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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.

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Alternate uses for Gate Driver - Driving a Load without External IGBT or FET

What issues would one encounter by using a gate driver IC to directly drive a load instead of using it to drive transistors? For consideration would be the very affordable Infineon 2EDN752x series ...
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How does a electropermanent magnet work?

I’m trying to wrap my head around electropermanent magnetism. I read this wonderful PhD Thesis by Ara Knaian as well as details the history of this concept as well as Kyle Gilpin, Ara Knaian, and ...
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66 views

High frequency switching applications

I was reading that for high frequency switching applications with semiconductors, the ratio of the electron to hole mobility should be high. Why is it so? Is it a necessary condition always? Or ...
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59 views

How does a MOSFET conduct in saturation region?

It is a simple question but I could not find a straightforward answer. When a MOSFET enters saturation region, the channel length starts to decrease, and the channel width is the smallest near the ...
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255 views

Ceramic capacitor in High voltage DC link

In motor drive application the high voltage dc link between the rectifier and the inverter usually have: a bank of aluminium electrolytic capacitor a film capacitor near the inverter Is there a ...
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22 views

What does 'Rectifier Loading Effect and Loading Factor' mean

I came across the terms 'Rectifier Loading Effect' and 'Rectifier Loading Factor' when reading IEEE Std 421.5-2005 Recommended Model for Power Stability Studies, mentioned in those ACxA models. What ...
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50 views

Cant recognise a Damaged component of switched-mode power supply

I was repairing an smps ATX power supply I found a damaged component that I could not it recognise. I thought it's a power switch since it was mounted to a heat sink along with tow D13007 NPN power ...
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47 views

Does potentiometer accuracy change with degree of movement?

I want to use a conductive plastic potentiometer for my actuator application where movement is +/- 40 degrees. As in datasheet, the potentiometer linearity is given as +/-0.2 % which I think is for ...
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22 views

Which power converter topology has higher benefit of EMI/EMC?

Which power converter topology can be best suited for EMC compliance for small power converter to be used in LED lighting products. In my context I'm using a 5W non-isolated AC-DC converter which is ...
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33 views

2 Switch Forward Converter Volt-Sec/Charge Balance

I am attempting to design a 2 switch forward converter. I understand how to do the volt-sec balance and charge balance when the converter is as shown in the ideal 2 switch forward converter below. I ...
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55 views

SVPWM for BLDC Motors: Switching Losses vs Neutral Point Voltage Swing/fluctuation

I am implementing a SVPWM (Space Vector Pulse Width Modulation) scheme for a 3-phase inverter (3 H-bridges, nothing fancy) to control a BLDC Motor. Since one can choose which zero vectors (000 or 111)...
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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 ...
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60 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 ...
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193 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):...
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34 views

DC DC converter opamp compensation

I have simple doubt. I am making a closed loop DC DC converter flyback, I am using opamp for compensation. It should be a single input single output network. Input voltage is 24-32 volt, output is 5V ,...
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246 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 ...
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52 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 ...
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89 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 ...
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197 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 ...
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274 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 ...
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59 views

What does a rising switch node peak overshoot imply about a circuit?

Unfortunately I can't share pictures or schematics, but I think I should be able to describe the problem. I am working on a 3-phase motor controller. We noticed some of our FET pairs would ...
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89 views

Can a resonant SEPIC replace impedance network in z source inverters?

Am modelling a PV system with an adaptive MPPT along with resonant SEPIC converter and a Z-source inverter. Since I am already using a converter circuit, it is confusing because it seems that ...
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565 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 ...
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65 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. ...
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112 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, ...
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98 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 ...
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264 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 ...
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106 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 ...
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76 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. ...
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126 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 ...
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76 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 ...
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540 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 ...
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140 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 ...
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263 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 ...
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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 ...
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169 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 ...
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567 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 ...
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275 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 ...
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5 views

DQ transform on AC voltage source

I have a simple AC circuit made in Simulink where a dq transform is applied to a AC voltage source which is connected to a RLC load. I understand that dq transforms are used to convert synchronous ...
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31 views

Using 19V, 3.4A power adaptor instead of prescribed 12V,3A power adaptor on an embedded box PC

I have an embedded box PC: Advantech Ark1122H. Instead of the prescribed 12V,3A power adaptor, I accidentally used a 19V,3.4A power adaptor that is supposedly for another embedded box PC. Now this PC ...
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23 views

Small power supply for nixie tube from 3.7V battery

I would like to build a nixie watch like this one I presume that this kind of watch is powered by a lipo 3.7V battery. Do you have any suggestions on how to build a step-up converter in such a small ...
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21 views

Using a single battery for robot motors and electronics

Instead of using two separate 12V SLA batteries (one for motor controllers*, one for Arduino, LEDs, sensors ...), would they work in series as one 24V battery, with a step-down converter for each ...
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31 views

SCR reverse current during switch off

In the figure below is shown the dynamic behavior of an SCR in terms of its current during switch off. I'm interested in calculating the maximum reverse current (iR in the plot). The parameters that ...
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49 views

Flyback Converter Switching MOSFET Breakdown

I am using a UC1845A to control the switching element MOSFET (FCB20N60F) which is used for a typical Flyback Converter circuit. MOSFET's drain is connected to transformer. Rarely MOSFET is not working ...
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27 views

Solar panel voltage with buck converter and mosfets?

If the input voltage of the solar panel as Vin in the picture below. if Vin is in the range of 10 V to 37V.The average voltage value in the node in yellow during switch 1 is on and switch 2 is off is ...
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41 views

Equivalent Circuit of Howland current Pump

Why is at norton circuit for Howland current pump the current source is taken as vi/R1 instead of vi/R0? Because the formula for Norton current is IL=In*(Rn/(Rl+Rn))
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33 views

driver for IRF840

I want to use MOSFET IRF840 for DC-DC converter application. I am providing PWM signal from PIC microcontroller. I have tried to simulate using IR2110 but it is not working. What type of gate driver I ...
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29 views

How to read Torque-Power diagram for an asynchronous motor

I'm sorry if my question is too stupid, but I am not able to correctly understand how to compare the information showed by the torque-power diagram with the motor test data for a 2000W Asynchronous ...
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17 views

LiIon battery discharging

I have a question regarding LiIon battery discharging. Lets say I have a battery which is connected to a dc bus via a battery charger which has a bypass contactor in parallel. The charger is ...
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40 views

Find force pull solenoid

Sorry for the previous post that was wrong. I want to knowF=(NI)^2*μ0*A/2L^2 A What is the cross-sectional area? NewRef.https://www.researchgate.net/publication/...