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162 Threads found on Sine Wave Filter
Hi, 1) Any idea why the FIR filter does not attenuate the amplitude of the input signal? Could be an error in the calculation of the FIR coefficients? usually for two different frequencies you need two different sine tables. My assumption is: That you just modified the data_rate for the sine generation and used the same (...)
I assume that you are talking about 230V single phase. In that case first you have to convert that AC (50Hz) to DC using rectifier and filter then using H bridge (IGBT) and sine PWM pulsing you will get sine wave of your required frequency. By varying the pulsing from microcontroller you can obtain 48Hz or 52Hz.
I produce a rectified sine wave 1Vpp 100Hz using a PIC + DAC 12bits. I would like to smooth the line by applying a filter. What filter do you suggest? 135668
Hello, I am designing and building a simple radio transmitter just to practise my electronic skills and learn a little bit more. I started by designing a clapp oscillator, which produce a sine wave with a fundamental at 1 MHz (the goal), and many harmonics at 2 MHz etc. My first question is if I should add a band filter to try to reduce (...)
You can have look at the basic working theory @ Its implemented for LPC2148 but the underlying working is the same. You need to generate or use a hardcoded sine lookup table which feeds values to your PWM block and at the PWM output use a filter which acts a D
Problem is also that the bridge requires sine rather than square wave input. A filter (e.g. low-pass) is required. Could insert an amplifier too.
At the output i am using 1kOhm and 102 to filter. 102 means 1 nF? 1k*1nF = 1?s time constant = low pass cut off frequency 160 kHz. How should it filter 20 kHz pwm? Secondly, why are you stepping through the sine table up and down alternatingly? Makes no sense. A sine full cycle should be repeated continuously, either up- (...)
Hi guys! I have one simple question. If I design a filter circuit for a sine wave signal, is it possible for the same filter circuit to be implemented for different type of signals (for example square wave, ping, etc)? The signal have the same frequency and used in the same environment. If yes, what are the (...)
no other requirements? THD, impedance? phase noise? Perhaps sine filter on PECL output
A 40khz squarewave has harmonics at 80kHz, 120kHz, 160kHz and many higher multiples. An RC lowpass filter can be made with one series resistor then a capacitor to ground and it can reduce the harmonics a little but the filtered waveform will not yet be a sinewave unless many RC (...)
For designing and measuring an audio amplifier I use a sinewave to measure its output power at clipping and its distortion. A sinewave has a defined peak to RMS relationship (peak V= 1.414 times RMS V) and has no harmonics. SPWM has switching artifacts that must be filtered out with a very good (...)
details of your output choke? which you assume is saturating? if you put an RC filter on the o/p of your H bridge, you can look at this on a scope and you should see a sine wave, if you operate your inverter with no load, unless the filter is properly damped (and not resonant at Fsw or Fo/p) you may well see some (...)
hi, What type of feedback amplifier (type-2,type-3 or PI) is used in a pure sine wave inverter? Suppose an inverter consists of a h-bridge and a low frequency iron core toroidal transformer. H-bridge is derived by sinusoidally modulated PWM (20KHz). At the secondary of the transformer there is a filter to get filtered (...)
I have a Pic16f628a does anyone have a pure sine wave inverter design with a hex I could build with pcb also something like 500 watts or more.
Sounds like a useless setup. Bandwidth respectively ac response is defined for sine input signals, not square wave. Usually AC response is determined for small signal, e.g. using AC analysis of a circuit simulator (with VAC source). A large signal transient analysis can be performed with different waveforms (e.g. VSIN or VPULSE), but (...)
I'm new here, I have some fairly basic doubt. I am creating a PWM signal in MatLab by comparing a sine wave (50Hz) and a triangular wave (2kHz) .... 1- So what is the PWM frequency will output? 2- After getting the PWM signal filters I want to get a sinusoid, using an LC filter, but do not know what (...)
