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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21 views

SIZING steps and Interpreting Mosfet datasheet

After reading those Interpreting Maximum Power of a MOSFET from the datasheet How to interpret Vgs(th) min/max in a MOSFET datasheet? https://www.infineon.com/dgdl/Infineon-...
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36 views

Power MOSFET internal diode: when does it conduct?

So I'm currently studying power MOSFETs and I'm getting a bit confused about when and how it conducts current. Let's start with the normal MOSFET functioning. I'm considering a n-enhancement type ...
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63 views

3-phase inverter - component selection / calculation help

Yes, this is a component selection / calculation topic, it can be considered an "ask". Considering my current schematic and the following parameters: supply = 100~240 VAC (nominal 220VAC and 127VAC ...
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54 views

Mosfet control Rds on , and Vgs

I want to know how to calculate Vgs , assuming load current Id is constant , Vd = voltage of battery is constant , and fet is operating in thermal stability region , so there is no thermal runnawy , ...
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70 views

PI Compensator (for DC-DC Converter Control) transfer function derivation

Here is a PI compensator implemented using a OP-AMP. However, I'm wondering why Gc(s) = - vc/v, instead of vc/v. Not quite sure why there is a negative sign here since Gc(s) is defined as vc/v if I'm ...
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29 views

When do the positive sequence negative sequence, and zero sequence apprea?

I have analyzed three phases current in different cases, but I am still confused about some cases. Positive and Negative sequences are appeared but not the zero. Zero sequences is appeared, while ...
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86 views

Using active BPF to convert a square wave into a sine

I have an inverter that converts 24 V DC to a 48 VAC peak-to-peak square wave with a frequency of 55 Hz. I am then going to use a step-up transformer to output 120 VAC to power some rocket valves that ...
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216 views

Current spikes when MOSFET turns on and voltage spikes when MOSFET turns off

I studying for my Power Electronics course and have come across something which I can't seem to wrap my head around. In a lab, we built a buck converter with an inductive load and measured various ...
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64 views

Reverse Polarity in rush Protection 2 p fet parallel

after reading those links : Reverse-polarity protection P-channel MOSFET Optimal method for multiple MOSFETs for LED driving with a shared power rail Parallel MOSFETs and this pdf : ...
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175 views

Accurately measure high quality factor coils

What would be the most suitable way to measure the quality factor of high-Q coils under the following conditions? Specifications Frequency: 5 MHz to 15 MHz, the target application is wireless ...
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1answer
61 views

How the electric water heater and stove works? [closed]

I notice that some appliances have heating elements such as electric stove and water heater. I know that both of them using heating elements maybe some type of a resistor or something. I want to know ...
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51 views

DC High Current Power Supply for Electrochemical Plant

I’m looking to build my own high current full bridge rectifier to power electrowinning cells. I need a DC supply that is adjustable 0 - 5 V, and could supply up to ~50 kA (50 kiloamps.) Obviously ...
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92 views

Calculating Differential equation RLC Circuit

Hi, I tried to find the voltage on the capacitor as a function of time, Vc(t). In the initial condition (t<0) the switch was closed and the current source was open circuit, so I found the initial ...
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332 views

Why is an input side transformer necessary with a bridge rectifier?

I am not getting the statement "The load cannot be grounded without an input side transformer." Described as a disadvantage of bridge rectifiers in book on power electronics by M. H Rashid. Why can'...
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28 views

High voltage pulses amplification

Let's consider this scheme: With this scheme I wanted to get a pulse of duration 10uS with very high amplitude, starting by the same pulse with 10V amplitude. I need to get a peak of about 400V (...
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60 views

2KW - 48V - 240v / 50Hz UPS - Unknown Topology

I am refurbishing a 2kw ups that a friend gave to me. It had failed and had been left in a shipping container on a site and the PCB had suffered some low level corrosion. The PCB is a 2 layer board, ...
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261 views

How to select DC-DC converter topology?

