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High Current EMI Filters are commonly used on high power feed lines within MRI Machines and high-power Medical Lasers, in order to prevent any electronic interference issues and provide full Electromagnetic Compliance to common Medical Equipment regulations.
EMI Filters can be required on the Noise Source or the potential Noise Victim, and sometimes are installed on a certain line for both reasons! A filter installed on a properly shielded barrier will provide fully bi-directional protection.
What Types Of Medical Equipment?
In terms of devices that are likely to have a high-current connection and EMC requirements…MRI Machines and Medical Lasers are the most common types that might require a high current filter.
What Makes These EMI Filters Effective For the Application?
Our HPR Series filters are the Most Compact units available for their current ratings, and combined with Excellent Filtering Performance and an especially Rugged Design they are ideally suited for any high-current DC or AC filtering application. Medical equipment is subject to some of the most stringent EMC requirements of any industry, mostly because in most medical facilities there is a lot of equipment operating in close proximity with each other. Combine the crowded environment with the fact that people’s lives may be on the line when this equipment is being used, and you have the perfect explanation for the tough EMC requirements.
As electronics equipment and power systems become more and more complex, dealing with EMI/RFI issues becomes more and more important. For high current (high overall system power) power systems on mobile vehicles such as those being developed for new military vehicle designs, compliance with EMI requirements is just as critical as getting the system to operate normally on its own.
For example, new land-mobile vehicles are being introduced all the time…and their power and electronic systems are growing ever more complex. When this increased baseline complexity is combined with a need for maximum efficiency, more reliable operation, and potentially difficult environmental requirements (shock, vibration, temperature, etc.) the result is a potential design nightmare! The engineering challenges are sure to be many, with Electro-Magnetic Compatibility being one of many critical performance factors.
Even with this difficult intersection of requirements, NexTek’s HPR series of high current EMI/RFI filters are perfectly suited for this type of application for a wide variety of reasons. See below for a quick summary of the key features that make the HPR series perfect for rugged mobile power supply applications.
Rugged Construction – Extreme Shock, Vibration, Temperature Ratings
Extremely Compact Design – Maximum Space Savings, Available Bulkhead O-Ring
Filtering Performance – 60dB to 1GHz and beyond, to meet EMI/RFI Requirement Levels
NexTek’s range of filters are available with standard ratings such as:
50-400+ Amps RMS of Thru-Current
Cap Values up to 22µF+
DC Voltage Ratings from 100Vdc up to 1000Vdc
AC Voltage Ratings from 125Vac to 440Vac
Did you know that NexTek parts are currently used with the Power Systems of military vehicles all over the world to help ensure compliance with RFI/EMI requirements and continued trouble-free operation in “noisy” environments? Now you do!
As one of NexTek’s primary product lines, our range of High Current Feedthrough EMI Filters incorporate some advanced design features which make them unique. NexTek HPR Series filters are high-performance, military-grade designs that are built under stringent quality control systems and procedures. This post will focus on the High Frequency Filtering performance of NexTek’s HPR Series of EMI/RFI filters.
Why does High Frequency Filtering Performance matter?: The primary purpose of a feedthrough EMI/RFI filter is to eliminate radio frequency noise from a power cable. Maintaining adequate filtering performance to 1GHz and above ensures that noise in this frequency range can be effectively removed.
How do NexTek Solutions Differ?: Available high-current feedthrough filter solutions from other manufacturers’ do not use the same type of design, and this means that their filtering performance (as limited by the package and overall design) reaches a peak value and then falls off quickly afterward. In this case, maximum insertion loss is only achieved over a narrow band and the filter’s performance in the upper
MHz ranges is limited and continues to get worse as the frequency rises.
With the HPR series, the design has been optimized to maintain excellent filtering and loss characteristics to and beyond 1GHz. There is no other C-type filter family available with similarly excellent high-frequency performance.
Practical Example: Let us say that a given power supply is emitting noise in the 500MHz range, and a filter must be found and selected to ensure compliance with an applicable EMI Emissions industry standard. When exploring the market to identify possible solutions, it becomes clear that most feedthrough filters for high-current lines do not maintain maximum filtering performance to 500MHz. On the other hand, NexTek’s HPR series of feedthrough filter designs maintain relatively flat Insertion Loss performance through 1GHz. In this case, the direct filtering level comparison (xx dB down at 500MHz) demonstrates that the HPR series provides superior performance and is well-suited to this application.
Summary: NexTek HPR Series of EMI/RFI feedthrough filters incorporate some advance design techniques that are unique within the industry, allowing high filtering performance to be maintained to extremely high frequency ranges. When this high filtering performance is combined with other design factors such as their compact size, extremely rugged construction, and wide range of available Cap Values and Voltage Ratings…the HPR series of filters are leading-edge solutions.
Did you know that NexTek’s wide range of EMC solutions meet a huge number of MIL-STD requirements, from Environmental and Material standards to specific EMC-related Threat Standards.
For example, MIL-STD 202 is a comprehensive Environmental Conditions standard which most NexTek products meet to various levels. Although these requirements have nothing to do with Surge or EMI protection, any products used in a given system must meet these requirements if they are applied!
On the other side of things, there are many MIL-STDs that define Lightning or other Surge requirements that NexTek’s range of coaxial RF arrestors will help to address, such as MIL-STD 464, MIL-STD 461, or MIL-STD 188-125. By the same token there are EMI/RFI related requirements which NexTek’s HPR line of high current feedthrough filters can be used to address, such as MIL-STD 461 and others with EMI requirements.
NexTek is proud to announce the addition of two new pages our site, nextek.com. The new sub-pages cover the main Threat Types associated with Electro-Magnetic and Radio Frequency Interference challenges; Emissions and Susceptibility/Vulnerability. NexTek has nearly 30 Years of experience in solving challenging EMC problems and issues, and our standard line of high current feedthrough filters provide excellent EMI/RFI filtering to 1GHz and beyond!
What prompts concerns about EMI/RFI issues? Sometimes it is a practical concern which creates the need to look at these issues, such as the ensured functionality and safety of a new vehicle design. Other times it can be a specific EMC-related standard which applies to a given system or piece of equipment which lays out noise limits (in dBm, for example) across the Frequency Spectrum.
To learn more about how and why EMI/RFI Filters are used, follow the jumps below and learn more about two major (and closely related!) EMC topics, Emissions and Susceptibility.