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Hi! Do u want to generate sine wave? if the answer is yes then there are two different methods of doing it. one is to use a DAC (digital to analog converter)with a controller and the other one is to use PWM(pulse width modulation) with an RC filter. Regards.
Hi, I am using 16f72 asm code to generate sinusoidal PWM.I not getting idea to start,Theory says that sine pwm can be generated by comparing sine and triangular waves. I know how to use CCP module.can anyone help me how to do the same using software. Please give me some ideas to start my project
how to generate sinusoidal pwm pulses using microcontroller by comparing sinewave of 50hz and triangular wave of 3khz
i,m using inverter to control the speed of AC induction motor. switching for this inverter by using tyristor or IGBT. 3 phase PWM were be the pulse for this switch..i use 1khz freq for triangular wave and 50hz for sinusoidal wave, by comparing this 2 wave PWM was generated. i want to know, capture mode and compare mode is the right choice to genera
Microchip have a free program, 'dsPICworks Data Analysis', which you can download from here: You can use it to generate waveform tables.
Hello everyone. Can any body plz tell me how to implement sinusoidal PWM using PIC micro. I have read quiet a few application notes regarding its use but i want to understand how does a single microcontroller can generate sinusoidal waveform in conjunction with the inverter bridge. Plz help.
I am making a pure sine wave inverter . In an intermidiate stage i have to drive the mosfets using SPWM. so anyone please tell me how to generate sinusoidal PULSE WIDTH MODULATION using ARDUINO board.??
if u just need a single tone, then u can store the values for the sine in a ROM and throw it out on each clock. If u need different tones to be generated, then u have to implement a Phase Accumulator also.This concept u can get it easily if u go through any of "DDS" or "NCO" implementation. search in google for NCO or DDS.
After extensively googling I found no valid circuit to generate two sets of triphasic sinusoidal signals simulating the V of a genset and its load. It should be able to change phase of I wrt V. Peak value 3 to 5 V is enough. I feel that something with shif registers would be the way to go. If ready made, would be better. Taking signals from r
I don't know if it can be done or not. My thought is Pass the input signal to a F2V then V2I to generate the required current Use current mirror which multiplication and pass thru ICO to generate final sine wave. There, you can use the multiplication to act as multiplication or division
Hi all, i have a quartz at 100MHz square wave i want to generate 500MHz sinusoidale at output wich component or circuit can do this???? thank s in advance regards
Does DSB or SSB mixer generate LO frequency harmonics internally? Meaning if I feed sinusoidal LO, will there be mixing results of RF+2LO or RF-2LO
Hi I am trying to program closed loop SPWM controller for an inverter using dsPIC33. I get the feedback ac current and want to compare it with a sinusoidal reference current. So can anyone tell me how to generate 60Hz sinusoidal reference current in my dsPIC33. I only have the peak value of the sinusiod. Any suggestions or sample code (...)
You should be able to implement a filter that has the proper performance--it might be a fairly large(lots of poles) filter, depending what your requirements are. If you know exactly what the 16KHz signal looks like, you could always just subtract the 180 degree-shifted version. You might also be able to do something with a Phase Locked Loop-lock
Can anyone give me simple matlab code which generates a baseband signal?
In MATLAB, there are two types of "Sine Wave" generator (see figure below). One can be found in Simulink library, and another one can be found in Signal Processing Blockset (SPB). When the "Output complexity parameter" of SPB "Sine Wave" block to Complex, it will generate complex sinusoidal signal. What is the different between the sinewave g
Hello friends I developed single phase sinewave inverter usin PIC 16F886 micro controller.I have used sinusoidal PWM technique to generate sinusoidal pulses.I am getting sinewave at out of transformer this sinewave is maintaining at buld loads very nicely and aslo voltage is controlling low battery of 10.5 volts also i
i want to generate sinusoidal pulse width modulation(SPWM), what mode is a suitable choice? CCP mode contain capture, compare and PWN mode. the SPWM is generated by comparing 2 signal wave that is sinusoidal and triangle wave. the intersection of that wave is the point where the PWM is generate '0' or '1'. (...)
