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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Arduino 230v Light bulb dimming

Hey guys i have done a lot of research and testing on different circuits for 230v(50hz) or 220v light dimming, but i cant get my arduino to dim my light. This is the last thing i tried. made this ...
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541 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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581 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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Does the IR2110 need a gate resistor?

The datasheet of the IR2110 shows this as the typical connection: And in some cases even a gate-source resistor is used, as in this and this post But the app note shows this as the connection for a ...
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Generating electricity by moving a door

I'm entirely new to electrical engineering. This is for a hardware/software project I have in mind, where I need electricity without having to plug the device into a power source. My intention is to ...
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1answer
8k views

Switching frequency of a solid state relay?

I bought a SainSmart 4 channel solid state relay recently. I am planning to use an Arduino to control some Christmas lights I've put up around my home. My question is: How fast can you switch SSR's on ...
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1answer
30k views

Q-Point of a circuit

In a BJT or MOSFET circuit we have this curve: What is that q-point? From my research I have the following information: The operating point of a device, also known as bias point or quiescent point ...
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266 views

Why are there no power JFETs?

After doing a search on mouser, I found only 4 JFETs rated for more than 1A drain-source current, compared to almost 3,000 BJT and 11,000 MOSFETs. Is this because there is less of a market for a high ...
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1answer
373 views

“Correct” way to attach cable to this specific kind of banana plug

I bought a set of banana plugs of the style shown here (with rough 3d model to clarify the shape of the terminal because shiny metal is hard to photograph!). The site I got them from (here) didn't go ...
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3answers
852 views

TVS for 48v system

I have a 48v battery powered system is charged by normal lead acid charger that might reach up to 14.5v and maybe 15v per battery ( total 58v to 60v ). The circuit contains components rated for 75v ...
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166 views

Removing output voltage ripple in high voltage outputs

I am looking to reduce the voltage ripple on a DC/DC converter operating at 5kV. I have looked extensively on the internet and have found multiple ways to reduce output voltage ripple, an ...
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2answers
2k views

Induction heater circuit problem

I am trying to build induction heater with the help of the following schematics(taken from this page): So I am using 220:10Vrms(15Vpeak) transformer with fullbridge rectifier and a capacitor to get ...
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112 views

Power electronics DC DC converter question: What is the function of the capacitor and resistor connected between two series inductors?

This is a power electronics DC DC converter question: What is the function of the capacitor and resistor connected between two series inductors? This is part of the schematic from a photovoltaic ...
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1answer
429 views

Thyristor/SCR \$i^2t\$ and \$i^2\sqrt{t}\$ Rating

I have commonly seen the \$i^2t\$ rating for fusing in a SCR datasheet. This is a helpful rating for assessing if pulses which exceed the surge current rating (Itsm) of the SCR will damage it. ...
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why neutral does not shock. how can a neutral be neutral in ac current? [duplicate]

When I probe my city mains with one probe in the live and one in earth (which should be 0 volt) it shows a voltage of around 250v. But when I probe the neutral and the earth it shows no voltage. I ...
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552 views

1117 Regulator input voltage

First, a little background - I'm working on replacing an old (late 1970's) output driver board. The old equipment this came off of has a very dirty and poorly-regulated 5V system. Since I'm using ...
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Is it a good idea to connect the Neutral point to your common ground in your PCB?

I am making a PCB that uses AC Mains power where 120VAC is converted to 5VDC with the help of AC/DC converter. The 5V output is then supplied to my digital circuitry. The main confusion I have is to ...
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18k views

What to plug in first to usb charger when charging: wall outlet or cell phone and why? [closed]

I asked this question on Physics StackExchange but was advised to ask it here. When I charge me cell phone or notebook or whatever device what should I plug in first? Should I at first plug in usb ...
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616 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
4k views

BLDC PWM frequency

I am driving a BLDC motor using a 6-step commutation table at a 40kHz PWM frequency and I am at a loss choosing the optimal one. I understand that the max frequency depends on the motor's R/L ratio ...
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3answers
525 views

Current Measurement. 50Amps 0.5% error margin

I am working on a solar energy project and I'm using a 10 panel array. For monitoring purposes I'm using a combiner device which tracks various data parameters like current, voltage and temperature. ...
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1answer
382 views

Feedback in LM2574

I wonder what is the purpose of 'R66' at the feedback terminal of LM2574? I have seen its datasheet but I cannot find info about this. Instead of a single resistor there is a voltage divider shown in ...
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4k views

How to control power to a water heater

My water heater element is rated at 3.6kW at 240V. To use solar power efficiently, I would like to use excess solar power (in a grid-tied arrangement) to heat our domestic hot water. Our electricity ...
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2answers
132 views

Mosfet gate driver have no direct connection to ground

This picture shows some part of a high frequency (about 250kHz) MOSFET gate driver circuit.I searched for various types of gate drivers in google and didn't encounter anything like this. Can someone ...
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Does output voltage of a boost converter depend on load current in CCM?

