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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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3answers
592 views

finding Q point of thyristor drive circuit.

how to find Q point of the transistor shown in the image. the problem is specifically due to pulse transformer.
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1answer
85 views

Superposition Theorem Question

Calculate I' in figure 8-14(a) I need help on finding I' RT= 1/4+1/4+1/2 = 1 RT= 4+2+1=7 Then i applied ohm's law to find the current IT=14/7=2mA Am i calculating anything wrong?
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2answers
7k views

What is the difference between peak-power, average power and true RMS power in RF measurement?

What difference between peak-power, average power and true RMS power in RF measurement? I have read a peak-power measurement can calculate average power measurement also. Does any of these needs ...
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2answers
2k views

Current controller circuit to drive solenoid bank

I am working on building a current controller circuit used to drive 8 solenoids (for those interested, the solenoids produce magnetic fields for use in a Zeeman Slower). My problem is that there is ...
2
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6answers
3k views

Electronic flasher with low load detection

The circuit above is an existing flasher without low load detection. I am trying to develop electronic 2-wheeler flasher with low load detection. While Googling, I got a circuit with relay in it, one ...
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1answer
273 views

How do I reverse this following circuit, i.e. when the laser is off then it should stop buzzing?

All the necessary symbols are given in the circuit itself. When the laser is shooted to photoresistor, then buzzer stops. I want to stop the buzzer as soon as laser gets off.
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8answers
74k views

Why does the USA use 110V and UK use 230-240V?

Why does the USA use 110V and UK use 230-240V? What are the advantages? Explain me with calculation. Why do they use different frequencies like 50Hz, 60Hz? What is the reason?
2
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3answers
797 views

Galvanic Isolation with Voltage Equalization?

I need to equalize the ground voltage between the input and output of an isolated DC-DC power supply while still maintaining galvanic isolation. Is there a way to do this? The reason I need this is ...
7
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1answer
585 views

What does sequences like 1-3, 1-10, 1-3-10 etc in a spectrum analyzer mean?

I have read in a paper explaining spectrum analyzer basic 'When selecting the RBW(resolution BW), there is usually a 1-10 or a 1-3-10 sequence of RBWs available. More RBWs are better because this ...
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1answer
192 views

Rigging an MRI machine with club speakers and lights

I'm using a magnetic resonance imaging (MRI) machine to fMRI trial subjects while they experience club-like conditions. This means I need loud, high-fidelity speakers, flashing multicolored lights ...
1
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0answers
168 views

How to add a desirable phase shift in the input from 3-phase ac mains?

I want to build a 12 pulse rectifier circuit. I know delta-wye or wye-delta transformers can be used to add phase shifts equal to the multiples of 30, but I don't want to use transformers. Is there ...
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1answer
153 views

Multiple voltage output power supply

I want to power a Raspberry Pi and a set of speakers from one power supply. I thought about uncasing the existing power supplies and connecting them to a power connector but that seemed a bit ...
2
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1answer
340 views

How can I prototype an Aluminum-clad board?

I have a fairly thermal-heavy design that I want to prototype on something resembling an aluminum-clad (or -core) board. Alas, it's not FR-4 and the low-volume run costs are exorbitant. What is a ...
2
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2answers
3k views

Equivalent width of CMOS gate?

When setting up the gate that is defined as OUTPUT=(AB+C)' Why is the pull up network equivalent width equal to 4? I know the pull down network is counted in series, so you just add the resistor in ...
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1answer
3k views

Difference between rising edge falling edge D flip flop (asynchronous reset)?

I am answering a question about a D Flip-Flop with Asynchronous Reset with the reset output '0', that is set to be rising edge triggered. What i don't know is the difference between a rising edge ...
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1answer
123 views

Is the circuit right?

simulate this circuit – Schematic created using CircuitLab I have found this questions and the circuit seems worong to me because the output terminal hasn't end point. If we add a more ...
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2answers
1k views

Which capacitor for a high current resonant system?

