Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1996-07-12
1998-11-03
Cunningham, Terry
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327538, 323316, G05F 110
Patent
active
058314717
ABSTRACT:
A dc-stabilized power circuit which has a PNP-type output transistor that is connected between input and output terminals, a base-driving circuit for controlling the driving current of the base of the output transistor in response to the difference between a voltage obtained by voltage-dividing the output voltage from the output terminal and a reference voltage that has been preliminarily determined, and a driving-current suppressing circuit for detecting a voltage between the input and output terminals and for suppressing a driving current released by the driving-current supplying means based upon the result of the detection. The greater the input-output voltage, the further the driving-current suppressing circuit suppresses the driving current from the base-driving circuit to the output transistor, thereby suppressing the output current. Thus, in a dc-stabilized power circuit of a low-loss type which has no current-detecting resistor connected in the output line and which is provided with a control circuit that is constructed as an integrated circuit and that supplies a driving current to the base of the output transistor in response to the output voltage, the power loss due to the output transistor is suppressed to not more than a predetermined level; therefore, it is possible to prevent damage to the output transistor beforehand.
REFERENCES:
patent: 4885477 (1989-12-01), Bird et al.
patent: 4928056 (1990-05-01), Pease
patent: 5376840 (1994-12-01), Nakayama
patent: 5467052 (1995-11-01), Tsukada
patent: 5493234 (1996-02-01), Oh
Hitachi HA17800P Series (Semiconductor Data Book: Industrial Linear IC, Interface-Use IC) (Published in Mar. 1982, pp. 100-103.).
Nakajima Akio
Satoh Isao
Conlin David G.
Cunningham Terry
Daley, Jr. William J.
Sharp Kabushiki Kaisha
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