Photocontrol for electric lamps
First Claim
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1. A photocontrol system, comprising:
- a. circuit means having power supply terminals for connection with a source of electrical energy and load terminals for connection with an electrical load;
b. switch means connected in the circuit means to control supply of current to the load terminals;
c. electrical means controlling operation of said switch means;
d. solid state electronic timer means connected between the load terminals and comprising a pulse generator which generates pulses at a predetermined frequency, beginning when current is supplied to the load terminals, and counting means which count the pulses generated by the pulse generator and provide an output signal when a preset count has been reached after beginning counting;
e. control means connected to respond to said output signal by causing said electrical means to bring about opening of the switch means; and
f. photoelectric means respective to the intensity of ambient light to cause the electrical means to maintain the switch means open independently of said control means until the level of ambient light falls below a predetermined level,whereby when said power supply terminals are connected with a source of electrical energy and the intensity of ambient light falls below said predetermined level, said photoelectric means automatically cause said switch means to close and remain closed until said preset count is reached or the intensity of ambient light once more reaches said predetermined level, which ever is sooner, whereupon said switch means are automatically opened and remain open until the intensity of ambient light falls once more below said predetermined level.
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Abstract
An improved photocontrol system for electrical lamps comprising the combination of photoelectric means responsive to the intensity of the ambient light for controlling the turning the lamps on and off, and an electronic timer for turning off the lamps at a preset time interval, after they have been turned on.
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Citations
5 Claims
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1. A photocontrol system, comprising:
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a. circuit means having power supply terminals for connection with a source of electrical energy and load terminals for connection with an electrical load; b. switch means connected in the circuit means to control supply of current to the load terminals; c. electrical means controlling operation of said switch means; d. solid state electronic timer means connected between the load terminals and comprising a pulse generator which generates pulses at a predetermined frequency, beginning when current is supplied to the load terminals, and counting means which count the pulses generated by the pulse generator and provide an output signal when a preset count has been reached after beginning counting; e. control means connected to respond to said output signal by causing said electrical means to bring about opening of the switch means; and f. photoelectric means respective to the intensity of ambient light to cause the electrical means to maintain the switch means open independently of said control means until the level of ambient light falls below a predetermined level, whereby when said power supply terminals are connected with a source of electrical energy and the intensity of ambient light falls below said predetermined level, said photoelectric means automatically cause said switch means to close and remain closed until said preset count is reached or the intensity of ambient light once more reaches said predetermined level, which ever is sooner, whereupon said switch means are automatically opened and remain open until the intensity of ambient light falls once more below said predetermined level. - View Dependent Claims (2, 3, 4, 5)
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Specification