Isolated Power Module

An Isolated power module (with an integrated transformer) is a standardized, self-contained power supply unit that integrates power conversion circuitry, control and protection circuits, and an isolation transformer into a single package. Its core feature is the use of an integrated transformer to achieve electrical isolation between the input and output sides. This product differs from discrete designs-which require the separate procurement and assembly of transformers-and is fundamentally distinct from non-isolated power modules in terms of safety and performance. This integrated design eliminates the need for the complex steps typically involved in traditional power supply development, such as transformer selection, winding, and safety certification.

Electrical isolation is the primary function of these modules: energy is transferred via magnetic coupling through the transformer, breaking the DC path between input and output. This blocks common-mode interference, protects downstream low-voltage circuitry, ensures operator safety, and meets mandatory safety standards regarding isolation voltage and creepage distance. The advantage of this integrated design lies in the fact that the module manufacturer has already optimized the matching between the transformer and the circuitry. This resolves common issues found in discrete designs-such as excessive transformer leakage inductance, excessive EMI, and low efficiency-while simultaneously reducing the PCB footprint and simplifying the production process.