Importance

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Abstract

A power transformer for a power converter includes a magnetic core, a primary winding and two serially connected secondary windings. In order to sense the output current to generate therefrom a control signal for controlling a switching of the synchronous rectifiers of the power converter, the power transformer includes an integrated current transformer with a ring-type core and a secondary winding. The primary windings of the current transformer are formed by the end portions of the secondary windings that are fed through the ring-type core. Accordingly, the end portions form a turn of the secondary windings of the main transformer as well as a turn of the primary winding of the current transformer. Accordingly, only one current transformer is needed, which means lower costs and less space required, and the losses due to the wiring to and from the current transformer can be eliminated.

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First Claim