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.

1
vote
2answers
39 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
53 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
40 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
35 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
93 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
82 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
29 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
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 ...
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
0
votes
0answers
18 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 ...
0
votes
2answers
79 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
157 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
39 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
53 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
73 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
44 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
37 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 ...
1
vote
1answer
68 views

Power Switching using MOSFET and opamp

I'm trying to understand the Arduino design. LM358 and FDN306P is connected in between USB input and primary source input. In presence of USB and primary supply the Arduino mega board is drawing ...
2
votes
2answers
49 views

Feed-forward capacitor in SMPS feedback

I was looking at the TPS63700 DC-DC inverter datasheet and stumbled across the schematic below. It is a more or less usual buck-boost inverter topology schematic, except for the weird R4 and C3 ...
1
vote
1answer
37 views

Is there an industry-wide name for anti-parallel diodes across an IGBT module's collector and emitter?

For example, this datasheet refers to a 'freewheeling' diode and a 'boost' diode. The upper diode is the freewheeling diode, right? If you wanted to switch an inductive load with a single such module,...
2
votes
1answer
67 views

Zeta topology DC-DC converter unstable

So I've tried to build a Zeta topology DC-DC converter based on a simple buck converter IC XL4016, which works perfectly in a regular buck topology. However, when hooked up in a Zeta topology as shown ...
1
vote
1answer
40 views

Do thermal cutoffs exist that would work with a line that is 40-75V 0.5A and a max temp of ~85°C?

I have a bunch of COB LEDs that I am going to wire in series using an LED driver. The driver gives off between 40-75V and 0.5A max. The circuit should run around 70V and 0.5A. Due to space ...
0
votes
1answer
86 views

Problem with IR2112 on Proteus

I am designing a pure sine wave innverter and am using IR2110 as a driver for the H-bridge. On protues however only IR2112 is available so i used it. I managed to get all the connections in a correct ...
3
votes
0answers
70 views

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 ...
0
votes
0answers
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 ...
-1
votes
2answers
80 views

Do electronic devices require more current when alkaline batteries goes low?

I know that alkaline batteries' voltages go down when they're at low charge (from 1.5V~1.7V to 1.0V). For typical electronic devices like remote controls or bluetooth mouses/keyboards (that uses two ...
0
votes
2answers
95 views

Why is my oscilloscope reading jittering, and how might I fix it?

I've made a simple inverter circuit and I've read the voltage across the load resistor using a RIGOL DS1104 oscilloscope. Here is the link to the screen capture. I'm using a full-bridge inverter ...
0
votes
1answer
121 views

How much current does an 1602 LCD draw? [closed]

I want to know how much current a 16x2 (1602) LCD draws when the backlight is OFF and ON? NB: My multimeter is broken.
-3
votes
1answer
84 views

Need help to newbie to understand MIL-STD-461 [closed]

why only 10khz-10Mhz is used for CE102 test ? why not other frequency range is used for CE102 test ?
0
votes
1answer
111 views

Controlling the Spark plug using 555 IC

I built the circuit for ignition system using MOSFET, 555, ignition coil(specs unknown. But current rating is more than 2 A and less than 10 A), SMPS(12 V, 10 A for powering the the whole circuit). ...
1
vote
1answer
123 views

How were Power Bank limits decided by airlines?

Why is a 160Wh power bank considered safe to carry on board, but not 170Wh, for example? What defines this maximum safety limit, how was it determined? Obviously airlines across the globe have agreed ...
2
votes
3answers
310 views

What is the technical name for fan that produces electricity?

I'm wanting to create a wind powered LED similar to this one, but weather proof. I know there's tons of them out there, but I'm wanting to build it from scratch. My issue is that I'm completely ...
0
votes
1answer
49 views

RS485 Functionality difference

I would like to major difference between these ICS. Max 485 Low power Slew rate limited SN75176 :Differential Bus Transceiver ADM 2483 Differential Bus Transceiver ADM 2483 is Isolated type power ...
0
votes
0answers
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 ...
2
votes
0answers
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 ...
1
vote
3answers
76 views

Triac Dimmer Supplying a Purely Inductive load

I was asked a question in my lab viva today, on a triac switch supplying a fixed value inductor of 0.2 henry. How will the current and voltage of the inductor vary, if the triac's firing angle was ...
1
vote
0answers
30 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 ,...
0
votes
3answers
197 views

Wireless power transfer - Inductive vs. resonant mode

When talking about how wireless power transfer is done, the standards (e.g Qi) distinguish between inductive and resonant mode. (Link) They claim that when the units are in very close proximity it is ...
3
votes
4answers
197 views

Burning a Power MOSFET

We are doing battery heat testing and want to be able to vary the current in the circuit to different test points up to 100A. Our circuit schematic is attached. The MOSFET is IXFN360N10T. We attached ...
1
vote
1answer
53 views

DC choppers output voltage in ccm and dcm mode with no load

I was wondering what would happen to the steady state output voltages and currents of the Buck, Boost and the Buck-Boost converters, working in 1 - Continuous conduction mode (CCM), 2 - ...
0
votes
1answer
66 views

How to increase low voltages modified AC Sine wave up to 220 VAC with 0.25 Watt?

I am working on Multilevel Inverter and successfully achieved modified sine wave with 7 level, that is much better according to my requirement. But the problem is output AC voltages is too low which ...
2
votes
3answers
103 views

Can someone please help me with these questions on DC Chopper Circuits?

I had a quiz on power electronics and the following questions were asked: Question 1: Consider the buck chopper in Figure 1, operating at 100 kHz frequency, with the switch duty ratio of 0.5 and ...
1
vote
0answers
33 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 ...