Questions tagged [phase]

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Constructive Interference of two AC waveforms [closed]

Is this correct? We have two AC waveforms of the same phase. 4000V 0.03 amps -> 120W 12V 60 amps -> 720W Total Watts 840W If these two waves undergo constructive interference: 4012 * 60.03 -&...
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-1 votes
1 answer
83 views

Why this motor shows delta 220 / star 380 which is usually the other way round from what I know? [closed]

Brand new induction motor arrived in the factory,it comes with gearbox on top controlled by VFD, but I could not understand it's nameplate, it should have shown just delta / star without voltage ...
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15 views

Computing System Noise from Phase and Magnitude Response of Black Box Circuit

You are given a black box circuit of passive elements with a single input and output. You have the ability to sweep it's phase and magnitude response. Will you also be able to compute it's noise PSD ...
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What is the effect of the capacitor on the input power and torque of permanent split capacitor (PSC) single phase induction motor?

I need to know the effect of the capacitor on the input power and torque of a permanent split capacitor (PSC) single phase induction motor.
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1 answer
56 views

RC 90 deg phase shift

What does 90 deg phase shift actually mean? Like, consider this below RC circuit. simulate this circuit – Schematic created using CircuitLab From what I understand, when I apply a sine wave at ...
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2 votes
1 answer
50 views

Problems of optimal commutation depending on number of pole

I am trying to design a three phase 4 pole motor, control with six-step. My problem appears when I draw the commutation to try to see how everything work. First, with a basic three phase 2 pole, there ...
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1 answer
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Conceptual understanding of phase power vs. line power

I am looking at two formulas: P = √3 x VL x IL x Cos Ф P = 3 x VPh x IPh x Cos Ф Now assuming P here refers here to the total power. Could I take VPh and IPh and combine those terms as P (Phase)? Same ...
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  • 13
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1 answer
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A non-inductive behavior in low frequency of an inductor

I have a question that has been torturing me for a while now. I cannot give you guys all the information, however, what I can say is that I have this measurement of an impedance of an electrical ...
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0 answers
59 views

How to get I and Q components from echoes of a Chirp signal?

The Bandwidth of the signal is 10 MHz, the central frequency is 20 MHz, sampling frequency is 26.6 MHz. So, if to get the Quadrature component I have to shift the signal of 90°, how do I get the phase ...
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2 votes
1 answer
53 views

LTspice AC Analysis extracting only the phase shift value at a certain frequency

I am trying to extract the phase shift value at a certain frequency in AC Analysis mode of LTspice. .meas AC Ph_Shift FIND (V(out)/V(in)) WHEN FREQ=50 With the ...
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0 answers
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How consistent is phase on the National Grid?

How consistent is phase on the National Grid in the UK? If I have a device plugged into a socket in Scotland and another down in Cornwall, how far out of phase will the two AC sine waves be? I have a ...
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3 answers
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Making 2 clocks with phase shift

I'm trying to create 2 clocks with phase shift for 1/4 cycle time: ...
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2 answers
111 views

220 volt, three phase issue

My company had a machine moved from one facility to another. The machine was fully operational when it was disconnected. It operates on 220V three phase power. When powered up at the new facility the ...
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0 votes
1 answer
43 views

Magnitute and phase, operational amplifier

I was solving exercises related to operational amplifiers and I got to a part where I am not sure how I am getting the arg part of the result. Can someone please explain this to me. Thank you very ...
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5 votes
3 answers
498 views

Noise in tunable sine wave oscillator

I recently soldered a tunable phase shift oscillator on a bread board pcb. It produces a sine wave in the range from 80 Hz to 3,3 kHz. The oscillator frequency is tuned with a dual 100k potentiometer. ...
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1 vote
2 answers
60 views

Loudspeaker alignment graph

Hopefully a simple question. I was wondering what the blue line in this graph represents. This is looking at loudspeaker modelling. The red line is obviously the frequency response as loudspeakers are ...
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3 votes
1 answer
328 views

Why multiple series resistor on single phase metering reference design with HLW8012 and BL0937 IC

We need to implement energy monitoring in our smart plug. We are considering 2 ICs HLW8012 and BL0937 for this purpose and following are their reference designs in their data sheets. I am trying to ...
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1 answer
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How to reconstruct phase data from magnitude only data in a frequency domain function?

