Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1998-05-29
1999-10-26
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327 77, G05F 110
Patent
active
059735511
ABSTRACT:
A detection circuit detects an abnormal current which flows through a first output transistor. In this event, the first output transistor is connected to an external power supply via a load resistor. The above detection circuit mainly includes a second transistor, a constant current supply, a third transistor, a fourth transistor, and a comparator circuit. The constant current supply supplies a constant current into the second transistor. Further, the third transistor is connected to the first output transistor and performs an ON-OFF operation in synchronism with the first output transistor. On the other hand, the fourth transistor is connected to the third transistor in serial and performs the ON-OFF operation opposite to the first output transistor. Moreover, the comparator circuit has a first input and a second input. In this event, a first connection point between the second transistor and the constant current supply is connected to the first input while a second connection point between the third transistor and the fourth transistor is connected to the second input.
REFERENCES:
patent: 5113089 (1992-05-01), Osawa
patent: 5767545 (1998-06-01), Takahashi
patent: 5796278 (1998-08-01), Osborn et al.
patent: 5892389 (1999-04-01), Lai
patent: 5903422 (1999-05-01), Hosokawa
patent: 5905389 (1999-05-01), Alleven
NEC Corporation
Tran Toan
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