Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Polyphase
Patent
1988-10-14
1989-08-29
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Polyphase
324111, 324120, 324142, 364575, 364811, 364483, G01R 100, G01R 2106
Patent
active
048620742
ABSTRACT:
An electronic circuit arrangement for producing an output signal representative of the average value of an alternating voltage in a power transmission system, composed of: at least one circuit unit composed of a pulse width modulator (6) connected to derive, from the alternating voltage, a train of pulses modulated in width as a function of the amplitude of the alternating voltage and with a defined phase relation to the alternating voltage, an electronic circuit (4,8) connected to derive, from the alternating voltage, an alternating signal which varies in frequency with the alternating voltage and which has the defined phase relation to the alternating voltage, and a signal multiplying device (14) connected to receive the train of pulses modulated in width and the alternating signal for multiplying the pulses and the alternating signal to produce a product signal having an amplitude proportional to the average magnitude of the alternating voltage; and a signal to frequency converter (16) connected to derive from the product signal a train of output pulses having a repetition rate proportional to the amplitude of the product signal and constituting the output signal (18).
REFERENCES:
patent: 4110834 (1978-08-01), Altwein
patent: 4182983 (1980-01-01), Heinrich et al.
patent: 4596951 (1986-04-01), Heinrich et al.
patent: 4743843 (1988-05-01), Tada
Eisenzopf Reinhard J.
Nguyen Vinh P.
Studebaker B. R.
Westinghouse Electric Corp.
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