I'm trying to do a reverse-engineering a software called LEAP from the now disappeared LinearX company. This software can perform an operation called "Minimum Phase Transform". This takes ...
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1 vote
2 answers
94 views

Snubber Filter Circuit Not Working Triac Dimmer

Hi I am working on a project using a triac to do phase control dimming of 120V ac powered devices. I recently translated my project from perfboard to SMT using an SMT fabrication service. The project ...
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0 votes
3 answers
71 views

Bode Phase Plot for negative transfer function

My question is relatively simple. Supposing that we have a transfer function of the type \$\frac{-Kj\omega}{\omega_0}\$. Then for the phase Bode plot, I should start from \$\pi\$ and then add \$\frac{\...
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1 vote
1 answer
72 views

How to find the complete transfer function based on phase measurements

I want to find the transfer function with a certain number of poles of an electronic amplifier circuit based on the same number of phase measurements. For example, I have 3 phase measurements: \begin{...
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2 votes
1 answer
192 views

About power dissipation of capacitors and inductors & I-V phase difference

For instance, The Art of Electronics (by Horowitz & Hill) states that ideal capacitors cannot dissipate power, even though current can flow through them, because the voltage and current are 90° ...
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-1 votes
1 answer
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3 Phase Motor to DC Output

In a standard car alternator there is are 3 diodes that keep each of the phases from ever pulling electrons. There is then a capacitor to smoothens it all out. However how is it possible that the ...
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0 votes
1 answer
58 views

How to determine electric field polarity from electric field mill signal?

I have built an electric field mill like this, more info can be found in the (short) wiki article: It works by exposing the sensing electrode to the ambient electric field, which (depending on E ...
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3 answers
143 views

Calculating peak period jitter from datasheet that lists phase noise

The oscillator I plan on using list phase noise for a 20MHZ signal as: (100Hz) -124 dBc/Hz (1kHz) -140 dBc/Hz (10kHz) -148 dBc/Hz 100kHz -155 dBc/Hz (1MHz) -157 dBc/...
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  • 141
1 vote
3 answers
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Does a product see any difference from being powered by a single phase 240 V European outlet versus 240 V from a split phase 240V (120/120) US outlet?

I have seen similar questions and the answers always move on to the physics of the transformer and a center tap. I get all that, I think. My question is whether sophisticated electronics (specifically ...
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1 vote
2 answers
284 views

Measuring relative phase of two clocks

I'm working on an FPGA and I have implemented a component that can take a clock and dynamically change the phase. Now I think there are some problems with this component because the target of the ...
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0 votes
0 answers
101 views

How to protect potentiometer in adjustable soldering iron?

I have an adjustable soldering iron and noticed that recently at some position of the adjustment potentiometer (R3 in the schematic below, this is the potentiometer ...
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3 votes
1 answer
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Phase relationship of multiple Fractional-N PLLs with same reference clock

I think I understand the general operation of PLLs in the case where a single reference clock generates a single output clock. Once the PLL is locked, there is a deterministic relationship between the ...
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0 votes
0 answers
33 views

Multi carrier frequency conversion and phase noise

I have a oscillator with a phase noise mask that was represented in dBc at specific offsets from a carrier. Two options with a multicarrier signal going into a converter, apply the phase noise mask (...
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0 votes
2 answers
96 views

What happen if one connects two live phases together? [closed]

If a house is running on 1 phase wire and is flipping instantly or not stable for a short period as it drops from 200v to 170v and return back to 200v in 10 seconds. Would connecting another phase to ...
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0 votes
1 answer
42 views

Phase Difference Between dynamic voltage and input current

I have a RLC circuit, and I know if we wish to calculate the phase difference between Voltage and Input current then the formula is $$ \phi = \tan^{-1} \frac{X_L -X_C}{R} $$ But as we already know, ...
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0 votes
3 answers
99 views

AC circuit working principle

When a power source is AC (alternating current) one is a phase and the other is neutral. Does phase and neutral lines change their polarity over time or only phase line voltage and current up and down ...
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2 votes
2 answers
294 views

