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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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Safety Capacitor Selection

When selecting an X2 safety capacitor what must be taken into consideration. There are only a few types of capacitance ranges and seem to be chosen based on voltage rather than capacitance. Take ...
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56 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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48 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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208 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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96 views

Using Power Good pins for sequencing

I'm trying to figure out a way to use the Power Good outputs of several stages of voltage regulators to sequence and monitor a board powering several FPGAs. I've done this easily before with a ...
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71 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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29 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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32 views

Design methodology - Single-Phase vs Three-Phase Inverter

I simulated a small DC Microgrid in Matlab/Simulink. In order to connect the DC bus of the microgrid to the AC grid, I used a three-phase - two-level inverter. I have done some research and I found ...
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122 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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40 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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86 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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177 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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161 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 ...
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206 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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50 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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82 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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317 views

Can we use 125VAC 20A switch in place of 12VDC 20A switch?

Can we use 125VAC 20A switch in place of 12VDC 20A switch? I have searched my local market and found 125VAC 20A switch. Can i use this AC switch in place of 12V 20A switch as it is not available in ...
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453 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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109 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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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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230 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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104 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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70 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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117 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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73 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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521 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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134 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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255 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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2k 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 ...
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165 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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551 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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270 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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26 views

Injection of active and reactive power for votlage regulation

I am currently investigating voltage regulation by injecting/absorbing active/reactive power through grid-tie inverters as you can see in the figure below. So, I am conducting some simulations in ...
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Why Distortion Factor (g) is Xo1/Xor and not Xor/Xo1..?

In power electronic convertors (rectifiers) we measure nonlinearities injected into the system by means of 1) Distortion factor(g) : g = Io1/Ior { fundamental component / rms component } 2) Total ...
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Need help checking the schematic of buck converter

I designed this circuit to work as a buck converter, using atmega32a as a controller to get PWM with 500k HZ and 47% duty cycle, my problem is that I am not sure how to connect between the control ...
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29 views

What is the voltage gain of the converter

Please refer the following figure: This is a small signal circuit model of a converter. The volatge gain( vo/vin) I am finding is not as it should be. I think I am doing something wrong in ...
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42 views

Low Battery Relay

I need to detect SLA battery voltage & when the battery comes closer to 10.5V the relay must turn ON.The below circuit works ok, but the hysteresis gap is pretty closer, when I touch the circuit ...
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35 views

Altium 18 - Show route tool path in 3d layout mode

I want a 3d view of the route tool path in Altium designer. I created a rout tool path using: Design » Board Shape » Create Primitives From Board Shape But when i define my route tool path layer, ...
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Parallel Triac driving same Inductive Load NOT Working?

As per the schematic two same value triacs and driver circuits are connected parallel, Triacs are BTA24 and Opto-couplers are moc3021 and the load is inductive, when i trigger the MOC U1 the Triac Q1 ...
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28 views

How to find a correction factor of instruments (wattmeter, multimeter)?

I'm interested in measuring the hysteresis loss and copper loss of a power transformer, here you can see my circuit: The internal resistance of the wattmeter and the multimeter (right hand side) is ...
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Derive an expression for the current of a RLE rectifier

I'm trying to calculate an expression for this RLE rectifier: simulate this circuit – Schematic created using CircuitLab With \$R=2 \Omega\$ \$L=20 mH\$ \$V_{DC}=100 V\$ \$V_{m}=120 V\$ \$...
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19 views

cannot find high cut-off frequency from multisim

for the above circuit i cannot find the high cut off frequency by doing an AC sweep first picture is the frequency response. There is no dip seen for the fH.
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34 views

2 MOSFET DC to AC Inverter Design (Wireless Charging)

For one of my projects, I am trying to create a wireless charging station for a LiPo battery. For my input, I'm taking the standard 120 Vrms, 60 Hz voltage source I get from a outlet. From initial ...
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36 views

In NMOS inverter with enhancement load, why the load is always saturated?

Why the load in NMOS with enhancement is always in saturated mode?
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21 views

Rectifier Design RL load

I have a design problem with the circuit below, in order get the commutation angle u I need a value of Ls, assuming all other values are known in the formula below. As far as I know, Ls & u are ...
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18 views

Clarke transformation for delta wiring

I find the transform to get alpha,beta and zero for Y wiring(image below), but didn`t find the transformation for delta wiring(Vab,Vbc,Vca). Someone know the tranformation for delta case?
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Gate voltage of power semiconductor devices in datasheets

Many static characteristics of power semiconductor devices are presented in available datasheets at a specific gate voltage. For example, they are achieved at Vge=15V for IGBT devices and Vgs=20V for ...
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60 views

A question on MOSFETS with gates tied together

I was randomly reading about a fact that when the gate of one n-channel MOSFET is connected to the gate of another, one NMOS must be in linear region of operation and the other in saturation. Also, ...
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35 views

Problem opening a PLECS blockset in MATLAB

A friend of mine sent his simulation of a converter for which he had used PLECS. It is in the format "example.slx". I have MATLAB R2017b. I downloaded the PLECS block set for MATLAB and activated it ...
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36 views

DC-DC bidirectional converter buck configuration

I am looking to solve the low frequency mismatch between the input power and output power of a single phase inverter. This is usually done with a very large electrolytic capacitor. I am looking to ...