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Interference Technology

For EMI / EMC Engineers

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High-Voltage DC Filters for Power-Hungry Applications

 

With the unprecedented number of sophisticated equipment systems being integrated into critical civil and defence facilities such as communications hubs, control rooms, emergency response centres, datacentres, banks, stock markets and finance houses, power requirements have increased significantly, and so nowadays it is not uncommon to find high-voltage applications demanding … [Read more...]

Robust Capacitors Suitable for EMI Suppression in Input Filters

 

TDK Corporation has a new series of robust EPCOS MKP X2 capacitors for EMI suppression. Compared with conventional X2 capacitors designed for rated voltages of 305V AC, these new components offer a higher rated voltage of 350VAC. This makes them suitable for EMI suppression in input filters – specifically for applications on the North American market – and output filters of … [Read more...]

T-Filters, Transmission Lines and EMC

 

Have you ever had a signal integrity issue that did not have its toll on EMC? If you did then you should consider yourself lucky to have avoided this nightmare. I. Situation: An I2S bus master clock driver is set to 12.288MHz and run at 3.3V. Drive strength is at 50-Ohms. Rise time is at 2ns. Fall time is at 2ns. The driver is located on the “master board” and the bus … [Read more...]

Mitigating EMI Issues In Servo Motors and Variable Frequency Drives

 

Servo motors and variable frequency drives are wide-spread in the industry. Industrial automation cannot be imagined without these motors.  This article deals with certain EMI-related issues inherent to these motors, specifically high-frequency drive signals. Background Servo motors and VFD are typically comprised of two parts - the motor itself and a controller (also … [Read more...]

New 250A HEMP Filter Released

 

Historically within its range of HEMP protection filters, MPE has offered 200A and 400A variants to address powerline applications. However it has become apparent, particularly in the US defence and homeland security marketplace, that there are many applications which call for 225A as a requirement. To address this with an MPE filter would have previously meant either … [Read more...]

Sine Wave Filter with EMC Output Filter

 

Schaffner's new FN530 Sine Wave Filter with EMC Output Filter eliminates premature motor damage caused by high dv/dt, overvoltages, cable ringing, motor overheating and eddy current losses in industrial applications. Suitable for motor from 1.5 to 7.5 kW and from 4-16 A, with frequencies up to 200Hz, this technology converts the PWM output voltage of motor drives into a smooth … [Read more...]

EMI Filters Designed for Solar Applications

 

Schaffner has launched a new family of EMC and EMI filters for photovoltaic systems from 250A and 2,300A. With the approval of the latest CISPR11, Ed.6.0 international standard, which now defines the conducted emission limits at the DC power ports of "Grid Connected Power Conditioners”, EMC/EMI filters on the AC and DC side of inverters and converters contribute … [Read more...]

HERMES Program May Offer Increased Bandwidth for Wireless Communications

 

A team of researchers at the University of California, San Diego, working with the Defense Advanced Research Projects Agency’s HERMES program, say they may have found an answer to keep the multitude of signals from UAVs to embedded sensors and smart devices of all kinds. According to DefenseSystems.com, "HERMES, which stands for Hyper-wideband Enabled RF Messaging, was … [Read more...]

New Nanocrystalline Common Mode Choke Available

 

Pulse Electronics Power BU added a new series of high permeability, nanocrystalline products to its lineup of common mode chokes – the PA441xNL series. The PA441xNL series is comprised of two THT common mode chokes (PA4415NL and PA4416NL) that are ideally suited for customers designing their own EMI filter for AC/DC, DC/DC or DC/AC power supplies. Notable features and benefits … [Read more...]

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