ELECTRONIC CURRENT INTERRUPTER INCLUDED IN A DC DISTRIBUTION SYSTEM

摘要

An electronic current interrupter included in a DC distribution system contains a transistorized power circuit (EK), a threshold circuit (JF), a time circuit (TK) and a holding circuit (HK). In one embodiment, the power circuit comprises a power transistor (T1) connected in series with the load and with a resistor (R1) in the threshold circuit. There is a current-limiting path containing a transistor (T2) and a current-limiting resistor (R4) in parallel with a power transistor (T1). When the load current exceeds a given value, the threshold circuit sends a voltage blocking the power transistor (T1) simultaneously as the transistor (T2) in the current-limiting path becomes conductive. After a given time ( DELTA t), determined by the time circuit (TK), the holding circuit sends a voltage which also blocks the transistor (t2) in the current-limiting path, and the power circuit (EK) becomes entirely non-conductive to the load current.