| 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.
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