Apparatus for co-generation of electric power

Electric power conversion systems – Frequency conversion without intermediate conversion to d.c. – By semiconductor converter

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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.

REFERENCES:
patent: 3319147 (1967-05-01), Mapham
patent: 3431483 (1969-03-01), LaFuze
patent: 3493838 (1970-02-01), Gyugyi et al.
patent: 3707665 (1972-12-01), Gyugyi
patent: 3832625 (1974-04-01), Gyugyi
patent: 3896365 (1975-07-01), Corry
patent: 3921059 (1975-11-01), Birman et al.
patent: 4164785 (1979-08-01), Young et al.
patent: 4240135 (1980-12-01), Schaefer, III
patent: 4415848 (1983-11-01), Morishita
patent: 4419618 (1983-12-01), Gretsch
Gyugyi et al., Static Power Frequency Changers, 1976, pp. 21-24; 33-50; and 383-395.

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