Questions tagged [power-electronics]
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Control techniques for linearized systems (I.E. a linearized DC-DC boost converter)
I have a linearized model of a DC-DC boost converter, in matrix form:
$x' = Ax + bu + d$
(the two "x" states are the input inductor current, and the output capacitor voltage)
For controlling ...
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How does the ignition angle determine if a B2C works as a rectifier or inverter?
So I in my text it says that when I have an ignition angle between 0° and 90° my power converter (B2C) works as a rectifier generating a positive output voltage. If I have an ignition angle over 90° ...
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What would be the best capacitor to use for a railgun that uses a capacitor as the projectile?
I have had a long-time interest and fascination with railgun technology and for a long time I have wanted to build a small-scale, simple railgun as a scientific experiment. This railgun is designed to ...
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Faulty capacitor identification
I was testing my SVPWM power board with a light bulb load instead of the AC servo motor. It worked a few times while testing. The bulb would turn on and my PWM was verified.
The last time I turned it ...
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Can wireless charging become more energy efficient?
I've stumbled upon a few articles saying that wireless charging takes more energy to charge something compared to the cable. Like this one.
Like in the test from the article, it takes 47.33 % more ...
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Why does 4-wire resistance measurement change after a period of time?
I have a plug that I am measuring the resistance using the kelvin probe.
The plug is as below. The measurement is taken from the contact point of the plug the other end that has a PCB inside that ...
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Question about time system of first order system
can anyone plz explain this next step? how this has been done
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Why do kWh (smart) meters have a maximum operating altitude?
At first I thought it was a bad translation from Chinese to English, but it turns out that many data-sheets of kWh power meters mention a maximum altitude, usually below 2 or 3 km.
For example:
...
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Strange problem with Impedance?
I've encountered a strange problem with a 12V key-fob device. We use a device to remote control a relay via a key-fob transmitter. It's installed in a plastic box that is mounted at an operator ...
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How can I calculate power dissipating through a Eaton moulded circuit breaker?
Excuse my English. I am trying to figure out how to calculate the power dissipating through a CB by Eaton. Not much info is given on resistance.
Assuming I selected a 250 CB, how can I calculate the ...
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Classifying and managing the risk of dust inside industrial uninterruptible power supplies
I manage a fleet of large UPSes in industrial plants across the UK.
Over the past couple of years, I have had a few blow up. The manufacturer, who also maintain the UPSes once a year, claim that the ...
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Frequency inverters and interference
Frequency inverters produce high frequency spikes on the side of the power input. This is relevant when designing an emergency power supply for a site with lots of VFD, apparantly it is advised to ...
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What motors would work best for a 360 degree rotational platform?
I'm trying to build a 6 DOF 360 degree platform and I need 3 powerful motors to rotate 3 arms that hold the center platform. The Pitch arm is the first arm, which will be doing most of the heavy ...
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Proposing a Transfer Function from a Response Graph
I need to propose a transfer function from the following graph. The K value (or amplifier gain?) we were given is 2 and it has a step response of 2 as well. When looking at the graph though it looks ...
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Does wiring heat elements in parallel vs series at the same power affects the results?
I am designing an electric kiln just for fun and I found myself not knowing how to answer this scenarios.
The main constant is power. The final power must be the same in each case. My question is ...
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Peculiar step-down transformer behavior
I have wired several loaded transformers and when calculating power on H vs X side by multiplying current times voltage the wattage is not even close to equal with the H side having 2 to 3 times more ...
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what is the problem with j1000 drive?
I have problem in the drive-J1000, not running , shows F 9.50 on display , just twinkling here is a video
https://drive.google.com/file/d/1JasqdFWffqOWf1wKko-XR6xYs1OKAzdu/view?usp=sharing
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Why do inorganic LEDs wear out?
Why do inorganic LED bulbs have a limited lifespan? For example, a manufacturer may quote that a bulb or monitor powered by an organic light emitting diode(s) has a lifespan of 50,000 hours, while it ...
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How Is a Gap Maintained Between the Stators and Rotors in Axial Flux Motors?
From my limited knowledge, the closer two magnets are together, the stronger the attraction and repulsion force. I'd assume that would mean a motor designer would want the stator and rotors as close ...
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How does a Charging Station stop a charge with an EV connected
I'm trying to control a charging station with a raspberry pi. The software is almost finished by there is something missing in the electrical architecture of my CS. The EV is connected to the CS with ...
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How to build and power very large scale addressable LEDs?
A 2 part question. I've built large scale LED projects in the past, but for the next one it would be massive (a black hole disc with a diameter of 54 ft), and addressable LEDs on the top and bottom. ...
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What should be the clearance and creepage for the line to line 440 Vac and line to neutral 240 Vac of the three-phase system on PCB?
Also is there any link to calculate this as per the UL and other industrial standards
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How to find pixel density in LED Display Board?
How to find pixel density in LED Display Board?
How do we compare pixel per inch and dots per inch?
In this example, a screen of 16'x9' is shown. How did they calculate 4875x2710P and 975x548p and so ...
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Heat transfer: does the heat generated in a cable get transferred to the electrical components?
I have a 1000 V, 50 sq mm, double insulated (XLPE) copper conductor cable. This cable is being connected to a power electronic component.
The current flowing through it is 230 Amps DC. The cable ...
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Why do identical-looking power plugs randomly not fit in some sockets in the same power strip?
This has bothered me for many years, but I'm only now coming around to ask about it.
I don't know if this is unique to Sweden or something, but for whatever reason, when I try to plug things into the ...
