H - Electricity – 02 – J
Patent
H - Electricity
02
J
342/2, 325/32, 3
H02J 13/00 (2006.01)
Patent
CA 1165390
ABSTRACT SWITCHING CIRCUIT FOR A REMOTE CONTROL SYSTEM The switching circuit couples an appliance to a power main (LN) via remotely controllable switching means and is operable to change the state of the switching means in response to a manual double switching of the appliance power switch so that the appliance can be manually switched ON after is 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 if it detects two phase difference changes exceeding a predetermined value in opposite senses within a pre- determined time period, this being indicative of a manual double switching of the appliance power switch. The switching circuit does not operate spuriously for thermo- statically controlled appliances nor in response to noise spikes.
372270
Pico Electronics Limited
Ridout & Maybee Llp
LandOfFree
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