Sample Applications for the Power Choke Tester DPG10

With the exception of air-core coils, all power inductors possess certain saturation characteristics. That means inductance decreases with increasing levels of current. This is due to the various core materials, which start to lose their permeability more or less strongly after a certain induction level B is reached and in extreme cases take on the characteristics of air. The saturation characteristics of an inductor can be influenced by:

the type of core material
core geometry
the number of turns
and the air gap

However, deviations often exist between the calculated inductance at a certain current level (i.e. rated current) and the real inductance, because:

the inductor geometry causes a non-homogenous field distribution
the core’s spec sheet entries are inaccurate or incomplete
production spread of the core is available
manufacturing tolerances
thermal influences

For this reason it is important to measure saturation characteristics during the development phase and quality inspection of power inductors.

Sample applications:

1.) PFC choke with nano crystalline core	5.) VHF choke with ferrite cylinder core
2.) Filter reactor with ferrite core under temperature influence	6.) Balance choke with ribbon core
3.) Output filter reactor with high-flux toroidal core	7.) Current compensated choke
4.) Mains line choke with laminated iron plate core	8.) Filter choke with iron powder core

deutsch

For detailed information about different inductance measurement methods especially for laminated iron plate cores in 50/60Hz-applications please click here (german language only). In this technical report you will find the advantages of using the di/dt measurement method of the DGP10 in comparison to the usual method with mains current and mains voltage.