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Why am I getting such conflicting safety advice regarding opening up and dedusting/servicing my CRT TV?
I have asked questions on Stack Exchange. I have watched many videos on YouTube. I have asked professional TV repairmen. I get wildly different advice on the safety of opening my 1989 28" CRT TV.
...
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What are some methods of converting electricity without the use of induction or heat?
I was trying to study exactly how current in a wire is used to do so much in our life and how the energy is converted. But the only methods I have found are by using the resistance of the conductor to ...
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Would the below thermal generator work properly and provide surplus energy?
Since thermoelectric generators make electricity through thermal flux, could a device that mixes NaOH and HCl on one side (heat) and Ba(OH)2•8H2O and NH4SCN (cold) be efficient? Could it produce more ...
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What is this component on the face of an analog clock?
I have this decade old wall clock in my house and it has this little component peeping out its dial. I was curious as to what this component is and what it does in a clock.
I was into Arduino for a ...
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Backing up a welder's power source with lead acid batteries
I'm thinking of purchasing a MIG welder sometime in the future. Given, the ordinary mains cannot supply the power. So I would have to plug it through the dryer's outlet, with some adapter & ...
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Flood light pole components
I saw this flood light pole. It has two LED bulbs, but I do not know what the box in the middle is (it was not an LED), could you guys help me understand what this could be? This flood light is ...
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Load/power shedding for DIY power generation - how does it work?
I am putting together a simple DIY solar generation unit for an off grid cabin.
The cabin will "pull" (i.e. present) a variable load to the generator over a given time period.
Suppose I have ...
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MOSFET pass short spike during power up
I discovered one feature. I've designed circuit for pulse generation and I discovered that it always pass one spike during power up. The circuit is consist of two sections. PMOS for Enable and PMOS ...
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Can I use a PWM motor regulator to control a LED string?
I recently bought some LED Christmas lights, but they are too bright. So I was thinking that maybe I could regulate the output by using a PWM regulator? My LED lights have an output of 30V from the ...
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What to do with the high dv/dt on bridge H?
I have an H bridge, with a 540V DC link. There is a high level of noise induction across the board (even though all circuits and sources are isolated). Bridge H has drives that provide dual power (+...
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How to know which opto-coupler is suitable for high current application?
I would like a suitable opto-coupler to use as isolation from a 12V and around 30A current and another for 5V and around 30A. Are there any good opto-couplers for those ratings?
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Voltage drop on amplifier signal after LED switches on
Circuit above shows my design for amplifying PIR sensor signal, which I then feed to Arduino and based off this signal I switch a LED on.
Both, the LED and PIR sensor, are on the same voltage rail (9V)...
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How to Supply two different DC voltages using High Current
I'm trying to function a 12V stepper motor(>2.5A) and five 6V servos(>3A). Are there any reliable circuits that can output both these voltages and a high output current since there will be some ...
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DIY BLDC ESC problem is causing MOSFETS and motor to get very hot very fast, HELP
Hey everyone this is my first time reaching out to the community for help to see if someone can show me what I'm not seeing on this. Basically I am trying to make my own ESC for a BLDC and before ...
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AC/DC Laptop adapter power losses
I have a laptop power adapter shown in the picture below.
It is written there
170Watt
INPUT: 100-240V ~ 2.5A
OUTPUT: 20V 8.5A
I believe for AC Input they mean Root mean square voltage/current.
for ...
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Why design chargers with USB port on a side rather than top [closed]
Edit 3: the question being closed due to being opinion based? The design causes problems that are not in the other design, there are no benefits provided for the restrictions that the design imposes, ...
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Modeling a simple capacitor
Hey guys I am trying to model the performance of a hypothetical capacitor.
Capacitance depends on its geometry, but the charging and discharging of the capacitor depend on a resistive load within the ...
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Can a semi-conductor cooler be powerful enough for a room? [duplicate]
I see semiconductors used for small fridges. I cannot find one large enough to cool a room (in place of a conventional Freon based, window air-conditioner). What engineering problems might a up scaled ...
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Does electricity go through non-metal materials or not?
Ever since I was a little boy, I've always had this idea that electricity can only go through metal materials. For example, if I put a 100% metal screwdriver into the socket in the wall, I'm going to ...
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Why doesn't the European Type F plugs use a regular earth pin?
Plugs and sockets tend to differ between countries. Though many different standards exist the vast majority have one thing in common: The pins (earth included) are attached to the plug.
However this ...
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Line to line voltage
I have a question regarding power electronics. What is the meaning of 'line to line voltage' what does it tell us and how can this be calculated. Say I have a three phase system how would one find the ...
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How to match a circuit relay online
I don't know where to turn to get an answer to this and I hope this is not the wrong setting to ask for this.
I am looking for this Song Chuan relay ( and I prefer not to order it clear from China. ...
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Power Electronics Project
Can I use 220-12v,1.5 Amps Stepdown transformer along with 12V 2A (KBP200) bridge rectifier to build a charger for 12v, 7.5AH battery or I should use transformer with Higher output, maybe 15V
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Why using Tyristor (SCR) for inverting the DC voltage in HVDC systems?
In High Voltage 3 PHASE Transmission Systems the voltage needs to be rectified (from the AC generation source to DC), transmitted, and then inverted back (From DC to AC). For doing this, usually LCC (...
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Can a level shifter convert power from 3.3v to 5v and then back to 3.3v?
I need a digital output from a raspberry to power a stepper driver that takes 5v as input.
After that, the output from the stepper driver must be converted back to 3.3V because a Pi can't handle 5v on ...
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