The half-bridge applies 12 V peak-to-peak, so 6 V peak. The secondary will receive 6*(220/9.5) = 140 V peak. Since the DVM is calibrated for sine wave the 74 V reading is not unreasonable even if a little lower than expected. If you can't get a true RMS meter, half wave rectify and filter the output, this will give you the (...)
Your reservoir capacitor takes a pulse of current only at the peaks of the incoming sine wave. This high current is saturating the transformer core. You need a better transformer or a choke input DC filter. Frank
Thanks for the reply. I didn't quite understand some of it. So you're saying that you take two VCOs and mix them together (one of which is a voltage controlled cavity resonator)? What did you mean by "offset by the fmax"? In my example (1 MHz to 5 GHz), can you give some numbers? I can imagine that you could mix together two oscillators, one tuna
Hi all, if we have a current mirror to generate a current source signal or sink signal, with repetitive rate frequency, such as sine wave, are we able to apply some low pass filtering circuit directly to this current, and generate a close to DC level current? Thank you!
hi, i am going to design pure on-line sine wave inverter, ranges from 600va to 1000va capacity. i analyzed some reference design and i got how to make it. but only the point is choosing input EMI line filter and output flyback transformer. In reference design there is long calculation but i unable to get that, please anyone help me?
I am using this circuit. As DC bus I am applying currently 30V and at output I am able to achieve a sine wave by further employing a filter Circuit In theory what should be the peak output voltage of the sine wave???? Shouldn't it be +30V I am getting a peak of +12.5V and 25V p-p. Hi Who told that out put (...)
Hello to all. I have built a pure sine wave inverter from 12v to 230v AC at aproximately 500W. The DC/DC converter is the usual forward converter with sg3525 and ETD39. Now my actual problem is the LC filter at the output. The output is 50HZ sinewave. The SPWM is 24.3KHZ. The H bridge (...)
The output of a first order filter can be most simply predicted in time domain, it's just a succession of exponential waves. The first derivative will be always discontinuous, so it can be clearly distinguished from a sine.
1. Control system is a generalized theory and low pass filter is an application. That's the only relation between them. 2. Every random signal is composed of basic types of signal. Just like when u do Fourier transform of a signal, u fins out all the frequencies within the signal. And every signal is a sine wave, a basic building block of (...)
It depends what topology is used. Half bridge resonant or full bridge flyback or feed forward. Square wave, tri-level , pseudo-sine wave one must also consider egress noise for total filtering of CM and DM filters and define those falong with output harmonic content. But normally operating any bridge is (...)
There is a lot article on this regards. And I try to follow there directions. But I stuck with LC filter. Can any one help me on this regards. I enclosed my H-Bridge circuit. I vision is to generate 50~100 Watt Inverter (220V, 50Hz) sine wave ac from a DC 12V battery with SPWM Technique. 112054 I used [URL="ta
Hi, (Please find the data in the pdf file attached). I am simulating a filter in the LTSPICE. The input to the filter is the quantised and sampled version of the sine wave( i generated the wave from data in the MATLAB by my code and I gave the data set to the filter which is 2nd order (...)
Hi Nick. Are you trying to produce a pulse, or a sine wave? Are you converting the PWM output back to analog with a filter? You have two basic controls on a PWM: frequency and duty cycle. Generally with a micro you control these by setting the clock source and frequency, total PWM cycle period (or timer overflow counter in clock (...)
you will get (230 X 1.414) -2 X .8V (voltage drop across the diodes, when off load. As you load it up the voltage will fall and will end up as a DC with a peak voltage of the above but will have a sine wave shape, so the mean DC will be 230V. Frank
how to design a RC lowpass filter in mentor graphics tool. I mean how to apply the sine wave source and values that should be given for transient analysis....
If you add a square wave to a slightly delayed copy of itself, you get a staircase waveform that looks more like a sine wave. Delays up to about a quarter wave would be useul. I don't think this approach can be used if you only have three inverters, so you will need to use an analog filter.
