25 questions linked to/from How to fix this LTspice error
2k views

### What H-Bridge principles am I missing in the circuit [closed]

I thought that an H-Bridge was simple enough to put together. So I loaded LTSPICE and made a sqaure wave with 4 voltage sources, 180 degrees out of phase and fed each oposing corer a signal ...
6k views

### 3-Phase Inverter simulation

I'm trying to simulate a 3-phase inverter for BLDC(PMSM) in LTSpice. The problem is that drain current is way too high and also phase voltage isn't right. **New image *One leg If I put one source(...
338 views

### How filterless Class-D amplifier works?

The image below shows how a Filterless Class-D amplifier works: The way I understand it: Vout(minus) is just the mirror image of the Vout(plus) but there was a certain phase shift(time delay?) ...
520 views

### Modelling a low-pass filter on LTSpice to filter an input square wave at 50kHz to obtain a sinusoidal output at 50Hz

I'm trying to create a filter that filters the output of an inverter at 50kHz PWM (from reading the comments, I'm not sure if I should be calling this the switching freq?) to a sinusoidal one at 50Hz ...
363 views

### Help with LTspice inverter simulation

I am trying to simulate a basic inverter circuit in LTspice. For some reason I am unable to obtain 48V peak to peak across the resistor R1 which only shows about 6Vp-p (indicated by the blue square ...
334 views

### three phase inverter design in ltspice

I have designed three phase inverter in ltspice with SPWM technique using mosfet switch. the output voltage at the load is incorrect. could anyone please tell me what is wrong in the simulation to get ...
253 views

### LTspice simulation, timestep too small error

I already received a few tips from user 'a concerned citizen', but decided to start a separate question. This is the schematic: This simulation takes about 1:10 to complete the first 8.6 ms on a ...
234 views

### Isolated three level pwm LTSPICE

I am doing a simulation on LTSpice of a three level ANPC. The ground is connected to the neutral point (i.e in the middle point of the DC input) and the gate drivers are isolated by using a DC DC ...
124 views

### Circuit Gives DC Current instead of Sine signal (LTspice XVII)

I'm a mathematics and physics student. I am trying to simulate the circuit from the paper "Design and implementation of a lightweight high-voltage power converter for electro-aerodynamic ...
185 views

### Maximum AND minimum duty cycle in SPICE converter simulation

I am modeling a Push-Pull Converter in LTSpice and implemented this for a simple voltage feedback PWM control. This works great and I have added a bit on the end that allows for a maximum duty cycle ...
206 views

### Having trouble properly driving a MOSFET

I'm trying to build a pure sine wave inverter in LTspice (Image 1) but I'm running into some trouble. So far, it consists of three main parts: The SPWM generator generates an SPWM signal from a 200kHz ...
114 views

### Set parameter from voltage output (LTspice)

I have PULSE(0 123 0 0.0000001 0.0000001 0.0000333 0.0000666) and I want to change the sixth parameter according to a voltage source output. I need to alter the parameter to make sine wave. How could ...
179 views

### I'm trying to build an inverter circuit in LTspice using voltage controlled switches

I'm trying to build a H-bridge inverter circuit on LTspice, but I'm having trouble with getting a correct waveform. The upper and lower switches do not appear to be in sync (i'm not getting a complete ...
107 views

### h bridge motor circuit on LT specie

I've been working on a project where i'm building a h bridge motor circuit i have easily spent 15 hours on it and have made extremely slow progress on it in the last 3 days. The project sheet is seen ...
104 views

### LTspice Half bridge inverter ringing and current spikes

I'm trying to build a pure sine wave inverter in LTspice but I'm having some trouble. This is a test circuit, the voltage source outputs an SPWM signal which becomes a perfect sinewave after passing ...
101 views

### Excessive current in this inverter design

I made this inverter with Proteus. The phases have no load at all, but the input current is very high (red arrow.) This happens only when capacitors marked by the green arrows are connected. They ...
77 views

### SMPS Simulation Help

Finally bit the bullet and considered getting help with a simulation I'm looking to get right. Just a heads up, I have limited experience with SMPS simulation in both LTSpice and Multisim. The circuit ...
86 views

### H-bridge produces square wave output under heavy inductive load instead of sine wave

I was Following this tutorial to make H-Bridge. I have first did some simulation and the following image shows the same. I don't have schematic because I directly made the circuit by hand based of ...
50 views

### Diode-clamped five-level inverter simulation with PSpice

I am working on a diode-clamped five-level inverter simulation with PSpice, but I am unable to get the right results. I have done a simulation with Simulink and I can get the correct result which ...
64 views

### Three-phase inverter simulation - incorrect result

while simulating a three-phase inverter circuit with a three-phase load circuit. the simulation result seems incorrect. here is my circuit and simulation result. the input voltage is 300v the output ...
40 views

### How to create timing waveforms for an H-Bridge Inverter

This is my first question on Stack Exchange. I am in the process of simulating a wireless charger coil setup on LTSpice. I have tried a Royer/Baxandall oscillator to provide the necessary sinusoidal ...
38 views

### Why my gate driver output has spikes?

I am doing a sound amplifier using LTspice and I would like to know if someone know why my gate driver output has spikes only when it is connected to the half-bridge circuit. The INP terminal is ...
32 views

### Issue with H-Bridge simulation waveform

I've built a simple H-bridge circuit with LTSpice: DirSigA (blue), DirSigB (red) and Vout (green) waveforms: DirSig A and B are both pulse signals with a Vmax of 5v. I've been tinkering with the ...