Auxiliary excitation circuit for phased transformers

Details Auxiliary excitation circuit for phased transformers Auxiliary excitation circuit for phased transformers

H - Electricity

02

M

H02M 7/515 (2006.01)

Patent

CA 2068631

ABSTRACT AN AUXILIARY EXCITATION CIRCUIT FOR PHASED TRANSFORMERS A novel electrical inverter includes a source of direct current (DC) signals, a plurality, N, of addressable electrical switching devices where N does not equal two configured in parallel to receive signals from the DC source. The electrical switching devices generate a plurality of output signals phased relative to one another. An output transformer has a plurality of parallel configured input inverter windings sets for receiving and transforming a respective one of the phased electrical switching device output signals and a plurality of serially configured output winding sets providing three phased fundamental signals as the sum of the transformed signals. The inverter is characterized by an auxiliary excitation circuit having a plurality of low voltage AC signal sources each configured with auxiliary windings sets and a series reactor and each for providing excitation signals to a plurality auxiliary winding sets each configured in parallel with an identical to a respective one of said output transformer input winding sets.

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