Composite transistor device with over-current protection

Details Composite transistor device with over-current protection Composite transistor device with over-current protection

1987-11-23

1988-12-06

LaRoche, Eugene R.

Amplifiers

With semiconductor amplifying device

Including protection means

330207P, H02H 720

Patent

active

047898429

ABSTRACT:
A composite transistor device having over-current protection is disclosed, and particularly a device for protecting Darlington configuration power transistor devices. The over-current protection circuit operates to clamp the base-emitter potential of the exciter transistor thus causing the power output transistor to maintain a power output below a predetermined threshold value. This allows the control of the power output intensity so as to avoid damage to the circuit, and with a minimum of power losses due to active voltage losses.

REFERENCES:
patent: 4321648 (1982-03-01), Kaplan
patent: 4374364 (1983-02-01), Henery et al.

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