Short circuit protection system

Details Short circuit protection system Short circuit protection system

1982-03-29

1984-02-14

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

364483, H02H 324

Patent

active

044320302

ABSTRACT:
An electrical system which is part of a control system for a heat pump is disclosed. In addition to other functions, the electrical system protects an AC power supply for the control system from a short circuit condition in an electrical load connected to the power supply. The electrical system includes a device for monitoring the voltage drop across the load and for generating an electrical clock signal only when the monitored voltage drop exceeds a selected level indicating no short circuit condition in the load, a microcomputer having an internal timer for receiving any generated clock signal, and relay means controlled by the microcomputer for operating switches to disconnect the AC power supply from the load when a short circuit condition is detected in the load.

REFERENCES:
patent: 3749944 (1973-07-01), Luebrecht
patent: 3769550 (1973-10-01), Lee
patent: 3836790 (1974-09-01), Becker
patent: 4027204 (1977-05-01), Norbeck
patent: 4287565 (1981-09-01), Haubner et al.
"One-Shot Serving as Missing Pulse Detector Spots Loss of AC Line Voltage Quickly"-Kraengel Electronic Design 5/79.
"Line Voltage Threshold Detector"-Stammely, IBM Technical Disclosure Bulletin, vol. 17, No. 8, 1/75.

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