Premier EMI Filters

Electromagnetic Interference (popularly known as EMI ) is an electromagnetic/electrical disturbance that causes the malfunctioning or degradation of electrical equipment. It can not only lead to the loss of transmitted data, but it can also damage the equipment completely.  Despite all the disruptions caused due to EMI, it is common in the modern environment. EMI occurs due to natural causes as well as human-made electrical devices. Human-made EMI results due to electrical/electronics circuits, switching systems, or changes in large amounts of current. Human-made EMI occurs in both the residential and industrial sectors.  Let’s understand the causes of electromagnetic noise in detail. Natural Causes A variety of sources that lead to natural causes of EMI are the sun, dust storms, lightning strikes, snowstorms, solar flares, static electricity, solar magnetic storms, cosmic noise, and atmospheric electrical storms. The sudden occurrence of natural EMI creates a severe impact on...

EMI and EMC EMI (Electromagnetic Interference) means disrupting the operation of an electronic device placed close to the electromagnetic energy of an external electrical source (natural or man-made). Disruption may cause the failure of the device, or the device may not be able to function properly. EMI is, sometimes, referred to as RFI (Radio Frequency Interference).  EMI sources can be natural or man-made. Natural sources include solar radiation, electrical storms, etc., while man-made sources include other electrical devices like switch-mode power supply, the internal circuitry of personal computers, etc. EMC (Electromagnetic Compatibility) means enabling a device to function properly in its intended environment in the presence of EMI sources. This device is known as EMC compliant. EMI or EMC Testing Testing is essential as it ensures that a device caters to the required standards. EMC pre-compliance and compliance testing are performed by companies to ensure EMC/EMI complianc...

  EMI and EMC are the two terms that are related to each other and used for referring to the regulatory testing of electronic components and consumer goods. However, these two terms are different from each other.  All electronic devices or equipment produce electromagnetic radiation. We assume electronic devices as closed systems, however, the electricity flowing through the circuits and wires is never fully contained. The energy can travel through the air as electromagnetic radiation and/or conduct along interconnecting I/O or power cables, typically known as disturbance voltage. Both EMI and EMC testing requirements can become complex with a wide variety of industry and application-specific implications that must be considered before bringing the product in the market. Let’s understand the difference between EMI and EMC.  Electromagnetic Interference (or EMI) The interference caused by an electromagnetic disturbance that affects the performance of an electrical/electro...

  EMI Electromagnetic Interference (or EMI ) is said to occur when an electronic device does not receive the intended current due to the interruption of unwanted electric currents. Such disruptive currents (also termed as Noise or Electromagnetic Noise) generate from any external source or any components of the device.  Electromagnetic interference can be produced from various sources like AC motors, light dimmers, microprocessors, switch-mode power supplies, etc. It may disrupt the functioning of the device or lead to improper functioning of the device. Based on the level of disruption, EMI impacts the quality of the signal received by the device such as poor mobile networks. The severity of disruption leads to fatal consequences like failure or malfunction of medical equipment. The impact of EMI depends on several factors like interference duration, noise immunity of the device, etc. EMI is mainly of two types namely  Conducted EMI Radiated EMI In conducted EMI, noise ...

  Introduction Interference occasionally occurs in most of the radio equipment including wireless microphones. It may disrupt the device’s operation or cause system failure. Interference can be categorized into three basic types - radio frequency interference, electrical interference, and intermodulation. Let’s understand radio frequency interference (or  RFI) in detail. RFI Mostly, electronic and electrical devices such as industrial controls, switching power relays, and medical instrumentation emit radio frequency interference ( RFI ). These devices can emit radio frequency interference in two ways:  Radiated RFI, and Conducted RFI When a device directly transmits the interference to the environment, then this phenomenon is known as radiated RFI. Whereas, when a device uses its power cord to transmit interference to the AC power line through, then this phenomenon is known as conducted RFI.  Radiated radio frequency interference can be controlled by proper shieldin...

  Industrial applications predominantly require a high power supply to support high-power equipment (such as induction circuits, inverters, and heating systems). Therefore, high power equipment is generally designed for 3-phase (or poly-phase) AC power. The 3-phase AC power plays a crucial role in the electrical system design as it splits the total power into various phases, and thus optimizes the power system (both generation and distribution) and equipment design.  3-Phase System  It consists of three current-carrying conductors (or phases). All three phases (A, B, and C) are set at the same voltage and frequency and phase-shifted from each other by an angle of 120°. It helps to transfer constant power during the electrical cycle. There are two configurations of 3-phase systems, namely Delta and WYE configurations which maintain equal loads.  3-Phase EMI Filter High power conversion (such as rectifying) generates higher-order harmonics of different switching frequ...

EMI filters are used in power grids to suppress the noise is known as EMI power line filters. Currently, electronic devices or equipment mostly use SMPS (Switching Mode Power Supply) and fast digital circuits. When these devices or equipment operate in normal conditions, they generate high-frequency voltage and current. It is nearly impossible to meet the requirements of the EMC (Electromagnetic Compatibility) standards without using the power line filter. Power line filters mainly perform two primary functions. Firstly, it prevents the high-frequency signals (that get generated within the device) from reaching the input power line. And secondly, it prevents the high-frequency signals (produced on the AC power distribution system) from entering into the device or equipment. The efficiency of a power line filter does not only depend on the electrical design of the filter but it equally depends on where the filter is mounted, how it is mounted, and how leads are connected to the f...