Flyback Converter Synchronous Rectifier Gate Control

The patent applies preliminary action by implementing a delay mechanism that temporarily disables the synchronous rectifier controller upon activation. This delay allows the controller to synchronize with the primary side switching frequency before becoming operational, preventing mis-synchronization and shoot-through events while still enabling power loss reduction during light-load conditions

The patent uses an intermediary approach by introducing a delay mechanism that mediates between the synchronous rectifier controller and the ringing signal. Instead of directly synchronizing with the harmful ringing, the delay mechanism allows the controller to wait for proper synchronization timing, thereby avoiding amplification of ringing while achieving accurate synchronization with the primary side

The patent applies preliminary anti-action by implementing a delay mechanism that proactively prevents the harmful condition before it can occur. The delay temporarily disables the synchronous rectifier controller upon activation, preventing the secondary MOSFET from turning on during primary MOSFET conduction, thereby avoiding transformer saturation and high current damage before these issues can manifest