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EETE OCTOBER 2012

DESIGN & PRODUCTS SMD electronic fuse offers LED lighting Spray-On shielding materials lighter and overcurrent protection cheaper than metal cans AEM Components announced the introduction of its AirMatrix Chomerics Europe has introduced two innovative new coat- 2410 family of surface mount electronic fuses that provide AC ings that provide shielding of semiconductor packages and line overcurrent protection for LED lighting applications. Air- other board and package level electronic components that Matrix is provided in an EIA 2410 compact package. LED light require protection from electromagnetic interference (EMI). bulb assemblies have limited board space making the AirMatrix Cho-shield 604 and Cho-shield 571 are highly conductive package size ideal for this and other space constrained applica- materials suited for high volume applications and are applied tions. The AirMatrix 2410 package enables flexible board place- using precise spray equipment to coat the target surface. ment and is compatible with standard pick-and-place technol- Cho-shield 604 is a one component sliver-filled polyurethane ogy. This also reduces assembly cost and saves board space. material that achieves shielding effectiveness in the region of AEM’s AirMatrix 2410 is the industry’s smallest fuse body with 100 dB (10 to10,000 MHz) and 80 dB at higher frequencies 250VAC rating. AirMatrix has an operating temperature range (10 -18 GHz). Cho-shield 571 meanwhile is a two-component of -55 degrees Celsius to 125 degrees Celsius. The series silver-filled epoxy with shielding performance that can reach complies with multiple safety standards including UL, PSE, in excess of 120 dB (10 to 10,000 MHz) and 100 dB (10 – 18 TUV and CQC. The AirMatrix surface mount devices (SMD) GHz). Maximum surface resistivity for both materials is 10 are lead-free, halogen-free and RoHS complaint. AirMatrix milliohms / square at one mil. Both materials are flexible and electronic fuses are offered in a wide range of current ratings offer a high degree of environmental stability. This helps it for various applications: 0.5A – 2A (250VAC/125VDC), 2.5A – achieve an especially strong bond with component surfaces. 10A (125VAC/125VDC) and 12A – 20A (65VAC/65VDC). They Wave solder temperatures in excess 262°C can be withstood are also suitable for other common AC and DC applications. by both materials, and they have a continuous upper operat- They include LCD TVs; telecommunications and networking ing temperature of +85°C equipment; battery packs; server and storage systems; power Chomerics Europe adapters; backlight drivers; industrial and medical equipment; www.parker.com and more. AEM Components www.kruse.de Renesas claims first NFC Power inductor offers 0.11 to 0.23 micro wireless charging solution Renesas Electronics has developed a near field communication Henry in a 6.5x7.5x3.0mm package (NFC) wireless charging system to eliminate the power cable for Alps Green Devices has developed the GLMH Series Liqual- charging and increase efficiency of those systems. The compa- loy power inductor for mobile devices that are used for long ny supplies the essential compo- periods. Enabling mobile equipment to run for a long time nents needed to build a system: the entails lowering the power consump- NFC microcontroller (MCU) RF20, tion of not only the CPU and the the power transmitter IC R2A45801, various devices, but also the DC/DC and the power receiver IC converter, used to supply power after R2A45701. A complete kit including converting voltage. This creates a need peripheral general-purpose devices for high-efficiency power inductors, (such as. power semiconductor devices) as a system solution is which are used inside DC/DC converters. However, an issue also available.Wireless charging is starting to become popular with power inductors so far has been power conversion ef- in products such as smartphones. It eases battery charging of ficiency during low-load CPU operation. The GLMH Series portable devices and makes cables and connectors redundant. Liqualloy power inductor employs an integrated coil-terminal Today’s existing wireless charging systems typically couple two structure, applying original technology for high-precision antennas, one for receiving and one for transmitting power. The forging of thin coil wire. With the coil wire doubling as the gap between and the combination of the two antennas highly terminals, DC resistance is reduced by 10 to 20% compared influence the efficiency of the charging power. Such existing to conventional types with the same level of inductance. This wireless charging systems limit the effective charging area sig- structure keeps DC resistance tolerance to a narrow ±5% nificantly. In consequence the alignment of the transmitting and and reduces heat generation during high-load operation, receiving antennas greatly reduces the freedom of product de- thereby further improving on the high current compatibility sign.The Renesas NFC wireless charging technology widens the of earlier products. Liqualloy, the inductor’s core material, is charging area to about 10 cm. It incorporates the technology of a magnetic amorphous alloy created through joint research the existing NFC MCU, and utilizes the NFC antenna to imple- between Alps Electric and Tohoku University. It is drawing ment a wireless charging system that uses a single RX antenna interest as a new magnetic material to use in place of the for NFC communication and receiving power, thereby improving most common core material, ferrite, and the second most reliability while reducing the bill of material of a receiver design. common, iron powder. Using Liqualloy as the inductor’s core The NFC MCU, the power receiver IC, and the power transmit- material allows minimization of power loss during conversion, ter IC are built around the company’s proven power technology. thereby enabling high efficiency especially during low-load These new products are the main components necessary to operation. DC resistance ranges from 0.57 to 1.10 mΩ ±5%. implement a wireless charging system and are supplied as a Alps Green Devices total solution kit. www.alps.com Renesas Electronics www.renesas.eu 48 Electronic Engineering Times Europe October 2012 www.electronics-eetimes.com


EETE OCTOBER 2012
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