Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1974-12-13
1976-08-17
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
G01R 2100
Patent
active
039756823
ABSTRACT:
A watt/watthour meter of improved accuracy and relatively lower cost than a conventionally designed device with smilar specifications. A current proportional to instantaneous power is obtained from a current-voltage multiplier circuit and is maintained as a current signal through amplifying and filtering and through the watt output load and through integrating in the watthour section. The watthour integrator uses a charge compensation integrator circuit to integrate one of the watt signal currents and it can integrate in either direction corresponding to power in or power out. This can be accomplished because circuitry is disclosed to provide a current pulse having a precise magnitude and in either of two alternative, opposite current flow directions. The magnitude of the current pulse in both directions is referenced from the same reference voltage and reference resistance and its duration is referenced from the same timer so that an identical quantum of charge may be either added to or removed from the integrator depending upon the direction of power flow.
REFERENCES:
patent: 3470471 (1969-09-01), Moore
patent: 3731190 (1973-05-01), Schwendtner
patent: 3775683 (1973-11-01), Barta et al.
patent: 3794917 (1974-02-01), Martin et al.
Esterline Corporation
Foster Frank H.
Strecker Gerard R.
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