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AC-to-DC power converters are widely used in many applications from household appliances to data center server power. Designers of AC-to-DC power converters rely on extensive simulations to verify performance and ensure stability. However, traditional simulations with an AC voltage source at the line frequency can be time-consuming due to the long simulation period required. This work presents the foundation for a technique that replaces the AC source with a DC source (set to the AC source's RMS value) for specific frequency response analyses of the power converter. The findings show that this method yields identical results for control loop and output impedance analysis while reducing simulation time by over 93%, significantly saving both time and computing resources. However, input impedance analysis still requires an AC source for accurate results. This approach enables engineers to accelerate the design process without compromising accuracy, making power electronics simulation more efficient and cost-effective.

More details can be found in: Katherine A. Kim and Thomas G. Wilson Jr., “Simulation Technique and Mathematical Basis for Faster AC Analysis of Power Factor Correction Boost Converters,” IEEE Access, vol. 12, pp. 165130-165142, 2024, doi: 10.1109/ACCESS.2024.3491299.

The first two figures show the frequency response results of the control loop and output impedance measured in simulation using an AC source, which takes minutes to simulate, and a DC source, which takes tens of seconds to simulate. The table summarizes the simulation times for each frequency response measurement of the AC-to-DC power converter. It should be noted that although the input impedance can be simulated with both an AC and DC source, the DC source does not yield the same frequency results, so it is not an applicable approach to reduce simulation time.