Trennender Gleichstrom/Gleichstrom-Umrichter

摘要

The converter has a main transformer (4) with main switching element (2) on the primary side, and a synchronous rectifier (6) and associated drive circuit (30) on the secondary side. The main switching element is turn ON of OFF by charging and discharging a input capacitance by a control pulse. The synchronous rectifier is turned OFF by synchronization to the turn-on of the main switching element. The turn on of the main switching element and the turn off of the synchronous rectifier are synchronized. The turn ON/OFF of the main switching element allows energy to be coupled from the primary side circuit to the secondary side circuit rectifying and smoothing circuit, so that a DC voltage is outputted. There is a drive transformer (11) with a primary side connected to a charging path for the input capacitance. There is also an early-off drive circuit for the synchronous rectifier, located on a secondary side of the drive transformer. This turns off the synchronous rectifier before the input capacitance is charged to turn on the main switching element, when the main switching element is provided with the control pulse by using a secondary side output from the drive transformer.