Soft switching isolation DC-DC converter for train auxiliary power supply

Abstract

The invention discloses a soft switching isolation DC-DC converter for train auxiliary power supply. The converter comprises a boost module, a resonant module, and an inverter module, wherein the boost module is used for carrying out boost processing on a power voltage accessed to a converter to acquire a predetermined high voltage; the resonant module realizes zero current shutdown based on the circuit state at the current time; the inverter module is used for inverting the predetermined voltage to a predetermined low voltage according to the shutdown state of the current boost module; and the boost module, the resonant module and the inverter module are serially connected in sequence. According to the technical scheme of the invention, the total size and the total weight of the circuit can be reduced; high accuracy can be ensured for operations in the overall output power range; and even if in a no load condition, the control mode of the converter does not need to be changed.

Description

technical field [0001] The invention relates to power electronic technology, in particular to a soft-switching isolated DC-DC converter for train auxiliary power supply. Background technique [0002] In order to increase comfort and meet higher travel speed requirements, modern railways are in great need of a continuous energy supply for auxiliary equipment such as air conditioning, lighting, pressure protection, etc. Due to the different voltage levels of European locomotives, the locomotive power is transferred to the carriages through a supply line (rated voltage varies from 1kVac to 3kVdc). For example, Belgian railways are powered by 3kV DC voltage. The customer supply voltage connected to such a power supply unit has a range from 24V DC for battery chargers to three-phase 400V AC for three-phase customers. The frequency of the output voltage can be fixed at 50Hz or variable frequency. [0003] At present, in the power supply system of auxiliary equipment, the electr...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to provide a novel half-bridge zero-current pulse-width modulation (HB-ZCS-PWM) dc-dc converter, which realizes electrical isolation through a lightweight intermediate frequency transformer, thereby solving the problem of electrical isolation in traditional auxiliary power supply systems. The problem of large and bulky low-frequency transformers for isolation

At the same time, the technical problems to be solved by the present invention are mainly: the existing zero-current dc-dc converter has a large number of passive components, large values ​​of inductance and capacitance, relatively large size and weight of the entire circuit, and light load and Overloaded control methods are different, etc.

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