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Robust DC-DC converters meet railway requirements

Railway electrical systems can be tough on DC-DC converters. That’s because the converters have to contend with a multitude of background signals that can cause interference.

Air-conditioning, lighting, broadcasting and fire systems can prevent DC-DC converters from working the right way.

Railroad-Ready DC-DC Converters. Our quarter and half brick DC-DC converters for railway applications are designed for efficiency in these conditions. Also offered with a 24 pin DIP package of 1.25” x 0.80” x 0.40” or an industry standard package of 1.0” x 2.0” x 0.40,” these DC-DC converters come in a variety of wattages and meet all EN50155 requirements including input, electromagnetic compatibility, mechanical, thermal and isolation. They also feature adjustable output voltage and no minimum load requirement.

DC-DC converters that meet EN50155 standards specify a nominal input variation of ±30%, including ripple. Most trains achieve weight and space savings by using battery voltages up to 110 Vdc. However, most system equipment requires input power between 12 and 24 Vdc. DC-DC converters that meet these standards transform the basic 110 Vdc to 12 and 24 Vdc.

Technical Features. Our DC-DC converters protect electronic railway equipment against dielectric strength through different isolation barriers. For 24 and 48 Vdc nominal input, EN50155 requirements for rolling stock are 500Veff/50Hz/1min. For 72 to 315 Vdc, the requirements are 1.500Veff/50Hz/1min.

Our internal noise solutions make for very clean signals both to and from the DC-DC converters to optimize overall operation. The DC-DC output is maintained for 10 milliseconds during power outages.

These converters also pass shock and vibration testing for harsh environments. Shock load tests have accelerations as high as 5g for 50 ms, while vibration tests require accelerations up to 5g frequencies up to 150 Hz.

Other features include under voltage, output current, short circuit, over voltage and over temperature protection. Their ability to survive harsh environments with high shock and vibration loads helps reduce premature system failures in railway applications.