Three-Phase AC-DC Converter Parallel Interleaving Control

The patent divides the single-phase PFC circuit into three separate single-phase PFC circuits, each handling one phase of the three-phase input. This segmentation allows each phase to independently process current ripple, reducing the total inductance required compared to a single-phase design handling the same total power. The segmented approach transforms the harmful current ripple into a manageable characteristic at the phase level rather than requiring large filtering inductors at the system level.

The patent changes the operating parameters by introducing phase shifts between the three single-phase PFC circuits. Each phase operates with a different switching phase angle, which transforms the current ripple characteristics. This parameter change allows the ripples from different phases to partially cancel each other out, reducing the overall harmonic content without requiring increased inductance.

The patent segments the DC bus capacitor function across three separate single-phase PFC circuits, each with its own capacitor. This distribution of capacitance function reduces the stress on any single capacitor, allowing smaller capacitors to be used while maintaining the same overall energy buffering capability. The segmented capacitor arrangement reduces the total volume compared to a single large capacitor while achieving lower equivalent series resistance through parallel distribution.

The patent combines the capacitor functions of three separate single-phase PFC circuits to achieve the overall energy buffering function. By merging the capacitive energy storage across three phases with phase-shifted operation, the system achieves reduced RMS current through the capacitors, lowering equivalent series resistance losses without requiring a single large capacitor volume.

The patent segments the heat generation sources into three separate single-phase PFC circuits with distributed capacitors. This segmentation distributes the heat dissipation load across multiple smaller components rather than concentrating it in a single large capacitor. The phase-shifted operation further distributes thermal stress over time, reducing peak temperatures without requiring complex active cooling systems.

The patent enables self-service heat management through phase-shifted operation of three single-phase PFC circuits. The inherent phase differences cause the peak current and heat generation events to be distributed across different time intervals, allowing passive heat dissipation to be more effective. This self-service approach reduces temperature rise without adding complex active cooling mechanisms.

The patent segments the power buffering function across three separate single-phase PFC circuits, each with its own capacitor. This segmentation allows the power balance function to be distributed rather than concentrated in a single large capacitor. The combined effect of three smaller capacitors with phase-shifted operation provides the necessary transient power balance while occupying less total volume, thus maintaining higher power density.

The patent changes the operational parameters by introducing phase shifts between the three single-phase PFC circuits. This parameter change transforms the power transfer characteristics, allowing the pre-stage and post-stage circuits to exchange power more efficiently. The phase-shifted operation reduces the peak current demands on the DC bus capacitor, enabling smaller capacitor volumes while maintaining power balance stability.