Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific quantity comparison means
Patent
1979-06-26
1985-03-05
Salce, Patrick R.
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific quantity comparison means
361 98, 330207P, H02H 720
Patent
active
045034788
ABSTRACT:
Two output transistors constituting a push-pull output amplifier circuit are connected in series between a power supply and a grounded point, and an output terminal is disposed at a point where the two output transistors are commonly connected. An operation detector circuit detects the operation of one output transistor. A level detector circuit detects a d-c voltage level at the output terminal. The two output transistors are driven by a drive circuit in a push-pull manner. The output of the operation detector circuit and the output of the level detector circuit control the drive circuit via a control circuit. When the operation detector circuit detected the fact that the operation of one output transistor has deviated beyond a predetermined detection level, the control circuit works to confine the operation of the abovementioned output transistor within a predetermined restriction level via the drive circuit. The power loss in the restriction level is smaller than the power loss in the detection level. During a period in which the output terminal is short-circuited to the grounded point in a d-c manner, the level detector circuit so controls the control circuit that the operation of the abovementioned one output transistor is confined within the restriction level.
REFERENCES:
patent: 3441864 (1969-04-01), Hafler
patent: 3691427 (1972-09-01), Honda et al.
patent: 3835412 (1974-09-01), Honda et al.
patent: 4053996 (1977-10-01), Schertz et al.
patent: 4146847 (1979-03-01), Otao et al.
patent: 4184187 (1980-01-01), Suzuki
Seki Kunio
Takeshita Ritsuji
Hitachi , Ltd.
Salce Patrick R.
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