LTspice, SMPS power supply circuits.

This page has links for several SMPS power supply circuits for operation on LTspice. the categories covered include, ..............

The first section gives a simple overview of the three simplest SMPS topologies, that is the Buck, the Boost, and the flyback.
There are other more complex topologies such as the Cuk, the Sepic, the buck-boost, and the Weinberg, but I will start with the simple topologies.
The next three sections, buck as a linear reg replacement, the halfbridge, and the fullbridge, show variations of the buck topology.
The next section shows the boost topology used for power factor correction (PFC).

The SMPS circuits as a ZIP file.

In case if difficulty downloading here are the contents of this section as a ZIP file.

The three simple SMPS topologies, Buck, Boost, and flyback.

The buck SMPS circuit in its simplest form. (circuit)

Description and analysis for the buck.(text)

The boost SMPS circuit in its simplest form.(circuit)

Description and analysis for the boost.(text)

The flyback SMPS circuit in its simplest form.(circuit)

More description and analysis for the flyback.(text)

A more complete flyback circuit.

I have been lazy here as Analog Devices provide simulation models and example circuits in LTspice for some of their flyback control ICs.
In LTspice click on /file/open examples/applications...
then in the window that opens, in the search box on the top right enter "ADP1071-1" and click okay.
in the circuit that opens click on run,
Plot Vin and Vout in the plot window, then do /plot settings/add plot pane, and plot the two FET drive waveforms "gate" and "SR", then do /plot settings/add plot pane, and click on L1 and L2 to plot their currents.
This is a sophisticated IC with many features, plot the other waveforms and read the datasheet if you are interested.

The buck SMPS as a linear regulator replacement.

The first circuit here puts a closed loop around the above "buck topology in its simplest form".
The next circuit does the control loop frequency response, often called a bode plot
The next circuit uses a real control IC.

A halfbridge SMPS circuit

A fullbridge SMPS circuit with phase shift control.

7p_full_bridge_phase_shift_closed loop.asc

7p_full_bridge_phase_shift_loop_response.asc

A general discussion of input stages, PFC, harmonics and EMI

PFC (power factor correction) with continuous inductor current UC2854.

A resonant SMPS.

the reason for using a resonant SMPS in amateur radio could be reduced emi from switching edges rather than a need for higher freq operation.
There are lots of different types of resonant power supplies but I have started with just one type.
you could call it half cycle, series loaded, discontinuous, operating below resonance.
I have based the power supply on the half bridge topology, I could have started with the full bridge topology, or several other topologies instead.
As you can see taking all the permutations of the various types of resonant mode power supplies I have described, there are as many types of resonant power supplies as there are companies selling resonant power supplies.
I have used this respnant power supply with the output filter removed as a power amplifier in the "Class D power amps" section.