I would like to build a induction heater. simulate this circuit – Schematic created using CircuitLab V1 will be a ZVS system that is out of scope of the question. Accordint to my computations ...
3
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3answers
14k views

Average output voltage of a fully controlled full wave rectifier

What is the average voltage for a fully controlled bridge rectifier with firing angle \$\alpha\$ ? In a lot of web resources it is said to be: $$\frac{V_{max}}{\pi} (1+ cos(\alpha))$$ For example ...
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3answers
34k views

What is Overmodulation?

The Wikipedia article is very short and doesn't explain the concept very well, and there aren't any other sites that I can find that give a simple explanation. What does it mean by 100% modulation? I ...
2
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3answers
6k views

How do I drive a MOSFET working under high voltage while keeping it insulated from the rest of the circuit?

I want to drive a MOSFET with a 50Hz, 50% duty cycle clock pulse. The voltage to be switched is as high as 300V DC. The section inside the dashed lines will stay electrically isolated from the rest of ...
0
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1answer
401 views

Is it possible that LED power supply is interfering with my webcams USB connection?

Not sure it is a right place to ask this question but I'm pretty out of options. I'm building DIY home-studio LED lights out of multiple 12V LED bulbs. I'm using a dedicated power supply connected to ...
0
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1answer
709 views

Circuit working in breadboard but not perfboard

I am making a circuit to unlock my car doors. The central locking in my car works with 2 wires one at 12V, the other at 0V. When the 12V line is pulled low, the door locks. When the 0V line is pulled ...
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1answer
411 views

Is the a limit for screen resolution? [closed]

I think I am right in saying that 8k UHD is the highest a screen can go, so is there a limit to the number of pixels on a screen, limit to what the eye can recognise or what is physically possible? ...
2
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1answer
171 views

Unstable 96V DC to 3.3V Supply

So I've got a huge battery at 96VDC with a couple of electric motors hooked up to it that can draw huge amounts of current -- up to 600 amps. I need to power a few small electronics for a data ...
4
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5answers
16k 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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2answers
3k views

Power Resistor TO-263 in Layout (Eagle) [duplicate]

I am using this Power Resistor here and I am trying to put it in my layout. The Problem is I can't find any .lib (TO-263 or D2PK) file in Eagle or at least a similar package. Any Help?
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1answer
1k views

How to connect a microphone to apply audio signal to electronic circuit?

I am working on a project where we have to design a band pass filter signals in audio frequency range. We have tested the filter design using Signal generator already, and now we want to see if it ...
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1answer
143 views

Why do we use (0,+V) in digital electronics (eg processors) instead of (-V/2,+V/2)? [closed]

Would making the default voltages for 0 and 1 where relevant +|- V/2 save 1/2 power?
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2answers
201 views

How to take samples of 300V signal [duplicate]

I want to digitize (convert from analog to digital) a signal that can vary from -300 volts to +300 volts. Can anybody suggest how to handle this high voltage signal?
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1answer
3k views

Problem with PWM generator SG1525(SG3525)

I am designing a Full Bridge DC to DC convertor using SG1525(SG3525). I'm doing the simulations in OrCAD Capture(PSpice). Actually, I've successfully simulated the Power section of the converter using ...
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1answer
249 views

How is voltage gain typically achieved?

Excluding opamps and other IC's, how would one go about replicating a low voltage wave into a high voltage one?
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1answer
205 views

Why does a battery starts working on rubbing?

Whenever my TV remote or wireless keyboard/mouse stops working,I take the batteries out and rub the two terminals with some rough cloth and it works fine.I've observed that this works a lot of times(...
2
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2answers
2k views

Why my full-wave bridge type diode rectifier circuit begins an analysis from 8. second on Matlab Simulink?

