1. A

    Three-phase EMI filter. LTspice

    Hello. Could you help me understand how to create a three-phase EMI filter? For example, I chose a full-bridge inverter with parameters P = 100kW, f_switch = 100 kHz. The noise measurement is performed using the LISN. The results of the simulation (calculation time 0-50ms) In this graph...
  2. T

    Could not understand why noise cancellation must be at (fs-fc) for -60dB

    I have the overview of signal with cut-off frequency fc that I want to sample using an ADC with sampling frequency of fs, I have seen that some of my colleagues wanted to dumb any noise at -60dB at frequency fs-fc as you see it in the picture. for my understanding of nyquist theorem, I need to...
  3. C

    Using audio LC filter circuits instead of RC.

    I'm designing a small mixer and stopped at the equalizer section when I recalled the number of small inductors (axial and SMD) in my parts kit. If you search 'filter circuits' or similar you'll ALWAYS get the standard RC topologies, and I'm thinking more of IC feedback types than the usual...
  4. P

    Finding the Size of Inductor and Capacitor

    Hi, i have calculated the L and C value for filter circuit for Three phase inverter, now i would like to know the size and weight of the filter circuit for the L and C value i have calculated. Can anyone help me on how to do this ? Thank you. Raj
  5. S

    8th order sallen-key butterworth lowpass filter

    Hi guys, I'm running into some problems designing a 10MHz 8th order sallen-key butterworth lowpass filter. My requirements are: cornerfrequency f_c = 10 MHz max passband gain of 0.5dB filterorder of 8 available components: resistors, capacitors, op-amps What I have tried so far: I found...
  6. Nurahmed Omar

    Frequency Response of LC Filter has a Peak with an Impedance Load

    Hi, I am designing an LC filter with a cut-off frequency of 20 kHz for the Class-D amplifier. The filter schematic is shown in Fig.1 top right. I understand how to choose the LC values for the critically damped case for the pure resistive load as shown in Fig. 2. The problem is I want to drive...
  7. Sphades

    I need help with a LED Organ circuit.

    Hello guys! This is my first post here, so I'm sorry if I break any rules or anything. I'd need some help with an LED Organ circuit. This is the design I came up with: It's just a crossover circuit connected to 3 transistors that are supposed to pull the LED's low. Problem is that it is not...
  8. Sudip Mandal 2

    Interfacing circuit for Piezoelectric vibration sensor to detect shock

    I want to detect the mechanical shock of a machine. To measure the vibrational shock I am using Minisense 100 Piezoelectric vibration sensor. I have done the feasibility test using it and it is giving output as expected. I have observed on the oscilloscope output frequency for all type...
  9. calmd

    LCL Filter Plant Control

    Hi everyone! I don't know if this is the place to ask Control Theory related questions, but it's for modelling a power electronics circuit so I thought I could at least try. I have to design a grid connected inverter in Simulink using the PLECS toolbox and I ran into some problems when designing...