When outlining a custom EMI filter specification, apart from the basic electrical, function and mechanical requirements, it is critical to establish the product specific aspects of the device, such as real estate limitations, special environmental conditions and electrical requirements. #EMI FILTER DESIGN SOFTWARE HOW TO#How to choose an EMI filter depends on several elements of design consideration such as current, voltage, frequency, space, interconnections and most importantly the required insertion loss.įor most applications, the standard products can meet the design requirements but in cases where standard products are not able meet the required design considerations, a custom design becomes necessary. In many instances, although US, EU and international EMC regulations don’t apply, the equipment may still need an EMI filter for immunity from the noisy environment. In the US there are commercial (FCC part 15 & 18) and military standards that require similar EMI compliance. For example, if a product is sold in the European union, it must comply with EMC Directive 89/336/EEC, which requires mitigation of emissions from the equipment and be immune against the external interference. In many cases, preventing interference is a mandate that must be complied with. Should the unit suffer from radio frequency interference or fail EMI testing, a filter is required to mitigate the interference and bring the unit into compliance.Įlectromagnetic compatibility (EMC) engineers attempt to reduce the disruptions and failures caused by both conducted and radiated interference and emissions. While electromagnetic emissions can interfere with the operation of electronic circuits, these can also cause an equipment to fail the EMI regulations. Other electronics may experience interruptions, malfunctions or errors. For sound-producing devices, such as speakers, this could create static or crackling. Radiated interference travels through the air from sources such as appliances, motors, power supplies, cell phones and radio transmission equipment.ĮMI occurs due to electrical or electronic switching which creates high frequency noise signals producing disruptions in the operation of an electronic device. Conducted EMI propagates through cables such as power lines, electrical wires and signal lines. However, in critical applications such as the medical and military, such problems can be fatal.ĮMI has two primary modes of propagation – conducted and radiated. In some cases, EMI is simply an annoyance that causes interruptions. The impact of electromagnetic interference widely varies. Why You May Need Custom Design EMI Filter Solutions In most cases, a standard off-the-shelf filter can meet the application requirements, but in many instances, a custom EMI filter solution becomes necessary to meet the application specific parameters. Filter design and selection depends on the EMI regulations, electrical specifications and other design requirements. An EMI Filter is required to protect electrical devices from electromagnetic interference (EMI).
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