With the increasing demand for high power and high frequency switch mode power supplies, manufacturers face the challenge of developing high current, low loss and cost effective power inductors. Inductor Applications One of the applications for power inductors is providing energy storage in switching regulators. In this example, energy is being stored in an inductor in the form of magnetic flux at the switch-ON cycle. Flux then collapses and is transformed back to electrical energy for maintaining supply to the load during the switch-OFF cycle. Another typical application for inductors is EMI suppression.
Inductors present a series of impedance when noise frequency enters through the component.
Resistance accounts for the major share of total impedance at high frequency. The reactance is the result of inductance and frequency in which noise is being blocked from going through the inductor. Reactance contributes to most of the total impedance at low frequency. There are several types of inductors on the market. These include solenoid, bobbin, shielded and toroid powdered core.