FEHLERERKENNUNGSSCHALTUNG FUER PARALLEL AUF EINEN VERBRAUCHER SPEISENDE STROMVERSORGUNGSGERAETE

摘要

The invention relates to a fault recognition circuit for at least two power supplies feeding in parallel a user at an output side. The power supplies each have an electronic switch, a power transformer and a rectifier portion with a following filter element. In order to achieve short repair times, the respective down power supply is immediately identified after the outage of one of the parallel power supplies. For this purpose, a current transformer is provided which lies between the electronic switch and the power transformer. The load voltage of the current transformer is supplied to first a rectifier unit and the ac voltage component of the unfiltered dc voltage at the rectifier portion of the power pack units is supplied via a high pass filter to a second rectifier unit. The outputs of the rectifier units are connected to inputs of first and second comparators, and the other inputs of the comparators are connected with comparison voltages. The outputs of the first and second comparators are connected to the inputs of an evaluation circuit. The outputs of all evaluation circuits are connected to an external central power supply control situated, for example, in a data processing system. The central power supply control in turn influences a respective control and regulating unit of the electronic switch in the respective power supply.