Hi,
Pulse skipping modulation (PSM) is a modulation technique used for power converters that improves efficiency by reducing switching losses at light load conditions. In PSM, the power switch is turned on and off only when it is necessary to maintain output voltage regulation, resulting in fewer switching cycles and lower switching losses.
To implement PSM in MATLAB Simulink for a 4-switch buck-boost converter, you could follow these steps:
1. Open a new Simulink model and add a 4-switch buck-boost converter block.
2. To switch between PFM and PSM, you could use a duty cycle controller that adjusts the duty cycle based on the output voltage, current, or other relevant parameters. In the case of PSM, the duty cycle should be decreased at light load conditions to reduce the number of switching cycles.
3. Implement PSM by using a Pulse Skipping Modulator block from the Power Electronics Blockset library. This block generates a binary control signal that is fed to the power switch to determine when the switch should be turned on and off.
4. When using PSM, you may also need to add a filter to smooth the output current and avoid current ripple. You could use an LC filter or a simple low-pass filter depending on your specific application requirements.
5. To switch between PSM and PWM, you could use a switch block in the Simulink model that selects the appropriate modulation technique based on the duty cycle or other relevant parameters.
6. Finally, you can run the simulation to observe the output waveforms and tune the controller parameters to achieve the desired performance.
Note that the specific implementation details will depend on your specific requirements and the characteristics of your system. You may need to try different filter configurations to achieve the desired performance, or adjust the parameters of the PSM block or the duty cycle controller.
