Inductor

About: Inductor is a research topic. Over the lifetime, 52565 publications have been published within this topic receiving 484068 citations. The topic is also known as: passive two terminal.

Improved Core-Loss Calculation for Magnetic Components Employed in Power Electronic Systems

Abstract: In modern power electronic systems, voltages across inductors/transformers generally show rectangular shapes, as the voltage across an inductor/transformer can be positive, negative or zero. In the stage of zero applied voltage (constant flux) core losses are not necessarily zero. At the beginning of a period of constant flux, losses still occur in the material. This is due to relaxation processes. A physical explanation about magnetic relaxation is given and a new core loss modeling approach that takes such relaxation effects into consideration is introduced. The new loss model is called i2GSE and has been verified experimentally.

Handbook of Modern Ferromagnetic Materials

Abstract: Foreword Takeshi Takei. Preface. Acknowledgements. 1. Applications and Functions of Ferromagnetic Material. 2. Basics of Magnetism - Source of Magnetic Effect. 3. The Magnetization in Domains and Bulk Materials. 4. AC Properties of Magnetic Materials. 5. Materials for Permanent Magnet Applications. 6. DC and Low Frequency Applications. 7. Soft Cobalt-Iron Alloys. 8. Metallic Materials for Magnetic Shielding Applications. 9. High Permeability-High Frequency Metal Strip. 10. Metal Powder Cores for Telecommunications. 11. Crystal Structure of Ferrites. 12. Chemical Aspects of Ferrites. 13. Microstructural Aspects of Ferrites. 14. Ferrite Processing. 15. Ferrite Inductors and Transformers for Low Power. 16. Soft Magnetic Materials for EMI Suppression. 17. Ferrites for Entertainment Applications. 18. Ferrite Transformers and Inductors at High Power. 19. Materials for Magnetic Recording. 20. Ferrites for Microwave Applications. 21. Miscellaneous Magnetic Material Applications. 22. Physical-Thermal Aspects of Magnetic Materials. 23. Magnetic Measurements-Materials and Components. Bibliography. Appendix 1: Abbreviations and Symbols. Appendix 2: List of World's Major Ferrite Suppliers. Appendix 3: Units Conversion from CGS to MKS(SI) System. Index.

High-Efficiency Wireless Power Transfer for Biomedical Implants by Optimal Resonant Load Transformation

Abstract: Wireless power transfer provides a safe and robust way for powering biomedical implants, where high efficiency is of great importance A new wireless power transfer technique using optimal resonant load transformation is presented with significantly improved efficiency at the cost of only one additional chip inductor component The optimal resonant load condition for the maximized power transfer efficiency is explained The proposed technique is implemented using printed spiral coils with discrete surface mount components at 1356 MHz power carrier frequency With an implantable coil having an area of 25 mm × 10 mm and a thickness of 05 mm, the power transfer efficiency of 58% is achieved in the tissue environment at 10-mm distance from the external coil Compared to previous works, the power efficiency is much higher and the structure is compact with planar integration, easy to tune, and suitable for batch production, as well as biocompatible owing to no incorporation of ferromagnetic core

A wireless batch sealed absolute capacitive pressure sensor

Abstract: This paper reports the development of an absolute wireless pressure sensor that consists of a capacitive sensor and a gold-electroplated planar coil. Applied pressure deflects a 6 μm-thin silicon diaphragm, changing the capacitance formed between it and a metal electrode supported on a glass substrate. The resonant frequency of the LC circuit formed by the capacitor and the inductor changes as the capacitance changes; this change is sensed remotely through inductive coupling, eliminating the need for wire connection or implanted telemetry circuits. The sensor is fabricated using the dissolved-wafer process and utilizes a boron-doped silicon diaphragm supported on an insulating glass substrate. The complete sensor measures 2.6 mm ×1.6 mm in size and incorporates a 24-turns gold-electroplated coil that has a measured inductance of 1.2 μH. The sensor is designed to provide a resonant frequency change in the range 95–103 MHz for a pressure change in the range 0–50 mmHg with respect to ambient pressure, providing a pressure responsivity and sensitivity of 160 kHz/mmHg and 1553 ppm/mmHg, respectively. The measured pressure responsivity and sensitivity of the fabricated device are 120 kHz/mmHg and 1579 ppm/mmHg, respectively.

Micromachined electro-mechanically tunable capacitors and their applications to RF IC's

Abstract: Micromachined electro-mechanically tunable capacitors with two and three parallel plates are presented. Experimental devices have been fabricated using a standard polysilicon surface micromachining process. The two-plate tunable capacitor has a measured nominal capacitance of 2.05 pF, a Q-factor of 20 at 1 GHz, and achieves a tuning range of 1.5:1, The three-plate version has a nominal capacitance of 4.0 pF, a Q-factor of 15.4 at 1 GHz, and a tuning range of 1.87:1. The tuning ranges achieved here are near theoretical limits. Effects due to various physical phenomena such as temperature, gravity, and shock are examined in detail. An RF voltage-controlled oscillator with an integrated inductor and a micromachined tunable capacitor is also demonstrated. The active circuit and the inductor have been fabricated in a 0.5 /spl mu/m CMOS process. The voltage-controlled oscillator has been assembled by bonding together the CMOS and the micromachined parts. The 1.35 GHz voltage-controlled oscillator has a phase noise of -98.5 dBc/Hz at a 100 kHz offset from the carrier.