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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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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 ...
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3answers
186 views

How to power long (30 ft) nichrome wire from 120v AC wall socket

I am working on making a vacuum forming machine, and I need to power a significant length of nichrome wire off of a 120v AC wall socket. I have very little experience in electronics, but I have talked ...
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0answers
37 views

Switched Reluctance Motor

I am currently working on a project on control of Switched Reluctance Motor(SRM). So far, I have been able to run the motor using simple Arduino control by generating pulses for each phase accordingly,...
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0answers
19 views

Why does the minority carrier concentration increase exponentially towards the junctions in a forward biased power diode? (graph included)

[Image Source: Power Electronics - Converters Applications and Design by Ned Mohan] Let's take the p+ side. Since the anode is of a higher potential (forward bias), shouldn't the electrons (minority) ...
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1answer
29 views

How deep does the depletion region in power diode penetrate the lightly doped n- layer under no bias?

I could find references for describing the depletion layer in a power diode under reverse bias and the consequent classification of Non-punch through and Punch-through diodes. But I couldn't find a ...
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1answer
569 views

Why do power diodes have a p+ n- n+ construction and why not p+ p- n+?

I've been learning about power diodes and how they differ from low power diodes with the addition of a lightly doped n-type layer. This n-type layer improves the breakdown voltage rating of the ...
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1answer
35 views

Ic and Vce equations of IGBT

I know in IGBTs while operating, parameters Ic (collector current) and Vce (collector-emitter voltage) are Tj (junction temperature) and Vge (gate-emitter voltage) dependent. Is there anything else ...
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1answer
37 views

Calculation of Vce from Ic-Vge Characteristic

We have found the Ic-Vge (collector current vs gate-emitter voltage) characteristic of an IGBT device as shown below at a high Vce (collector-emitter voltage) value (here 20V) from the datasheet (...
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1answer
100 views

How can I boost 1 Volts 30 Ampere input to 5V with maximum Current limit of 5A?

How can I boost 1 Volt 30 Ampere DC input to 5V DC with a maximum Current limit of 5A?
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1answer
40 views

Reactive power compensation through grid connected inverter

I recently designed a bidirectional DC-DC charger for an Electric Vehicle (EV) battery. I would like to focus on the inverter control. In this application, I designed the inverter to have unitary ...
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2answers
518 views

Is it safe to make a dual supply out of two wall adapters?

I am trying to design a guitar distortion pedal circuit and I need +9 / -9 V dual supply in my application. I have two 9 V adapters: https://www.phihong.com/assets/pdf/PSM03A-XXX.pdf Would ...
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1answer
65 views

How to prevent a low duty cycle load from flickering lights

This is a follow up question to this: Alternatives to Large Transformer or PSU for Driving DC Heater I've hooked up 120v AC to a zero crossing SSR and a 3.2 ohm resistive load. To get my desired ...
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0answers
123 views

IGBT failure and protection

I have a 3-phase bridge rectifier (shown below). I am using an IGBT (STGE200NB60S) to limit the inrush current from the capacitors at start up. I also added the NTC thermisters to help with the inrush ...
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3answers
109 views

I am trying to build a 0-42v Voltage measuring circuit that outputs to a 5v Micro! Failing badly

I am on to my next project which doesn't seem to be working as planned. At first I thought that I would find a boatload of pages on how to do this, but to my absolute surprise I couldn't find anything ...
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1answer
45 views

What kind of PMIC is this?

I found this circuit in a schematic I'm reviewing, which supposedly provides a regulated +5 V supply. The primary side of the transformer includes a flyback controller that switches ~340 VDC on the ...
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2answers
55 views

How does flyback converter with two MOSFETs work?

This is the schematic. Both switches are in phase (On and Off at the same times). When both SW are On, current flows through primary transformer coil, entering from the top side of it, and leaving ...
0
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1answer
48 views

Can someone help me design a circuit that will open when power is applied and close after power is removed?

