Primary isolation power supply module for on-vehicle electronic equipment of railway locomotive

Abstract

The invention provides a primary isolation power supply module for on-vehicle electronic equipment of a railway locomotive. A circuit board of the power supply module is divided into a mainboard and asynchronous rectifier plate. The synchronous rectifier plate includes a synchronous rectifier circuit and a synchronous rectifier control circuit. The above circuits, a transformer and heat sinks areall arranged on the mainboard; the heat sinks of the power module comprise a heat sink I located on the primary side of the transformer and a heat sink II located on the secondary side of the transformer; and a power MOSFET tube in a PWM control circuit adopts an all-plastic structure and is mounted on the heat sink I. The synchronous rectifier plate is mounted on the heat sink II. The mainboardadopts a double-sided device layout, and the top layer of the mainboard is provided with a high-height device, and the bottom layer of the mainboard is provided with a low-height surface mount device.The separate heat sinks are used for the input power MOSFET and the output synchronous rectifier plate, respectively, and the insulation distance between the two is large, reducing the common mode interference between the input and the output.

Description

technical field [0001] The present invention relates to a primary isolated power supply module used in on-board electronic equipment of railway locomotives, in particular to an on-board electronic equipment on railway locomotives that requires wide input voltage range, wide operating temperature range, good electromagnetic compatibility (EMC) performance, and high reliability application Isolate the power module once. Background technique [0002] The DC110V DC power supply in the electrical environment of railway locomotives has a lot of interference and large voltage changes; while the ambient temperature and humidity range of railway locomotives vary greatly, and the altitude changes greatly, which has a great impact on the stable operation of electronic equipment on-board railway locomotives. It is required that the primary isolated power supply directly facing the DC110V DC power supply of the railway locomotive must be reliable and stable, so as to reduce the failure r...

AI Technical Summary

Problems solved by technology

However, the primary isolated power supply module used in the electronic equipment of railway locomotives cannot fully take into account the wide DC110V input voltage range, wide operating temperature range, high insulation performance and good electromagnetic compatibility (EMC) or high efficiency and reliability.

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