Simplified implementation of parallelability for modules with synchronous rectification

A DC-DC converter comprising:

• a primary transformer having a primary winding, a first secondary winding and a second secondary winding, the first and second secondary windings coupled together;
• a first synchronous rectifier coupled to the first secondary winding;
• a second synchronous rectifier coupled to the second secondary winding;
• a first control circuit coupled to the first synchronous rectifier, the first control circuit turning the first synchronous rectifier on based on a voltage across the first secondary winding and turning the first synchronous rectifier off based on a first driver signal;
• and
• a second control circuit coupled to the second synchronous rectifier, the second control circuit turning the second synchronous rectifier on based on a voltage across the second secondary winding and turning the second synchronous rectifier off based on a second driver signal.

A DC-DC converter comprising:

• a power transformer having a primary winding, a first secondary winding and a second secondary winding, the first and second secondary windings coupled together;
• a signal transformer having a primary winding, a first secondary winding and a second secondary winding, the first and second secondary windings coupled together;
• a first and second output terminal, the second output terminal coupled to the connection between the first and second secondary windings of the signal transformer;
• an output inductor coupled between the connection between the first and second secondary windings of the power transformer and the first output terminal.
• an output capacitor coupled between the first and second output terminals;
• a biasing voltage terminal;
• a first synchronous rectifier coupled between the first secondary winding of the primary transformer and the second output terminal;
• a first switch coupled between the biasing voltage terminal and a control of the first synchronous rectifier, a control of the first switch coupled to the first secondary winding of the primary transformer;
• a second switch coupled between the control of the first synchronous rectifier and the second output terminal, a control of the second switch coupled to the first secondary winding of the signal transformer;
• a second synchronous rectifier coupled between the second secondary winding of the primary transformer and the second output terminal;
• a third switch coupled between the biasing voltage terminal and a control of the second synchronous rectifier, the control for the third switch coupled to the second secondary winding of the primary transformer;
• and
• a fourth switch coupled between the control of the second synchronous rectifier and the second output terminal, the control for the fourth switch coupled to the second secondary winding of signal transformer.