Circuit for limiting the output voltage of a power transistor

Details Circuit for limiting the output voltage of a power transistor Circuit for limiting the output voltage of a power transistor

1995-08-30

1997-02-25

Tran, Toan

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Amplitude control

327439, 327428, 327478, 327313, H03K 508, H03K 1700

Patent

active

056062788

ABSTRACT:
A circuit for limiting the output voltage from a power transistor connected in series with a resonant load between a voltage supply and a voltage reference, ground, is disclosed. The circuit includes a semiconductor junction element, in particular a diode of the SCR type, having an anode terminal connected to the voltage supply, a cathode terminal connected to a common circuit node between the power transistor and the resonant load, and a control terminal connected to a reference voltage of predetermined value. The reference voltage can be constructed by using a resistor connected in series with a diode across the voltage supply. The SCR diode is constructed using the parasitic PNP-NPN transistors which exist in the structure of the power transistor.

REFERENCES:
patent: 3662184 (1972-05-01), Johnson
patent: 4458290 (1984-07-01), Miyashita
patent: 4642491 (1987-02-01), Kenney et al.
patent: 5001373 (1991-03-01), Bator et al.
patent: 5021694 (1991-06-01), Toshiro et al.
patent: 5075568 (1991-12-01), Bilotti et al.
patent: 5189317 (1993-02-01), Palara et al.
patent: 5347169 (1994-09-01), Preslar et al.

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