SynQor, a leading supplier of power conversion solutions to the military, industrial, rail transportation, commercial avionics, medical, and telecom/datacom markets, has unveiled the RailQor series of passive EMI filters. These EMI filters bring SynQor’s field-proven technology and manufacturing expertise to the industrial power applications marketplace. SynQor’s innovative packaging approach ensures survivability in the most hostile environments. Compatible with the industry standard format, these filters have high differential-mode and common-mode attenuation, low DC resistance, and a stabilizing bulk capacitor resistor. They follow conservative component derating guidelines and are designed and manufactured to the highest standards.
Basic Operation and Features
This module is a multi-stage differential-mode and common-mode passive EMI filter designed to interface a power source with one or more SynQor DC-DC converters (or other loads that create EMI). Each stage of this filter is well-damped to avoid resonances and oscillations, and only X7R multi-layer ceramic capacitors are used.
This RailQor EMI filter includes a large bulk capacitor with a series damping resistor to correct for the unstabilizing effect of a converter’s negative input resistance. A white paper discussing this negative input resistance and the need for corrective damping can be found on the SynQor website. A typical application would place the RailQor filter close to the input of the dc-dc converter. The input-side common-mode pin would be connected to the chassis ground that is common with the system input line filter or other earthed point used for EMI measurement. The output-side common-mode pin would be connected to the output ground or plane of the Attenuation power convectors with as low an inductance a path as possible. There are no connections to the metal baseplate, which may also be connected to the chassis ground if desired.
Operational Features
- 10 A output current
- Very low DC resistance
- >80 dB at 250 kHz differential-mode attenuation
- >50 dB at 250 kHz common-mode attenuation
- Stabilizing bulk capacitor and damping resistor included
- All capacitors are X7R multi-layer ceramic
- Meets requirements of standard EN 50155
Safety Features
- Baseplate isolation 2000 Vrms, 60 s per EN 50155
- UL 60950-1
- CAN/CSA C22.2 No. 60950-1
- EN 60950-1
- EN45545-2 R24/R25 Compliant
- CE Marked
Mechanical Features
- Industry-standard quarter-brick pin-out configuration
- Size: 1.536” x 2.386” (39.01 x 60.6 mm)
- Height: 0.500” (12.7 mm) Contents
- Weight: 3.53 oz (100 g)
In-Line Manufacturing Process
- AS9100 and ISO 9001 certified facility
- Full component traceability
