Microprocessor controlled fan
First Claim
1. A system for controlling a fan particularly suited for being mounted in a window, said fan comprising a motor responsive to a control signal and excited by a power source with first and second terminals and having a predetermined frequency, said system comprising:
- (a) means for selecting a desired temperature and providing a first electrical signal representative thereof;
(b) means for sensing an actual temperature and providing a second electrical signal representative thereof;
(c) means for receiving, sampling and interpreting said first and second electrical signals, said interpreting including determining the difference between said first and second electrical signals and generating said control signal to said motor when said difference therebetween exceeds a predetermined value;
wherein said means for selecting a desired temperature and said means for sensing an actual temperature each include means for converting said respective electrical signals into a corresponding pulse count.
2 Assignments
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Accused Products
Abstract
A system includes a microcontroller for controlling a fan particularly suited to be mounted in a window. The microcontroller monitors and responds at relatively high sampling rates to the actual and desired temperatures of the room associated with the fan. The microcontroller senses a predetermined difference between the desired and actual temperatures to generate the speed, forward-reverse drive and/or on-off controls of the fan and so that the operation of the fan closely tracks the temperature conditions of the room being serviced by the fan.
43 Citations
27 Claims
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1. A system for controlling a fan particularly suited for being mounted in a window, said fan comprising a motor responsive to a control signal and excited by a power source with first and second terminals and having a predetermined frequency, said system comprising:
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(a) means for selecting a desired temperature and providing a first electrical signal representative thereof; (b) means for sensing an actual temperature and providing a second electrical signal representative thereof; (c) means for receiving, sampling and interpreting said first and second electrical signals, said interpreting including determining the difference between said first and second electrical signals and generating said control signal to said motor when said difference therebetween exceeds a predetermined value; wherein said means for selecting a desired temperature and said means for sensing an actual temperature each include means for converting said respective electrical signals into a corresponding pulse count. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27)
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11. A system for controlling a fan particularly suited for being mounted in a window, said fan comprising a motor responsive to a control signal and excited by a power source with first and second terminals and having a predetermined frequency, said system comprising:
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(a) means for selecting a desired temperature and providing a first electrical signal representative thereof; (b) means for sensing an actual temperature and providing a second electrical signal representative thereof; (c) means for receiving, sampling and interpreting said first and second electrical signals, said interpreting including determining the difference between said first and second electrical signals and generating said control signal to said motor when said difference therebetween exceeds a predetermined value; wherein said means for selecting a desired temperature and said means for sensing an actual temperature comprises; (a) a divider network comprised of a plurality of stages of a predetermined number with each stage including a resistor and the first stage thereof also including a thermostat, said divider network having opposite ends connected to opposite voltage potentials; (b) a serial arrangement of a thermocouple device and a resistor having a node therebetween; (c) a plurality of comparator devices with positive and negative inputs and of being a number which is less than said predetermined number of said divider network, each of said comparator devices having an output stage having one end of a resistor connected thereto and with the other end of said resistor connected to one of said opposite voltage potentials of said divider network, each of said output stages further having a resistive network comprising at least one resistor having a first end connected to said output stage and its second end connected to one of said positive and negative inputs, said other positive and negative inputs respectively connected to one of the output stages of said divider network, said node between serial arrangement of said thermocouple device and said resistor having means for being connected to said first end of said resistor of said resistive network, said output stage of each of said comparator devices connected to said means for receiving, sampling and interpreting. - View Dependent Claims (12)
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Specification