WHAT IS RFI (EMI) / EMC?

EMI (Electromagnetic Interference) is also referred as RFI (Radio Frequency Interference). While the concepts EMI and RFI are sometimes used synonymously, whereas RFI is a particular form of electrical activity on the EMI continuum, EMI is simply any intensity of electrical noise.

RFI is interference either because of electrical friction or electromagnetic radiation generated by an external entity that influences an electrical circuit. The disruption can disrupt, impede, degrade or reduce the circuit’s successful efficiency. Any entity, artificial or normal, carrying rapidly shifting electrical currents, including an electronic generator or a circuit, may well be the transmitter.

There are two forms of RFI that exist. Unnecessary high frequencies that operate on the shape of the AC wave are RFI performed. It is released into the air by radiated RFI. There are several pieces of hardware that can produce RFI, including variable frequency motors.

EMC (Electromagnetic Compatibility) implies nothing other than ‘a mechanical or electrical device shall function as expected in its environment. An electrical device shall not cause electromagnetic disruptions which are likely to impact the other component.’

In other terms, EMC tackles both the noise levels and sound immunity issues in computer and electrical devices and systems. In addition to radiated emissions and tolerance concerns, electromagnetic disruptions arise as performed interference.

WHAT ARE THE EFFECTS OF RFI IN YOUR ELECTRICAL SYSTEM?

If you are regularly witnessing trouble with your communication device, flashing display displays, compatibility problems with data networks, modulation failures, or misbehaving devices you are most likely witnessing RFI in your electrical platform. With ones electronics, computers and cellular phones, Radio frequency interference can cause havoc, allowing your work environment tough to cope up. Since most devices have electronically controlled circuits, they can become difficult or unstable to manage.

HOW DO YOU REDUCE THE EFFECTS OF RFI?

Based on the implementation, there are several options to reduce the impact of RFI. You can select from a wide variety of RFI philtres, chokes & pulse generators to perform RFI. For radiated RFI, one can select from a wide variety of shielding materials.

WHAT ARE THE DIFFERENT TYPES OF RFI FILTERS?

RFI sensors are required as feed through elements, or as PCB detectors, IEC inlet switches and energy entry units, single phase sensors, 3-phase detectors, 3-phase and neutral line sensors, output filters, and pulse transmission lines.

Based on the application, there are several options to reduce the impact of RFI. You can select from a wide variety of RFI philtres as follow-up for performed RFI.

1. SINGLE PHASE RFI FILTER

• SINGLE STAGE CIRCUIT
• SECOND STAGE CIRCUIT
• THREE STAGE CIRCUIT

In 240VAC single phase systems, this selection of RFI philtres is used to modulate EMI.

For practical cases, the single stage process is optimal.

For conditions where higher intensity is needed (very loud surroundings), the two stage circuit is optimal.

For situations where the maximum potential attenuation is desired (e.g. military installations), the three stage circuit is suitable.

 

1. THREE PHASE FILTERS

In three-phase electronic systems, this set of RFI philtres is used to amplify EMI. Popular applications involve digging, pumping, freezers, HVAC, and industrial adjustable speed drives (VSDs).

 

1. THREE PHASE + NEUTRAL FILTERS

In 690VAC three phase electronic systems that need a neutral link, this selection of RFI philtres are required to modulate EMI. Popular applications involve digging, pumping, refrigeration, HVAC, and factory variable frequency drives (VSDs).