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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24 views

High Voltage Active Rectification using Silicon Carbide MOSFET

This is a purely theoretical question, please forgive me if I am being stupid. Synchronous rectification and secondary side control of DC/DC converters is very commonplace in low voltage, high ...
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37 views

Battery Power Density - Voltage Higher than Load Requires or Not?

I'm working on a project that is battery powered where run-time is an important consideration. The project has two distinct required voltage levels, both served from a single battery: 6.4V which ...
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RGBW 4 channel LED strips: Do I need externalpower supply or is the LED controller enough?

Not a beginner but still a novice :) Main goal is to find out if the LED controllers I have chosen can drive my LED strips or if I need external power supply. And to understand ofcourse :) ...
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1answer
157 views

How does the Ring doorbell get powered?

The Ring doorbell is a pretty simple and useful product. I was wondering: how does the Ring doorbell get power without activating the chime? As far as I know, a doorbell works by shorting two wires ...
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36 views

IGBT confusion with determining Ic

For this IGBT I-V curve say I have a Vge of 10V and no biasing resistor on the collector with 5 Volts being supplied by some supply providing up to x watts. According to this I-V curve this should be ...
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3answers
72 views

The relationship between power, heat and efficiency

I've been thinking about this conundrum. Given we use joules to move a metal block over a surface, we do work. So imagine a motor, that spins and pulls a string, moving said metal block over one ...
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1answer
59 views

Removing output voltage ripple in high voltage outputs

I am looking to reduce the voltage ripple on a DC/DC converter operating at 5kV. I have looked extensively on the internet and have found multiple ways to reduce output voltage ripple, an ...
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1answer
41 views

Circuit to turn microcontroller on when reed switch state changes (to monitor door lock state)

I'd like to build a circuit that provides power to a microcontroller (ESP8266 in this instance) when a reed switch is changed from closed to open AND when changed from open to closed. This is to be ...
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35 views

Help me to fix 12V 1A SMPS power supply [on hold]

I am new to electronics. I am trying to build an SMPS power supply - output 12V 1A. I got the reference design from online. The DC output from the flyback transformer is 30V+ but I am trying to ...
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2answers
108 views

What tool produces this type of layout?

I don't under this layout figure (5.c) in pic attached. This is a screenshot from research paper in this link:- https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=7573442 Alternate link for the ...
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2answers
32 views

Why is the rotor power factor of the induction motor lagging?

A 460-V 60-Hz four-pole Y-connected induction motor is rated at 25 hp. The equivalent circuit parameters are R1 = 0.15 Ω, R2 = 0.154 Ω, XM = 20 Ω, X1 = 0.852 Ω, and X2 = 1.066 Ω. The rotor power ...
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77 views

Atmel AVR cutting down the power

This might be a straight forward question: An AVR gets its power from a regulator which can be turned off with a digital low level input. However on a spike (digital high followed by digital low) the ...
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2answers
23 views

DC Fault Characteristics of a Voltage Source Converter

According to this paper, the three stages in the DC Fault characteristic of a VSC are Capacitor-Discharge State (Natural Response) Diode Freewheeling Stage (When source AC gets disconnected and \$...
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1answer
88 views

What is the purpose of these PTs?

What is the purpose of these PTs installed on the two coupled busbars? And we have whole panels in the HV room for these PTs. Kindly explain. (Photo attached)
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1answer
50 views

Can the power transfer ranges of wireless charging devices be extended to across a room?

Wireless charging devices charge devices by creating a magnetic field that induces an electric field in the device (like transformers), but its strength is inversely proportional to distance squared. ...
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39 views

Designing a rechargeable circuit for phone

I'm currently working on a project where I'm looking to design a circuit that will charge my phone by utilising a slim lithium battery that is rechargeable. I've achieved the rechargeable aspect by ...
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22 views

What circuit components should I use for a vacuum? [migrated]

So I'm constructing a dust extractor system for my workshop, and I need to figure out a circuit. I have 3D Printed a connector that connects two PVC Pipes, and has a hole for a wooden slab. I can ...
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1answer
52 views

What devices are required inorder to connect/combine various power generators together to supply clean power?

