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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AC mains rectifier issue

I built a simple full bridge rectifier with AC Mains input, but I noticed that: When the input is 220 V rms the DC output is only 293 V, but I expected the DC output voltage to be 220 x sqrt(2) = ...
6
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4answers
2k views

Indicator light circuit

I'm an electrician and my work is to maintain boats. I have a problem. On the boats are sailing lights, and for each sailing light is another light inside the boat that tells you if the sailing ...
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3answers
159 views

Current limit control using microcontroller

What I want is to open the MOSFET once the current passing through it exceeds 3A. A fuse is already being used, but more protection is needed. There are some options to do it. I could measure the ...
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1answer
41 views

Voltage of ESC of ebike to motor

I have 3 cables (blue,green,yellow) from my ESC to my motor. However I’m confused whether the voltage it provides is AC or DC. Does the nature of the voltage have anything to do with the kind of motor ...
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1answer
60 views

Fast 5V DC power monitoring

I am designing a camera that is powered by a 5 V DC power line. I need to evaluate the peak power consumption of the device during image capture. At a pixel clock period of 40 microseconds I expect ...
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2answers
37 views

Can I connect a 15A surge protector to a 13A extension cord?

As someone who’s studied engineering, I should be able to answer this question. However, a quick search online has me confused. Provided what I’m plugging in (a laptop drawing relatively little power)...
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2answers
88 views

What does this symbol on a contactor represent?

What does this symbol represent? It is connected to a contactor.
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2answers
80 views

Problem in IR2112 use

What is wrong in this connection diagram. I had provided pwm with 20kHz and 5volts. But at the R3 I am not getting results
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1answer
210 views

Fuse symbol on toroidal transformer

I was searching today for a new 24V transformer, and I found that some of them have a "fuse" symbol on their label, and I was wondering what this fuse symbol means? Does the fuse symbol on a ...
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1answer
55 views

Buck converter design issue

I want to design buck converter for 385VDC to 48VDC for that I calculated the values of component and simulated it with proteus but I am not getting the desired output. What is wrong? PWM has a 20v ...
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0answers
46 views

Equivalent Circuit of Howland current Pump

Why is at norton circuit for Howland current pump the current source is taken as vi/R1 instead of vi/R0? Because the formula for Norton current is IL=In*(Rn/(Rl+Rn))
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1answer
104 views

explain the working of this circuit [closed]

I'm basically trying to understand how this Dc to Dc step-up converter work. please help me.[![dc-dc step-up voltage converter 1v-9v][2]][2] I need to design a DC DC step up converter using bjts. ...
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1answer
146 views

[UPDATED, not solved]Simulating a Buck converter

Im trying to simulate a buck converter done in class to see if this fits what the theory says it would be, It must receive 110 V and send to the load around 60V and 20 A, the circuit is: And with ...
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1answer
78 views

How is this equation valid? [closed]

I am trying to understand the Howland circuit.But how is the following equation formed .Isnt it should be(vi-vo)/R
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0answers
37 views

driver for IRF840

I want to use MOSFET IRF840 for DC-DC converter application. I am providing PWM signal from PIC microcontroller. I have tried to simulate using IR2110 but it is not working. What type of gate driver I ...
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0answers
31 views

How to read Torque-Power diagram for an asynchronous motor

I'm sorry if my question is too stupid, but I am not able to correctly understand how to compare the information showed by the torque-power diagram with the motor test data for a 2000W Asynchronous ...
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0answers
18 views

LiIon battery discharging

I have a question regarding LiIon battery discharging. Lets say I have a battery which is connected to a dc bus via a battery charger which has a bypass contactor in parallel. The charger is ...
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1answer
37 views

3 Phase PMSM Motor Current Measurement: Figuring out the 2 negative terminal currents with 1 positive current measurement

I am trying to implement F.O.C for a PMSM machine with a custom made inverter board. The H-bridges are from Infineon (IFX007T) and they provide current sensing capabilities. The problem is, i need the ...
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3answers
48 views

MW of installed capacity

I am conducting research on wind turbines, specifically into how many hectares wind farms use. I have come across the phase 'installed capacity'. If wind farms typically use up 10 hectares per ...
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0answers
42 views

Find force pull solenoid

Sorry for the previous post that was wrong. I want to knowF=(NI)^2*μ0*A/2L^2 A What is the cross-sectional area? NewRef.https://www.researchgate.net/publication/...
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1answer
58 views

Solar Panel Not Powering Toy DC Motor

I made a 15v solar panel from garden lights which supplies 50mA of current in direct sunlight. For some reason it doesn't power a simple dc motor which can run on a 1.5v battery. Why isn't it powering ...
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1answer
67 views

Variable Constant Current Supply

I've been looking around for a good CCS schematic, and decided to try making a simpler one even if it means it'll behave worse. I need a 12V (would come from an ATX power supply, more than enough ...
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1answer
95 views

What voltage rating does the resistor in this circuit need to be? [closed]

In this circuit: the load is protected from transient voltage spikes by the MOV, which clamps at 1kV. If the circuit experiences a 6kV spike on the mains supply, will the resistor get hit with 6kV, ...
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0answers
30 views

Using variable resistor to nullify Cap Bank Droop

In a high power application I am charging a cap bank to 800V and letting it discharge into a load of about 2 ohms for 2 seconds. To avoid droop I could overcharge the capacitors and use a buck ...
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1answer
146 views

Zener diode parallel to RC circuit

In the left hand side part there is a diode in series to parallel RC network. And in the right hand side there is a zener diode in parallel with series RC network. How do these sub circuits operate? ...
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2answers
92 views

Fixing conmutation for high voltage switching with power MOSFET

I have an issue with a charge circuit for a capacitor as load. I want to switch approximately 400 V DC to charge a 1000 µF 600 V capacitor. I'm using a power MOSFET for this application. I need it to ...
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1answer
42 views

How does work the trigger/start of this buck converter?

