Questions tagged [power]

Where power is a primary concern for the design under discussion. Use the "low-power" tag when that applies.

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1answer
43 views

How to calculate maximum power when value of load resistance is unknown?

Once again same circuit and same voltage source / current source and resistances. However now I need to calculate the maximum power that is consumed by the RL. How do I do that, and most importantly ...
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21 views

Confused with a heater electrical specs

This heater's electrical specs are given as: I guess this is a pure resistive component and the power P = Vrms^2/R. This formula tells me power is a function of the voltage and the resistor. But the ...
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2answers
211 views

Adjusting Output Voltage pot from MeanWell LRS-350-36V power supply to 32V

I'm looking to buy a LRS-350-36 for my project to feed 5x50W LED at 30-34v Vf 1750mA (https://www.aliexpress.com/item/32867490711.html). This PS use a 1U form factor that I must have due space ...
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1answer
53 views

What kind of power connector is this? Attached to Adafruit 32x64 Matrix

I've been searching on Digikey and Mouser for this connector, but haven't figured it out. It's the same one that's on Adafruit's 64x32 LED matrix. It's spacing is greater than 2.54 mm, so maybe ...
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0answers
22 views

Power Converter Control Platform for Commercial Use

I'm designing a power converter for commercial use and I've been struggling to find a control platform that meets the typical industrial standards and can be used to do the control of the whole device....
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1answer
34 views

Does powering both phases (left/right rotation) of an AC motor hurt it?

I know that one can reverse the direction of an ac motor by powering the different starter windings. If you power one starter winding, you create a magnetic bias, allowing the motor to rotate to that ...
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1answer
23 views

Non - Ideal Diode and FET mode on power management ICs

Hello reading the datasheet of TPS25942 section 9.4.2, this ic lets you choose the diode mode, either act as a FET or act as a non-ideal diode. I do not know which mode to choose. what are the ...
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0answers
14 views

Communicate and charge both arduino board and android tablet

We want to connect and arduino to an android tablet via USB and charge both at the same time. We have the arduino talking to the tablet and the tablet is running a nice app to display the data from ...
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1answer
68 views

Why is it working, and can it cause damage?

I have a dab radio the requires a power source of DC 7.5V 2A However an AC adaptor that out puts 5.0V 2A is powering the radio and it functions fine Why is it working and can it cause damage ?
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24 views

SMPS fault finding

I have problems with this Philips FWP3100 mini Hi-Fi sound system because it does not produce any sound at all. I dismantled the said unit, and come across the AMP+Power Board, the said board should ...
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1answer
36 views

Converting negative voltage to positive

I am adding an ATX power supply as a bench power supply to power accessories on my model railroad layout. I prefer to run some lighting accessories at +7v, but obviously a power supply has +3.3v, +5v, ...
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1answer
26 views

When is a uC power supply “smooth enough” e.g. when some noisy (inductive, switch) load is around?

I'm building a battery/solar-powered 12V thingy that has an ESP32 microcontroller (5V generated from the 12V) and PWMs a 12V pump. The pump produces all sorts of voltage spikes on the 12V, and I'm ...
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2answers
51 views

Drawing too much power vs not supplying enough power

Why in some cases a device draws more power than the source is capable of supplying thus damaging it, and in other cases the device will work under-powered?
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1answer
40 views

DIY op-amp power supply

I purchased a DIY op-amp kit from eBay. The parts arrived in a baggy, I soldered it all together, but have no idea how to wire the power supply? I am hoping to use 9V batteries, and realize I might ...
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1answer
39 views

Powering 1920 leds with 32 strips of 60 ws2812b led strips each (32 meters)

I'm tring to build a led display with 32 strips of ws2812b led strips with 60 leds each. That's a total amount of 1920 leds. How many power supplies should I buy? Given the max current of 50mA per ...
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2answers
42 views

Two 24V switching power supply in one fused switch?

