Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1977-12-08
1979-08-14
Shoop, William M.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363 37, 318158, 322 69, 361 20, H02H 710, H02P 910, H02P 766
Patent
active
041647858
ABSTRACT:
A multiphase to single phase electrical energy converter wherein the frequency is converted from a relatively high frequency, in order of 1,000 hertz, to a relatively low frequency, as for example, normal household frequency of 60 hertz. A three-phase alternator is driven by an internal combustion engine, the output of the alternator being fed to a full-wave bridge circuit and finally to an inverter. The output of the bridge circuit is acted on by a resolver. The resolver is utilized to control the delivery of energy from the alternator to the inverter to provide an average current or power to the inverter which increases and decreases in a unipolar sinusoidal form at a frequency which is twice the desired output frequency. The inverter is utilized to invert every other cycle of the output from the resolver. Thus, the power from the inverter will take the form of an alternating sinusoidal waveform at 60 hertz. An arc suppressor circuit is provided to protect the resolver and inverter from arcing during switching for non-resistive loads. A current detector circuit senses the inductive ring current at the load and protects the alternator from application of improper loads and a thermal breaker protects the alternator from load faults.
REFERENCES:
patent: 2736857 (1956-02-01), Klug
patent: 3351812 (1967-11-01), Cutler et al.
patent: 3393348 (1968-07-01), Porterfield et al.
patent: 3532949 (1970-10-01), Williams et al.
patent: 3727122 (1973-04-01), Hughes et al.
Gustin Jay W.
Young Thomas A.
Shoop William M.
Tenna Power Corporation
Wong Peter S.
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