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.
Although plastics make up only about 11% of all US municipal solid waste, many are actually more energy-dense than coal. Converting these non-recycled plastics into energy with existing technologies could reduce US coal consumption, as well as boost domestic energy reserves, says a new study.
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