Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1977-12-19
1979-04-03
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
G01R 2106
Patent
active
041479785
ABSTRACT:
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 digital 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.
REFERENCES:
patent: 3517311 (1970-06-01), Wasielewski et al.
patent: 3900794 (1975-08-01), Bell
patent: 3942110 (1976-03-01), Milkovic
patent: 3953795 (1976-04-01), Brunner et al.
patent: 4056774 (1977-11-01), Shum
patent: 4079313 (1978-03-01), Callan
patent: 4080568 (1978-03-01), Funk
Kusui et al., Metering Apparatus & Tariffs for Electricity Supply, IEE, Conference Publication No. 92, Sep. 1972, pp. 329-334.
Friedl et al., Published IEE Lecture, Paper No. 117, Sep. 1972, 6 pages.
Dupont Energy Management Corporation
Krawczewicz Stanley T.
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