© 2013 CUI Inc

Railway Dc-Dc Converters

© 2013 CUI Inc

IntroductionPurposeTo provide an overview of CUI’s railway dc-dc converters, including an overview of product highlights, features, and the EN 50155 standard.

Objectives Highlight CUI’s railway dc-dc converters through a description

of key features and specifications. Summarize the EN 50155 standards for railway equipment. Describe typical applications for the railway dc-dc converters.

Content: 11 pagesLearning Time: 5 minutes

© 2013 CUI Inc

Designed specifically to meet the needs of railway applications.

Product Highlights High power density for compact applications

Ultra wide input voltage range of 66 ~ 160 Vdc

Wide operating temperature range of -40 ~ 100°C

Highly suited for applications with an unstable line voltage

Introduction

© 2013 CUI Inc

Ruggedized package

Protections: OTP, OVP, OCP, Short CKT and UVLO

Remote on/off control

Remote sense

Output trim

UL/cUL 60950-1 and CE certified

Features

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Modern railway systems achieve efficiency by using a nominal battery voltage of 100 Vdc. However, most electronic equipment runs on 5 Vdc,12 Vdc, and 24 Vdc. CUI’s railway dc-dc converters address this issue by converting the nominal 110 Vdc.

To satisfy the stringent EN 61373 shock and vibration standard, the railway bricks have been specially designed with high shock and vibration tolerances.

EN 50155 defines the relative humidity standard; the power module should be able to withstand 75% average yearly relative humidity and 30 consecutive days with 95% relative humidity in a given year.

Electromagnetic compatibility (EMC) is another main category of the EN50155 standard. It states that the power module should be protected so that it is not negatively affected by conducted or radiated interference. This is referred to as EN 50121-3-2 and should not emit radio frequency interference (RFI) in excess of the defined levels.

European Standard EN 50155

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EN 50155 defines several standards for electrical service conditions in an effort to overcome the severity of railway applications and to provide stable service. These standards include input voltage range, input voltage ripple, and input surges.

EN 50155 Standard Continued

Input Voltage Requirements

(Nominal Input)

Permanent Input Voltage Range

Brownout 100 ms (0.6 x Vnom)

Transient 1s (1.4 x Vnom)

24VDC 16.8-30.0V 14.4V 33.6V37.5VDC 26.2-47.0V 22.5V 52.5V48VDC 33.6-60.0V 28.8V 67.2V72VDC 50.4-90.0V 43.2V 100.8V96VDC 67.2-120.0V 57.6V 134.4V

110VDC 77.0-137.5V 66.0V 154.0V

CUI’s railway bricks have been designed to handle input transientsbetween 66 Vdc ~ 160 Vdc.

© 2013 CUI Inc

Isolation Voltage Summary

Condition Isolation

Input/Output 2250 Vdc

Input/Case 2250 VdcOutput/Case 1500 Vdc

Parameter Value

Isolation Resistance 10M ohm

Isolation Capacitance 1000 pF

Railway converters are galvanically isolated from the input voltage to protect sensitive load circuits from noise and high voltage.

© 2013 CUI Inc

Product Summary

Series Power(W)

Output Voltage(Vdc)

Size(in)

Standard Package

Efficiency

VQB100R 100 5, 12, 24 2.28 x 1.45 x 0.5 ¼ Brick 92%

VHB150R 150 5, 12, 24 2.28 x 2.4 x 0.5 ½ Brick 92.5%

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Typical Efficiency vs. Load Curve

Efficiency Curves

VQB100R VHB150R

© 2013 CUI Inc

ApplicationsCUI’s railway dc-dc converters are perfectly suited for awide range of railway and non-railway applications.

Railway electronics applications:LED displays, cabin lighting , computer systems, drive systems, control systems.

Non-Railway electronics applications:Designs that experience high transients including telecom systemsand battery-powered equipment.

© 2013 CUI Inc

Summary CUI’s compact, highly efficient VQB100R and VHB150R dc-dc converters

have been developed for railway applications.

The modules comply with the EN 50155 standard.

The internally potted and encapsulated design provides increased system reliability through added protection from environmental factors.

© 2013 CUI Inc

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