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Introduction to Metallic Glass 9. Introduction to Soft Ferrites 10. Manganese-Zinc Ferrites 11. Nickel-Zinc Ferrites 12. Introduction to Molypermalloy Powder Cores 13. Introduction to Iron Powder Cores 14. Core Loss Copyright 2002 by Marcel Dekker, Inc. All Rights Reserved. Introduction The magnetic material is the paramount player in the design of magnetic components. The magnetics design engineer has three standard words when making the normal design trade-off study: cost, size, and performance.
Below are two, prominently used power loss factors, expressed in watts per square centimeter of the total surface area. 001 10° C 100° C AT = Temperature Rise, °C Tr =450 Figure 1-16. Temperature Rise Versus Surface Dissipation. Copyright 2002 by Marcel Dekker, Inc. All Rights Reserved. Chapter 2 Magnetic Materials Copyright 2002 by Marcel Dekker, Inc. All Rights Reserved. Table of Contents 1. Introduction 2. Saturation 3. Remanence Flux, Br, and Coercivity Hc 4. Permeability, ju 5. Hysteresis Loss, Resistivity, p, (core loss) 6.
The difference between the input power and output power is converted into heat. This power loss can be broken down into two components: core loss and copper loss. The core loss is a fixed loss, and the copper loss is a variable loss that is related to the current demand of the load. Copper loss increases by the square of the current and is also termed quadratic loss. Maximum efficiency is achieved when the fixed loss is equal to the quadratic loss at the rated load. Transformer regulation is the copper loss, Pcu, divided by the output power, Po: P*=Pcu+Pfc, [watts] Inductor Losses The losses in an inductor are made up of three components: (1) copper loss, Pcu; (2) iron loss, Pf e ; and (3) gap loss, Pp.