There is one more thing that puzzles me: in one of the comments, someone suggests using current sources instead of optocouplers, and you say you tried. This makes me think accuracy, or keeping to a quasi-real setup, is not that important to you, which means you could simplify theLC filter after V5 into it's simple LC lowpass (i.e. don't make it a symmetric filter), but the biggest simplification can be done to the whole bridge and its control circuitry: you can simply use some G (or E) sources driving the native switch SW. The SW may need some anti-parallel diodes. Speaking of which, you can also replace the diodes with the idealized version, having .model D D Vfwd=0.7 Vrev=1k Ron=0.1 Roff=10Meg epsilon=100m revepsilon=50m, or Vfwd=0.5 for Shottky. I see two anti-parallel diodes, those could be replaced by only one diode with Vfwd=Vrev. Zeners also with Vrev=X. Of course, all these imply using an idealized, or a behavioural approach to all your schematic and, while it's very plausible and used for quick tests, you should not forget that the downside is the unrealistic results, even when modeled with great care. You could get good results, but they shouldn't be relied on, as even a schematic made with "real" elements is only a SPICE simulation using models that, themselves, are approximation of real-life cases. Of course, ultimately, it falls on you to choose your way.

Agreed also that Mike has done a great job with LTSpice, and while I might complain here and there, it is my go-to circuit simulation tool for many years. In fact, I had a chance to talk to him directly at PCIM, and see him demostrate the new simulation tool. It looks very nice and quite fast, and the handling of digital code looks extremely fast, well thought out, relatively simple to use, and seamlessly integrated with analog simulation. Of course, the real test will be when I simulate my circuits on it.

Ltspice Simulation Free Download

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LTspice is a powerful piece software designed to revolutionize the realm of switching regulators and analog circuits. This ingenious platform offers an extensive assortment of components, empowering you to weave them seamlessly into your intricate designs.Tailored for the eager minds of students and the seasoned expertise of professional electronics engineers, LTspice is poised to propel your creative ventures in devising anything from the simplest of switching regulators to the most elaborate circuit simulations.Harness the full potential of this remarkable SPICE circuit simulator as you craft, test, and refine your very own integrated circuit schematics.Includes a vast variety of different components for your diagramsBoasting an impressive content library, LTspice presents you with a diverse collection of pre-defined components, ripe for inclusion in your circuits. From resistors, capacitors, inductors, and diodes to wires, BUS taps, text boxes, and labels, the possibilities are virtually endless. Moreover, the integrated drawing tools allow you to incorporate a rich array of geometric figures and shapes, elevating the complexity of your final design.Taking meticulous care in configuring the flow of current, each individual component can be fine-tuned with a simple right-click. Adjust the resistance, tolerance level, and power rating of a resistor, or modify the functions, parasitic properties, and amplitude of a voltage source. Even MOSFET components can be woven into your design, displaying their configuration without the need for internal nodes - expediting computation time without compromising the switching waveforms.Compile and simulate your designs in LTspiceAs you complete your masterful scheme, LTspice's built-in compiler and simulator stand ready to assess its validity. Capable of simulating complex switched-mode power supply systems, LTspice ascertains the presence of energy dissipation and determines whether energy waste is minimized. With a mere click, LTspice can generate a bill of materials for your circuit and produce a comprehensive efficiency report.Providing the ultimate proving ground, LTspice empowers you to model switching regulators and electrical circuits, as well as conduct simulations before constructing the actual electronic components. The SPICE-like component models ensure precise results for nonlinear designs, while the sophisticated simulation capabilities enable you to evaluate a circuit's functionality.Our viewIn conclusion, LTspice offers an unparalleled, secure environment for designing and testing your electrical circuits. Swiftly acquaint yourself with its diverse features and revel in the limitless potential of the vast array of components at your disposal. Let your creativity soar as you explore the boundless horizons of circuit design and simulation.Features of LTspiceAnalysis: Advanced analysis capabilities, including DC sweep, AC sweep, transient analysis and noise analysis.Behavioral modeling: Support for behavioral modeling, allowing the user to create custom models for components.Circuit simulation: The ability to simulate circuits with non-linear elements, such as transistors and diodes.Components: A wide range of analog and digital components, including transistors, diodes, op-amps and digital gates.Import and Export data: You can import and export schematics in a variety of formats, including SPICE netlists.Interface: User-friendly interface for creating and editing circuit diagrams.Useful examples and learning resources: A library of example circuits and models for users to learn from and use as a starting point for their own designs.Waveform viewer: Built-in waveform viewer for analyzing simulation results.Compatibility and LicenseLTspice is provided under a freeware license on Windows from educational software with no restrictions on usage. Download and installation of this PC software is free and 24.0.12 is the latest version last time we checked.

