Circuit assembly and method for providing electric power for large DC loads

A circuit arrangement for providing electrical power for at least one DC load, in particular for at least one electrolyser cell, from at least one alternating current source having a primary DC intermediate voltage circuit, which is connected via at least one DC/DC converter to a secondary DC intermediate voltage circuit, which supplies the at least one DC load with electrical power,

• wherein the primary DC intermediate voltage circuit is supplied with electrical power of the alternating current source via two rectifiers connected in series such that a centre point tap is provided, at least one of the rectifiers connected to the primary DC intermediate voltage circuit has switchable circuit breakers and means are provided which can switch off at least a part of the switchable circuit breakers of this rectifier as soon as a fault state is detected in the DC load, in the secondary DC intermediate voltage circuit and/or in the at least one DC/DC converter, and means for limiting a DC output voltage of the associated rectifier are provided between the centre point tap of the primary DC intermediate voltage circuit and at least one DC potential of the primary DC intermediate voltage circuit, which can limit the DC output voltage of at least one of the rectifiers connected in series in the event of a fault state in the DC load, in the secondary DC intermediate voltage circuit and/or in at least one of the DC/DC converters.