Analysis of a transistor direct-current converter with soft switching

A transistor bridge converter with an input inductor, active limitation of the voltage on the switches and galvanic separation of the output voltage from the power network is considered. The positive features of this converter, such as soft switching of power transistors, the absence of overvoltages on the switches, and high efficiency, are demonstrated. The phases of converter operation are considered and the control characteristic of the converter taking the leakage inductance of the transformer into account is illustrated. The criteria for choosing the inductance in the diagonal arm of the bridge and of the capacitance of the capacitor for limiting the voltage on the switches are determined. Results of tests on two prototype converters with different input and output powers are presented. The design relations are confirmed by experiment.