I am using Python 3 and LTSpice to explore the design space of a circuit. The netlist is specified using Python and LTSpice is ran in the background to solve it.I need to run LTSpice more than 1000 times and the simulations take several hours. However, for most of the cases, I know that if certain conditions are achieved the simulation can be stopped and the simulation time can be decreased significantly. LTSpice only allows a fix Stop simulation.

There could be a few reasons for this issue. First, check if you have properly connected the input and feedback resistors. Also, make sure that the input signal is within the linear range of the op-amp. Additionally, check if the op-amp is powered correctly and that the simulation time is long enough for the output to reach a steady state.

This could be due to incorrect component values or incorrect op-amp model. Check if you have used the correct values for the resistors and capacitors in your circuit. Additionally, make sure that the op-amp model you are using accurately represents the real-world behavior of the op-amp. If the problem persists, try using a different op-amp model or adjusting the simulation settings.

On this example, Qspice runs quite faster, with Total elapsed time: 0.100831 seconds., while LTspice needs Total elapsed time: 0.510 seconds (mean times, default settings for both programs).

Furthermore, LTspice speed is not repeatable, sometimes needing quite a longer time (Total elapsed time: 1.161 seconds.) for the same simulation (not understood when and why, just rerunning the same simulation). Qspice is instead almost deterministic, with < 50 ms variability.

Simulation esults are almost identical.

Let notice that both simulators cannot give reasonable results without specifying the Maximum Timestep, showing the same type and amount of error.

(Win10 ent, i5-6300HQ CPU @ 2.30GHz, 2301 Mhz, 4 cores, 16 GB RAM)

I started spice simulation from Pspice when I was in university. After I started my career, our CTO introduced LTspice to me and I have been using it since 2010. LTspice was the most important tool in my career and study in electronics. Whenever I train a junior engineer, I encourage him/her to learn LTspice.

The simulation is still less than lightning fast due to the number of switch cycles required to throw away before steady state is reached, and due to the fact that effectively five different simulations are done at the different load currents, but when it does finally finish (my PC took about 30 minutes to finish), the results can be plotted as shown below.

The bottom plot simply acts as a color key for the load currents that were simulated. The output voltage is shown (with a long enough timescale to show plenty of switch cycles) to verify that steady state has been reached for each load current. The top plot of V(pout)/V(pin) are the efficiencies at the various load currents. If the simulation was run much longer the ripple in the efficiencies would become less and less, but this is sufficient to be able to clearly see the average values that are being converged on, and extending the simulation period of course extends the simulation time.

So, it can be seen that at the lightest load of 50 mA (green line), the efficiency is about 80%. The efficiency increases and peaks at almost 87% at the 200 mA (light blue line) value that was simulated, but then begins to drop of slightly again at the final 250 mA (purple line) full load. These techniques should be applicable to any switching supply you wish to simulate in LTspice, even those with multiple output windings as long as you add all the output energies, and as long as you can find ways to practically limit the necessary simulation time like in the example above.

The first form is the traditional .tran SPICE command. Tstep is the plotting increment for the waveforms but is also used as an initial step-size guess. LTspice uses waveform compression, so this parameter is of little value and can be omitted or set to zero. Tstop is the duration of the simulation. Transient analyses always start at time equal to zero. However, if Tstart is specified, the waveform data between zero and Tstart is not saved. This is a means of managing the size of waveform files by allowing startup transients to be ignored. The final parameter dTmax, is the maximum time step to take while integrating the circuit equations. If Tstart or dTmax is specified, Tstep must be specified. 0852c4b9a8

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