I would really appreciate some help on this one. I am doing my bachelor's thesis/project which requires me to design and construct a DC-DC converter. I have been working on it for a couple of weeks ...
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46 views

High voltage non-inverting operational amplifier for DC signal

I am currently using LT6090 with Vcc=140 and Vee=0 for DC signal amplification with gain of 31 in non-inverting mode. For an input signal of 0-4V from a DAC the output measured is 0-124V (step change ...
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71 views

Simulating Power PMOS using LTSpice

I have a power P-channel MOSFET that can produce a max of -34 A and whose datasheet does not include parameters W or L. How can I model this PMOS without W or L if I only have \$R_{DS_{on}} \$ and \$...
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37 views

How to drive a piezo transducer

thank you for taking your time to read, im hoping someone can help me out! I am looking to drive a piezo transducer at its resonant frequency(20khz) to generate sound waves. I am doing an application ...
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52 views

Given the surface area, volume, and temperature of an IC, can you calculate how much power is dissipated?

Assume the temperature of the IC is uniform and constant and the surface area and volume are known. Can you calculate from these values the power dissipated by the IC through heat? If not, what ...
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57 views

What is the use of the diode connected anti parallel to the gate resistance in the general MOSFET/IGBT gate driver circuit?

From my limited knowledge, the only advantage of providing a parallel path through diode with a lower resistance across the main gate resistance is the high speed turn off of the power electronic ...
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37 views

Simulation of an asymetric half bridge not working

I m not able to simulate an asymetric half brige circuit :( I m new on LTspice... Here is the simulation which is really simple ... When I simulate it, I am surprised to not have 400V across the ...
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56 views

High voltage coaxial probe measurements

I am designing a high voltage motor controller and I want to validate the switching circuitry to ensure there's no excessive ringing behavior. I had an idea to use something like an SMA or u.FL ...
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79 views

Isolated MOSFET gate driver VCC and VDD power suppl

I am planning to use UCC21520 for HV SiC MOSFET based full bridge design. My operation frequency would be around 100kHz. I selected UCC21520 in order to achieve the isolation between the power and ...
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24 views

Applying DC bias on a high voltage rectified ripple 570VAC Peak down near to zero

I am working on a linear power supply with a 3phase input. I wondering if there was a possibility to shift the rectified(ripple) power signal shown below which spans between 560VAC to 505VAC ( 55VAC ...
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70 views

Rectifiers operation when there is a sudden voltage drop

Currently studying rectifiers and came along a paragraph in a book that left me puzzled. "In a full-bridge rectifier supplying an inductive load, if there is a sudden drop on the AC voltage at the ...
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86 views

What is the difference between pulse-skipping mode and burst-mode in power converters?

I have been looking at methods to regulate a resonant converter which switches from full load to zero load at rates anywhere from 100Hz to 100kHz. I am looking online at some journal/conference papers ...
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1answer
83 views

Is it a good practice to put multiple capacitors in series to obtain higher voltage rating in medium voltage system?

I am building a DC link for an IGBT based inverter. The input is provided from a 400V 3 phase AC source. I couldn't find capacitor rated greater than 450V in my nearest stores. I'm thinking of ...
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49 views

Controlling Multiple I/O Devices

How to manage multiple Input(Sensors like Temperature, Humidity, etc..) and output(like motors, relays, etc..) devices connected to a micro controller(Arduino UNO). There are more I/O devices present ...
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118 views

Electronic Circuit Breaker

I want to protect from short circuit by using a miniature circuit breaker. But this has to be manually turn ON, when ever it is turned OFF. So I was thinking to make a electronic circuit breaker which ...
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63 views

Make a Latching double pole single throw relay, using electronic components

I am latching a DPST relay. So I made a prototype using some transistors(ex. BC547) to enabling and disabling the latching. But I want to know whats the correct way of doing it. I have both 12V and ...
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1answer
95 views

PFC controller - How does it work?

