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Hyper-X Magnetic Technology White Paper by Victor Quinn

This white paper introduces a novel magnetic coil technology that can significantly reduce dissipation and improve efficiency of magnetic components by optimizing winding parameters. As consumer demands and system requirements continue to push the need for smaller components, optimization of magnetic windings becomes a critical step to achieve overall system miniaturization. Hyper-X Magnetic Technology™ (“Hyper-XMT™”) is a patent-pending method to achieve these goals.

Hidden Value:  Technology Innovations in Magnetic Devices by James Tabbi, President | CEO, presented at Applied Power Electronics Conference, 2006

Magnetic components are frequently viewed as constraints to power supply innovation.  Market forces and regulatory requirements are driving power supplies to new levels of efficiency and power density.  Dramatic innovations in magnetic components are possible through unconventional thinking.  This presentation will give insight into the hidden potential of magnetic devices to bring added value to power systems.  The advantages of Tabtronics’ Hyper-X Magnetic Technology™ and the outlook of future potential advances in magnetic component research will be presented.

A Simple, Wireless Powering Scheme for MEMS Devices by Jie Wu, Victor Quinn, & Gary H. Bernstein

With recent developments in micromachining technology, fabrication of discrete microdevices is maturing; consequently, system integration is becoming an ever more important issue. One obstacle to such systems is the diverse power requirements of microdevices, especially actuators. Since some types of actuators exhibit relatively high voltage or power requirements, it is not feasible to integrate power supplies on-chip, and it is often inconvenient for the MEMS system to be tethered to interconnects for purposes of supplying power. On-chip wireless power sources can be implemented to circumvent this problem. Here, a simple wireless powering scheme, which utilizes a transformer with an air gap in its core, is demonstrated. The transformer secondary is fabricated on-chip and is detachable from the transformer. Experiments and simulations are performed to maximize the coupling between the primary and secondary. Coupling coefficient close to 0.8 was obtained. Frequency properties of the transformer were studied. In the case of the thin-film secondaries demonstrated here, the transformer operates at frequencies less than a few MHz. Usably high voltage (223.4 Vpp) and high power delivered to a load (4.5 Wrms) were obtained from the secondary to demonstrate the transformer capabilities.

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Planar Transformer White Paper by Victor Quinn

Most high frequency switching regulated power supplies cause nonsinusoidal excitation for the magnetic components.  Therefore, transformer design calculations must include an accurate determination of power dissipation and energy storage considering the operating waveshapes of the application circuit. The calculation of high frequency transformer power dissipation and energy storage has been the topic of much published work, and various methods have been proposed to address solenoidal coil geometries. This paper introduces a novel calculation method for improved design of a planar transformer used in a 300 kHz full bridge, buck regulator topology with full wave center-tapped secondary. For this application, accurate prediction of power dissipation and energy storage was essential to achieve the transformer performance goal of 1000 W/in³ throughput power density at 98% efficiency.

Scaling Design Methods To Improve Transformers by Victor Quinn

Tabtronics' innovative technology for improved transformer design is featured as the cover article in the October 2005 issue of Power Electronics Technology. The article, written by Tabtronics Chief Technology Officer Victor Quinn, utilizes normalized equivalent coils to help design engineers optimize transformers for specific power supply applications.

In this highly technical article, intuitive design techniques based on normalized loss and energy densities demonstrate real benefits for optimizing transformer configurations. These methods are a natural extension of Tabtronics' Hyper-X Magnetic Technology, a patent-pending magnetic coil technology that can significantly reduce dissipation and improve efficiency of magnetic components by optimizing winding parameters.

Finding the "Sweet Spots" of Solenoidal and Planar Transformers by Victor Quinn

This fast paced, comprehensive seminar establishes a foundation of transformer theory and empirical testing strategies to facilitate successful application of solenoidal and planar transformers in various Switched Mode Power Supply (SMPS) topologies.

Transformer theory is derived from fundamental concepts of physics and electrical engineering. Winding voltages and currents are evaluated for various SMPS topologies with corresponding analysis of harmonic components.

High frequency dissipation and energy storage are evaluated using a novel parametric density method based upon the surface field profile. This method facilitates an intuitive understanding of high frequency effects (and winding design impacts) and is readily extended to the annular winding configuration. In conjunction with theoretical derivations, this presentation introduces effective testing strategies to facilitate accurate characterization of transformer dissipation and energy storage for various SMPS applications.

These results are used to make a rigorous comparison of solenoidal and planar transformer performance. This comparison examines several versions of planar conductor configurations including PCB, flex circuit, and annular wound magnet wire for off line applications.

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