Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1979-07-06
1982-02-09
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324107, 324111, G01R 2106, G01R 1116
Patent
active
043152120
ABSTRACT:
An electronic watthour meter comprising: a pulse width modulation circuit for subjecting a voltage signal, proportional to the load voltage of a power supply line, to pulse width modulation to obtain a pulse width duty cycle signal; a multiplication circuit in which a plurality of analog switches are selectively operated, with the aid of the pulse width duty cycle signal, so that positive and negative DC voltages equal in absolute value are obtained from the product of a voltage signal, proportional to the consumption current of the power supply line, and the pulse width duty cycle signal attributing to the voltage signal proportional to the load voltage; and a dual-slope type frequency conversion circuit for converting the positive and negative DC voltages into a frequency signal.
REFERENCES:
patent: 2302474 (1942-11-01), Rich
patent: 2615063 (1952-10-01), Brown
patent: 4217545 (1980-08-01), Kusui et al.
Karlsen Ernest F.
Tokyo Shibaura Denki Kabushiki Kaisha
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