LTSpice DC - AC Inverter Schematic Help

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SUMMARY

This discussion focuses on creating a DC-AC inverter circuit using LTSpice, specifically aiming for a pure sine wave output. Participants emphasize that a digital switching design typically produces a square wave, necessitating a different circuit topology for sine wave generation. The main oscillator in the proposed circuit is identified as an astable multivibrator. The conversation also touches on the importance of understanding AC mains circuits and safety considerations for those intending to build and test the circuit.

PREREQUISITES
  • Understanding of LTSpice simulation software
  • Knowledge of astable multivibrators and their operation
  • Familiarity with DC-AC inverter circuit design
  • Basic principles of AC mains circuits and safety protocols
NEXT STEPS
  • Research different circuit topologies for generating pure sine waves
  • Learn about the operation and design of astable multivibrators
  • Explore LTSpice simulation techniques for inverter circuits
  • Study AC mains safety standards and best practices
USEFUL FOR

Electrical engineering students, hobbyists designing inverter circuits, and professionals working on EV charging solutions will benefit from this discussion.

NightStar
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Hi, I'm looking to understand a circuit schematic on LTSpice. I'm trying to make my own DC-Ac Inverter circuit and am a bit lost, so am looking through the forums to find inspiration. I found the schematic below from an older forum post and am struggling to comprehend it. In an inverter circuit. I'm looking to make a pure sine wave.
Screenshot 2025-04-09 011516.png
 

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Welcome to PF.

Everything is digital and switching, so the output will be a square wave, not a sine wave.
You will need a different circuit topology to generate a sine wave.
What exactly do you not understand about the circuit ?
 
The main oscillator is an astable multivibrator. Try this link to understand how it works.
 
NightStar said:
I'm trying to make my own DC-Ac Inverter circuit
Is your aim to just understand a circuit and get a good LTSpice simulation running, or do you intend to actually build and test the circuit? If the latter, what experience do you have with AC Mains circuits and the related safety considerations?
 
berkeman said:
Is your aim to just understand a circuit and get a good LTSpice simulation running, or do you intend to actually build and test the circuit? If the latter, what experience do you have with AC Mains circuits and the related safety considerations?
I'm a student working on a research project with an Electrical Engineering professor focused on EV Charging adapters. I'm trying to convert power from an NACS charger to be compatible with a J1772 charging port. I'm trying to simulate an inverter circuit to get a better understandinng of circuits as a whole.
 

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