Vicor EMI Filters provide advanced electromagnetic interference suppression for power systems. These filters reduce both common-mode and differential-mode noise to help systems meet regulatory emissions standards and improve electromagnetic compatibility.
Overview
EMI (Electromagnetic Interference) filters are essential components in power systems that help manage electromagnetic noise generated by switching power supplies and other electronic equipment. Vicor's EMI filters use advanced filter topologies and components to suppress both conducted and radiated emissions.
These filters are designed to prevent noise generated by power supplies from propagating back into the input power source, while also preventing external noise from interfering with sensitive equipment. They are critical for meeting regulatory requirements like FCC Part 15, CISPR 22, and EN 55022 for conducted emissions.
Key Features
Advanced Filter Topology
Utilizes optimized filter configurations including common-mode and differential-mode stages to address different noise types.
High Frequency Performance
Designed to suppress noise across a wide frequency range from kHz to GHz frequencies.
Low DC Resistance
Minimizes power losses and voltage drop in the power delivery system while providing effective filtering.
Regulatory Compliance
Helps systems meet international EMI/EMC standards for conducted and radiated emissions.
Technical Specifications
| Model | Current Rating | Voltage Rating | Common Mode Attenuation | Differential Mode Attenuation | Package | Applications |
|---|---|---|---|---|---|---|
| IFx-1000 | 10A | 250VAC | 80dB typ. @ 10MHz | 60dB typ. @ 10MHz | Through-Hole | Industrial power supplies |
| IFx-2000 | 20A | 250VAC | 85dB typ. @ 10MHz | 65dB typ. @ 10MHz | Through-Hole | High-power systems |
| IFx-500 | 5A | 250VAC | 75dB typ. @ 10MHz | 55dB typ. @ 10MHz | SMT Package | Space-constrained applications |
| IFx-1500 | 15A | 250VAC | 82dB typ. @ 10MHz | 62dB typ. @ 10MHz | Through-Hole | Telecom power systems |
| IFx-3000 | 30A | 250VAC | 88dB typ. @ 10MHz | 68dB typ. @ 10MHz | Chassis Mount | High-power industrial |
Applications
Vicor EMI filters are suitable for a wide range of applications where electromagnetic compatibility is critical. Common applications include:
Data Center Equipment
Filtering for power supplies in servers, networking equipment, and storage systems to meet EMC requirements.
Telecommunications
Power filtering for base stations, routers, and other telecom infrastructure equipment.
Industrial Systems
EMI suppression for industrial automation, process control, and manufacturing equipment.
Design Considerations
Filter Placement
EMI filters should be placed as close as possible to the power entry point of the equipment to maximize effectiveness. Proper mounting and grounding are essential for optimal performance.
System Integration
Consider the interaction between the EMI filter and other components in the system. Load variations can affect filter performance, so verify operation across the expected range of operating conditions.
Thermal Management
EMI filters dissipate some power as heat, particularly at higher current levels. Ensure adequate thermal management in the system design to maintain reliable operation.
Frequently Asked Questions
What's the difference between common-mode and differential-mode noise?
Common-mode noise appears on both power lines with respect to ground in the same direction. Differential-mode noise appears between the power lines in opposite directions. EMI filters typically address both types of noise.
Why are EMI filters necessary in power systems?
Switching power supplies generate high-frequency noise that can interfere with other equipment and cause systems to fail electromagnetic compatibility (EMC) testing. EMI filters suppress this noise to ensure proper operation and regulatory compliance.
How do I select the right EMI filter for my application?
Consider the operating current, voltage, required attenuation, package constraints, and regulatory requirements. The filter should have adequate current rating with margin above your application's requirements.