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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11 views

How to calculate check practically POWER of SMPS required for desktop computer

How to calculate check practically POWER of SMPS required for desktop computers I have 10 desktop pc in one PC i have a high end gaming gigabyte motherboard with AMD processor graphic card and ...
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2answers
48 views

Capacitors choice for MHz resonance circuit

I am implementing a resonance circuit (for wireless charging) in MHz frequency (\$5-10~MHz\$) , and now, I am looking for suitable capacitors. The peak voltages and current through the capacitors are ...
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5answers
139 views

Measure 25A Current In Series?

I am working on a DC battery charger project, and there is a dispute that the battery charger does not charge up to the stated 12V / 25A rating (300 watts). We've connected the DC battery charger to ...
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1answer
37 views

Understanding startup circuit in this power supply

This design is from a TI App Note: http://www.ti.com/tool/PMP10195 I want to understand the behavior of the circuit around Q3 and Q4. As far as I understand Q3 is turned on first for the VIN and and ...
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Does transformer line side voltage varies with backup generator on load side running at from 0 to 100%?

We have a transformer of 750 KVA with 5.75% impedance. On the load side we have loads and a back-up emergency generator. This emergency generator is capable of supplying the loads and still export ...
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2answers
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What is the difference between CPU transistors and generic ones?

Recently I had to build a h-bridge driver for my project, wireless power transmission. I learnt that I needed to have dead-time in my PWM signal given to IR2110, which doesn't have any dead-time ...
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1answer
26 views

Getting AC potential in PCB GND

I'm using IRM-30-12 for power supply for my PCB. This SMPS doesn't have an earthing connection pin as it has Class 2 isolation protection.There is an AC potential is generated at the circuit GND which ...
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1answer
23 views

Air circulation and condensation in custom enclosures for outdoor project

I am designing 6 custom enclosures in mild steel to be placed outdoors for 5 months in London UK. They will be interconnected, only one will contains 4 power supplies, all with conformal coating and ...
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0answers
94 views

Why the body of a gas truck is grounded? [closed]

So there is a gas station near my place that was on fire. I asked one of the workers after this incident about the cause of fire and it appeared something was not right with grounding. Does anyone ...
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0answers
19 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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2answers
33 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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59 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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51 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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1answer
54 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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0answers
28 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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1answer
64 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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1answer
69 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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53 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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2answers
84 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
57 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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1answer
50 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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2answers
75 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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2answers
319 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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27 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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0answers
35 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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2answers
231 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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1answer
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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2answers
37 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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1answer
31 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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2answers
51 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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1answer
42 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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34 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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2answers
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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2answers
48 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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0answers
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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1answer
69 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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1answer
62 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
79 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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1answer
47 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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1answer
106 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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2answers
58 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
81 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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30 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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46 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
66 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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4answers
130 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
74 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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1answer
68 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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2answers
185 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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1answer
37 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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