The DVMN28 from VPT, Inc. is a combination EMI filter and transient suppression module that meets the military COTS (commercial off-the-shelf initiative. Product features include 0- to 50-V input with 600-V transient, 60 dB of attenuation (minimum) at 500 kHz, a soft start feature to ensure smooth startups, under-voltage lock-out circuitry for safe operation, and 99 percent … [Read more...]
BU Researchers Working on Light-Based, EMI Immune Wireless Networks
Boston University’s College of Engineering is one academic partner launching a major program, under a National Science Foundation (NSF) Grant, to develop the next generation of wireless communications technology based on visible light instead of radio waves. BU researchers (shown at left)expect to piggyback data communications capabilities on low-power, light-emitting diodes … [Read more...]
Meeting Military Requirements for EMC and Transient Voltage Spike Suppression
The basics of EMI and transient compliance for military systems using SMPSs are covered. Dr. Glenn Skutt, VPT, Inc., Blacksburg, Virginia, USA THE EMI AND VOLTAGE TRANSIENT CHALLENGE Military and aerospace engineers face several challenges with respect to electromagnetic interference (EMI) and transient voltage compliance. The standards developed by the various military … [Read more...]
Inrush Current in DC-DC Converters
Some applications may require limiting the inrush spike into the input capacitors. Steve Butler and Jeremy Ferrell, VPT, Inc., Blacksburg, Virginia, USA BACKGROUND Inrush current is the spike of current drawn by a power supply when it is turned on. A typical power system is shown in Figure 1. The input EMI filter will include some capacitance connected across the input … [Read more...]
South Carolina Seeks to Jam Cell Phones within Prisons
As this eNews was being prepared, a scheduled demonstration at the Lieber Correctional Institution in Ridgeville, SC was postponed because of severe weather conditions. Presumably, it will be rescheduled. The South Carolina Department of Corrections and Florida-based electronics firm CellAntenna Corporation had planned a demonstration of CellAntenna’s equipment on Tuesday, … [Read more...]
Miniature EMI Filter Arrays with ESD Diodes Target Mobile Handsets
A new family of electromagnetic interference, low-pass RC Pi filter arrays from OnChip comes with onboard diodes for electrostatic discharge (ESD) protection. These devices are crafted specifically for high-speed data LCD and memory card interfaces in mobile phones, PDAs, and MP3 players. The OC1425 is a 4-channel EMI filter while the EMF4020 and the OC1442 are 8-channel EMI … [Read more...]
Free Lightning Reference Poster
The Electronic Test Centre's Lightning Team offers an attractive laminated RTCA-DO160 Reference Chart for engineers involved in lightning testing. The chart includes the accepted qualifying factors of DO160 Change 3—waveforms, level requirements, and timings. The Electronic Test Centre has been performing EMC/EMI testing since 1989 and is accredited in MIL-STD, RTCA, SAE, and … [Read more...]
Varistors and Diodes Now Provide ESD Protection in Compact Packaging
Low-capacitance CeraDiodes® and multi-layer varistors (MLV) from EPCOS now provide ESD protection in a compact 0201 package. These devices with capacitances of 22 pF are characterized by a low clamping voltage and are well suited to the protection of LED background lighting. Types with capacitances up to 10 pF are also available for USB and Ethernet systems. Because of the need … [Read more...]
Automotive Transient Emission Test System Complies with ISO 7637-2
The new AES 5500 automotive transient emissions system from Teseq is the only complete solution for emission testing that is compliant to ISO 7637-2. This compliance makes this system the logical choice for testing the compatibility of conducted electrical transients of equipment installed in passenger cars and light commercial vehicles fitted with a 12-V electrical system. The … [Read more...]
Surge Protectors Safeguard Sensitive Telecom Applications
The E289 Series from Citel are surge suppressors. When plugged into a Citel base, these suppressors have been crafted expressly to protect sensitive telephone, datacom, and instrumentation equipment against harmful lightning surges and electrical transients. These suppressors utilize a hybrid that combines a fast response time (website. The NEBS/Telecom Forum on … [Read more...]
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