Transformer-Isolated Power Supply Circuit for Low-Cost Signal Transfer

The patent introduces a transformer as an intermediary device between the primary and secondary circuit systems. The transformer provides galvanic isolation through magnetic coupling, eliminating the need for direct high-voltage isolation processes in the semiconductor manufacturing. This mediator approach maintains electrical isolation reliability while using standard low-to-mid-withstand-voltage fabrication processes.

The patent replaces electrical isolation mechanisms (which would require high-withstand-voltage processes) with magnetic isolation through transformers. By substituting the isolation mechanism from electrical field-based to magnetic field-based, the system achieves the same isolation effect using conventional semiconductor manufacturing processes.

The patent integrates the transformer directly into the semiconductor device package, nesting multiple functional components (controller, driver, transformer) within a single integrated unit. This integration minimizes parasitic inductances and capacitances, improving signal transmission efficiency while maintaining the cost benefits of standardized manufacturing processes.

The patent employs planar spiral coil structures for the transformer windings, transitioning from traditional three-dimensional wound coils to two-dimensional planar configurations. This dimensional change reduces parasitic effects, improves coupling efficiency, and enables compatibility with standard semiconductor fabrication processes while maintaining signal transmission performance.