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Standard multilevel inverters offer high quality output voltages at small voltage steps even without using additional filter equipment. Voltages of separate converter stages can be added by series connection of transformers. However, the number of individual switches to be controlled precisely and at given sequence is a heavy burden for control. The hardware expenditure of standard circuits is rather...
A special four-level three-phase diode clamped inverter fed by a correspondingly adapted untypical three-phase rectifier with two typical transformers is presented. The three-level rectifier is formed by consecutive connection of three rectifiers under the circuit of Scott for the bi-phase orthogonal voltage received from corresponding windings of two three-phase transformers. The inverter is realized...
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