Post on 19-Jun-2015
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© 2012 CUI Inc
Railway Dc-Dc Converters
© 2012 CUI Inc
IntroductionPurpose
To 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 pages
Learning Time: 5 minutes
© 2012 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
© 2012 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
© 2012 CUI Inc
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
© 2012 CUI Inc
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 33.6V
37.5VDC 26.2-47.0V 22.5V 52.5V
48VDC 33.6-60.0V 28.8V 67.2V
72VDC 50.4-90.0V 43.2V 100.8V
96VDC 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.
© 2012 CUI Inc
Isolation Voltage Summary
Condition Isolation
Input/Output 2250 Vdc
Input/Case 2250 Vdc
Output/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.
© 2012 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%
© 2012 CUI Inc
Typical Efficiency vs. Load Curve
Efficiency Curves
VQB100R VHB150R
© 2012 CUI Inc
Applications
CUI’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.
© 2012 CUI Inc
Summary
CUI’s compact, highly efficient VQB100R and VHB150R dc-dc convertershave 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.
Learn More
View CUI’s VQB100R series
View CUI’s VHB150R series
View CUI’s full Power product portfolio