Fig. 1 a , b It is ordinary ferrite inductance and saturable inductive hysteresis loop respectively. Can find out from two magnetic Hysteresis these saturable inductance have high the intersection of hysteresis loop and rectangle than Br/Bs obvious in the collinear contrast ,High initial permeability i, low coercive force Hc, some A, B of obvious full profit of magnetism Wait for the characteristic. In addition, from Fig. 1 b Can also find out, the area that the saturable inductive hysteresis loop surrounds is narrow and small, so the saturable inductive high-frequency hysteresis loss is corresponding smaller. Because the saturable inductance is usually made by magnetic material such as crystallite, non-crystalline, Permalloy, so the saturable inductance generally has very high initial permeability i and very high saturation magnetic induction intensity Bs. Because of the difference on the physical characteristic, there are two pieces of obvious difference with ordinary ferrite inductance in application in the saturable inductance.

Ordinary ferrite inductance and saturable inductive hysteresis loop of Fig. 11 Because the magnetic field intensity of the saturation is very small, saturable inductive stored energy ability is very bad, can’t serve as inductance of stored energy. It is saturable it is inductive maximum stored energy Emax, theoretical value show for following formula: Emax =. H2.V/2

in the type – -Magnetic conductivity of the critical saturation point;

H – -Magnetic field intensity of the critical saturation point;

V – -Effective volume of the magnetic material.

2 Because the high, magnetic resistance of saturable inductive initial permeability is little, inductance system and inductance quantity are all very great, while exerting the external voltage, the initial current increases slowly, only pass within the inductance After delay time of T, when the electric current in the inductance coil reaches certain number value, the saturable inductance will be saturated immediately, have very obvious switching characteristic, often regarded as the controlled time delay on-off element and use in the circuit, saturable this inductive kind of switching characteristic is not possessed by ordinary ferrite inductance.

Ordinary ferrite inductance and saturable inductance curve that current strength r varies with time swallow under direct-current volts Udc function, such as Fig. 1 a , b Shown.