Communications: electrical – Selective – Having indication or alarm
Patent
1980-11-21
1983-10-04
Robinson, T. A.
Communications: electrical
Selective
Having indication or alarm
G08G 100, H05B 3702, H03K 1914
Patent
active
044081804
ABSTRACT:
A circuit capable of reducing power consumed by all of the signal lights at a street intersection is presented. The circuit comprises activating switching means which activate the circuit. The circuit further includes timing current interruption means which are turned on by the activating means. The timing current interruption means inhibit the 24 volt, low voltage supply to the load switches of the selected signal lights thereby preventing the power normally supplied to the signal lights from being supplied to the signal lights while the low voltage supply is inhibited. A preferred mode of operation inhibits alternate cycles of the AC power so that only 30 or every other of the 60 cycles of AC power normally transmitted to the traffic signal light each second are actually transmitted to the traffic signal light. This reduction in power is at such a high frequency that at night time or at other times when the power is to be reduced, a normal human eye will not detect any substantial change such as flickering in the traffic signal light, but will only perceive a reduced intensity. The activating switching means are turned on, under normal operation parameters at night when because of the absence of sunlight, the drivers can see the traffic signal lights at a reduced intensity. The intensity of the traffic signal lights can be reduced by half or any other desired ratio or percentage.
REFERENCES:
patent: 3500455 (1970-03-01), Ross et al.
patent: 3787752 (1974-01-01), Delay
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