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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. 

Extend the life of your power supplies

When choosing a power supply for your electronics application, pay close attention to its input voltage range. Sounds obvious, but engineers often forget to consider the possible range of input voltages their product will see in the real world. The result can be a reduction in the lifecycle of the power supply.

Our linear power supplies are known for their reliability, with a very conservative mean time between failure (MTBF) specification of at least 710,000 hours when run within an input voltage range that spans ±10 volts from nominal. But these supplies can last far longer than that if they run at the lower end of this input voltage range.

For example, a power supply designed to work at 220 Vac will operate within a range between 210 and 230 Vac. Consistently operating at the lower end of that range will keep your power supplies cooler and increase their lifespan substantially.

It’s not uncommon to see at least a 25 percent improvement in power supply lifecycle by operating at the low end of the acceptable input voltage range.

At the same time, consistently running the power supply at the high end of its input voltage range will keep it from reaching its maximum lifecycle potential, even though it will still meet the published MTBF spec.

Bottom line is that cooler power supplies will run longer than hotter ones. And one way to turn down the heat is to pick supplies so that operate at the lowest possible point on their input voltage range.

Reliable Power Supplies For Medical Applications

Looking for a safe, reliable way to power medical equipment in hospitals, doctor’s offices or in home health care settings? Our DC-DC converters and AC-DC converters meet a precise set of safety specs and requirements, making them ideal for applications involving patient contact.

Safety first. Our DC-DC converters and AC-DC converters can safely be used for a variety of medical machines including:

  • Diagnostic and therapy equipment.
  • Nebulizers and blood pressure monitors.
  • X-Ray machines.
  • Surgical tools.
  • Defibrillators.
  • Portable ventilators.

All our medical power supplies feature a low leakage current to prevent electrical shock from direct contact with equipment.

Packaging styles for AC-DC converters. Our AC-DC converters typically come with an open frame packaging style. To better meet your power supply needs, we also offer three other options:

  • Chassis mount.
  • Enclosed type.
  • DIN rail mount.