Hi, I'm interested in your PWM generator. I have to generate a PWM signal using a triangular wave and an audio signal, I assume it looks like what you were looking after. Were you able to make it? Could I perhaps take a look at it? If you still need help, I have some VHDL background, but this could make my life a bit easier! Greetings!
Hi all, I have designed a DAC. Now I want to test it. I want to apply a digitized sinusoidal signal as a input. But I do not know how to generate such kind of input signal. Could you please advice. Do you have a such example. Thanks in advance.
Hi, it's the first time I write in this forum. I have a problem, I need to generate 3 sine waves(50Hz and dephased) and compare them with a triangular carrier using STM32 evaluation board (STM32F103ZE). My question is: How can I generate these 3 waves? If someone could post some examples we would be very thankfull.
In the past I used a MCP4101 digital pot which has an SPI interface to generate sine waves of approx 2KHz MCP41010 not sure if it would work at 5KHz but worth considering the alternative is a DAC - for example I used Integra development boards with Texas DSP processors and h
Hi, I Have certain doubts. ATMega 16 supports 8 bits while AD9833 requires 16 bit data, how is this achieved? I want to generate sinusoidal waveforms of different frequencies ranging from 100kHz-1MHz. How do i implement this in the program? What is a frequency word? Do i feed in the frequency word to the microcontroller?
Hi Marius, instead of generate sinusoidal waves with PWM, DAC or an analog waveform generator, you can use your microcontroller (or other digital circuit) for generate a square wave at f0 and f1. Then, filter the square-wave FSK with a low-pass or passband filter. That filter has to pass the band centered at about 20 KHz, and the lower (...)
how to generate the sinewave pwm using compare mode in ccp for ccs compiler.. please help me :-D You want to generate SPWM by comparing sinusoidal and triangular wave. But, triangular wave at frequency 1kHz is high that PIC speed can't generate using DAC
how to generate pwm pulses to get 50hz ac from an inverter and plz explain wat is counts and peroiods in pwm
I`ve created my own frequency invertor. I have problem with the program of the microcontroller. I`m using 20 points 1ms each to generate sinusoidal wave but when I connect a load engin it`s turning on pushes. I`ve tried with different conbinations of these 20 points - different dead time, different continue time for each impulse but the rezult is a
%program to generate sine wave f= input('enter the frequency in hertz of the sine wave'); t=0:.0001:5; y=sin(2*pi*f*t); plot(t,y); ylabel ('Amplitude'); xlabel ('Time Index'); TITLE ('Sine wave'); %with samples t = ; % Time Samples f = 500; % Input Signal Frequency fs = 8000;
i'm doing my final year project about "PC based programmable function generator" using PIC16F84A microcontroller. i need to generate 3 kinds of waveforms: square, sinusoidal & triangle. i also need to design and layout a Graphical User Interface (GUI) for the functions of the PC based function generator such as frequency, duty cycle and no. of pul
For best gain the LO level should be high enough to turn the transistors full on to full off. This can be done with a high level sine wave or a lower level square wave. Since square waves are difficult to generate at microwave frequencies, sine waves are used. One thing about the nomenclature is that this mixer topology goes back to 1950 when
E-design thank you very much, you are right, the circuit is used in DVD read channel. now i have another question how to generate the kick signal? You confirmed by message that it is for a DVD read circuit. There are various kick signals (they are normally applied while the servo is switched to open loop).
a ideal switch operation can be get if a square LO is applied to the switching quad in a mixer. But conventionally we use a sine LO . Why?? Is it difficult to generate a high frequency square wave??
yes,Lc circuit is a resonator cicuit..u can generate square wave.
