Inductor Saturation In Buck Converter

I is the maximum current flowing through the inductor. The importance of saturation current lies in the fact that saturation of the inductor for a dcdc converter can lead to destructive consequences.

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Inductors are an essential component of switching voltage regulators and synchronous buck converters as shown in figure 1.

Inductor saturation in buck converter. An 1197selecting inductors for buck converters. Synchronous buck dcdc converter. December 21 2014 050959 pm without cycle by cycle current limiting or current mode control the inductor can saturate at turn on and that is why you need more headroom than simply output current plus half the ripple current plus 10.

If you want a stable output the upramp should be as high as the downramp. Inductor saturation current for buck converter reply 6 on. In all switching regulators the output inductor stores energy from the power input source when the mosfets switch on and releases the energy to the load output.

The rate of change in current is dependant on this voltage and inductance. When we increase the load current in buck converter capacitance and inductance values needs to be over dimensioned. Abstract this application report provides design information to help select an off the shelfinductor for any continuous modebuck converter application.

Buck boost converters produce a regulated output voltage either less than or greater than the input voltage. A buck converter has a rule that vinvout so you have a positive voltage charging the inductor and a negative voltage discharging the inductor. The dc current through an inductor biases the core and can cause it to become saturated with magnetic flux.

When the input voltage is higher than the output the converter acts as a buck. Frequently dcdc converters have current wave shapes with a dc component. But you can do that if you want.

Power inductors used for buck converters are roughly classified into three types. One effect of current through an inductor is core saturation. Usually the inductor is designed based on the energy need to be stored in the inductor.

When the inductor enters saturation it can store less energy and the ripple current increases meaning that the efficiency will be reduced. Just make sure you have no unknown unknowns. When the input is lower than the output the converter boosts.

Two simple formulae determine the current rating of the inductor. The wire wound ferrite type is further categorized into an open magnet type in which a wire is simply wound around a drum type ferrite core and a closed magnet type shield type that covers an open magnet type with a ferrite bobbin. Otherwise you get a falling or rising average.

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