Soft Switching on all switching elements Converter through Current Shaping "Bucharest Converter"

摘要

A method is shown to create soft transition in selected topologies by controlling and designing a current pulse injection in front of the output choke to overwhelm the output current at a certain point in the switching cycle.

主权项

1. A design and control method for a converter having a transformer and one output choke, at least two primary switching devices and at least two synchronous rectifiers in the secondary, wherein each of the primary switching devices is off when its correspondent synchronous rectifier is on, wherein the converter is designed so that an additional current source inject a pulse of current in front the output choke so that the current exceeds the current through the output choke at its lowest point so that the current through each of the synchronous rectifier becomes zero or negative prior the turn off of the said synchronous rectifier and that said synchronous rectifier is turned off prior to the turn on of its correspondent primary switching device.