I am using an air conditioner thermostat transformer which provides power to my circuit. When the thermostat powers up, the door opens. I want the door to remain open until the thermostat shuts off, ...
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0answers
34 views

What are the technical challenges in developing a battery-less off-grid solar PV system (solar panel + DC-DC converter with MPPT + Inverter + Load)? [duplicate]

I am trying to develop a battery-less off-grid power system. I know the obvious reasons for not deploying such a system; no backup at night etc. Also, I understand that current MPPT charge controller ...
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2answers
33 views

Ic-Vge IGBT Curve

In the figure below, presented in the manufacturer datasheet, you can see the Ic-Vge curve of an IGBT device. As mentioned, it has been drawn at Vce=20V. What does this equality mean? Can we have such ...
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3answers
89 views

Power of audio amplifier not matching specifications

I have a Cerwin-Vega CV-2800 audio amplifier which is rated for 600 watts at 8 ohms, 900 watts at 4 ohms, and 1400 watts at 2 ohms. I also have two PWR247T-100-1R00F 1 ohm resistors rated for 100 W; ...
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1answer
29 views

Driving multiple loads with a single TRIAC and multiple optoisolators

I simulated this circuit in multisim. It is working fine. However, I am just curious to know if it is possible to drive multiple loads with multiple opto-isolators with single TRIAC? Something like ...
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2answers
179 views

Why is it bad to have an inductive load (context: dc-dc converter)?

In the book I'm studying from Power Electronics - Mohan he says: (...) has two drawbacks (1): In practice the load would be indictuve. Even with a resistive load, there would always be certain ...
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4answers
176 views

How do MPPT charge controllers curtail the power if the load is less than the solar generation?

I am trying to understand how MPPT charge controllers work when the load is less than the solar power generation. Let's assume an off-grid system with battery backup and no dump load. In my ...
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1answer
296 views

How is the extinction angle for a half wave rectifier with RL load calculated?

I have a couple of notes about the half wave rectifiers with the RL load, but I dont quite undestand how is obtained the extinction angle \$\beta\$ ? simulate this circuit – Schematic created ...
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0answers
49 views

Power calculation for given load

Peak Load Normal/Actual load Currently available 300kW 180kW 200 Amperes The system is currently running on 200A connection ...
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1answer
40 views

Series RL AC circuit Laplace analysis

Question: Find the complete expression for i(t) in a series RL circuit with source \$Vsin(\omega t)\$. simulate this circuit – Schematic created using CircuitLab So to attack this I thought to ...
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1answer
35 views

Driving an RL circuit with an audio power amplifier

I'm using a Cerwin-Vega CV-2800 audio amplifier to drive the RL circuit depicted in the diagram below: simulate this circuit – Schematic created using CircuitLab The amplifier is rated for ...
32
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3answers
5k views

Why does power dip during a lightning storm?

If lightning were to strike power lines, wouldn't you expect it to increase the power, and hence your room lights get brighter? Why do they go dim for 1 second at a time?
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6answers
340 views

Why plug is polarized in the US? What are the benefits?

I could not get a good hold of it, I searched online quite a bit. This must have to do with safety but then non-polarized switches are used through out the world with no issues are risks, so my ...
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1answer
115 views

why in case of dc neither of terminal is at zero potential? [closed]

why in case of dc neither of terminal is at zero potentialpotential while in case of ac ground is at zero potential ,let us consider negative terminal of the dc is at zero potential then why we use ...
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3answers
125 views

Should I add bypass capacitor for every IC and Microcontroller?

I am expecting a noise from a Power Source caused by motors. However my setup already includes a buck-converter, and have the input and output capacitors. Should I add bypass capacitors for the ...
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0answers
90 views

I want to make a heating element

I am going to buy a nickel-chromium wire for my heating element. I want to power it with one li-ion battery (20A 3000mAh) Intuition tells me that 84W (Draining the battery to its limit) might be ...
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1answer
42 views

relay control with network and sms with main controller [closed]

I need this project for a melting plant. There must be two relays in the control (connected to the device), so if one of them is in trouble, another will work to disconnect. In the (current check) ...
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1answer
43 views

How to safely connect multiple switching power supplies to one single cold device socket?