Unless there you don't mind measuring Signal + Noise, the appropriate method is to convert Peak to RMS assuming sine wave and RMS=Peak/Root(2) or 0.707 x Vp as Audioguru stated. If you want to eliminate noise, then a tracking filter is needed.
The 555 output is a square wave that is full of harmonic frequencies, not just one sine wave frequency. You need a bandpass filter for each frequency that is not a simple capacitor. Why not use a touch-tone encoder IC for the transmitter and a touch tone decoder IC for the receiver instead then the frequencies will be (...)
If you consider a bit of RF hash flowing down through a filter capacitor, it arrives at the "neutral" point, then where does it go? Up through the other LPF caps into the other FETS? - they may be off? Also the neutral point is neutral wrt the 50 HZ, not to the PWM carrier, because even if the PWM carrier is exactly timed so each pulse is 12
Did you observe the waveform across a resistor in series with the capacitor? In that case the capacitor acts as a high-pass filter. High frequency noise would show up. I can see a lot of hash just by touching the probe clip. The waveform resembles a rocky mountain, instead of a 60 Hz sine wave. An (...)
This link has an informative article: 'DC/AC Pure sine wave Inverter' It describes designing and constructing one. (This ebook is several MB and may take a while to load. It can be found at more than one website, and it may pay to try a few, if one site bogs down.)
I follow the instruction in Microchip Application Note AN236 to design a simple PLC. I simulate its modules separately to ensure that it works. But when I attach the PWM signal into the power line through a high pass filter, the power signal is still sine wave! (Of course! It's the power source, the voltage can't be changed!) What the thing (...)
Any way about the math... the sine voltage is across the 50 ohm load and with a peak value of 5V so a current of 5/50 = 0.1A is flowing and at resonance we are left only with the the two resistor in series. Definitely not right. If you remove the 50 ohm resistor, the series LC circuit shorts the input source in resonance. The 50 ohm
is there a low pass analog filter for square wave which does not cause ringing effect or conversion to sine wave..... or please say which is best filter for square wave... if so please give the circuit diagram of that filter... What about a lowpass with Thomson-Bessel response?
A 555 will give you a square wave, not a sine wave. I suppose you COULD put a filter on that , but I think you'd be better off just generating a sine wave and amplifying it.
I m designing a pure sine wave inverter of around 2 kVA. Can somebody propose me a sort of filter for switching frequency? Please mention any types!
The easiest solution is to use a low-pass filter to cut harmonics. I am sorry to misread the definition of the problem. To get a sine to square-wave conversion a 10 GHz, I used Hittite HMS 647 fast comparator working up to 12 GHz, maybe you can try it or check Hittite component selection. Generating harmoni
I then need to low pass filter each half sine but I really need to preserve the sharp edges at the bottom where they join. You better describe what you actually want to achieve. After low-pass filtering the rectified sine you either get a pure DC voltage, or a DC voltage with superimposed 100 Hz sine, (...)
nope. Since it is a digital gate, it is expecting a digital input, like a square wave. A square wave would have a strong 15 GHz component also, and you definitely would not want to filter it out. If you are sending it a non-digital input, like a sine wave, and it only happens to have a 2nd harmonic (...)
I agree with Picgak. This design is practical. You should complete it first. To replicate your system front and back of your boards and hex code will be required. I suspect the cause of malfunction is more, the RF interference generated by the inductor rather than any other issue, generated due to improper layout. I found these documnts of your in
A recent thread here discusses an LC filter for a similar sinewave inverter. It is three pages worth and it may have helpful information.
Hello I am trying to make a sine wave inverter. But i am facing a lot of troubles. At the first time i feel it might be easy to generate the sine wave using the controller because i studied that using a low pass filter at the output of the high frequency output of the controller then the square (...)
hi, i have formulated extended kalman filter estimation for a channel with sine wave input. now i want to make the channel rayleigh faded. i need the slow fading case. can anyone please help me with it... Thank you..
Hi, any one know how to design square wave to sine wave with MOSFET? frequency about 20MHz and unity gain if possible. Thanks