H - Electricity
02
M
321/22, 321/34,
H02M 7/515 (2006.01) H02M 7/48 (2006.01)
Patent
CA 1227533
Abstract Inverter In an inverter for the production of the voltages of a polyphase system, connections between each phase conductor and the terminals of a direct voltage source arrangement are closed and opened through controllable switches. The zero voltage, the crest voltage and at least one intermediate voltage lying between these voltages are tappable at the direct voltage source arrangement; for the staircase shaped approximation of a half sine 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 third time span, thereafter to the first intermediate voltage for a fourth time span and to the zero voltage for an immediately following fifth time span, which is 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 fourth time span to the terminal delivering the first intermediate voltage.
479587
Mitec Moderne Industrietechnik G.m.b.h.
Ridout & Maybee Llp
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