| 摘要 |
<p>1. Remote control device for heating apparatuses connected to alternating current supply means, which device comprises : - a central transmitter (20) comprising means (21) of detecting the zero-crossing of the supply voltage, a capacitor (26) connected in series with a switching device (25) to the terminals of the supply means, a circuit (27, 28) for charging the capacitor (26) interposed between the latter and one of the terminals of the supply means to enable charging of the capacitor after each opening of the switching circuit, and a pulse-coded information generator (22, 23, 24) synchronised by the detector to control the closing of the switching circuit in response to a pulse produced by the generator at a zero-crossing of the supply voltage, and - a receiver (30) connected to each apparatus and comprising means (32) of detecting the pulses at the zero-crossing of the supply voltage and a decoding circuit (33, 37) connected to the pulse detector to supply an identification signal when the information transmitted is identified, characterized in that - a filtering circuit (15) is interposed between the supply means and a distribution network (12) to which the supply means is connected so as to prevent the pulses (14) produced by the transmitter (20) from propagating in the network, - the pulse generator (22, 23, 24) generates periodical pulse trains, each consisting of pulses (13) of predetermined period (T3) equal or multiple of the half-period of the supply voltage, the period (T2) of the pulse trains being at least equal to several scores of times their duration (D2), and - the decoding circuit comprises a coincidence circuit (37) producing a signal (18) in response to the detection of at least two pulses separated by a time interval equal to said predetermined period (T3) of the pulses of each train.</p> |
