Fuse loss indicating circuit

Details Fuse loss indicating circuit Fuse loss indicating circuit

1982-09-29

1985-11-19

Rowland, James L.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

340638, 340639, 361 23, H02H 504, G08B 2100

Patent

active

045546070

ABSTRACT:
The present invention relates to a fuse loss indicating system for monitoring the condition of a plurality of fuses in an electric circuit. The indicating system includes a plurality of individual indicator circuits, one for each fuse to be monitored. Each indicator circuit includes an optical isolator for electrically isolating the indicator circuit from the monitored circuit. When a monitored fuse blows, the associated optical isolator triggers a flip flop to generate a fuse loss signal to cause a warning LED to light and alert an operator as to which fuse has blown. In its preferred embodiment, the fuse loss indicating system is utilized to monitor the fuses in an SCR motor bridge circuit. In this embodiment, the fuse loss system also generates a bridge disable signal when a fuse blows to cause a bridge lockout circuit to disable the gating signals to the SCR's, thereby disconnecting power from the motor.

REFERENCES:
patent: 3546692 (1970-12-01), Salzer
patent: 4038584 (1977-07-01), Tarchalski et al.
patent: 4041331 (1977-08-01), Westerman et al.
patent: 4063302 (1977-12-01), Donig et al.
patent: 4177668 (1979-12-01), Holmberg
patent: 4356481 (1982-10-01), Kuki

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