I would like to better understand how a PFC controller works, especially PFC which work in CCM mode. I found the following documentation from International Rectifier: https://www.infineon.com/dgdl/an-...
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33 views

Meaning of “raised structure” in microwave networks

Can you help me to understand what "raised structure" means and why it determines the following property of the S matrix? Reference: here.
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51 views

How do I calculate the conduction angle in an uncontrolled three-phase full-wave bridge rectifier?

Basically I to calculate the conduction angle of the rectifier, with RLE load, I was taught to use some formulas and a plot but I not really how to calculate it from scratch, if you could explain it ...
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1answer
70 views

JFET circuit solving

I want to find out the value of R2, R3, R4, R5. How can I solve it? anyone can help me? For JFET1 VGS=0v, VDS = 15v. For JFET2 VGS=1v, VDS = 18v.
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135 views

Best way to drop 10volts at 0.25A with linear regulator?

What would be a minimalistic circuit design to convert 14V to 3.3V at 0.25A with a linear regulator? I'm thinking about two linear regulators. I've tried LM7805(14V-5V) to LD1117(5V-3.3V.) LM7805 ...
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2answers
80 views

How do I calculate the average voltage of this wave?

I need to calculate the average voltage of the wave below, the DC voltage is 120 V , the curve starts at 21.65 degrees and the peak voltage is 325.269 V. The solution is 221.3 V. This is from a ...
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74 views

voltage potential energy clearance?

1 coulomb = charge of 6241509074460762607.776 protons(fixed amount of energy passing thru certain point). So 1 volt = 1 joule(energy) per 1 coulomb. and 2 volts = 2 joule(energy) per 1 coulomb. does ...
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191 views

Why is the capacitor in this circuit not becoming an open circuit?

In this circuit you can find an RC circuit and 4A DC current source. I thought that if we use a DC voltage source instead of a DC current source, this circuit would become open circuit after a while. ...
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42 views

In a 3 phase inverter what is the maximum voltage across each switch

What is Vds value for switches used in the network
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25 views

Calculating power losses into IGBT formula at turn on integrating diode parameters

I have read the following application note ANIP9931E from INFINEON TECHNOLOGIES which deals with IGBT power losses : "http://www.ehu.eus/electronica-industrial/AmpliacionElectronicaIndustrial/...
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129 views

Why is 12V Common for PSU

Looking around at various PSUs and I see 12VDC show up pretty commonly, both for PSUs and motors they drive. Can anyone tell me some of the history and/or rationale behind this? E.g. is that a ...
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102 views

LTspice subcircuit with behavioral voltage source

I'd like to use behavioral voltage source in subcircuit block, as showed below: With block "comp": But when I try to simulate it doesn't work and gives mi this message: Someone could explain what's ...
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2answers
83 views

Delaying a TTL signal on the falling edge

I have a microcontroller (uC1) which outputs a TTL signal that simultaneously closes a switch on another microcontroller (uC2) AND controls a power MOSFET that cuts power to the entire system. I need ...
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1answer
77 views

Transistor heat

I am making a constant current source as an adjustable. The maximum current flowing is 1 A. I fixed the current at 570 mA, using a BDX53 BJT. BJT collector emitter voltage is 10 V. This circuit also ...
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57 views

Bidirectional level translator using N channel MOSFET

I'm using a n channel MOSFETa bidirectional level translator. The case when the body diode conducts the source end will be literally 0V or forward voltage of body diode, so the difference in voltage ...
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1answer
55 views

Series Limiting Resistor?

I have used a 3.3v and a 4.7v zener diode and please what will be the amount of resistance to operate them without any issues. The test current for 3.3v is 76mA and for 4.7v is 53mA.
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3answers
209 views

Reduce/Remove Sparks in AC and DC Contacts of Relays

I see that there are sparks being generated whenever there is a connection established between two contact points in the relays. So is there a way to reduce/remove those spark generated in the relays.
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367 views

To what extent are alternators “flexible” to variations in input speed and output voltage?

An automotive-style alternator works from 750 RPM to e.g. 7000 RPM, a range of nearly 10:1. In terms of output voltage, I know they target a fixed output voltage, but I believe it wouldn't be too ...

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