H - Electricity – 02 – H
Patent
H - Electricity
02
H
H02H 7/085 (2006.01) H02H 1/06 (2006.01) H02H 3/08 (2006.01) H02H 6/00 (2006.01)
Patent
CA 2050223
A device protects an electric load, such as a motor, from excessive current levels. The current flows from a source to the load through a switch and a primary winding of a current sensing transformer. The voltage across a secondary winding of the current sensing transformer is rectified to produce a voltage which is measured to determine the level of current through the load. The voltage across the secondary winding also powers components of the device. In a first mode of operation, current from the secondary winding is applied to charge a power supply capacitor. In a second mode of operation the level of the rectified voltage is sensed to produce a sample of the level of the current flowing through the load. From this sample the change in temperature of the load since a previous sample is calculated and used to derive the present load temperature. When the present load temperature exceeds a defined threshold level, the switch is opened to disconnect the load from the electricity source.
Allen-Bradley Company Inc.
Shapiro Cohen
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