Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

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.

0
votes
0answers
14 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, ...
0
votes
0answers
19 views

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 ...
0
votes
2answers
136 views

Why sometimes some PCB designer add extra traces to connect two pin to each other?

I've checked a PCB board which has designed by very famous company and I saw something weird.They connected two pin to each other 2 times and from the top and the bottom of the board I am going to ...
0
votes
0answers
23 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 ...
-1
votes
0answers
21 views

Flyback converter boosting operation failure

I have designed a 20W flyback converter, in the open loop operation, when the duty ratio is below 0.5 it works perfectly (hardware not simulation). But when I go above 0.5 , that is in boosting mode, ...
0
votes
1answer
47 views

what is the German/Austrian nomenclature(Voltage and current direction) in electronic circuit?

AS I came from a country where we use the french system in defining the voltage current arrows in electronic circuit, I am confused about the German/Austrian system where I see the voltage arrow is ...
0
votes
0answers
27 views

volt-second balance and capacitor charge balance [on hold]

can anyone help with understanding volt-second balance and capacitor charge balance please? Im studying dc-dc converters
2
votes
2answers
67 views

How to deal with “peaks” voltages in mosfet in boost converter?

I'm designing a Boost Converter to go from 5 [V] to 12 [V]. The design I came with is the following: To understand better the design, please note the following: 1) To drive the mosfet I'm using a ...
1
vote
1answer
32 views

Difference series resonant and LLC DC/DC converter

What is the exact difference between a series LC resonant converter and an LLC converter. From a topological perspective, they seem to be exactly the same. I believe that for an LLC, also the ...
1
vote
1answer
32 views

Can i use an AC 15A 250V / 30A 125V rocker in place of a 15A 125V / 10A 250V one?

Amazon sent me the wrong replacement switch so i am wondering if i can use it? Original switch is AC 15A 125V / 10A 250V new one is AC 15A 250V / 30A 125V can i use it without damaging the ...
0
votes
0answers
13 views

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\$ \$...
0
votes
0answers
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.
0
votes
1answer
79 views

if I input 3.0 - 4.0 v from a lipo battery, can I get 24.0 to 25.0 v as output? [on hold]

I'm working on a volunteer project for which I'm already funded based on my proposal (that is to say, I have limited funds) I'm also not so good in electronics and I've been self-taught so far. I got ...
0
votes
0answers
28 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 ...
1
vote
1answer
32 views

How does the transistor topology look like for a gate of this logic inverter?

How does a single inverter gate of this hex inverter, look like in transistor level? I don't mean the actual photo, but how does the transistor topology look like? Does the BJT inverter (see below),...
1
vote
0answers
62 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):...
3
votes
1answer
84 views

High-side vs low-side reverse polarity protection

I need to make a reverse polarity and over-voltage protection for a fairly powerful device (45W @ 12V input) and after some research I noticed a weird peculiarity. A typical reverse polarity ...
0
votes
1answer
44 views

how to design AC line filter for VFD?

I am working on VFD for single phase induction motor. I am rectifying AC 220V directly to DC link capacitor. There is no LC filter from AC mains. There are harmonics in the AC mains. Can you suggest ...
0
votes
0answers
34 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?
4
votes
2answers
79 views

Flyback Converter Capacitor Value selection with given ripple voltage limit

I need to design a flyback converter for my project. In my design the output voltage is 15 V. I calculated all the parameters including inductance values, diodes selection etc. However there is a ...
0
votes
0answers
19 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 ...
0
votes
0answers
16 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?
0
votes
2answers
108 views

Short-circuiting the primary coil of a transformer to keep it warm

I saw this problem somewhere and I wanted to give it a try, but the numbers I've got seem to be pretty outlying. We have a 25kV / 4160V transformer which is out of circuit for now. To protect it ...
1
vote
1answer
78 views

How can charging current be understood intuitively?

The charging current I’m talking about would be the one between un-shorted phases and ground when there is a short to ground in one of the phases in a distribution network or facility. I'm not talking ...
-1
votes
0answers
22 views

Why am I not seeing pedestal in this graph? (Manual of DAQ software and FEB attached)

I am using CAEN DT5702 FEB(Front End Board) for SiPM luminosity measurement. Although everything has been worked out so far (with help of SE users!), I need 1 more question about DAQ graph that I ...
1
vote
2answers
36 views

How do the areas of the emitter, base and collector affect their respective currents?

I want to know what will be the effect on current if we change(increase or decrease) the area of the emitter, base, and collector. For example, if we double the emitter area what will be the effect on ...
-2
votes
1answer
51 views

Inductor power choke

I'm looking for this inductor 10 µH. Need help to recognize series model of this IC's inductor.
-1
votes
1answer
37 views

What happens to the low cut off frequency when replaced with a larger bypass capacitor?

