Overvoltage protection circuit

Details Overvoltage protection circuit Overvoltage protection circuit

1990-05-07

1992-05-05

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361160, 361166, 361170, G05B 902, F02D 4130

Patent

active

051113538

ABSTRACT:
Overvoltage protection circuit (10) has a power transistor (11) that drives an inductive load (19). A resistor (16) is connected between an output electrode (14) of the transistor and a control electrode (12) of the transistor, and a constant current source (18) is also connected to the control electrode. The resistor and constant current source determine an effective zener voltage to limit the maximum voltage which can exist at the transistor output electrode (14), and this is accomplished without the use of a zener diode while utilizing a minimum number of components. This effective zener diode voltage can be readily adjusted by adjusting either the magnitude of the resistor (16) or the constant current source (18).

REFERENCES:
patent: 3185916 (1965-05-01), Brewster
patent: 3579039 (1971-05-01), Damon
patent: 4449158 (1984-05-01), Taira
patent: 4618908 (1986-10-01), Anttila
patent: 4736145 (1988-04-01), Sakurai et al.
SGS-Thomson Microelectronics L530, pp. 71-78, May, 1989.
SGS-Thomson Microelectronics VB020, pp. 85-89, Jun., 1989.

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