Unsynchronized DC-DC Converters for Stable Output Voltage

The patent applies periodic action by operating multiple DC-DC converters at different switching frequencies (e.g., first converter at frequency f, second converter at frequency 2f or 3f). This creates a hierarchical periodic structure where the faster converter operates in a sub-harmonic relationship with the slower converter, allowing both to contribute to current supply while maintaining voltage stability through frequency differentiation rather than synchronization.

The patent implements self-service by designing a control mechanism where each converter automatically adjusts its operation based on feedback from the common output voltage. The control circuit monitors the output voltage and autonomously modulates the switching duty cycles of individual converters without requiring external synchronization signals or complex coordination logic between converters, thereby maintaining stability while minimizing added complexity.

The patent segments the switching operation into multiple hierarchical levels by using converters operating at different frequencies. The slower converter provides coarse-grained power delivery with larger switching periods, while the faster converter provides fine-grained adjustments with smaller switching periods. This segmentation allows the system to respond quickly to load changes through the faster converter without the oscillation issues that would result from a single high-frequency converter, as the slower converter's larger time constants naturally filter high-frequency oscillations.