Abstract
This paper presents the implementation and evaluation of an isolated resonant converter and also compares the efficiencies of hard and soft switching isolated converter topologies using high-frequency transformer for auxiliary power supplies in DC traction. The half-bridge DC-DC converter with resonant network has been tested under zero voltage switching (ZVS), zero current switching (ZCS) operations, and also dead time variation of the power switches improving the overall system efficiency. This paper provides guidelines for a cost effective DC-DC converter design based on discrete 1200V/40A IGBTs driven with high switching frequency. That would allow optimization of passive elements by reducing their mass making the converter suitable for traction application. Simulations and test results of an experimental setup with output power up to 3kW are presented. The overall system efficiency of the ZVS and ZCS operations of half-bridge LLC DC-DC converter were compared with a classic hard switching topology.
Highlights
Typical light traction vehicles contain electrical equipment such as air brakes, cooling system, air pressures, fans etc. supplied from a standard 3×400VAC on-board power grid
The overall structure of an auxiliary power supply used in practice consists of the input voltage stabilizer (IVS), supplied from the catenary through, which stabilizes voltage to the catenary lower range level, and the half-bridge (HB) isolating converter
zero voltage switching (ZVS) and zero current switching (ZCS) conditions were tested separately in order to show the efficiency of the ZVS and ZCS converters separately
Summary
Typical light traction vehicles contain electrical equipment such as air brakes, cooling system, air pressures, fans etc. supplied from a standard 3×400VAC on-board power grid. The grid is generated by a structure of dedicated converters which usually provide battery charging functionality The design of such an auxiliary power supply has to respect the fact that the catenary voltage of nominal voltage 600VDC or 750VDC may vary in the range of 400VDC to 950VDC. A half bridge converter has been developed with a simple resonant inductor, capacitor and an additional switch, and obtained ZVS operation with 94.5% efficiency at 350W output power in [7]. This paper focuses on the high power DC/DC isolating converter which converts stabilized voltage 380VDC-390VDC (has to be lower or higher than input catenary voltage range) to a level suitable for the consequent appliances (standardly 560VDC to supply VSI to produce output power grid 3×400VAC). Bhajana & Drabek: Development and Evaluation of an Isolated Resonant Converter for Auxiliary
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