Ericsson Gmbh

Claes Svardsjo

Richard W Farrington

William Hart

The present invention provides a method for preventing a fault condition in a DC-DC converter ( ) having a first secondary winding (Ns ) coupled to a first synchronous rectifier (SQ ) and a second secondary winding (Ns ) coupled to a second synchronous rectifier (SQ ). The first synchronous rectifier (SQ ) is turned on based on a voltage across the first secondary winding (Ns ) and is turned off based on a first driver signal. The second synchronous rectifier (SQ ) is turned on based on a voltage across the second secondary winding (Ns ) and is turned off based on a second driver signal. The present invention also provides a DC-DC converter ( ) wherein a first control circuit is coupled to and controls the first synchronous rectifier (SQ ) pursuant to the method described above, and a second control circuit is coupled to and controls the second synchronous rectifier (SQ ) pursuant to the method described above.

Method of connecting synchronous rectifier modules in parallel without output voltage faults

A self-driven synchronous rectifier circuit (,) for a DC&mdash;DC power converter. The circuit comprises a primary transformer (,), a first synchronous rectifier (SQ,) coupled to the primary transformer (,), a second synchronous rectifier (SQ,) coupled to the primary transformer (,), an external drive circuit (,). The circuit (,) also comprises a plurality of switches (SQ,, SQ,) controllably coupled to second synchronous rectifier (SQ,). The external drive circuit (,) provides turn-off signaling for both synchronous rectifiers (SQ,, SQ,) Turn-on signaling provided for first synchronous rectifier (SQ,) by the primary transformer (,) turn-on signaling for second synchronous rectifier (SQ,) is provided by the external drive circuit (,).

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Richardson, TX, United States of America

Claes Svardsjo