Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1981-05-27
1984-07-31
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
328160, 364483, 364842, G01R 2106
Patent
active
044633114
ABSTRACT:
An electronic electric-energy meter comprises a delay time setting circuit connected to one of a voltage transformer and a current transformer connected to power lines for providing a necessary delay time and a delay circuit for which a delay time is set by the delay time setting circuit, the delay circuit delaying a pulse width duty cycle signal corresponding to a voltage applied from the voltage transformer. The pulse width duty cycle signal is formed by a pulse width modulation circuit connected to the voltage transformer. In the delay circuit connected to the pulse width modulation circuit, the duty cycle signal is delayed by the delay time set by the delay time setting circuit. In a time division multiplying circuit connected to the delay circuit, the delayed signal is multiplied by a current signal from the current transformer, thereby forming a signal proportional to electric power. The electric power signal is integrated by an integration circuit connected to the time division multiplying circuit, whereby a signal proportional to electric energy is obtained. The electric energy signal is converted into a display signal in a processing circuit connected to the integration circuit. On the basis of the display signal, a display circuit connected to the processing circuit displays the electric energy measured.
REFERENCES:
patent: 4217545 (1980-08-01), Kusui et al.
patent: 4408283 (1983-10-01), Kovalchik
Karlsen Ernest F.
Tokyo Shibaura Denki Kabushiki Kaisha
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