LAGUNA, PHILLIPPINES – IMI and its subsidiary Speedy-Tech Electronics have obtained in a US patent describing a self-coupled driver used in dual-switch forward power converter.

A dual-switch forward power converter, and a method of operating the same, employs a self-coupled driver to achieve higher efficiency, lower part count and component cost.

The transformer has two serially connected primary windings, with the first winding connected to a first switching transistor, which is biased by a pulse controller; the second winding couples the voltage across the first winding to bias the second switching transistor.

The circuit on the primary side of the transformer comprises means of dissipating magnetization current, and the circuit on the secondary side comprises a rectifier and a low-pass filter.

The US Patent no. is 7787265.