Phase-controlled reversible power converter presenting a control

Details Phase-controlled reversible power converter presenting a control Phase-controlled reversible power converter presenting a control

1989-09-29

1992-04-28

Beha, Jr., William H.

Electricity: power supply or regulation systems

For reactive power control

Using converter

307 45, 323247, 330 10, 363163, G05F 170

Patent

active

051091852

ABSTRACT:
A universal phase-controlled reversible power converter having one transformer with multiple windings (i) couples a fixed d.c. voltage to an associated transformer winding through a fixed port having switches controlled for switching by fixed-phase signals, and (ii) couples any number of voltages having any waveform(s) whatsoever each to an associated transformer winding each through an associated variable port that has a filter with an inductor and controllable switches. Variable-phase switching control signals control the variable ports to produce any desired three-state demodulated waveform. A three-state demodulated waveform is filtered to present (i) a corresponding counter emf of any desired waveform to an input source or power, or (ii) any desired output waveform to a sink of power. Controllably producing the counter emf as a picture-of-the-line-input-voltage makes the load factor of the power converter, and all its loads, unity. Controllably producing the counter emf to either lead or lag an input power waveform gives the power converter a correspondingly controllable power factor, and permits it to serve as a power factor corrector. Controllably producing the counter emf as a pure sinusoid causes the power converter to reduce distortion on an a.c. power grid to which it is connected.

REFERENCES:
patent: 3517300 (1970-06-01), McMurray
patent: 3742336 (1973-06-01), Bedford
patent: 3896366 (1975-07-01), Onogi
patent: 3959719 (1976-05-01), Espelage
patent: 3959720 (1976-05-01), Bose et al.
patent: 3982167 (1976-09-01), Espelage
patent: 4479175 (1984-10-01), Gille et al.
patent: 4719550 (1988-01-01), Powell
patent: 4772994 (1988-09-01), Harada et al.

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