Is there a way to measure the Phase Shift between the input and the output voltages related by the equation: \$V_o = V_i(a+jb).\$? [closed]

Say \$V_i\$ is an input voltage, and the output voltage is given by \$V_o = V_i(a+jb).\$ Is there a way to measure the Phase Shift between these input and output voltages?
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27 views

How to implement this phase rotator

question 1, I think that we can use si,sq ,siq to control the phase move.In my understanding,in the Fig. 5. Phase rotator ,si, sq correspond to the values on the horizontal and vertical lines.siq ...
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5 votes
3 answers
549 views

About the torque-free charging operation

I and one of my friends are working on understanding the below context (paper link): The study provides an extensive overview of on-board integrated chargers for electric vehicles that are based on ...
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1 vote
3 answers
124 views

How did they get 240V from one leg (L1)?

A neighbor lost his L2 connection to his house. The symptoms were as expected. Fifty percent of the lights and outlets did not work and all his 240V appliances (AC, fryer) did not work. The utility ...
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0 votes
1 answer
79 views

In a delta wound 3-phase motor, how are the phase and line voltages equal?

After researching the 3 phase delta configuration, I'm confused as to how these three line-to-line and phase relationships can all be true. I have found the voltage/current relationships here , and ...
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5 votes
2 answers
210 views

Why do crystals have 0° phase shift at series resonance?

I am trying to understand the inner workings of crystal oscillators, but I do not understand why the current has 0° phase shift at series resonance. To my knowledge this is the equivalent circuit for ...
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2 votes
0 answers
38 views

LTspice .MEAS doesn't unravel branch wrap

When doing AC analysis in LTspice, there is an option to unravel branch wrap (i.e. phase un-wrapping). However, if we use .MEAS to find magnitude and phase, there is no option to unravel branch wrap, ...
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1 vote
2 answers
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Pseudo Periodic Signal

I am reading a research paper Eyer 1999 in which they used these terms so I want to know about them since there is no source on which I can learn about these terms so that's why asking it here, it ...
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4 votes
2 answers
734 views

How to measure phase accurately using LTSpice?

I am trying, and failing, to measure phase in LTSpice. I've used the suggestion here ...
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2 answers
67 views

What is the percentage modulation of phase modulation PM?

What is the percentage modulation of a phase modulation (PM)? Can you further explain and give detail? I am currently stuck in finding the information about this
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0 votes
1 answer
27 views

trigonometric expression in phased array

i have tried to develop the angles in the diagram bellow. there is not triangle where we have 90 degrees phi and theta together. why phi=90-theta ? Thanks.
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0 answers
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Underlying reasoning behind lead and lag nomenclature of compensation

If \$0<z, \;p\$, the Laplace transform transfer function \$\frac{s+z}{s+p}\$ constitute two distinct types of compensators. If we look at this schematic, \$0<z<p\$ (lead compensation) implies ...
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0 answers
87 views

Why are complex valued zero and pole not used in lead or lag compensation design?

Consider the compensation transfer function \$\frac{s+z}{s+p}\$ so that the inequalities \$0<z<p\$ and \$0<p<z\$ correspond to lead and lag compensation respectively. It can be seen that ...
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0 votes
1 answer
239 views

Clock Phase Shift Not Working on FPGA

I have a project where I am using two clocks at the same frequency, with one having a -90 degree phase shift. The FPGA board I am using is an Nexys A7-100T configured with Vivado in VHDL. I have used ...
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1 vote
2 answers
72 views

Finding the kVA loading after improving the power factor

This is a homework question I've been attempting. But the answer I get doesn't match with whats given and I don't understand why my method is wrong. This is the question with answers. Here's what I'...
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0 answers
80 views

Understanding Output From DFT

I should preface this by saying I'm a novice at all of this: I'm designing a system (using a stand-alone FPGA board combined with an ADC that offloads data to a GPU) that is supposed to look for high ...
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28 views

Usually AC quantities have the x-axis as time, but phase shifts are done in angles. How is there not a unit conflict?

This feels like a very specific and stupid question, but I have studied AC circuits for a while already. I just didn't think about it that much, but why is it established that the x-axis we use for ...
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