These filters are available in bulk size & need multi-stage LC circuits to attain significant high-frequency noise drop. These filters are mainly used to enhance EMI noise attenuation because of less cost & no need for control circuit otherwise components. This filter performance mainly depends on the source of the host circuit & load impedances. Passive EMI filters include capacitors and inductors which are connected in particular circuits to get the desired filtering. The bandwidth effectivity of these filters can be restricted relative to passive filters. These filters play a key role in low-level circuits as compared to high voltage or high input current AC power circuits. There are different types of EMI filters like VSVC or voltage sensing voltage cancellation, CSVC or current sensing voltage cancellation, VSCC or voltage sensing current cancellation & CSCC or current sensing current cancellation. The inductors allow low-frequency currents or DC to supply through while blocking the unnecessary high-frequency currents whereas capacitors provide a low-impedance lane to redirect the noise away from the i/p of the EMI filter either into the power supply otherwise into the GND connection. Generally, an EMI filter for a power supply includes passive components like capacitors & inductors which are connected to make LC circuits. Electro-Magnetic Interference is mainly generated from the electrical current switching and also from electronic power supplies.

The main function of an EMI filter is to decrease high-frequency electronic noise that may occur due to interference with other devices.

Most electronic devices include an EMI filter or fixed within circuit boards. So, the electromagnetic interference filter (EMC filter) is a device used to provide good electromagnetic compatibility. In the power system design process, the beginning of EMC design can enhance the overall anti-interference capacity of the power system and also expand the power system service life. Electromagnetic compatibility is an essential indicator to calculate the quality of the electronic product & it has become the key within the design of the electronic product.

Emi Filter Design Software