Electric power conversion systems – Frequency conversion without intermediate conversion to d.c. – By semiconductor converter
Patent
1985-12-11
1987-04-14
Salce, Patrick R.
Electric power conversion systems
Frequency conversion without intermediate conversion to d.c.
By semiconductor converter
363164, 323258, H02M 5257
Patent
active
046583467
ABSTRACT:
Apparatus for converting relatively high, variable frequency, variable amplitude electrical power into substantially constant amplitude and substantially constant, relatively lower frequency power of a preselected waveform. The power source signal is divided into a number of varying amplitude, same frequency segments. The segment having the amplitude nearest that of the preselected waveform is transmitted by a switching network during each of many time periods. The switching network is preferably controlled by a microprocessor that senses the amplitudes of the segments and compares them to the desired waveform amplitude as a function of time. The microprocessor provides control signals to the switching network in response to the comparison. Because the low frequency output signal is constructed with reference to a memorized signal, the output signal is particularly stable in spite of variations in the power source signal.
The power source may be a mechanical electrical generator driven by a high speed machine, such as a turbine, producing excess usable power. The generated electricity may be divided into segments by means of a number of taps on a winding of the generator or by a transformer having a multiply tapped secondary winding. By use of the invention, usable electrical power may be co-generated from an energy source conserving otherwise wasted energy.
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Gyugyi et al., Static Power Frequency Changers, 1976, pp. 21-24; 33-50; and 383-395.
Evans Larry W.
Hoff Marc S.
Kennecott Corporation
Plotecher Gary R.
Salce Patrick R.
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