NDLI: Improved l-c resonant decay technique for q measurement of quasilinear power inductors: new results for mpp and ferrite powdered cores

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Improved l-c resonant decay technique for q measurement of quasilinear power inductors: new results for mpp and ferrite powdered cores

Content Provider	NASA Technical Reports Server (NTRS)
Author	Gerber, Scott S. Niedra, Janis M.
Copyright Year	1995
Description	The L-C resonant decay technique for measuring circuit Q or losses is improved by eliminating the switch from the inductor-capacitor loop. A MOSFET switch is used instead to momentarily connect the resonant circuit to an existing voltage source, which itself is gated off during the decay transient. Very reproducible, low duty cycle data could be taken this way over a dynamic voltage range of at least 10:1. Circuit Q is computed from a polynomial fit to the sequence of the decaying voltage maxima. This method was applied to measure the losses at 60 kHz in inductors having loose powder cores of moly permalloy and an Mn-Zn power ferrite. After the copper and capacitor losses are separated out, the resulting specific core loss is shown to be roughly as expected for the MPP powder, but anomalously high for the ferrite powder. Possible causes are mentioned.
File Size	611647
Page Count	14
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19950027453
Archival Resource Key	ark:/13960/t4vj0g99b
Language	English
Publisher Date	1995-08-01
Access Restriction	Open
Subject Keyword	Electronics And Electrical Engineering Electric Potential Q Factors Magnetic Cores Metal Powder Field Effect Transistors Capacitors Resonant Vibration Dynamic Range Iron Inductors Magnetic Measurement Switching Circuits Ferrites Permalloys Trademark Metal Oxide Semiconductors Decay Magnetic Materials Copper Transmission Loss Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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