Shunt regulator with shutdown protection to prevent excessive po

Details Shunt regulator with shutdown protection to prevent excessive po Shunt regulator with shutdown protection to prevent excessive po

1999-03-15

2000-10-31

Sherry, Michael J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Voltage regulator protective circuits

361 78, 361 87, 361 939, H02H 700

Patent

active

061411930

ABSTRACT:
A circuit (hereinafter "auto-shutoff regulator") for regulating the power provided to a load automatically opens and closes a switch (hereinafter "protection switch") to keep itself from being damaged by excessive power dissipation. The auto-shutoff regulator includes: (1) a shunt regulator coupled in parallel with the load and a power supply, and (2) another circuit (hereinafter "overpower detector") that monitors the power dissipated by the shunt regulator. The overpower detector has a control line (hereinafter "power shutoff line") that is coupled to the protection switch. When the power dissipated in the shunt regulator exceeds a predetermined threshold, the overpower detector drives a signal active on the power shutoff line, thereby to open the protection switch. Opening of the protection switch shuts off the supply of power to the shunt regulator, thereby to protect the shunt regulator from damage caused by excessive power dissipation. The overpower detector is also responsive to the voltage on a line coupled to the power supply. When the voltage falls below a threshold value, the overpower detector gets reset and drives the signal on the power shutoff line inactive, thereby to close the protection switch and restore the supply of power to the shunt regulator.

REFERENCES:
patent: 4127885 (1978-11-01), Adam et al.
patent: 4390829 (1983-06-01), Jarrett
patent: 4717867 (1988-01-01), Forehand
patent: 4899098 (1990-02-01), Gariboldi
patent: 5260644 (1993-11-01), Curtis
patent: 5444358 (1995-08-01), Delepaut
patent: 5465188 (1995-11-01), Pryor et al.
patent: 6023155 (2000-02-01), Kalinsky et al.

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