Electric lamp and discharge devices: systems – With radiant energy sensitive control means – Electric switch controlled by the radiant energy responsive...
Patent
1980-09-08
1982-12-07
La Roche, Eugene R.
Electric lamp and discharge devices: systems
With radiant energy sensitive control means
Electric switch controlled by the radiant energy responsive...
307117, 3071414, 250214AL, 315360, H05B 3702
Patent
active
043629709
ABSTRACT:
An energy conserving circuit for controlling supply of electrical power to various loads such as a street lamp or a hot water heater comprises a photoelectric device for starting a timer when a change from daylight to dark is sensed at sundown, and a load power control responsive to the timer to switch between power-off and power-on states. With a street lamp the timer and power control means are connected to switch the power control means to power-on state at the beginning of the delay period at sundown and later, well before sunrise, to switch to power-off state. In the case of a household hot water heater the switching of the power control to power-on state is delayed until the peak demand hours have ended after sundown. The photoelectric device will normally cause the power control to switch to power-off state at sunrise. But a second timer may be added which is responsive to the photoelectric device to start a second timing period ending after normal sunrise so that switching to power-off will occur if the photoelectric device does not or cannot respond to sunrise.
REFERENCES:
patent: 3261992 (1966-07-01), Coe
patent: 4180087 (1979-12-01), Meisner et al.
patent: 4198563 (1980-04-01), Elssner
patent: 4209728 (1980-06-01), Membreno
Grover James H.
La Roche Eugene R.
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