Abb Schweiz Ag

Bilal Gerhard

John Daniel

Madhav Manjrekar

A method is specified for operating a charger ( ) for a voltage-maintaining device ( ), in which a rectifier ( ), connected to phase inputs (P , P ; P ) via a transformer ( ) with an electric AC voltage supply system ( ), of the charger ( ) is driven by means of a drive signal (S) formed from reference charging voltages (U ; U ; U ). Furthermore, a charging voltage (U ; U ; U ) for the corresponding phase (A; B; C) is generated at each phase input (P ; P ; P ) a substantially constant DC voltage (U ) being generated-on the DC voltage side of the rectifier ( ). Each charging voltage (U ; U ; U ) is generated in such a way that in the corresponding phase (A; B; C) a charging current (I ; I ; I ) is injected in a fashion substantially proportional to a phase system voltage (U ; U ; U ) of the corresponding phase (A; B; C) of the electric AC voltage supply system ( ). An apparatus for carrying out the method is also disclosed.

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Niederrohrdorf, Switzerland

Bilal Gerhard