Questions tagged [phase]
For questions about AC phases (e.g. three-phase systems) or phase in the context of waves, transfer functions, etc. Consider using in conjunction with related tags such as "three-phase", "transfer-function", etc., as applicable.
304
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Stepper motor stepping sequence analysis
I'm currently trying to educate myself on the stepper motor. The figure below is what I am trying to analyze.
First I wanted to analyze the step angle for full step operation and half step. Which I ...
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"phase gradient", what is it?
I have found an interesting paper published on the website of Huawei "Very-Low-Earth-Orbit Satellite Networks for 6G"
I have a question regarding the following part:
"3D UE- centric ...
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Why is the voltage distribution a quarter wavelength out of phase with the current in a half-wavelength dipole antenna?
Why is the voltage distribution a quarter wavelength out of phase with the current in a half-wavelength dipole antenna,
as show in this image?
It makes sense that in a graph over time, the voltage at ...
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What is the phase displacement of fault currents on each phase in a symmetrical fault?
In a Line-Line-Line-Ground symmetrical fault, is the fault current on each phase also displaced from each other by 120°?
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ZL30251 phase aligned
I just want to confirm whether the part zl30251 has phase aligned outputs? If not, can it be aligned?
Also, I can confirm that both the outputs are LVCMOS.
Can you please help me with this?
Also, i ...
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Solid State Analog Phase Shifter
I have a single A/C source that I would like to phase shift into three different phrases, offset by 120 degrees, essentially resulting in something like below:
I've seen out in the real world, folks ...
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2
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82
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Air core inductor impedance vs frequency graphs
I wanted an inductor with at least 100 μH, so I used a PVC pipe and some enamelled wire (AWG 21 if I recall correctly) to create an inductor. The inductor does serve its purpose fine as a load ...
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1
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141
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3-phase to single-phase power - motor
I have a circuit with a motor that uses 3 phase power supply.
The circuit includes a control relay (like this ), (L1 L2 L3 NO A1 and T1 T2 T3 - A2) and a thermal relay (like this) the A indicator ...
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Forcing multiple-quadrant TRIAC operation through gate ringing
I got the possibly hare-brained idea to cause a single TRIAC gate pulse to go positive and negative, and thus fire in (maybe not all four but) more quadrants:
ThecLTspice simulation seems to show ...
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180° phase difference alternator synchronisation
Consider two alternators with 180° phase difference in parallel feeding a purely resistive load. In my understanding, phase cancellation will occur. So, what happens to the power in the circuit?
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Transformer 220/380/440 V 24 V explanation
I have a circuit that uses three-phase electric power (without neutral). There is an old transformer in this circuit (see image). It converts 220-440 V to 24 V.
The input has the handwritten numbers &...
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Fl5150 in 3-wire application
I was curious to navigate through the datasheet of FL5150/FL5160 phase cut dimmer IC:
Datasheet
and for circuits that operate on 220v, there is only a 2-wire application in the datasheet, how can we ...
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2
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132
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What are the gain and phase margins from this Bode plot?
I thought I had a decent grip on how Bode plots work yet for this model that I am working on, I need to implement a lead or a lag compensator. A lead compensator, which I was thinking about ...
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Meaning of Phase Angle
In this Application Note, section 3.1,
Can someone help me to understand the meaning of "magnitude of phase angle of the load" in simple terms?
Phase angle between Rx and Tx or what does ...
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108
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Why do I get the wrong phase shift?
I am trying to compare theory vs simulation values and it seems to be that there are differences. I am using Multisim to simulate a RLC circuit, the LC are in parallel and in series to the resistor.
...
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Why doesn't the bypass capacitor cause phase shift in this oscillator circuit?
I am trying to understand oscillator basics. I thought I already understood how a capacitor works, but I still get confused about it.
This circuit is an RC phase shift oscillator. I understand that we ...
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Linear phase with audio amplifier
I came across the following amplifier for an audio ADC input stage in an application note for the CSxxxx codecs (appnote, figure 2. Codec datasheet. VQ is approximately 2.7V for biasing.):
I did an ...
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How to determine saturation in DC smoothing choke with capacitor, and how to simulate in LTspice?
This question addresses some of the issues with a choke made from a microwave oven transformer for producing smooth DC from a phase-fired SCR controller, as discussed in this question.
The choke ...
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Different units of phase noise
I am not an electrical engineer and I am confused about the units of the phase noise. I really would appreciate any help.
This is the phase noise of a laser. The unit is 'dB((Rad/√Hz)/m)'. What does ...
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Simulated phase noise of the system
I am using Genesys 2012 software in order to simulate generated signal and noise of the system, simply speaking, it generates a CW signal. In order to calculate generated signal and noise I use a ...
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Why does PSPice invert this AC current?
I'm running a simulation on a simple circuit in PSPice 9.1:
This voltage supply is set to provide a 1V AC signal with a frequency of 60 Hz. As the load is only resistive, the current should not have ...
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2
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113
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How does this phase advance loop filter work?
I am reading this paper titled A Versatile Digital GHz Phase Lock for
External Cavity Diode Lasers. This is part of the circuit.
I am confused about the functionality of the part labeled "Phase ...
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4
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157
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PLL phase frequency detector
If there is a constant phase difference between the VCO signal and reference signal, the phase frequency detector will always givr an error signal. How can the PLL lock in this condition?
I mean the ...
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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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336
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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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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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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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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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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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108
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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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65
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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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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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184
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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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1
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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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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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1
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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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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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2
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184
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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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3
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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
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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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271
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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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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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1
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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
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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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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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2
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387
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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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170
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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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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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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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