POWER SUPPLY SYSTEM AND METHOD

摘要

A power supply system S comprising a power processor (1), having a power input (2) and an AC power output (3) with a nominal voltage VN and a nominal current IN, and a power supply safety circuit (6) connected in parallel to said power processor (1) between said power input (2) and said AC power output (3). The purpose of the power supply safety circuit (6) is to provide an additional current in case of a short circuit condition downstream of the AC power output (3), so as to trigger the opening of an individual circuit breaker (4) connected to the short circuited load (5). For this purpose the power supply safety circuit (6) comprises a bidirectional switch (7), control means (12) for closing said bidirectional switch (7) after detecting a short circuit condition downstream of the AC power output (3) and a current limiter (9), preferably an impedance, connected in series to said bidirectional switch (7) to limit the current that can flow through the power backup circuit (6) to a maximum current of aINout wherein has a value between 5 and 20, preferably between 7 and 13, and most preferably about 10. The invention also comprises a method of operation of said power supply system S.