A square-wave is easier to generate with stable amplitude and frequency. It is also easier to check the scope with a square-wave signal than it is with a sinusoidal one. Try measuring the period of a sinewave, compared to a square-wave. The sharp edges of the square-wave signal makes things a lot easier. A similar thing goes for the amplitude,
Hi, Is it possible to drive a H-Bridge with a PIC (16F877) and generate a sinusoidal current waveform? Change the amplitude of the waveform is also desired. Can anybody please show me a sample code in CCS to how top do this? Thanks in advance Jester009
RMS current and voltage are mostly used in alternate current (AC) measurements. If you try to calculate the simple average of an AC sinusoidal (or any other periodic) waveform (current or voltage) symetrical from ground, you will get the value zero, as the waveform is composed of positive and negative values, unless you take only one semi cycle
HI all, I need an ultrasonic interfacing circuit which is to be interfaced with PIC MCU Transmitter Section : It transmit the square wave out from PIC pin Reciver Section: It when receive ; generate a logic(Interrupt). please help
Hi, I'm currently in the process of developing a control scheme for a custom power device using FPGA. The control scheme processes the error voltage through a PI controller whose output (PI output) is used to phase modulate the sinusoidal waveform (50 Hz). The phase modulated waveform is then compared against a triangular carrier wave to generate
hello Guys I want to know how to generate a sine wave using 16F876A + H-Bridge Driver ?? without using DAC
Hello all I need to construct a three phase AC induction motor driver with AT89S8252. Does any body now how to calculate PWM signals and generate them? Please help me... If there is any inverter softwares please send me them...
I understand how to use clarke/park transformers, but personally I have only used them to control induction machines via pwm inverters. In my opinion, the operation is similar in many aspects. AFE control can also use two phase orthogonal (Iα, Iβ, Vα, Vβ) space vector descriptions. As a specific point, a mains f
Hi friends i am doing single phase sinusoidal PWM inverter using micro controller.I have generated sine wave at output using sine controller is pic 16f886 output frequency is 50Hz,and swicthing frequency is 20Khz and output at no load is 250 volts rms.I used PWM modules in the controller to generate SPWM. My problem is when i am switchi
hi friends, I need a detailled explanations for the principe of PWM and how to generate sinwav signal from a DC one. my secon question concerne the current, how can i calculate AC current from DC one in DC-AC converter? many thanks
Hi friends can anyone tell me how to calculate values for sine look up table to generate 220V rms value using sinusoidal adc is 10 bit adc,output frequency is 50Hz.
Hi, I m trying to generate a PWM signal at the output of the lt1016 comparator. My idea is to compare a basic sinusoidal signal with a linear ramp signal aids of this comparator. The linear ramp (called IN-) is plotted in blue. I don't have idea to set up a correct linear ramp, what is the proper frequency the linear ramp should have? [
An electromagnetic wave propagating through space is always a plane wave. It means that its E and H component alternate in a sinusoidal manner, perpendicular to the axis of propagation. It is a "transversal" wave. Only close to radiators that generate the wave, the shape of the wavefront runs off a "point", so it is spherical. As it travels fart
Here is the clue... So if you want to listen 500Hz sinusoidal, generate enough data sample with linspace function. Then feed this data sample into MATLAB's built in function which will convert them into sound. Sorry, I cant remember the function name right now, but its easy enough to find in MATLAB demos and just google it. Hope this h
Hi, You simply can't generate a sinusoidal PWM using this method. In your for loops, you are updating the duty cycle several times before one period of the PWM is completed. The comparator will miss lots of cycles and output useless PWM signals. You can use the timer interrupts and a look-up table containing the duty cycle values corresp
i need to generate triangular wave using matlab for sinusoidal pwm.....can u suggest ....some methods.....i m using matlab7.8 version
I am trying to simulate a CMOS OTA-C oscillator using Pspice. The OTA is simulating the correct transfer curve. But when I need to generate an oscillation, it gives a complete flat response. I have tried it out using ways like initial charge on a capacitor/ inputting a damped sinusoidal input and also trigerring it with a current pulse. I do no