초록 ▼

A solid state power controller is provided with an output circuit having a transistor which is connected between a pair of output terminals. Base current to the transistor is provided by a drive circuit which includes a pair of series connected diodes that provide biasing to offset the drive circuit

A solid state power controller is provided with an output circuit having a transistor which is connected between a pair of output terminals. Base current to the transistor is provided by a drive circuit which includes a pair of series connected diodes that provide biasing to offset the drive circuit and output transistor base voltage drops. Load current is sensed and a DC bias current is supplied to the diode pair, with the DC bias current being proportional to the load current. For bi-directional operation, a second output transistor is connected in series with the first output transistor and a pair of reverse series connected diode are connected in a circuit branch which parallels the two output transistors. Junction points between the output transistors and the reverse series connected diode circuit branch are connected together to provide for bidirectional load current flow.

대표청구항 ▼

A solid state power controller comprising: an output circuit stage including a first transistor, having a base and a first main conduction path between a collector and an emitter; means for electrically connecting said collector to a first output terminal; means for electrically connecting said emit

A solid state power controller comprising: an output circuit stage including a first transistor, having a base and a first main conduction path between a collector and an emitter; means for electrically connecting said collector to a first output terminal; means for electrically connecting said emitter to a second output terminal; a drive circuit including a pair of diodes electrically connected in series with each other in a first circuit branch, a first end of said first circuit branch being electrically connected to said collector; a bias current supply connected to supply a DC bias current to said first circuit branch; said drive circuit further including means for electrically connecting a second end of said first circuit branch to said base of said first transistor; means for producing a current signal proportional to a load current flowing in said output circuit stage; and said bias current supply being responsive to said current signal such that said DC bias current is proportional to said current signal.