Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1976-05-14
1977-10-25
Strecker, Gerard R.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324123R, 330 69, G01R 2106, G01R 1132
Patent
active
040558045
ABSTRACT:
A watt/watthour meter of improved accuracy and relatively lower cost than a conventionally designed device with similar 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. The watt output amplifier is a current input, current output amplifier which simultaneously functions as an active ripple filter. It directly couples the input signal to the inverting input and capacitively couples the input ripple to the non-inverting input of the amplifier's op-amp. The output load, which is externally connected between the inverting input and the output of the op-amp, does not have a common with the internal ground and effectively floats with the ripple.
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patent: 3532983 (1970-10-01), Knanishu
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patent: 3794917 (1974-02-01), Martin et al.
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Leighton, H. N. Controlled Linearity Phase Shifter, IBM Tech. Disc. Bull, vol. 14, No. 5, Oct. 1971, pp. 1402, 1403.
Smith, John I. Modern Operational Circuit Design, John Wiley and Sons, 1971, Chap VIII, pp. 64-75, TK7867.56.
Foster Frank H.
Strecker Gerard R.
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