Switching circuit for a remote control system

Details Switching circuit for a remote control system Switching circuit for a remote control system

1981-02-26

1983-03-22

Griffin, Donald A.

Electrical transmission or interconnection systems

Switching systems

Plural switches

H01N 1964

Patent

active

043777546

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.

REFERENCES:
patent: 2835830 (1958-05-01), Rathenau
patent: 3287722 (1966-11-01), Craig

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