Operational timer circuit for monitoring a motor under load

Details Operational timer circuit for monitoring a motor under load Operational timer circuit for monitoring a motor under load

G - Physics

04

F

58/2

G04F 8/00 (2006.01) G04F 10/04 (2006.01) G07C 3/04 (2006.01)

Patent

CA 1278194

ABSTRACT Disclosed is a circuit for detecting and recording the cumulative time during which an electrical device is operating under load, the device current being at a first predetermined level when the device is on and at or above a second predetermined level when the device is under load. The circuit comprises a device current detection circuit connected in series with the device for receiving current through the device and outputting a voltage proportional to current through the device. An amplifier has an input connected to receive the voltage from the device current detection circuit and has an output connected to an input of a voltage level detector, said voltage level detector having an output connected to one input of a gate and providing an enabling signal to the one gate input when the device current is at least at the second predetermined level. The gate has a second input connected to receive pulses from a source of clock pulses and has an output connected to an input of a counter, the counter having an output connected to a display means.

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