Tagged Questions
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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2answers
33 views
Boost /step up converter efficient and very small for high current ? (with example)
Here you have a view of the external battery of Energizer (XP18000A) of 18 000 mAh.
Energizer allows DC 19V, 3.5A in output : 19*3.5 = 67W
There are 2 batteries, so 2*3.7 = 7.4V then batteries ...
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1answer
52 views
AC power analysis
A transformer rated at a maximum of 25 kVA supplies a 12-kW load at power factor 0.60 lagging. What percent of the transformer rating does this load represent? How many kW in additional load may be ...
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2answers
130 views
+50
calculating a burden resistor for a current transformer
Background:
I follow a reference design for a single phase power meter (230V, max 3A). The below circuit is to measure current via a current transformer.
a CT will be connected to...
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0answers
16 views
Noise in Inductor Current : Buck Converter [duplicate]
Source DC: 300v DC
Output DC required : 160v DC
Load Current : 7A DC
Buck Converter Topology : IGBT as switch @ 8khz
1.1 mH Ferrite Core Inductor
Measured Inductor Current ...
0
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0answers
44 views
Designing an Automated Switching System for Solar Battery Charging Station
I am trying to design an Automated Switching System for my Solar Battery Charging Station project. In the project a 48V battery rail is charged with two 200W panels connected in series through a PWM ...
0
votes
2answers
46 views
How to theoretically determine ESR of a capacitor and DCR of an inductor for a buck converter?
How can we determine ESR of the capacitor and DCR of inductor theoretically in the design of buck converter, without using an LCR meter?
0
votes
1answer
53 views
Battery setup for LED headlamp
I am a keen fisherman and always looking for new projects to work on in my spare time.
My latest pet project is that I'm looking to increase the capacity of the batteries that power my 3W cree LED ...
0
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2answers
82 views
Can we replace the pulse transformer with some other circuit element in this circuit?
Our research group was trying to simulate and analyse this circuit. But it seems that the pulse transformer is creating the problem in the sense that we cannot find its models in Pspice, microcap or ...
2
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2answers
225 views
What is a good power electronics textbook?
I really want to learn as much as I can about power electronics, switching mode power supplies, and overall analog design. Unfortunately my universities computer engineering program is still ...
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3answers
80 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.
0
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0answers
35 views
LED bulb that works on both 64 volt DC and 110 AC
Can anyone advise on a reliable/cost-effective way to modify a screw-in LED light bulb so it will run on an AC power supply that has a battery backup where DC is provided in backup mode (this is for ...
-1
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1answer
37 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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votes
1answer
112 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 ...
1
vote
2answers
62 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 ...
0
votes
1answer
55 views
Measure the current on shunt basis
I am trying to measure high current 15A to 20A 1000V. There are two ways of doing it:
using hall sensor, that can interface directly to micro controller
using shunt resistor based.
I need ...
0
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4answers
208 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, ...
1
vote
1answer
37 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.
1
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3answers
382 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
votes
3answers
104 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
votes
1answer
178 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 ...
1
vote
1answer
82 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
vote
0answers
45 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
57 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 ...
1
vote
1answer
90 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
votes
2answers
76 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 ...
1
vote
1answer
106 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 ...
1
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1answer
105 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 ...
0
votes
2answers
79 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 ...
2
votes
2answers
240 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 ...
9
votes
3answers
1k 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 ...
1
vote
3answers
295 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 ...
0
votes
1answer
92 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 ...
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1answer
190 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 ...
0
votes
1answer
52 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
votes
1answer
123 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 ...
2
votes
3answers
1k 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 ...
1
vote
0answers
27 views
Demand Control Ventilation [closed]
I'd like to know if anyone has played with the wiring of DCV control units? Primarily those used to control HVAC's to vary the outdoor air based on the number of people. These are usually motion ...
0
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2answers
181 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
187 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 ...
0
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0answers
61 views
Is driving multiple electromagnets sequentially/with a duty cycle a practical thing to do?
I'm trying to play around with coils and I could use a bit of help:
Does duty cycling multiple DC electromagnets save on power like it would with an LED matrix, or do their inductive properties make ...
0
votes
1answer
117 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?
0
votes
2answers
93 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?
0
votes
1answer
489 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 ...
0
votes
1answer
111 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?
2
votes
1answer
124 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 ...
1
vote
0answers
122 views
Would Beetee's electrocution plan work and kill the tributes in the lake? [closed]
I would like to understand the design of an electrical system to route the electricity from lightening into a salt water lake and to thus kill anyone in the lake. In its simplest form the design is a ...
2
votes
2answers
314 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
164 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 ...
1
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2answers
266 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?
1
vote
1answer
101 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 ...
