These separate digital and analog control circuits, with a power stage, provide a complete motor-control platform for air-conditioning applications. The platform enables variable-speed sinusoidal-current control and eliminates the need for position sensors. The IRMCF311 or IRMCF312 provides the digital control. A patented Motion Control Engine (MCE) in the unit implements the complex, sensorless permanent-magnet, synchronous-motor algorithm in hardware. In addition, an Analog Signal Engine (ASE) contains all signal-conditioning and conversion circuits, and an application-layer processor defines the operation of the air-conditioning system to control both the ac fan and the compressor motors. Design tools allow controller-performance evaluation and algorithm customization with minimal effort. The IRS2136D 600V, three-phase analog-driver IC includes built-in bootstrap diodes and other features to simplify driving and protect the power stage's insulated-gate bipolar transistors (IGBTs). Packages for the IRMCF3xx are 64- or 100-pin QFPs and for the IRS2136D 28-pin SOICs or a 44-pin PLCCs.
Samsung's Galaxy line of smartphones used to fare quite well in the repairability department, but last year's flagship S5 model took a tumble, scoring a meh-inducing 5/10. Will the newly redesigned S6 lead us back into star-studded territory, or will we sink further into the depths of a repairability black hole?
In 2003, the world contained just over 500 million Internet-connected devices. By 2010, this figure had risen to 12.5 billion connected objects, almost six devices per individual with access to the Internet. Now, as we move into 2015, the number of connected 'things' is expected to reach 25 billion, ultimately edging toward 50 billion by the end of the decade.
NASA engineer Brian Trease studied abroad in Japan as a high school student and used to fold fast-food wrappers into cranes using origami techniques he learned in library books. Inspired by this, he began to imagine that origami could be applied to building spacecraft components, particularly solar panels that could one day send solar power from space to be used on earth.
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