I have two Meanwell 500w 24v 21A PSU that are going to control different heaters on a 3d printer but I don't know how to connect them in a single IEC C14 fused plug switch. They need to operate ...
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1answer
41 views

About Low energy ability by 369 tesla vortex [closed]

i have seen this video in YouTube ( published. 2 years ago): https://youtu.be/BK19jELkhkY so at some part of that said about lighting almost 80 wat led power by 8 wat, and so ... I tried to search ...
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3answers
4k views

Does power delivery over ethernet always have to use isolated DC/DC converters?

I am examining the possibilities for building a cheap ethernet device that would be powered over ethernet using PoE technology. I came across this article which shows the generic block diagrams: ...
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1answer
43 views

WS2812B custom power distribution block

I have a couple questions about my DIY LED installation. Both FUSE BLOCKS have 20 amp fuses inline each input to the main terminal which leads to the PSU, so 6 to 1, each having a fuse inline such ...
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9answers
807 views

What exactly is reactive power, in concrete terms?

I've been googling it for hours and frustratingly all I could find are vague hand-waving explanations. I get that \$\textbf{S}=\textbf{VI}^\textbf{*}\$ is useful because \$Re(\textbf{S})= P_{avg}\$, ...
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1answer
21 views

The reason the advantage of Single conductor transmission line be changed to non-singular conductor transmission line

Question: If Single conductor of EHV(Extra high voltage) transmission line be changed to non-singular conductor of EHV transmission line,there are some advantages about this changing 1.Decrease the ...
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4answers
55 views

Why can we use less voltage drop to transmit the power if the higher voltage is used?

In power distribution systems, a given amount of power can be transmitted with less voltage drop if a higher voltage is used. However,i don't understand the reason about this In my thinking,if i ...
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0answers
44 views

Transmission & Distribution

During a recent job interview of mine, one of the panel asked me the following question Q) Why is the transmission voltage of overhead lines in our country in the multiples of 11? Some background ...
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0answers
32 views

USB 2.0 Maximum current through hub

I have a question regarding USB2.0 power negotiation. I'm in the process of improving the design of a support equipment PCB that utilises an FT232H chip. The layout of the current board consists of ...
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0answers
55 views

I need to convert 52 amp dc to 110 amp ac [closed]

Can 52 amp dc be converted to 110 amp ac. Is there a device on the market that can do this? If not what do I need to make a converter to do this conversion? Thanks!!
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3answers
31 views

Power Density parameter in Ultra Low Power (ULP) devices

I'm doing a bit of research on ULP processors. In a few papers (e.g. "Energy-Efficient Near-Threshold Parallel Computing: The PULPv2 Cluster") I found a figure of merit called "power density" and ...
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1answer
28 views

Generator Output at different frequencies

If a three phase generator is stated as 200kVA, 440V, 60Hz therefore a current output of 262A. If said generator is changed to deliver 50Hz power at 440V, would that reduce the power available? so the ...
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1answer
49 views

Why do solar panels need to be the same voltages when in parallel?

I have an off grid solar system which I reciently upgraded from 12v to 24v. I have two 12v solar panels which I put into series to boost the voltage to 24v (I will refer to this as a single 24v panel ...
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1answer
82 views

Flyback converter can't power load

I'm working on a Nixie tube clock and I'm having issues with the power supply. It's a flyback converter based on the LT3757 and the Coilcraft DA2032-AL flyback transformer. I designed to work with an ...
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1answer
64 views

Is power the rate of energy flowing in and out a capacitor?

I was wondering if power is the rate which energy is stored in and released by a capacitor with a sinusoidal voltage source applied? I thought this was true, but my friend said false. ):
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2answers
57 views

Electric Analogy to Hydro-Electric Power Plant

What is the right electric analogy for the system of power generation in hydro-electric power plants? I am especially curious in designing the surge tank with the symbols for electric components.
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1answer
21 views

Apc backup time calculation

I have APC BX1100C UPS for my pc. it has 2x7.2Ah battery. I have connected to it a router 12v 0.5a, and a monitor 19v 1.3a. Expected it to run 10 hours but it switched off after 2 hours. Does it mean ...
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1answer
40 views

USB-C Powering Electronics and its Circuitry

I recently designed a PCB that'll power and control a NEMA 17 stepper motors. I decided it will be powered by a 15W (5V3A) USB-C cable and wall adapter. According to my research, the 15W power is the ...
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2answers
72 views

