Steady state in one solve
Exact periodic steady state for piecewise-linear switching circuits: no start-up transient to wait through.
Switching converters, straight to steady state.
Draw a schematic or paste a netlist. DC, AC, transient, Bode, and the periodic steady state of a switching converter in one solve, with no start-up transient to wait through.
What does the Circuits & Power Electronics do?
The Circuits & Power Electronics module is a SPICE-style simulator in the browser. It runs DC operating point, AC sweep, transient and Bode analyses, and adds an exact periodic steady-state solve for switching converters: instead of simulating thousands of cycles until the output settles, it computes the steady-state waveform directly. You can draw a schematic or paste a netlist, and it opens existing LTspice .asc schematics. Magnetic parts designed in the Magnetics Designer drop in with their real losses.
Features
Opens LTspice files
Import an existing LTspice .asc schematic and keep working on it in the browser.
DC, AC, transient, Bode
The standard analyses, plus small-signal Bode plots of the switching converter.
Runs anywhere
Mac, Linux, Windows, ARM and Chromebooks: nothing to install.
Limits
Not every LTspice primitive or vendor-encrypted model is supported on import; unsupported parts are reported, not silently dropped.
Every module ships with reference cases that run in our CI. See validation for how results are checked.
Related modules
Conducted-EMI Predictor
Predict the conducted-emission spectrum of a switching converter through a LISN against CISPR 32, CISPR 25 or FCC Part 15.107 limits, with DM/CM split, peak, quasi-peak and average detectors, margin and a first filter.
Loop & Stability Designer
Loop gain of a switching converter on the exact switching model: gain and phase margin, Floquet stability verdict, subharmonic map for peak current mode, and compensator auto-tune.
Converter Designer
From input and output specs to candidate converter topologies, real parts and an efficiency, volume and cost Pareto front with error bands, each design verified by an exact steady-state simulation.
Try the Circuits & Power Electronics.
Frequently asked questions
Can I open LTspice .asc files?
Yes. The Circuits module imports LTspice .asc schematics. Parts it cannot map are listed so you can replace them.
What does exact switching steady state mean?
For a switching converter the simulator solves for the periodic waveform directly rather than running a long transient until the circuit settles, so efficiency and ripple are available in one solve.
Does it run on a Mac?
Yes. It runs in any modern browser, and there is a desktop app for macOS, Windows and Linux.