In the thread below, there are different opinions whether output voltage of a boost converter operating in continuous conduction mode (CCM) depends on load current or not. Boost Converter Output ...
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275 views

Dissipating Heat from Tiny Components

I need a 5v 2.5A output in a handheld device and have settled on the TPS61235P. Its 2.5mm QFN package was very hard to solder, but I finally got a board fabbed and tested it out. After roughly a few ...
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576 views

Speeding up turn-on and off with VOM1271 Photovoltaic MOSFET Driver (/optocoupler)

It's my first post here so please do not hesitate to tell me if I'm not doing it right :-) A bit of context : we need to switch an array of power resistors (1,3kW, 1ohms) in order to test under load ...
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1answer
263 views

What is the current component at the input of dc-dc converters?

The table below describles state space analysis in the field of power electronics. It is from a paper entitled "Signal Flow Graph in Loop Gain Analysis of DC–DC PWM CCM Switching Converters by Wing-...
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1answer
317 views

High Voltage Power Supply Design

I need to charge a 1000uF 400V capacitor bank off of a 7V LiPo battery within roughly 5 seconds, and have the circuit be as small and light weight as possible. With a constant voltage supply and a ...
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Voltage divider Biasing of transistor

In this amplifier circuit we are using a voltage divider bias. Why can we consider that voltage produced by R2 is actually providing voltage to the base. What is R1 doing?
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748 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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745 views

Is it safe to use narrow but short PCB traces for high current flow?

I am trying to design a PCB which has high current traces on it. PCB has 1 oz (35 um) trace thickness. Maximum current flow is going to be 12 Amps RMS. I found this online PCB thickness calculator: ...
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9k views

Using the TP4056 to charge a LiPo battery and supply power to my circuit

My goal is to power a 5V circuit using a rechargeable battery with an optional USB power source. I have a TP4056 battery charger (with battery protection circuit) to charge my 3.7V 900mAh LiPo battery ...
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2answers
261 views

Supercapacitor with a rated voltage value greater than 2.7V feasible?

I've been researching into the development of electrical power units for Automotives (motorsports in particular, as I participate in my Uni's Formula Student team) and have started by looking into the ...
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520 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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1answer
1k views

Induction cooker - highly irregular power transfer curve

I’ve designed a Class D series resonant inverter, for use in an induction cooking application, which is displaying a strange behavior in its measured current vs frequency curve. The topology, ...
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Why do we use a diac for triggering a triac?

I mean, Wouldn't it be possible to give a gate pulse on triac directly? I have seen in many phase control application circuits like fan speed control,the usage of diacs to trigger a triac.
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Current sensor measuring circuit

I am planning to design Rshunt basis current measuring. My current measuring range is 1A~2A. I need analog output of 0~5V analog with 1% accuracy. How can I do this? I found conversion circuit here. ...
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1answer
119 views

Want Square Waves based on Injection Timing of 4-Stroke Engine

Recently, I am working on ECU of CNG Auto Rickshaw having 4 Stroke Engine. Here, Image shows the Engine of Auto Rickshaw. I have already taken reading of MAP, TPS and RPM. And now I am working on ...
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335 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 ...
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1k 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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485 views

High Step-up Ratio DC-DC Convert (12V-to-150V) - Boost, Flyback, Coupled-inductor Boost?

I am trying to design an on board DC DC converter that generates 150V from a 12V input. I'd like to design it to handle at least a 30-50mA load, but in reality the load will most likely be smaller. ...
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2k views

Unknown electrical component in circuit

I was checking out a circuit for power management. That's when I came across this unknown component which looks so much like half a transformer and a switch. What exactly is this?
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Why do we want higher power factor in ac motors?

Here is a simplified 3P electric motor below: This motor is simply combined of three coils facing toward to the rotator (in the center) 120 degree apart to each other. The user wants his rotator to ...
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4answers
278 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 ...
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3answers
4k views

In a car, what is the difference between a 12-V and a 24-V system?

As I understood, 12-V car system refers to automotive system that runs with a 12-V battery. What are the basic differences between a 12-V and a 24-V (actuators, ECU...) ?
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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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402 views

Why is gallium nitride used in power electronics? Are there any alternatives available?

I'm preparing for a seminar related to variable gain amplifier. I read that GaN/AlGaN are used. I wish to know why they specifically use them.
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1answer
557 views

Symmetric vs Asymmetric PWM

I am working on Control of Power Converters, I was reading TI's piccolo DSP ePWM guide and came across symmetric vs asymmetric PWM, I have a good basic understanding about converters, DSP and all. ...
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982 views

Spark when connecting battery module to DC power supply

I am using a 60v DC power supply to charge a 48v battery module. I set current and voltage limits first, turn off the DC power supply, connect positive to battery's positive side. When I try to ...