Questions tagged [sinusoidal]

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Triangular output from differential amplifier

Can I use a long tailed pair with differential sinusoidal input to generate triangular pulse output? Perhaps use clipping to my advantage? If not how can I convert a sine wave to triangle using ...
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1answer
56 views

Can a system get immediately to the sinusoidal steady state?

Suppose we have a theoretical LTI causal system with zero initial conditions and we apply a sinusoidal input at t=0. If the system is initially at rest, will the output be equal to H(ω)cos(ωt+Arg(H(w))...
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i need help solving the following steady state sinusoidal analysis question

its been a while since i tried to solve these questions so i need some help solving these. Sinusoidal Steady-State Analysis Take into account that C R L ω ω 1 = = and therefore LC 1 ω = and C L R = . ...
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49 views

Sinusoidal Driving BLDC without FOC?

I want to drive my BLDC motor sinusoidal. In this point I want to model my system correctly to analyze it better. So I want to simulate it in simulink first. To get model with sinusoidal driving: I ...
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42 views

Trying to Dampen a Boosted LC Circuit

I am currently implementing the circuit shown below where the first stage is a boost converter and the second stage (output stage) is an LC circuit with a boost topology. The goal is to take a 24V DC ...
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1answer
63 views

Are impedance calculations only specific to sinusoidal inputs?

All impedance formulae we've derived in my course and calculations e.g. combined impedances in series have all assumed sinusoidal steady state. My question is, does the notion of "impedance" ...
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1answer
89 views

Design a triangular wave generator using a sinusoidal input

I've been going through online assignments regarding circuit designs. I've gotten a bit stuck on this one: Using a sinusoidal input voltage of amplitude 5 V and frequency 100 Hz, I need a triangular ...
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1answer
648 views

How to convert sine to exponential form? [closed]

In this question, he converted the sinusoidal voltage to exponential voltage. what's the formula used here ? This is not the same one used in this video Here is the formula derived in the video
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1answer
37 views

Can AC harmonic quantities be expressed as a sum of phasors of different frequencies without confusion?

https://www.electronics-tutorials.ws/accircuits/harmonics.html The problem with AC harmonics is that each term has a different frequency, being a integer factor of the first frequency. I was wondering ...
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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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1answer
177 views

Find the phase angle between two functions

Apologies if this is better suited for a mathematics forum, it's from my circuits textbook so I've decided to post here. Below is a practice problem from the textbook, with the provided solution. If ...
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1answer
981 views

What is the importance of peak factor and form factor?

I get that form factor and peak factor are suppose to be ratios involving the RMS, maximum and average values of current or voltage for AC circuits, but I don't get specifically why those ratios are ...
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3answers
64 views

Driving multiwinding current transformer

About the circuit below: I'm using a Current Transformer with two identical secondary windings, L1 and L2. I can use them indistinctively since they are 1:1. The relationship with the primary is 1000:...
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1answer
211 views

Can FOC be done with only one PID controller and a lookup-table that determines phase-offset?

Normally two PIDs are used to do torque-control with FOC -- one for the direct torque and one for quadrature torque. The reason for this is described here: Why are two PID controllers needed for FOC (...
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1answer
71 views

Reference clock of 400 MHz oscillator or 20 MHz and multiply by 20?

I am trying to design a sinusoidal signal generator using AD9954 which is a Direct Digital Synthesis (DDS) with takes a maximum of 400 MHz crystal oscillator as reference frequency. It also has a ...
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Why do sensors or biosensors use AC excitation signal and not square wave signal?

I have recently started looking into transducers to measure a natural physical phenomena. The sensors I read about, especially electrochemical sensors like interdigital electrodes use a sinusoidal ...
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1answer
115 views

Finding the total impedance and voltage across open terminals

The question that I'm trying to solve is the following: In the circuit shown below, what is the total impedance in ohms across the open terminals? What is \$v_{T}\$ if \$v_{L}\$ is 80 vrms? This is ...
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1answer
1k views

How does HFI (high frequency injection) work with BLDC motors

How does HFI work with BLDC motors. In this video: VESC HFI: Sensorless position tracking at zero speed he explains how HFI works, however i don't get how it can work with motors that have trapezoid ...
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1answer
727 views

Difference between SVM and sinusoidal PWM in BLDC

In this answer Answer to question regarding difference between 6-step and FOC, the author said: "Likewise if you have gone to the effort to implement a FOC you might as well implement a SVM block to ...
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2answers
110 views

How do I proceed when the current is Io = 2cos (wt)?

I have this problem: And I would like some help with how to proceed. My own thinking: I think Io = 2cos (wt) mA should be 2 mA. For VR (t) I think it should be VR (t) = 2 mA * 1000 = 2 V and for ...