I am not an Engineer and hence will apologize in advance for the lack of technical terminology however I am attempting to figure out how to connect various power generators (for example, 1 or more ...
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1answer
44 views

Power system fault analysis

I have been stuck in this problem for identify the fault location. Can anyone show me where to start on this? I'm not familiar with reading the curves so please just give me any hint. Thank you
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1answer
61 views

Why is JSN giving error readings when powered with Buck converter 12v to 5v different power source?

When I power my esp32 with an USB cable and check the readings of JSN-SR04 it shows correct and consistent readings. But when I connect esp32 and jsn with 5v from LM2596 12V input errors are not ...
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20 views

Powering (WS2812B) LED strips through USB 3.1 GEN 1

I bought a new motherboard and it says it has USB 3.1 GEN 1 on the back panel. I did some research and apparently, USB 3.1 GEN 1 has the same power output as a USB 3.0 port which is 5V/1.8A. I thought ...
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1answer
39 views

Protecting MAX485 data or supply from shorting to 24v DC supply

I have 2000 infrared proximity sensors along 100 meters, divided to 2 meter sections with an arduino reading them sending results by MAX485. For the power, I am supplying same 24v dc from each end of ...
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1answer
38 views

Does using only 2 phases (400V) in a 3 phase transformer affect anything?

I just witnessed a 3 phase control transformer in the mcc that steps down 400V to 230V connected only with 2 phases on the 3 400V terminals, and on the other side (secondary) are your live and neutral ...
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2answers
86 views

Using a low-voltage switch in a high voltage circuit

I have an application that requires switching a circuit between the following two configurations. Circuit Lab is infuriating as it does not allow you to draw diagonal wires, so I used arrows instead. ...
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0answers
46 views

Can MIC4102 be used to drive Boost Converter

I'm trying to design a high-power Buck-Boost converter, which is meant to convert a 45-63V input voltage into a "constant" 48V. The application requires quite high currents (up to 20A continuous). The ...
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33 views

High power source and low power load (device) [duplicate]

Can we drive low power load on high power source? For example we have source power 12 volt 60 amp and load power 12 volt 5 amp. Do we need resistor between them? If needed, what value will it be and ...
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1answer
40 views

Does USB-A connector have the pins required for USB power delivery (PD)?

I have looked at various USB power delivery (PD) adapters that supply a certain number of watts and are powered by 230V mains voltage. Always, they seem to have either a USB-C port or a full USB-C ...
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2answers
54 views

Magnetic induction with varying rpm: Dealing with excess energy

I would like to get some advice regarding the following scenario: I want to build a cheap, small generator for an energy harvesting application. There are magnets on a rotating shaft and off-the-shelf ...
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3answers
60 views

Switching between battery and transformer

I want when power goes off my device don't lose power and keep working using battery power, the schematic below is what i end up with: simulate this circuit – Schematic created using CircuitLab ...
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1answer
53 views

Does USB power delivery support arbitrary voltages?

I'm looking for a USB power delivery power adapter to charge my Canon EOS RP camera via its USB-C port. Canon sells its own adapter for insane prices, and the Canon adapter is apparently nothing but a ...
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31 views

Solenoid bolt retraction power

i am looking at getting a solenoid bolt like this for a project but the problem is alot of solenoid bolts that i have ordered can be retracted by pushing the bolt in manually so for example with your ...
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3answers
65 views

Why are core losses mechanical and not electrical in an AC power flow diagram? [closed]

The power flow diagram of a generator (a) and a motor (b) are shown. But why are core losses mechanical losses?
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Second Opinion for Finding the Power of Each Element in a Linear DC Single-Loop Circuit

I have been recently trying to solve problems from a book entitled Engineering Circuit Analysis by Hayt, et al.. But I have come to a difference in answers concerning power calculations when solving ...
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1answer
27 views

