Switching circuit for a remote control system
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United States of America Patent
Stats
-
Mar 22, 1983
Grant Date -
N/A
app pub date -
Feb 26, 1981
filing date -
Mar 5, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The switching circuit couples an appliance (1) to a power main (LN) via remotely controllable switching means (2) and is operable to change the state of the switching means (2) in response to a manual double switching of the appliance power switch so that the appliance can be manually switched ON after it has been remotely switched OFF. A capacitor (CAP1) generates from the mains voltage an alternating current signal of a phase differing from that of the mains voltage by an amount dependent on the external impedance across the output. The switching circuit monitors this phase difference and changes the state of the switching means (2) if it detects two phase difference changes exceeding a predetermined value in opposite senses within a predetermined time period, this being indicative of a manual double switching of the appliance power switch. The switching circuit does not operate spuriously for thermostatically controlled appliances nor in response to noise spikes.
First Claim
Family
International Classification(s)
- Non-US Classification not provided for expired patents
Cited Art Landscape
Patent Citation Ranking
- Citation Ranking not provided for expired patents
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