When the emitter capacitance is increased to 100 microfarads. What would happen to the low frequency cut off of this amplifier?
0
votes
1answer
32 views

4.5µA Li-Ion Battery Protection Circuit

I tried to simulate the circuit given in your design note "https://www.analog.com/en/technical-articles/battery-protection-circuit.html" According to the designer, the cut off voltage is 3V but the ...
3
votes
1answer
90 views

What could cause the mosfet to burn out in my motor driver?

Here's the schematic: I've tried to make this motor driver as tough as possible, but I'm still seeing occasional failures where the MOSFET and the diode D1 are both failed short. Any ideas what ...
2
votes
1answer
68 views

Fourier Series Expansion of the phase current of a three phase full wave bridge rectifier

I am really struggling with this homework problem where I am asked to calculate the harmonic components as a ratio of the first fundamental harmonic of the phase current of a three phase rectifier ...
1
vote
1answer
26 views

Power converters Modelling - NPC versus no NPC

I am trying to simulate a three-phase inverter in Matlab/Simulink. So far I figured out that in the Simulink library there are two types of inverters. The first one is illustrated in the figure below ...
2
votes
1answer
49 views

Energy loss by Hysteresis

I recently did an experiment aiming to verify the magnetization curve of the cores of a single-phase electrical transformer. I applied a sine within one core and I observed this one and the other one ...
2
votes
0answers
53 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 ...
0
votes
2answers
30 views

Bjt for trigger MOSFET

I my project MOSFET need 13 v 65% PWM to trigger but controller output is 5 volt then how can I amplify this in voltage
-1
votes
0answers
45 views

Allegro A4490 triple output regulator - unexpected output voltages

I am having problems with this schematic using the Allegro A4490 voltage regulator (home page, datasheet). Can anybody figure out what I am doing wrong here? I have no clue. I have been searching for ...
0
votes
0answers
17 views

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 ...
-3
votes
1answer
44 views

how rubber keypad works [closed]

Press on the keyboard, how does he connect the circuit of this key? Two thin films, coated with conductive rubber circuit, with a thin film in the middle, with holes, used to isolate two thin films ...
1
vote
2answers
67 views

Virtual Short Concept in an Op-Amp

By virtue of the open-loop gain being infinity for an ideal op-amp, the two input terminals are said to be virtually shorted. Yet, the virtual short concept is only applied to op-amps in negative ...
1
vote
3answers
156 views

Is this a selenium rectifier?

The item below is one of two components of an old (c 1950?) electric chisel. (The other part is a reciprocating solenoid.) The name tag on this part says "Electric Converter", with a 6 amp rating. ...
3
votes
1answer
62 views

Problem while simulating EMI Filter for power lines

I was designing an EMI Filter for the CE102 standard. I was a bit confused on how to provide noise source to the circuit, since (as of my knowledge) EMI noise enters our system by parasitic ...
0
votes
1answer
31 views

Enhancement type MOSFET - channel formation

In an enhancement type MOSFET (an n channel one assumed here), when a positive gate to source voltage is applied, the holes of the substrate near the gate move deeper into the substrate away from the ...
0
votes
1answer
37 views

Question on MOSFET - small signal model

In the small signal model of a MOSFET, the current from the drain to the source (for an n channel MOSFET) is a function of the gate to source voltage only. But, if a positive voltage was not applied ...
0
votes
0answers
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, ...
0
votes
2answers
52 views

Rectifier, Flyback vs Transformer, Rectifier, Buck

I've just finished doing my first off-line flyback, which proved a success. A simple block diagram is as follows: I know this topology seems common now, for example it is used in Apple USB Charger ...
1
vote
1answer
68 views

Placement of feedback line on DC DC converter, before or after cap? (and dropout problem with LT8390)

I am using an LT8390 DC to DC converter, I have a highly inductive load and it is causing dips. The dips are shown here (and about a 6V drop for 7ms): I need to get rid of the dips, which I will ...
0
votes
1answer
38 views

Why the voltage suddenly reduces when thyristors change from forward blocking to conduction mode

As per the diagram: v-I characteristics of SCR is a graph of anode current I A on y-axis & anode to cathode Voltage plotted on x-axis v-I characteristics can be split into two parts namely ...
0
votes
1answer
20 views

Can a DFIG operate in a synchronous speed?

A DFIG can operate in both sub and super synchronous modes. Can a DFIG also operate (stable) in a synchronous speed? If so, would the rotor current (as decided by IGBT switching) be DC since the rotor ...
0
votes
1answer
36 views

Reactive Power in grid side converter for Doubly fed induction generator

Does the grid side converter in a DFIG absorb/provide reactive power or is it reactive neutral? Also, what can we say about reactive power exchange in the rotor side converter?
1
vote
1answer
45 views

How to wire together 3 power supplies for 3 different pd rails with the same reference 0v

How would I wire together 3 bench power supplies to get potential differences of +12, +24 and -6V, all with respect to the same 0V? All 3 of the bench power supplies have positive, negative and ground ...