Thermal resistance Junction - Maximum Power dissipation

I want to understand the real meaning of the parameter 'Thermal Resistance Junction to Air (°C/W) to calculate the power dissipation. So for example if the value of this parameter is 250°C/W, should I ...
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1answer
38 views

Voltage regulators in series

I'm trying to figure out if my power distribution setup is hurting my circuitry. Below is a picture of the setup for one device: The power supply is a wall adapter rated for 6VDC/900mA output. The ...
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24 views

What is the max current of this contactor? CDC65-24

I'm attempting to power a 50kW DC Fast Charger with 3 phase 277/480V. It needs ~55kW which is 66A per phase. I'm trying to find a contactor. This one is CDC65-24. It is a 3 pole, 100A continuous. ...
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1answer
22 views

DC current surge suppression

How can I reduce or supress the in-rush current for an inverter? I have a pair of 100 watt solar panels feeding into a solar regulator (TPS 1230) which is connected to a 12v 100 Ah lead acid battery ...
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1answer
31 views

Acceptable designing two clock generators using single package?

The circuit I usually use is Pierce oscillator: (pic source) I have always had single system clock in the system, built on single HCU04 chip. Now I need two: 6*NTSC and 4*PAL - frequencies not ...
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3answers
84 views

Voltage loss on DC circuits

I want to connect 4 bulbs in parallel. The bulbs need 12V DC and rated 18 watts. P=V*I, that means I=1.5 A on each bulb. From that the resistance of the bulbs are 8 Ohm (R=12/1.5). The circuit will ...
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1answer
20 views

I want to handle the voltage and current spikes from inductive load of 220V AC ceiling fan

I am trying to regulate speed of 220V ceiling fan from Arduino but unable to handle the reverse voltage and current though I am applying the flyback diode across inductive load.
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1answer
59 views

absolute beginner: basic question - limiting the time of power output

I am completely new to Electrical Engineering (and english is not my mother tounge) so please be gently with me :) take the following as given: power source LED ...
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1answer
34 views

How to calculate voltage-power to lower voltage-power?

I have a solar panel 18V 2W. How do I calculate how much power that is at 5V? Thank you in advance
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14 views

Power Radiated by an antenna

I have read that the power radiated by an antenna is equal to the flux of the Poynting vector through any closed surface that includes the antenna. This fact is for instance exploited to calculate ...
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5answers
169 views

Resistor & capacitor are getting too hot

I made a transformarless power supply with capacitor. When i connect it on ac, it light the leds. But after some second the 100ohm resistor and 470uf capacitor get too hot. Its too hot that i could ...
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2answers
34 views

Audio amplifier mono operation and power consumption

I'm looking to use a PAM8406 in Class-D mode, with only the left channel active. The datasheet doesn't discuss how to handle unused pins for the right channel to "deactivate" that half of the amp. ...
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1answer
93 views

What is the exact principle of this circuit? (PNP transistors and P-channel MOSFET) [duplicate]

I have this given circuit: I can see by the look of it that this is a power rail "choosing" circuit. When VBUS is applied and there is no ...
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1answer
47 views

What is internal generated voltage of synchronous motor?

A 208-V Y-connected synchronous motor is drawing 40 A at unity power factor from a 208-V power system. The field current flowing under these conditions is 2.7 A. Its synchronous reactance is 0.8 Ω. ...
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1answer
45 views

If the torque angle of the generator δ = 18°, how much power is being supplied by this generator at the current time?

The internal generated voltage EA of a 2-pole, delta-connected, 60 Hz, three-phase synchronous generator is 14.4 kV, and the terminal voltage VT is 12.8 kV. The synchronous reactance of this machine ...
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1answer
25 views

Sharing the Load: Power Ratings

I have some cheap potentiometers that I would like to use as variable resistors. The potentiometers have a power rating lower than the amount of power I would like to be able to dissipate across the ...
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1answer
69 views

How to use USB-C cable with a charger

Ill try to be as brief as possible. TL;DR: How to use my 3A 5V USB-C charger to power a dumb device that needs 5V 3A to run. My goal: I want to have a nightstand, that can charge 3 devices at the ...