How do I generate PWM signal in MATLAB?
% PWM Signal Generationclc;close all;clear all;t=0:0.001:1;s=sawtooth(2*pi*10*t+pi);m=0.75*sin(2*pi*1*t);n=length(s);for i=1:n if (m(i)>=s(i)) pwm(i)=1; elseif (m(i)<=s(i)) pwm(i)=0; endendplot(t,pwm,'-g',t,m,'--r',t,s,'--b');grid on;ylabel('Amplitude');xlabel('Time index');title('PWM Wave');axis([0 1 -1.5 1.5]);This is the Program Code through which you can generate PWM signal in MATLAB R2010s.or else you can learn it from youtube also, several links are given there. This one can help you better.
How can I generate 4 PWM signals in atmega8?
The ATMega8 has 3 timer/counter units, although only Timer/Counter1 and Timer/Counter2 can be used to directly generate PWM signals on the pins labelled OC1A, OC1B and OC2 on page 2 of the datasheet. See the Timer/Counter sections of the datesheet for how to configure them:http://www.atmel.com/Images/Atme...To generate more PWM channels (without trying to implement them in your software), you'll need a separate PWM driver chip that you control with your microcontroller. I haven't used any myself, though I'm sure there are many to choose from, such as this one listed at SparkFun with 16 PWM channels that are controllable with 5 output pins from your ATmega8:TLC 5940 - PWM DriverAs was mentioned by others, using the ATmega328p (currently used in the Arduino Uno) would allow 6 PWM channels on the chip itself. As an 8-bit AVR, programming it would be similar to the ATmega8. Info can be found here:ATmega328
What are different ways of generating a PWM wave?
Original question, in case someone edits it again:How do I generate a modified PWM for an inverter?For this first one, you’ll need to generate a low power sine wave. This can be from a variety of oscillators. For lower frequencies, a phase shift oscillator works.Then you need to generate a triangle or sawtooth wave at a much higher frequency than the sine wave. A two Op Amp oscillator circuit can create this, or merely charging a capacitor with a constant current supply and then discharging it can create a sawtooth (ramp) wave.Feed both the sine wave and triangle wave to a high speed comparator. The output will be a PWM wave at the frequency of the triangle wave, with the PWM pattern recreating the sine wave. Thanks to Paul Hills website for the image:Your triangle wave should be of a much higher frequency than this to make it simpler to filter out harmonics, thanks to Blogspot via AVRFreaks for the image:If you are using a microcontroller, you don’t need to generate a sine wave, triangle wave, or such. You can do this with just a microcontroller, with drivers for the MOSFETs.Just generate 1/4 of a cycle of the PWM values you’ll need, and store them in nonvolatile memory on the microcontroller. Then you play them back for the first 1/4 cycle, then play back reversed for the 2nd 1/4 cycle, then forward but inverted for the 3rd 1/4 cycle, then reversed and inverted for the 4th 1/4 cycle.Even better, use Don Lancaster’s magic sinewaves. It is a streaming bit code just sent as a PWM to generated a sine wave. The special thing about it is that it is optimized for a relatively low frequency, therefore less power is used during switching events, but the harmonics cancel out. So properly done, you can theoretically have no substantial harmonic content until the 29th harmonic.Much simpler to filter.Intro to Magic Sinewaves:http://www.tinaja.com/glib/msint...Magic Sinewave page and codes:Guru's Lair Magic Sinewaves LibraryNote: Same routine. You only need the first 1/4 cycle stored.
For generating high frequency carrier signals in PWM which controller should be used? Are there any of these available that can do it without coding?
Go for SG3525 IC. This IC can generate high frequency PWM signals. It will handle comparison too. Check the datasheet out. https://www.google.co.in/url?sa=...
How do I generate a modified PWM for an inverter?
If you are using a microcontroller, you don’t need to generate a sine wave, triangle wave, or such. If you are going to do that, just add a comparator and a bit of logic, and skip the microcontroller.You can do this with just a microcontroller, with drivers for the MOSFETs.Just generate 1/4 of a cycle of the PWM values you’ll need, and store them. Then you play them back for the first 1/4 cycle, then play back reversed for the 2nd 1/4 cycle, then forward but inverted for the 3rd 1/4 cycle, then reversed and inverted for the 4th 1/4 cycle.Even better, use Don Lancaster’s magic sinewaves. It is a streaming bit code just sent as a PWM to generated a sine wave. The special thing about it is that it is optimized for a relatively low frequency, therefore less power is used during switching events, but the harmonics cancel out. So properly done, you can theoretically have no substantial harmonic content until the 29th harmonic.Much simpler to filter.Intro to Magic Sinewaves:http://www.tinaja.com/glib/msint...Magic Sinewave page and codes:Guru's Lair Magic Sinewaves LibraryNote: Same routine. You only need the first 1/4 cycle stored.
How do I read a PWM signal using AVR?
Maybe just a few lines of code on an Arduino. See Three Ways To Read A PWM Signal With Arduino. The Arduino pulseIn(PulseIn_Pin, HIGH); looks pretty easy.
How can I generate a single PWM at a switching frequency of 5khz and duty cycle controlled by the user?
Let R1 + R2 = R = The variable pot total resistance TH= 0.693 R1. CR2=R-R1TL =0.693 (R-R1)CT=TH+TL= 0.693 RC =1/5 KHzDuty cycle = TH/ ( T)The potentiometer can be varied manually to adjust the duty cycle.
What is a program for generating sine PWM 50hz using ATmega?
This PDF Page on google.co.in
How can I convert an irregular PWM signal with a duty cycle of 95 to 99% to an analog signal?
Ilya Veygman has some good answers, but the RC method is still valid. In your example, forget the periodicity of the pulses, and focus on the pulse alone. From your image, I can't tell the pulse width(my vision, not your photo). But an RC integrator's time constant is calculated by: 1/RC. The first time constant is how long it will take the cap to charge to 67%(I believe) of its full charge. The input is into the R, then the output of the R goes to the C, and the other lead of C goes to ground, normally.The RC time constant must be much higher than the duration of the pulse. As described, one would see the cap charge as a fast rising signal that slowly slopes to 67%(in one time constant). Cascading another RC integrator calculated to the new (now sloped) pulse will smooth the edges. Each TC should be 5-10 times longer than the original pulse. Depending on the app, the two integrators could feed into a cap(possibly an small electrolytic) to further smooth the rise and fall of the pulse, or use a coupling cap at this point to remove the DC component. Use the reactance formula to find the correct value, one that settles the pulse to the correct AC voltage for your app, or to apply to a simple transistor circuit.