Comparative analysis of two zero-current switching isolated dc-dc converters for auxiliary railway supply

Abstract

In modern railways coaches, the electrical separation between the high voltage side and the auxiliary equipments on the consumer side is realized by means of heavy and bulky 50 Hz transformers. In order to reduce the weight and size of the devices, today new power supply systems are proposed that consist in soft-switched isolated dc-dc converters with a lightweight medium frequency transformer and diverse output modules supplied by a common 600 V dc intermediate circuit. This paper aims to investigate in detail two such solutions of isolated dc-dc converters for auxiliary railway power supply where zerocurrent transitions are achieved for the primary inverter switches. A comparison based on several criteria (overall power rating, losses in power semiconductor devices, operation in the whole range of load, etc.) is presented.

Multiobjective optimal design of transformers for isolated switch mode power supplies

“…These specifications match with typical values of an auxiliary railway SMPS (see, e.g., [18], [19] or [20]). The choice of this topology is dictated by the fact that research has shown that full-bridge dc-dc converter is the preferred topology in high power applications if galvanic isolation is required [6].…”

A High Gain Single Switch DC-DC Converter with Double Voltage Booster Switched Inductors

“…Regarding two separated DC-DC converter possibilities for extra traction, the study [11] goes into considerable depth. The DC voltage is approximately 3000 Volts DC.…”