I apologize in advance, for only quickreading howtos, and, since I am only hobbyist, I actually don`t tinker with ac power generally. Today I can`t bypass this : I need to connect 3 switching power ...
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3answers
122 views

Calculating the ESR of Capacitor

I try to calculate the ESR of a capacitor. I checked this datasheet: http://www.farnell.com/datasheets/2245214.pdf?_ga=2.167304311.817060034.1534770853-676261198.1531404202 I can see from the ...
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1answer
45 views

How could the Gate-Source potential difference be neglected?

I’ve been reading the book Electronic Principles by Malvino In the Voltage-Divider bias section of JFET, if gate current is negligible then how did Gate Voltage attain a negative value, given Vdd ...
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1answer
64 views

Can I drive a Low-Side MOSFET from a High-Side Driver?

I'm working on a power electronics project where it involves driving 4 different MOSFETs, (3 HighSide and 1 LowSide). Rather than using a different IC for the LowSide driver, I am thinking about using ...
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0answers
75 views

MOSFETs get hots in 3 phase inverter circuit

I am trying to build a 1 kW BLDC inverter circuit. I used atmel328p processor, gate driver and 12 MOSFETs (irf3205). The MOSFETs swiches good, but when i connected to 1 kW motor at no load (with 20 V ...
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1answer
92 views

How much capacitance/joule/watt is needed on average household' energy storage system with supercapacitor?

I am on the process of making assumption how much capacitance/joule/watt is required on average supercapacitor as household' energy storage system. I plan the design for energy hub to be charged by ...
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4answers
129 views

I want to draw 20 amps from my home power outlet is there any way to do that safely?

I'm wanting connect up a bunch of Raspberry Pis (micro computers) to one power outlet in my home. At about .5 amps per computer * 40 computer means I will need to draw 20 amps. Now, I know that I'...
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1answer
1k views

Symbols: Double-arrow circle enclosed “10” on electronic appliances

What does the symbol that says 10 inside the double arrowed circle mean? I have seen a similar symbol on another appliance that had the number 25
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1answer
47 views

can SPDT relays replace SPST switch? Or does it depend on the particular implementation of the relay?

I am working on SKU consolidation and my concern right now is if I have a cheaper option of SPDT switch with all the ratings same as SPST switch which is currently used. Can I replace it? Or does it ...
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2answers
335 views

Diesel generator consumption formula

I am working on a project to monitor a power meter parameters like voltage, frequency, current and so on and this monitoring for both AC and DC. For DC we are using Cummins diesel generator, now I ...
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1answer
39 views

What load can i connect if data sheet is missing output voltage

I am looking at a DC to DC converter data sheet that has an input voltage of 0V-100V. The datasheet only mentions a max output current of 4 amps. Is it safe to assume I can place a load of any voltage ...
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0answers
40 views

Can a CM choke saturate due to the leakage inductance?

On a 3-phase common-mode choke, if the three currents sum to zero, then it will theoretically never saturate. I understand that the leakage inductance stores energy in the core. Can the three phases ...
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1answer
80 views

PCB key contact [closed]

Hi! anyone knows how to design a pcb like this in the photo with eagle? Someone has a guide to do it? I don't know how the resistor should be placed. It is basically a pcb for a synth, the key ...
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2answers
77 views

OpAmp Comparator Circuit Design for High/Low voltage measurement

I am new to this. I want to make a circuit to measure the voltage from (0 ~12 V), which can have 2 op-amps as comparator to give the output positive, when the voltage goes from 8 V to 12 V and give ...
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3answers
118 views

Circuit design with multiple voltage levels

I'm working on an art piece based around an Arduino Mega that essentially requires power for three types of devices: Solenoids (4): 24 V, ~100 mA a piece (400 mA, 9.6 W total) NeoPixel LEDs (1280): 5 ...
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2answers
479 views

Capacitor and inductor working principle

I want to know that there is opposition mechanism of current in inductor say back emf than what is opposition mechanism of voltage in capacitor ??? And also want to know that when inductor suddenly ...
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1answer
86 views

Power Supply wiring check

I'm not too confident with electronics and I'm currently working on a project where I need a 12V mains power supply. I got a switch for it and have wired it. I've shown pictures. Is this wiring ...