Capacitor Insulated DC-DC Converter Asymmetric Grounding

The patent applies asymmetry by connecting only one terminal of the capacitor to the GND potential, rather than symmetrically connecting both terminals or leaving both floating. This asymmetric grounding configuration allows the capacitor to provide insulation while enabling controlled current paths that prevent noise generation. The asymmetric connection creates a reference potential that stabilizes the circuit operation and prevents the unbalanced current flow that would otherwise occur with different grounding configurations.

The patent changes the grounding parameter from traditional symmetric grounding (both terminals connected to GND) or floating configuration to asymmetric grounding (one terminal connected to GND). This parameter change fundamentally alters the current flow characteristics, transforming the capacitor from a noise-generating component into a noise-suppressing element while maintaining its insulation function.

The patent extracts the insulation function from the traditional transformer and implements it using a capacitor with asymmetric grounding. By taking out the core insulation requirement and implementing it through a different component (capacitor instead of transformer) with a novel grounding configuration, the patent achieves the same EMI protection function with significantly reduced size, weight, and cost.

The patent substitutes the magnetic field-based insulation mechanism of transformers with an electric field-based insulation mechanism using capacitors. This substitution, combined with asymmetric grounding, replaces the heavy magnetic core and windings with lightweight capacitor structures, achieving comparable or superior EMI performance with dramatically reduced physical dimensions and weight.