Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Patent
1985-04-17
1987-08-04
Beha, Jr., William H.
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
307 66, H02M 112, H02M 744
Patent
active
046850430
ABSTRACT:
In an inverter for the generation of the voltages of a multi-phase system, connections between each phase conductor and the output terminals of a d.c. power supply are closed and opened by means of controllable switches. The zero voltage, the crest voltage and at least one intermediate voltage laying between these voltages are tappable at the d.c. power supply; for the staircase-shaped approximation of a sine half wave, each phase conductor is connected to the zero voltage for a first time span, to the intermediate voltage for an immediately following second time span, thereafter to the crest voltage for a fourth time span, thereafter to the first intermediate voltage for a sixth time span and to the zero voltage for an immediately following seventh time span, this sequence being repeated with alternating voltage signs; in order that no damaging countercurrents flow into the direct voltage source arrangement in the case of a phase displacement between current and voltage occurring by reason of a capacitive or inductive loading, two phase conductors are connected at the same time during the second and the sixth time span to the output terminal delivering the first intermediate voltage.
REFERENCES:
patent: 3391323 (1968-07-01), Ikeda
patent: 4467407 (1984-08-01), Asano et al.
Beha Jr. William H.
MITEC Moderne Industrietechnik GmbH
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