Electrical supply system for outputting voltage to load has d.c. current converter with controlled switch elements and series regulator for outputting voltage to load lower than input voltage

摘要

The system is switchable from one power supply to another. It has a d.c. current converter with a first switch element for applying an input voltage to the load, a second switch element for connecting the load to earth and a control circuit for controlling the switch elements if a first selection signal is input and a series regulator for outputting a voltage to the load lower than the input voltage if a second selection signal is input. The system is switchable from one power supply to another. It has a d.c. current converter (1) with a first switch element for applying an input voltage to the load (3), a second switch element for connecting the load to earth and a control circuit for controlling the switch elements when a first selection signal (EN1) is input so that the second switch element is switched on m times in a step period in which the first switch element is switched on n times, where n is a defined integer and m is between 0 and n and increases with each step period. It also has a series regulator (2) for outputting a voltage to the load lower than the input voltage if a second selection signal (EN2) is input.