Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Plural inputs
Patent
1985-10-02
1987-05-05
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Plural inputs
324142, 364483, G01R 2106
Patent
active
046635874
ABSTRACT:
A shift register is utilized to provide a 90.degree. delay in a pulse width modulated current signal to determine volt-amperes reactive. The shift register is associated with a clock that provides a preselected frequency that, in combination with the number of stages in the shift register, delays the pulse width modulated current signal by an amount equivalent to one-quarter period of the current waveform in the metered circuit. After delaying the pulse width modulated signal by 90.degree., the shifted signal is multiplied by a voltage signal that represents the voltage in the metered circuit and the resulting product signal is input to a voltage-to-frequency converter.
REFERENCES:
patent: 3226641 (1965-12-01), Miller
patent: 4124821 (1978-11-01), Petr
patent: 4182983 (1980-01-01), Heinrich et al.
patent: 4242634 (1980-12-01), Metcalf
patent: 4254376 (1981-03-01), Steinmuller
patent: 4315212 (1982-02-01), Gamoh
patent: 4368424 (1983-01-01), Miller
patent: 4463311 (1984-07-01), Kobayashi
patent: 4596951 (1986-06-01), Heinrich et al.
Karlsen Ernest F.
Lackey D. R.
Westinghouse Electric Corp.
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