Operating_systems-page17

Operating_systems-page17 - Jelena Mamenko Operating Systems...

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Jelena Mamčenko Operating Systems Lecture Notes on Operating Systems 17 accurate term for devices that convert one form of electric power into another form of electric power (such as transformers and linear regulators) is power converter . Uses in aviation The most exotic power supplies are used in aviation to enable reliable restarting of stalled engines. In jet transports, an engine is restarted from the power produced by the 400 Hz, three-phase AC generators attached to the shafts of the other engine(s). Most of the starting torque generated by the engine's motor/generator is provided by the current at the peaks of the AC waveform. If the aircraft electronics used simple rectifying power supplies, they would use current only from these peaks, since the diodes conduct only during the voltage peaks where the input voltage is higher than the output voltage. This could prevent the pilot from restarting an engine in an emergency. Therefore, aircraft power supplies take energy evenly from all parts of the AC waveform.
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