Device for sensing the operative status of electrical equipment

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Nonquantitative

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Details

307351, 324103P, 324140D, G01R 1916

Patent

active

040457320

ABSTRACT:
The operative status of an electrical apparatus unit such as a television receiver, incorporating an AC-DC converter, and drawing a substantial amount of current is sensed while differentiating from the usage of a lower amount of current, as when operating in a standby mode. The sensor distinguishes between the standby current waveform and a distinctly different current waveform generated when the AC-DC converter draws current in the mode in which full power is on. The sensor incorporates a reference current detector responsive to the mean of the absolute value of alternating current flowing through a power line to the electrical unit, and a peak value current detector responsive to the peak value of the periodic signal on the power line. A comparator circuit receives outputs from both detectors, and provides an output signal when the ratio therebetween is in excess of a predetermined value, this condition only applying when the AC-DC converter is operative. The comparator may comprise a differential amplifier which periodically triggers a pulse generator to maintain a selected signal level and activate a relay as long as the selected proportionality exists between the peak and mean values of the AC power signal.

REFERENCES:
patent: 2871447 (1959-01-01), Hall
patent: 3434053 (1969-03-01), McKee
patent: 3502983 (1970-03-01), Ingle et al.
patent: 3502993 (1970-03-01), Schurzinger
patent: 3732492 (1973-05-01), Geul
patent: 3777262 (1973-12-01), Vahlstrom et al.
patent: 3777263 (1973-12-01), Perron et al.
patent: 3867702 (1975-02-01), Tropie et al.
patent: 3885168 (1975-05-01), Matsuzaki

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