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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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IGBT Power Calculation in motor control application

My DC motor's nameplate says: VOLTS: 125 AMPS: 27A HP: 4 HP RPM: 5000 RPM DUTY: CONT. I chose this IGBT IKW50N60DTP to drive the motor with a PWM frequency of 5 kHz using a single-quadrant ...
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1answer
96 views

AC MOSFET switching without any diodes? [Low-Cost AC Solid-State Relay With MOSFETs]

Is it possible to switch an AC load using two MOSFETs in anti-series such as the picture below? In this mode, each MOSFET is on during one half of the wave and the other's body diode conducts to ...
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58 views

Which one is more suitable for embedded system? [on hold]

Embedded system (choose the correct option) reduces time than a microprocessor execution speeds up the data handling capability Which one is correct and why? I think the answer would be option 2 ...
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3answers
43 views

Bipolar transistor. Unknown graphs

I read a course about power transistors and I encountered these graphs The chapter is talking about safe operation of BJT. Can anyone tell me what those graphs are ? (And how to read them).
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1answer
35 views

Why on shutdown the SCR can be compared to a power diode?

I have this as a homework question and can't seem to find the answer in my notes, book or internet. I know they will behave similarly when there is a reverse polarity on both, but the way my professor ...
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3answers
67 views

Design of synchronous buck converter: What's “ripple voltage”?

I am designing a synchronous buck converter for variable input from 12 to 36 V and output fixed at 14.4 V. The power is 400 W and switching frequency is 50 kHz. While designing I came across 2 terms. ...
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22 views

SMS0408G counter code with arduino

I have searched a lot on internet but can't find anything regarding SMS0408G Please help me out to make a simple counter with SMS0408G and arduino. Thank you in advance
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19 views

DC link capacitor for induction motor drive

I am simulating FOC drive for a 5kW,400V 3-phase induction motor. The drive algorithm worked fine when inverter was fed from proper DC source of suitable value. However, in practice, the drive has to ...
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27 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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1answer
33 views

Half wave rectifier input voltage and current waveforms

ok so i am having a problem in power electronics in my book there is a circuit for a single phase half wave rectifier as shown below and also its related waveforms and then its performance ...
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1answer
29 views

0-5 to 0-12 volt level shifter at high frequency

what is the best way to shift PWM at 500kHZ from logic level 0-5 volt to 0-12 volt to drive a mosfet? answers here were no good they only work for lower frequency and pwm is distorted at 500kHZ ...
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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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1answer
35 views

Voltage controlled versus current controlled Inverter

I would like to ask about the voltage and current controlled inverters. In a current controlled inverter, the control target is the output current and they provide high quality current to the grid. ...
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40 views

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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3answers
55 views

How to turn on high-side MOSFET of a buck converter

I'm trying to simulate some buck converters with real MOSFETs instead of ideal switches. The problem is that I don't know exactly how to properly turn on the transistor. The simple buck converter ...
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1answer
36 views

Determining Battery Charging and Discharging Rate Based on Max Current and Nominal Voltage

I am having difficulty in figuring out some basic stuff and confused with multiple equations. I am working on a simulator which simulate a hybrid vehicle journey for some period of time. During ...
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1answer
173 views

What are the advantages/disavantages on using CCM or DCM in boost converter? [closed]

When should we choose continuous conduction mode (or discontinuous) when designing a boost converter?
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1answer
60 views

Power issue on connecting controller to FTDI programmer

Hi, I have connected my controller (ATMEGA2560) input to 5V power supply. At the VCC terminal 5V is shown. The VCC, TX,RX, RESET and GND pins are connected to a FTDI programmer port as shown in figure....
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1answer
30 views

How to maintain a stable voltage on a Wind Turbine for Inverter

I'm doing some experiments on a wind turbine in my spare time. At the moment, my system runs well and I can measure good output values from my generator. For example: 38V @18Hz at 30 RPM 97V @37Hz ...
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1answer
30 views

How could i calculate the voltage induced in a detector circuit by picking up RF signals from a Mobile phone?

Is there any formula/equation i could use to estimate the voltage induced at the input from the RF signals?
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1answer
66 views

What resistor type is best suited to constantly dissipate 10W?

I am trying to decide on the best resistor type for a 50V system with ~470 Ohm resistance. This resistor will constantly be dissipating power. Is a wirewound resistor the right choice? Should I be ...
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1answer
66 views

Transistor Video Amp Circuit Help

I built the below video amp & it worked nicely.But it is One in One out video amp. http://www.learningelectronics.net/circuits/video-amplifier.html Now I want One in TWO out Video distributor.I ...
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1answer
74 views

Why does my power diode have 4 terminals?

I am using a high voltage diode (APTDF400U120G) to freewheel an inductor in a switching circuit. It has four terminals, two for either side of the diode. I cannot figure out why this is. If I only ...
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2answers
42 views

do I have to separate grounds when using opto-coupler in boost converter?

I have a DC-DC boost converter: where the mosfet is driven by PWM signal generated with a PIC18F4550. However, the PWM isn't directly feed in the mosfet. It passes through an opto-coupler first. ...
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0answers
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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1answer
52 views

Strange component with marking SE-B3

I salvaged both of these parts and the one in the left has a schematic symbol that I've never seen before. I have spent hours trying to look up, but don't know what it is. The markings on it look like ...
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1answer
20 views

Understanding Undervoltage in LTC2965 - 100V Micropower Single Voltage Monitor?

The undervoltage specifications for this IC is a bit confusing to me as this is the first time I'm working with these kind of circuits. Aim : I want to monitor the voltage of a battery pack (...
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0answers
43 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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1answer
26 views

Unable to supply FONA 32u4 3.5 v through circuit

I am relatively inexperienced when it comes to circuitry and electronics. However I am trying to create a simple device in which with a press of a button, the device turns on and calls a specific ...
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0answers
39 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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0answers
29 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 ...
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2answers
170 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 ...
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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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22 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, ...
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1answer
48 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 ...
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2answers
76 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 ...
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1answer
38 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 ...
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1answer
51 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 ...
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14 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\$ \$...
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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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36 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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1answer
34 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),...
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72 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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1answer
103 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 ...
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1answer
45 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 ...
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0answers
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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2answers
90 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 ...
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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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0answers
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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2answers
110 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 ...