Device for protecting semiconductor circuits against transients

Details Device for protecting semiconductor circuits against transients Device for protecting semiconductor circuits against transients

1990-05-02

1992-04-14

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 56, 361 89, 323223, 323284, H02H 904

Patent

active

051053241

ABSTRACT:
A series of Zener diodes (25) and an electronic power switch, such as an IGBT (18), are connected across a power supply. A circuit including a resistor (20) in series on the electronic switch, a threshold device (36, 38) connected to the resistor and a ramp generator with multiplier (40, 42, 44, 46, FIG. 2) or a thermal sensor (50, 44, 46 FIG. 3) detect the energy level dissipated in the electronic power switch when a transient occurs when the level exceeds a present value, the circuit supplies an output signal to a monostable circuit (26, 28, 48) to drive the electronic power switch with low resistance conditions for a preset time starting from the occurrence of the output signal. Another threshold device, connected to a resistor (30, 32), preferably senses the instantaneous power dissipated in the electronic switch to control the monostable circuit when the instantaneous power is higher than a preset threshold.

REFERENCES:
patent: 3903475 (1975-09-01), Mokrani
patent: 4330809 (1982-05-01), Stanley
patent: 4589049 (1986-05-01), Krumrein
patent: 4878034 (1989-10-01), Gross

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