PRODUCTS POWER ELECTRONICS PROTECTION AND MONITORING FOR HIGH VOLTAGE DC POWER SUPPLIES L in inear T ch r Technolo logy Corp rporatio ion has introduced its LTM9100 µModule
(micromodule), all-in-one Isolated Anyside switch controller that protects and monitors high voltage DC power supplies up to 1000V. High voltage supplies used in industrial, datacom, avionic and medical applications require a controlled turn- on, with isolation needed for control
circuit protection, operator safety and breaking ground paths. Alternative relay-based or discrete solutions are bulky, complex, component-intensive and lack safety certifications. This device saves design time, certification effort and board area by wrapping all the needed functionality, including isolated power and digital telemetry, in a compact BGA package. A 5kVRMS galvanic isolation barrier separates the digital interface from the switch controller, driving an external N- channel MOSFET or IGBT switch. To guarantee a robust isolation barrier, the controller is production-tested to 6kVRMS and will be recognised by the component-level UL 1577 standard, saving months of
certification time for the end equipment manufacturer. Isolated digital measurements of load current, bus voltage and temperature are accessed via the I²C/SMBus interface, enabling power and energy monitoring of the high voltage bus. Due to its isolated nature, the
LTM9100 is easily configured for high side, low side (ground return) and floating applications. Inrush current is minimised by soft-starting the load, and the supply is protected from overload and short-circuits with a current-limited circuit breaker. This device is versatile enough to control inrush current in hot-swappable cards, AC transformers, motor drives and inductive loads.
www.linear.com
PASSIVE HARMONIC FILTERS CONSUMER AND INDUSTRIAL RECEIVES INTEGRATED HV START-UP CIRCUIT
Aimed at consumer and industrial applications is the integrated high-voltage (HV) start-up circuit from Diodes Incorporated. The company’s AP3984 is a high-performance power switcher for line-powered chargers and adaptors, that is claimed to deliver increased conversion efficiency with better voltage and current accuracy. The device is also claimed to feature ultra-low power consumption and improved protection functions. Designed as a primary-side controller, the
solution exhibits good transient characteristics when combined with secondary-side ICs such as the AP4341/2, supplying outputs above 4.3V. This is achieved with current and voltage tolerances of just ±5%. The built-in start-up circuit with integrated 700V bipolar junction transistor also eliminates external resistors,
simplifying system design and allowing the AP3984 to directly switch the line input. This device also has a programmable line voltage drop-compensation function. With protection features such as over-voltage, open- and short-circuit protection, and over-temperature protection (OTP) with auto-restart, the AP3984 meets Energy Star 6.0 efficiency criteria with a standby power of less than 10mW.
www.diodes.com
Schaffners’ new harmonic mitigation solutions includes its Ecosine evo harmonic filters. These devices can be used to control excessive power line harmonics. With the new ecosine filters FN 3441, FN 3451 and FN 3453 Schaffner does now also offer dedicated filters which are designed for three-phase diode rectifiers with a DC-link choke included in the drive. They guarantee compliance with the toughest requirements of IEEE-519 and other stringent international power quality standards. The filters offer excellent performance at rated power with minimal reactive power even at partial or no-load conditions. With the installation of the new ecosine filters the electrical infrastructure and its utilisation are much more efficient and reliable.
www.myecosine.com
Imagination Technologies has announced that MediaTek Inc. selected its PowerVR Series7XT Plus GPU for its new MediaTek Helio X30 processor. The 10-core Helio X30 is an advanced smartphone chipset with graphics that achieve some 2.4x performance boost and power savings up to 60 percent compared to the previous generations. The MediaTek Helio X30 SoC is claimed brings a new level of computing performance, power efficiency and multimedia features to MediaTek’s Helio family of processors.
www.imgtec.com
NEW SNAP-LUG POWER CONNECTORS SPEED INTERCONNECTION A
new series of heavy-duty power connectors from TE Connectivity is now available in
Europe through TTI, Inc.. The Snap-Lug Quick- Disconnect Power Connectors enable fast interconnection of heavy gauge power cables to bus bars, relays, batteries, power cables, grounding devices and more in aerospace, defence, marine and other harsh-environment applications. These connectors are easy to use and require no special tools. As they are designed to replace traditional terminal lugs with safe, reliable, quick-disconnect, keyed locking connectors, the time-consuming process of affixing lugs to threaded posts with a torque wrench is avoided.
/ ELECTRONICS The connectors have a snap on/push to
release design. As installation is achieved with a single piece that requires no washers or nuts, there is virtually no risk of foreign object damage or debris (FOD) occurring. Colour-coded and keyed for polarity, these devices can help to prevent damage caused by accidental polarity reversal. As they are also self-locking, confirmed with an audible and tactile click, the risk of partial mating is minimised. They can withstand high vibrations and extreme temperatures, preventing unintended disconnects and maintaining continuous power even in the harsh environments found in transport applications.
www.ttieurope.com
ELECTRONICS | MARCH 2017 23
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