Linked Questions

-1
votes
4answers
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 ...
2
votes
1answer
5k 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(...
0
votes
2answers
289 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?) ...
0
votes
3answers
464 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 ...
1
vote
1answer
328 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 ...
-1
votes
1answer
277 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 ...
2
votes
1answer
231 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 ...
1
vote
1answer
226 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 ...
0
votes
2answers
122 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 ...
0
votes
1answer
171 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 ...
2
votes
1answer
189 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 ...
0
votes
1answer
162 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 ...
0
votes
1answer
76 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 ...
0
votes
1answer
87 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 ...
1
vote
2answers
98 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 ...

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