LTSpice DC - AC Inverter Schematic Help

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Discussion Overview

The discussion revolves around understanding a circuit schematic for a DC-AC inverter in LTSpice. Participants are exploring the design and functionality of inverter circuits, particularly focusing on generating a pure sine wave output.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification
  • Homework-related

Main Points Raised

  • One participant expresses confusion about a specific inverter circuit schematic found in a forum and seeks guidance to create a pure sine wave output.
  • Another participant notes that the output of a digital and switching inverter will be a square wave, suggesting that a different circuit topology is needed to achieve a sine wave output.
  • A participant identifies the main oscillator in the circuit as an astable multivibrator and provides a link for further understanding.
  • There are questions regarding the participant's intentions: whether they aim to understand the circuit for simulation purposes or if they plan to build and test the circuit, with a focus on safety considerations related to AC mains circuits.
  • A later reply reveals that the original poster is a student working on a research project related to EV charging, indicating a practical application for their inquiry into inverter circuits.

Areas of Agreement / Disagreement

Participants have not reached a consensus. There are differing views on the output characteristics of the inverter circuit, with some emphasizing the need for a different approach to achieve a sine wave output while others focus on understanding the existing schematic.

Contextual Notes

Limitations include the lack of clarity on specific components within the schematic and the assumptions regarding the participant's prior knowledge of AC mains safety considerations. The discussion does not resolve the technical details of the inverter design.

Who May Find This Useful

This discussion may be useful for students and hobbyists interested in circuit design, particularly those working with inverter circuits and simulations in LTSpice.

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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