G - Physics – 01 – R
Patent
G - Physics
01
R
324/70
G01R 21/00 (2006.01) G01R 19/165 (2006.01)
Patent
CA 1126822
B3422 SYSTEM FOR MONITORING ELECTRICAL ENERGY CONSUMPTION ABSTRACT OF THE DISCLOSURE An electronic monitoring circuit measures the amount of energy consumed by a system and displays the corresponding cost of the energy. An alarm circuit is triggered if the cost exceeds a predetermined amount over a given period of time. The monitoring circuit includes an electromagnetic coil which senses the magnitude of the input current and generates a d-c voltage having an amplitude corresponding to the current magnitude. The d-c voltage drives a voltage-controlled oscillator to generate an a-c signal having a frequency corresponding to the d-c voltage amplitude. The oscillator has been preset so that the generated a-c signal has a frequency representing a unit of cost of electrical power corresponding to the sensed current magnitude. A multivibrator generates a pulsed dlgital signal corresponding to the a-c signal frequency, each pulse indicating a unit of cost for the electrical power consumed. The pulses are accumulated in a series of decade counters which are connected through a decoder to a seven segment read-out unit for displaying the cumulative cost of the energy consumed. The counters are monitored by an alarm circuit which is triggered in response to the count exceeding a predetermined value in a given period of time. Reset circuits periodically returns the counters and alarm circuit to zero to begin a new monitoring period.
318095
Dupont Energy Management Corporation
Kirby Eades Gale Baker
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