METHOD FOR DRIVING INVERTERS, AND INVERTER ADAPTED TO REDUCE SWITCHING LOSSES

摘要

A method for controlling the switching of an inverter (1), a bridge (2) of which is adapted to chop a voltage from a direct voltage source (4) for feeding a chopped voltage to a primary (L1) of a transformer (5); the inverter. (1) comprises a diode rectifier circuit (6) receiving the input voltage from the secondary (L2) of the transformer (5) in order to achieve a voltage fed to a chopper (7) which feeds a load (M). The method comprises : a step in which the switches of the bridge (2) are driven so that the power source (4) is disconnected from the primary (L1), the terminals of which are connected to each other by at least two of the electronic switches and recirculation diodes of the bridge itself, so that the voltage present on the secondary (L2) of said transformer is null; a step in which the switching of at least one electronic switch of a chopper branch is achieved when the voltage on the secondary is substantially null in order to minimize switching losses due to the opening/closing of the electronic -switch of the chopper.