Patent ID: 6285570
Filing Date: 2001-09-04
Classification: H02J

Abstract:
Mains power supply unit for supplying consumers that are connected directly or by way of a voltage system converter to a direct voltage branch of the mains power supply unit, comprising a buffer capacitor that can be charged from the mains supply and that still supplies the direct voltage branch for a predetermined minimum period of time in the event of a failure or interruption in the mains supply; and dedicated charging circuit means for charging the buffer capacitor to a voltage that, regardless of the voltage fluctuations in the direct voltage branch, is substantially constant and substantially corresponds to the upper limit value of the direct voltage, to which limit value the mains power supply unit is configured, and the buffer capacitor can be connected onto the direct voltage branch by way of a controlled switch in the event of undervoltage in the mains supply or in the direct voltage branch.