An electronic fuse is intended to be triggered should the current from a load (LA) exceed a predetermined value. The load current is restricted first by a switch in series with the load, the switch being kept in a closed or open state by pulses from a pulse length modulator (PB). The pulse length of the modulator is controlled by a sensing circuit (AK) such that when the load current exceeds the predetermined value, the circuit sends a control signal varying as the load current, so that the closing time of the switch (OM) decreases with increasing load current. After a practically constant time the switch is thereafter set to a permanently open state.
申请公布号
WO8606223(A1)
申请公布日期
1986.10.23
申请号
WO1986SE00161
申请日期
1986.04.08
申请人
TELEFONAKTIEBOLAGET L M ERICSSON
发明人
AHL, ULF, PETER, LENNART;LUNDSTROEM, HANS, SVEN, GUSTAV