. ...
1
vote
1answer
65 views

How to prevent signal waveform from going towards negative side when increasing gain

I have managed to design a circuit: that is able to read an ECG signal where the signal is then acquired through a DAQ called TiePie. From there, the signal is then digitally processed (HPF,50Hz ...
1
vote
0answers
110 views

Question about various power/ground sources in one circuit

I would like some advice on how to handle different power/ground lines on the same circuit. I am not clear about how to wire-up multiple peripherals etc. with their own power sources in a single ...
1
vote
0answers
77 views

Closed enclosure thermal design the right way

I have a circuit board that works quite well (processor, screen, power supply). It has been tested successfully for an open aluminium enclosure, but now it will need to fit a rugged 100% closed box. ...
1
vote
0answers
135 views

Should I use a current injection method or voltage injection method?

I am currently designing an earth fault detection system for 110V DC transmission line. As you can see in the diagram, I have a long line of monitoring equipment powering these monitors (which I will ...
1
vote
0answers
77 views

P-Ch high side switch output drop?

I am making a cutoff switch for a SLA battery using the this circuit V2 is the SLA battery, V5 is 0V or 5V coming from a some other logic circuitry. The simulation comes out fine. I understand that ...
1
vote
0answers
554 views

How to switch between two 220VAC motor power supplies?

I am not an electrician, electronics engineer or anything that will relate me with your interesting profession, but I am a Project Engineer, Mechanical Engineer, etc. and I am working in my spare time ...
1
vote
0answers
148 views

boost and flyback converter

I am currently analysing this circuit But I ran into some problem since the boost component standalone raises the voltage to 40v the flyback is suppose to bring up the voltage to a further 540v ...
1
vote
0answers
271 views

Short circuit protection

I have built an AC/AC cuk converter for an assignment I am doing. It works as such, I provide 50V AC in and I get an adjustable voltage out from 0V to 50V AC, depending on the duty cycle of the PWM ...
1
vote
0answers
3k views

What is a Thyristor Switched Series Capacitor (TSSC)?

I'm struggling to understand the physical difference between the Thyristor Switched Series Capacitor (TSSC) and the Thyristor Controlled Series Capacitor (TCSC). From this book, I understand that a ...
1
vote
0answers
174 views

How to add a desirable phase shift in the input from 3-phase ac mains?

I want to build a 12 pulse rectifier circuit. I know delta-wye or wye-delta transformers can be used to add phase shifts equal to the multiples of 30, but I don't want to use transformers. Is there ...
1
vote
0answers
575 views

Arduino building a pulse proportional thermostat

I'm not much of an engineer, but I have worked with arduino. I'm looking to see if it's possible to build a pulse proportional thermostat with a probe and an arduino. Any recommendations on where to ...
1
vote
0answers
278 views

power supply frequency response

I have a question regarding the frequency response of a boost converter. I am curious to know what causes the "blip" at around 8kHz that causes the response to go up and then back down. At first, I ...
1
vote
1answer
104 views

How does headphone volume correspond to driver excursion?

I was curious about how driver excursion in a headphone corresponds to the volume that music is playing at. For this question, let's use my current headphone as an example. It's the Audio Technica ...
0
votes
1answer
16 views

Pull up resistor selection for LIN bus

What exactly will happen if I use 1.2K ohms at LIN master node pull-up? Why does the LIN protocol spec recommend to use 1K typically?
0
votes
0answers
18 views

Why do we require isolated supplies for gate drivers in 3-phase inveters?

I have used isolated supplies while making optocouplers based drive circuitry for driving 6 IGBT switches in 3-phase VSI in my undergrad projects. I remember my professor kind of explained why exactly ...
0
votes
0answers
42 views

Is it safe to make common ground between multiple voltage planes

I have a system where I have two power inputs and a single power output. One input from a battery(13v, 10A max) and one from solar cells(19v, 10A max). Then there is an 12v output which I connect to a ...
0
votes
0answers
28 views

Component selection on the ZETA converter

I am absolutely beginner for power electrical engineering. I need a help. I have input, output voltage, load resistance, output voltage pulsation(percent), and inductor current pulsation. How to ...
0
votes
0answers
46 views

Is the switching speed of MOSFET comparable to that of a Schottky diode?

Assuming identical voltage and current rating, which is having higher switching speed? MOSFET or Schottky diode? In synchronous buck converter, we replace Schottky diode with MOSFET (low side) for ...
0
votes
1answer
45 views

Waveform of a buck converter

DE is a capacitive load. In a source the waveforms of the buck converter are given as: On state Off-state I am confused about the waveform of \$v_{dS}\$. On Wikipedia the waveform is shown ...
0
votes
0answers
27 views

How do I calculate deformant and real power of this circuit?

I have this circuit, the load is RL: I need to calculate the apparent, real, reactive and deformant power assuming L is very large. Since L is very large that means Q= 0 var and Pload=~Uav*Iav and S=...
0
votes
0answers
29 views

Calculating the value of current-limiting reactor in single phase dual converter

I'm having a problem calculating the reactor's value in single phase dual converter. As you may know, the reactor shown in the picture below is to limit circulating current caused by the voltage ...
0
votes
1answer
36 views

Constant current and constant voltage control of inverter

Most of inverters in the grid are based on constant current control where inner current control loop tries to limit the current. Hence acting as a constant current source. I was wondering how control ...
0
votes
0answers
27 views

Line and load regulation testing of flyback converter

I have designed a flyback converter with dual outputs. I have the following queries for performing line & load regulation tests for the same. 1)To perform line regulation on 25 V rail, should I ...
0
votes
0answers
55 views

Thyristors problem in a 1800v capacitor discharge system

I have two thyristors “R1275nc21x, they are Westcode thyristor and have some issues in my application. I want to make a capacitor draining system with 1800V charged and it can discharge to the coil (...
0
votes
2answers
47 views

Does ideal Transformer transfer DC input voltage to secondary side, under NO-Load and Loaded condition?

Does ideal Transformer transfer DC input voltage to the secondary side, under NO-Load and Loaded condition? please you take DC input for a long time. Also consider two more conditions, 1st: for ...
0
votes
2answers
38 views

Low Dropout Regulator Enable Delay

I have a main buck DCDC 5V that feeds to five different LDOs(3.3V). To create power sequencing, I would like to use a resistor and a capacitor at the input of the enable pin of each LDOs and by ...
0
votes
1answer
31 views

How to measure correctly efficiency at high load with LT8646

i'm trying to measure efficiency of a LT Part LT8646 at high load with the attached schematic. i'm using a dynamic load and a power supply to give 12V. I'm using a digital multimeter to read the ...
0
votes
0answers
75 views

Control of battery charging

I have been developing a control software for charging and discharging battery in a dc grid. The system consists of: 01) Three phase alternator with three phase diode bridge rectifier at its output ...
0
votes
0answers
24 views

Can I use a soft switching IGBT (FGA 25n120: given in specification) for my variable frequency drive power circuit (frequency around 10-20kHz)?

I am building a variable frequency drive from scratch. The design worked well with switching MOSFET. Now I need to increase the power output and DC bus voltage so that I would like to implement ...