Hi, I am working on Matlab Simulink's work page to get full-wave and half-wave bridge-type-diode rectifiers as could be seen in the picture. But, according to my Scope2 screen when I double clicked ...
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1answer
4k views

Determine the line phase and line to line voltage

Three single-phase transformer are connected as a transformer bank rated at 18MVA, 13.8kV(delta)/120kV(Y) // one side of the transformer bank is connected to a 120 kV transmission line and ...
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2answers
7k views

What does the line to line voltage mean? [closed]

What does the line to line voltage mean? For WYE connection is Vna line to line or Van? How about Delta connection?
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1answer
229 views

How to design a Circuit that can turn a LED ON depending on the input voltage

I have three LEDs, and I want to turn the first LED ON if the input voltage is 4V , I want to turn the first and second LED ON if the input voltage is 8V and so on. Is it possible to do without any ...
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1answer
5k views

Simulating a Flyback converter using Matlab / Simpowersystems, cannot get it to work, any tips?

I have created a flyback converter model using Simpowersystems in Simulink/Matlab. But it always gives me the wrong answer! I have simulated the same system using PLECS and Simscape/simulink and got ...
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2answers
466 views

Doubt in PMDC motor pulsed switching current

I am controlling a dc motor by switching through the MOSFET. I am able to run the DC MOTOR and I have measured the current through scope by putting a RESISTOR SERIES of the DC MOTOR. My doubt is, ...
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1answer
1k views

How to calculate switching frequecncy [duplicate]

I am trying to control a brushed DC motor with PWM control through a MOSFET, below is the basic circuit for an idea. The PWM signal is given from a microcontroller to the gate driver IC which drives ...
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1answer
2k views

Induction motor full load and no load test meaning

Why we doing the full load and no load test for induction motor What is the purpose ? and can you provide some example? Why we doing the full load test and find power and stuff and also for no ...
3
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1answer
1k views

How to limit current of an AC signal

For my project, I'm trying to work with the principle of electrovibration. This principle is about simulating textures using low current electricity on an insulated conductive surface (see Wikipedia). ...
3
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1answer
679 views

Buck Converter with resistive load

I was reading a chapter on Step down Choppers(Buck Converters). I had trouble understanding the operation of the circuit as it wasn't explained properly in the book. When I looked up on the internet , ...
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1answer
637 views

0-24V 0-47A DC-DC Converter

I have built a 12/24V 47A DC Power supply following this guide. It works well for running my battery chargers, but I'd like to make it a CCCV supply from it for my projects. What would it take to ...
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1answer
259 views

LTC2498 Temperature Sensor Chip Code via SPI

I would be very grateful for your tips for my present problem definition: I have a microcontroller ATmega128RFA1 with integrated Zigbee with UART-USB(TTL Converter) attached to the PC. From the ...
2
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1answer
629 views

Is there a rectifier scheme for tri-phase which is more efficient than the bridge rectifier?

Because of the topology of tri-phase bridge rectifier, every phase is active (i.e.; feeding the load) only for 33% of the time. It feels like we are not fully utilizing all the three phases, and ...
0
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1answer
180 views

cable losses per meter (voltage > 400 and frequencies [50 Hz … 60 Hz])

If I compute I * I * R I obtain the loss of the conductor in Watt. Is this per meter similar to the dielectric loss (see IEC 60287-1-1)? I am also wondering about the loss factor of sheath and ...
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1answer
2k views

Shorting neutral and earthing trips MCB [closed]

I live in India (220-250V, 50Hz). I have a single phase supply coming into my home. The main MCB trips as expected whenever the Live and Earth conductors get shorted. But I observed that my house's ...
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4answers
8k views

Why is flyback air gap needed for energy storage?

Why do so many sources say something along the lines "since a flyback transformer stores energy, an air gap is needed"? I have seen this reasoning in textbooks and app notes. I thought air gaps ...
3
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1answer
685 views

How to generate a short (µs) high power pulse

I'm faced with the following problem. I would like to send a current pulse of about one amp through tissue with a resistance of about 3000 ohm (so I need 3000 V obviously). The pulse should be as ...
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2answers
1k views

What happens when a AC current is applied to a PN junction? [closed]

What would happen if a AC current is applied to a PN junction? Is the input current a sine wave?