Inrush Current Control Technology Boosts Power Converter Reliability

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Trust a world-wide expert for your embedded critical network applications. SWITCHES & IP ROUTERS More than 3O models... VME, cPCI, VPX ComEth 4410a • Data/control Planes 3U VPX switch • Six 4-lanes ports (PCIe x4 Gen 1 & 2) • Up to ten Giga Ethernet Ports SBCs Intel ® & Freescale ® Intel processors ® ® & Freescale processo Intel ® Virtex ® 3U/6U with FMC site Communication Platforms Synch/Async serial ports / LAN pLinesEX • MPC8536 E • 8 sync/async serial ports • 3 Ethernet ports • One embedded L2/L3 switch with 8 SFP modules www.interfaceconcept.com +33 (0)2 98 573 030 [ 32 ] COTS Journal November 2011 Untitled-2 1 11/4/11 10:18:15 AM Special Feature 1 Vin Vin: 5V/div Vout: 5V/div lin: 20A/div Figure 6 Vout turn-on of downstream electronics until the inrush cycle is completed. For engineers designing avionics, military, or other high-reliability systems, the DVCL module is plug-and-play, meeting all hi-rel system specifications including the wide military temperature range of -55° to +125°C. VPT offers several additional input modules that include built-in inrush current limiting. These modules each use a series N-channel MOSFET in the positive lead. The N-channel MOSFET achieves the lowest ON-state resistance to minimize power losses. Locating it in the positive lead leaves the return path unbroken, simplifying system design. Using modules with built-in inrush current protection saves the engineer design time, board space and cost. Filtering and Transient Voltages Several modules also provide EMI filtering and input voltage transient protection. EMI is specified to MIL-STD-461. The EMI filter and inrush circuits are optimized to work together. The inrush circuit limits any current flowing into the EMI capacitors, but does not introduce any additional EMI into the input lines, as is possible with a discrete circuitry. Transient lin protection is specified to MIL-STD-461, MIL-STD-704, MIL-STD-1275, DEF- STAN 59-411 and ISO 7637-2 depending on the module. For transient protection, the high-side series MOSFET is used for dual purposes to provide both inrush limiting and transient protection. The VPT- PCM-12 is a special case in that it also contains switching elements, so it may require additional EMI filtering at its input. Inrush current is the peak current that flows into the power converter when the input voltage is applied or at turn-on. Many system specifications will be met with VPT’s DC/DC converters and EMI filters alone. Some applications that place limits on this inrush current may require additional inrush protection. This inrush protection can take several forms, from a passive thermistor, to discrete active circuitry, to a dedicated active inrush current limiter module. It is worth the effort to examine your design to see which solution meets your system specifications for the most efficient use of time and cost. VPT Blacksburg, VA. (425) 353-3010. [www.vpt-inc.com]. timescale: 1ms/div Shown here is the operation of a typical power system with a DVCL Inrush Current Limiter. A controlled voltage waveform is applied to the EMI filter and input capacitors. Inrush is negligible.
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Inrush Current Control Technology Boosts Power Converter Reliability

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