Shutter control system
First Claim
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1. A light controlling shutter system comprising:
- drive means for placing said shutter in a given light passing state in response to an applied drive input signal,first control means responsive to the intensity of light passed by said shutter for generating a first drive means input signal having one value for opening the shutter in response to a decrease in intensity of light passed by said shutter and a second value for closing the shutter in response to an increase in intensity of light passed by said shutter, andsecond control means responsive to the intensity of said light to be controlled for generating a second drive means input signal having a third value when said light to be controlled has a level below a given threshold to close the shutter, said first and second control means including means for overriding said first input signal with said second input signal when said second input signal has said third value.
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Abstract
A skylight shutter is driven by a battery-powered d.c. motor through transistor switches operated by Schmitt triggers. A voltage dividing network derives the trigger signals by comparing the resistance of a photoresistor and a variable resistance, whose value determines the direction and degree the shutters are moved. A night sensor operates the Schmitt triggers independently of the remaining circuit for placing the shutters in a closed position to minimize radiation losses during evening hours.
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Citations
8 Claims
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1. A light controlling shutter system comprising:
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drive means for placing said shutter in a given light passing state in response to an applied drive input signal, first control means responsive to the intensity of light passed by said shutter for generating a first drive means input signal having one value for opening the shutter in response to a decrease in intensity of light passed by said shutter and a second value for closing the shutter in response to an increase in intensity of light passed by said shutter, and second control means responsive to the intensity of said light to be controlled for generating a second drive means input signal having a third value when said light to be controlled has a level below a given threshold to close the shutter, said first and second control means including means for overriding said first input signal with said second input signal when said second input signal has said third value. - View Dependent Claims (2, 3, 4, 5)
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6. A light controlling shutter system comprising:
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first and second terminals for receiving an applied voltage, light sensor means and a variable resistance serially connected between said terminals, said sensor means having a resistance which varies as a function of light intensity, means coupled to said sensor means and said resistance for producing first and second signals manifesting the respective magnitudes of the resistance of said sensor means and variable resistance, switch means aternatively having a first state for providing a clockwise motor drive signal, a second state for providing a counterclockwise motor drive signal and a third neutral state in response to a switch control signal applied as an input thereto, and trigger means responsive to said first and second signals applied as inputs thereto for providing said switch control signal as an output thereof, said switch control signal representing the relative magnitude of said resistances. - View Dependent Claims (7, 8)
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Specification