Magnetics Business & Technology - Summer 2015 - (Page 18)

ELECTROMAGNETICS Expanded Gate Drive Transformer Series Complies With Safety Standards for Reinforced Isolation Pulse Electronics Corp. has expanded its P0584/85NL high isolation gate drive transformer line with a new series that uses insulation wire on all windings, making them compliant to safety standards such as IEC61558 and IEC60601 for reinforced isolation. The P0584/85NL series provides isolation in MOSFET and IGBT drivers in industrial applications such as motor drive circuits and solar inverters and for power supplies for a range of medical devices. The P0584/85ANL versions extend these to applications that require higher levels of safety and isolation with 30 percent increased isolation capability (to 4,250 Vrms) and 20 percent greater volt-second capability. "Existing toroidal gate drive transformers with triple insulated Teflon wire on just one winding are not compliant to certain safety standards which require mechanical support between windings, even when triple insulated wire is used on one winding," said Gerard Healy, product manager, Pulse Electronics Power Business Unit. "Pulse's new P0584/85ANL series uses insulated wires on all windings, making them fully compliant. In addition, by using smaller wire diameters, Pulse can increase the number of turns to increase voltsecond capability within the same platform size." Magnetically Coupled Components from SMP SMP Sintermetalle Prometheus GmbH & Co KG (SMP) has expanded its portfolio of inductive components with the development and design of magnetically coupled components. Magnetically coupled components have the following advantages over components that are not magnetically coupled: they are less expensive, they are made using less material, so they are more compact and weigh less, and their loss balances are lower than those of non-magnetically coupled components (eco-design). Faster clock frequencies are possible. The quality factor is set without exposing the choke to any thermal load, and EMC considerations are reduced. The magnetizing and leakage inductances can be specifically set by adjusting the magnetic coupling. This is done by varying the geometries of the injection molded parts and using different coil types, such as separately wound coils, bifilar coils or superimposed wound coils. The range of magnetically coupled components is designed for currents up to 2,000 A and frequencies up to 500 kHz, which can be increased to 2 MHz in special applications. SMP uses powder composite materials that have been developed and manufactured entirely in-house and feature lower eddy current and magnetic reversal losses. The three-dimensional isotropy of the materials results in compact, lightweight structures, because the magnetic circuits 18 Magnetics Business & Technology * Summer 2015 are minimized. This also lowers the magnetic field strength, and the quantity of winding material used can be significantly reduced. Special magnetorestriction-free materials ensure that components run very quietly. These materials, which are developed and produced according to individual customer specifications, have a high saturation induction, up to 2 Tesla. And the oscillation behavior of the choke can be adjusted specifically by using certain materials or appropriate, magnetically coupled constructions with multiple coils. Wurth Electronics Presents SMD Air Coils for High-Frequency Applications High-frequency applications, especially in the area of radio technology, require air coils with a particularly high Q-factor. Specifically adapted to the current market requirements for this area of applications, Wurth Electronics is now expanding its portfolio of WE-CAIR air coils by the design types 1322 and 1340. These types are onethird flatter than the current types of this series of products. The 1320 type in the WE-CAIR series has a 20 percent higher rated current with the conventional ceramic coils in the 0805 chip format. Its high Q-factor remains stable even in the high MHz range, thus enabling these extremely flat air coils to be used over a broad spectrum of frequencies. Due to the air coil, the inductance can be kept constant all the way into the GHz range, meaning that these new air coils are predestined for use in radio-engineering applications. A compact design combined with a high Q-factor and a high rated current enables use in HF front-ends of all kinds and for the adjustment of the impedance of antennas for diverse frequency bands. Samples are available free of charge on request. All products are available from stock. New Hall-Effect Speed/Direction Sensor IC with Hysteresis Detection Allegro MicroSystems, LLC has introduced a Hall-effect speed and direction sensor IC with hysteresis detection. The A1232 is a highly sensitive, temperature stable, magnetic sensing device suited for use in ring magnet based speed and direction systems in harsh automotive and industrial environments. It is the first device of its kind with the ability to detect when it powers up in the magnetic hysteresis band. This feature reduces angle accuracy error, which can occur when edges are missed at start-up. This magnetic sensor IC is targeted at the automotive motor market. Key applications include: window lifts, sunroofs, sliding doors and tail/trunk lift gates. This device is also suitable for applications such as garage door openers and window blinds. Allegro's A1232 includes dual Hall elements spaced 1.63 mm apart that are photolithographically aligned within 1 µm. The prewww.MagneticsMagazine.com http://www.MagneticsMagazine.com

Table of Contents for the Digital Edition of Magnetics Business & Technology - Summer 2015

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Bonded Magnets: A Versitile Class of Permanent Magnets
Spintronics on Paper: The Whys and Wherefores
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Magnetics Business & Technology - Summer 2015