Removed paint on power supply, what paint to use to prevent against shock [closed]

I purchased a mixing board that uses an external power supply. Apparently at some point in the PSU's life, paint remover or similar found its way onto the unit and removed a portion of the enclosure's ...
2
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2answers
41 views

Layout of Power lines to extension board (Temperature Sensor)

I'm designing an (single sided) extension board that will hold a 3-pin temperature sensor (TSIC 506). As the order of the pins go from 1 Vcc, 2 Signal, 3 GND I wonder if I should follow the same order ...
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1answer
30 views

Help with choosing transformer wire type and sizes for high frequency transformer

I have been using the following reference to design a HF transformer https://www.ti.com/lit/ml/slup126/slup126.pdf, which I have found very helpful and useful for the core loss section. However when ...
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0answers
11 views

Real Electrical Grid Operation with OPF

So I spent some time reading Power System Analysis & Design by Duncan Glover, Overbye and Sarma and I have a question concerning real power systems operation. If we run optimal power flow once ...
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0answers
23 views

Is there any difference between grounding bus bars and bus bars in general?

My intuition says no, there is no difference, other than ground bus bars are bonded to the grounding reference. As a followup, can any busbar be used as a current-carrying conductor by using ...
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1answer
50 views

How can the maximum average power transfer be negative in a power delivery circuit?

It is possible that the Thevenin resistance \$R_{Th}\$ of a circuit is negative. This occurs in non-linear circuits. Likewise, in AC circuits, the real part of \$Z_{Th}\$ can be negative. For AC ...
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1answer
57 views

Why is this device power usage so much power and with such variation?

I just got a wattage meter to try to get a sense of where my electricity usage is going. One of the surprises was my cheap drugstore humidifier, which seems to be drawing 640 watts. I have a huge ...
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45 views

Why is the true power so low when adding inductors to the circuit?

For an electronics class, we used a vacuum pump that works with inductors and measured the current in the system. This creates a phase shift, where the current lags the voltage, as is expected. We ...
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0answers
51 views

LM337 regulator not warm

I built this circuit and am getting correct voltages except the negative regulator (lm337) is cool to the touch whereas the positive regulator (lm317) is very warm. Why?
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1answer
50 views

How safe is to work on an ATX PSU as a bench power supply?

I'm trying to convert an old ATX PSU into a workbench supply. I saw there are many safety warnings about discharging the internal capacitors before opening the PSU. I'm not really concerned with it as ...
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2answers
62 views

Does peak shaving reduce the stress on power lines

I am not an eletrical engineer and have a question about demand side management in smart grids. One application is peak shaving, which means that the maxium power is reduced. Does this decrease the ...
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0answers
33 views

Power loss shutdown occurring with Pico UPS

I'm currently suffering from issues where my raspberry pi appears to lose power over time and shut down (I'm using a pico UPS to handle file safe Shutdown). From the symptoms i'm seeing it appears ...
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2answers
48 views

Current in a closed DC circuit

I am in the process of learning the fundamentals of electricity, however I am having trouble understanding why there is no measurable current in a closed DC circuit when there is no power consumption. ...
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2answers
28 views

Router resets with current absorption peaks in power supply [closed]

My ADSL router has the following feature: when a current absorption peak occurs in my home electrical system, it resets (and consequently loses the connection for some minutes). This happens in the ...
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2answers
62 views

Do I need power supply totalling my current needs to maximum of my current needs?

My prototype project has these 3 components currently: US-17HS4401 stepper motor, rated at 12V / 1.7A MIG-400 6V DC motor, 6V / 10A max (although it was spinning fast enough at 3.75A) Particle ...
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0answers
26 views

SIMCOM SIM800C Delayed Power ON

In our product, we are using SIM800C for server communication. A few of our SIM800C are not getting ON immediately after power up. But after 15-20 seconds, the network status LED starts blinking and ...
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0answers
27 views

Battery not powering up my laptop [closed]

My laptop battery is at 82%, yet cannot power up the laptop. When connected to the wall, it only blinks orange. I have tried to check on biosband reset everything to default but nothing seems to work. ...

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