Im watching this video but since its in german I dont fully understand the way it works, specially the startup side with the pulse source and the mosfet. Could someone explain me this part of the ...
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0answers
21 views

Under what conditions does a VSC require a DC-link capacitor?

For basic, conventional converters, such as the three-phase two- and three-level converters, the use of a DC-link capacitor makes sense to me. Considering only reactive power applications, it makes ...
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0answers
44 views

How does a electropermanent magnet work?

I’m trying to wrap my head around electropermanent magnetism. I read this wonderful PhD Thesis by Ara Knaian as well as details the history of this concept as well as Kyle Gilpin, Ara Knaian, and ...
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2answers
150 views

Raspberry Pi not Compatible with Mosfet?

This is my mosfet datasheet RFP30N06LE i have my schematic setup exactly like this (except powering a 12v load not 60v) and even confirming with a multimeter when i set my gpio pin to high that there ...
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2answers
109 views

Am I safe working with a power supplier of 12 DC connected to the AC wall socket main line?

I'm working on an electronic home experimental project. But I have always been afraid of the issue of electricity since it can electrocute. My question is.. Am I safe working with a power supplier ...
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0answers
20 views

Boost converter load regulation

I am currently building a boost converter with PID control to control the output based on the discharge. The output will be fed into a DC/AC converter which, ideally, will power different loads. As of ...
12
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6answers
4k views

What kind of hardware implements Fourier transform?

I looked around online but I found nothing relevant. It is very difficult for an electronic device to decompose a signal in different frequencies. How this is done at the bare metal level? Any ...
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0answers
50 views

Cant recognise a Damaged component of switched-mode power supply

I was repairing an smps ATX power supply I found a damaged component that I could not it recognise. I thought it's a power switch since it was mounted to a heat sink along with tow D13007 NPN power ...
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0answers
56 views

Alternate uses for Gate Driver - Driving a Load without External IGBT or FET

What issues would one encounter by using a gate driver IC to directly drive a load instead of using it to drive transistors? For consideration would be the very affordable Infineon 2EDN752x series ...
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2answers
717 views

IGBT transistor with auxiliary emitter

Recently I discovered, that some IGBT transistors in IGBT modules have the second pin for an emitter, called auxiliary emitter. In the picture above 2nd and 4th pins are auxiliary emitters. This is ...
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1answer
124 views

DC-DC Buck Converter Issue

I made the below discrete two transistor buck converter. When NO load the output shows 5V nicely. Even a small 100mA load, the output voltage drops down. How to overcome the issue? Actually I need ...
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1answer
105 views

Synchronous vs asynchronous PWM modulation

According to Mohan/Power Electronics, asynchronous PWM modulation results in subharmonics that are very undesirable in most applications. We can use this type of modulation only if we choose a large ...
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1answer
18 views

How Simulink determines the amplitute of the carrier in PWM generator

In Matlab/Simulink, we can use the PWM generator block in order to create pulses. So, according to this method, the carrier is compared to the reference signal in order to create the pulses. In ...
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2answers
72 views

Automotive alternator

I have been working on a project where so called Lundell alternator plays a crucial role. I haven't got any experience with this device sofar so I have decided to study some literature regarding this ...
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4answers
236 views

Could someone explain dither signal?

I know that regarding proportional valves the dither signal is a signal superimposed on PWM command that actually moves the valve. It improves the response of the valve because the coefficient of ...
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1answer
230 views

Buck converter MOSFET getting hot

I am building a solar charge controller. I have based the design on pwm5 by Julian illet (circuit diagram attached). I am trying to convert this PWM charge controller in to a mppt one. The buck ...
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3answers
94 views

Inductance value of an Isolation Transformer

There is a small isolation transformer 'L1' of 1:1 ratio as shown in the image. A 0-24V, 75kHz square wave is applied from push-pull mosfets stage at the 'V_SW' input of the circuit. I want to find ...
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1answer
52 views

TO-247 High Voltage pin clearance

I am using IXYH16N170CV1 IGBT's mounted at the edge of a PCB. The legs will be long and bent back to reach the heatsink shown in the image. This device is rated for 1700 V and 16 A. My nominal ...
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0answers
37 views

What is the 'right' way for a 3-Phase Watt Meter to determine import-export Watt-hours?

What is the correct way for a 3 Phase Watt-Hour meter to measure total import/export watt-hours? I ask because I have seen this done in 2 different ways both in 'approved' meters: Assume that: Red ...
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0answers
47 views

Does potentiometer accuracy change with degree of movement?

I want to use a conductive plastic potentiometer for my actuator application where movement is +/- 40 degrees. As in datasheet, the potentiometer linearity is given as +/-0.2 % which I think is for ...
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1answer
71 views

220v to 5v AC to DC Rectifier IC [closed]

I am working on a small project where I need to convert 220v AC to 5v DC with at least 100mA current. I am currently using Hi-Link's converter to achieve the goal and it's working great. I am looking ...
4
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1answer
361 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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2answers
85 views

High voltage drop when load is connected [closed]

I'm getting 6 volts open circuit voltage. Whenever I connect a load (resistors), there is a huge drop in voltage values. Does it signify power input is less or is there any other reason for the same? ...
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0answers
58 views

Circuit for Neutral point of 3-Phase mains

I wonder if the 'Neutral Point' as mentioned in the attached image is correctly labeled or not? Is there any mistake in this 3-phase circuit design? Edit 1: Also it looks like the 'Neutral point' is ...