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7497386 |
Apparatus and methods for operating a gas valve
An apparatus for operating a gas valve in a gas-fired heating system includes a solenoid having a pick coil and a hold coil connected to the pick coil and to a thermo-generator. A power supply...
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6935572 |
Temperature differential eliminator
The present invention relates to a device and method for providing precise temperature control using inexpensive temperature controllers and/or thermostats. Specifically the invention provides...
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6889762 |
Vehicle air conditioning and heating system providing engine on and engine off operation
An air conditioning system for use in an over-the-road or off road vehicle is provided that allows operation during both engine on and engine off conditions. The system utilizes a variable speed,...
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6886754 |
Thermostat operable from various power sources
A thermostat is operable from battery, common-wire (“C-wire”), or furnace relay power. The thermostat includes a power source selector, such as a jumper wire, that is set when the thermostat is...
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6691923 |
Low noise solid-state thermostat
A low noise solid-state thermostat is provided designed to operate on AC power over a wide range of frequencies (e.g., from 0 Hertz (Hz) to 1000 Hz). The thermostat incorporates a soft start turn...
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6597275 |
Intrusion barrier for thermostat
A plug or grommet fits into the opening in the back plate of a thermostat and blocks or diverts intrusion air from entering the interior of the thermostat housing from the wall penetration for the...
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6549866 |
Digital electronic control unit
A digital electronic control unit that provides an efficient, miniature, reliable and cost-effective control mechanism for use in household and commercial appliances. It further is capable of...
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6354508 |
Electronic temperature controller, particularly for refrigeration appliances
The invention concerns an electronic temperature controller, particularly for refrigeration appliances, with mains connections ( 3, 4 ) and an electronic circuit ( 1 ) having a power supply ( 7 ),...
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6336593 |
Multipoint digital temperature controller
The present invention relates to an electronic digital thermostat control unit comprising a linear temperature sensing element ( 1 ) connected to an A-D converter ( 3 ), a sensitivityand offset...
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6216956 |
Environmental condition control and energy management system and method
An indoor environmental condition control and energy management system includes a plurality of inputs. A user input receives user input parameters including a desired indoor environmental condition...
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6145752 |
Temperature monitoring and control system
This invention generally relates to a thermostat system for use in thermal regulation of an environment. This invention involves thermal regulation systems for controlling the temperature of an...
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6094920 |
Circuit and method for controlling temperature without using CPU and software
A temperature control circuit comprises a temperature detection circuit for detecting the temperature of an object and outputting a temperature detection voltage, a first reference voltage...
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6062483 |
Electronic thermostat
An electronic thermostat for a temperature control in a vehicle uses a connection to a pre-existing, variable current source representing a temperature the desired ambient temperature. A...
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6032867 |
Flat plate thermostat and wall mounting method
The present invention provides preferably one or optionally two printed circuit boards that project from supports on a single cover plate into the wall opening formed preferably for a standard 3.5...
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6006996 |
Electronic thermostat control unit and its use in multipoint temperature controller for refrigeration and heating systems
This invention relates to an electronic digital thermostat consisting of a single p-n junction as the temperature sensing element connected to an A-D converter, a sensitivity and Offset Correction...
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5957374 |
Voltage boosting system and method for electronic thermostat relay
A microprocessor-controlled electronic thermostat system and method that detects the status of a thermostat output relay to determine if the relay has been set to a state as requested by the...
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5744973 |
Resistance to frequency circuit for measuring ambient temperature on a thermostat
A resistance to frequency circuit for measuring the ambient temperature on a thermostat. The temperature measuring circuit comprises a first Schmitt trigger NAND gate, a rectifier, a capacitor of...
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5573179 |
Method for controlling environmental conditions of living organisms based upon time integrated variables
A method for controlling environmental conditions or variables to which living organisms are exposed employs time integrated variables (TIVs) to assist in controlling the conditions. In one...
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5520327 |
Electronic thermostat having safety feature
An electronic thermostat having a safety feature includes a controller which sends control signals to circuitry used for activating a system for conditioning air. The control signals are used to...
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5485954 |
Reduced profile thermostat
A thermostat that includes a subbase having a back surface designed to be mounted conformal with a surface and an inner surface that has a portion of selected electrical components mounted thereon,...
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5467921 |
Thermostat having short circuit protection
An electronic thermostat having a short circuit protection feature has a controller which sends control signals to circuitry used for activating and deactivating a system for conditioning air....
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5257735 |
Automatic room environment controller
An automatic room environment controller which avoids the unnecessary improving operation for the room environment, the controller comprising: member for detecting condition of room environment;...
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5199637 |
Electronic thermostat having correction for internally generated heat from load switching
The apparatus controlling operation of a digital thermostat mounted in an enclosure corrects the internally measured temperature for heat generated within the thermostat enclosure by the switching...
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5002226 |
Thermostat with mechanical heat anticipation and droop control
An electromechanical thermostat for controlling the on/off cycle of a heating/cooling unit. The thermostat has a temperature sensing element with a variable position according to the sensed...
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4875342 |
Temperature control means for a refrigerating apparatus
A temperature control device for a refrigerating apparatus is disclosed. The temperature control device is provided with a controlled temperature determining circuit to determine the temperature...
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4827731 |
Temperature control means for a refrigerating container
A temperature control means which is suitable for use with small, transferable refrigerated containers is described. The temperature control means includes a plurality of switches which determine...
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4824013 |
Temperature controller
A line voltage controller/thermostat for heating and cooling systems. The controller includes a bulb-and-capillary temperature sensor operating a line voltage load current switch. The load current...
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4776514 |
Two wire line voltage thermostat
A two wire line voltage thermostat has first and second terminals for receiving line voltage power and for connection to a load, a transformer having a current primary winding, a voltage primary...
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4641778 |
Electronic water heater thermostat system
An electronic water heater thermostat system for controlling the heating of water in residential and commercial water heaters, the system incorporating improved circuitry for controlling the water...
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4638850 |
Electronic thermostat
An electronic thermostat for controlling multiple temperature altering apparatus of an animal enclosure or the like. A voltage divider to produce a plurality of temperature sensor signals which are...
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H000193 |
Electronic temperature equalizer
An electronic circuit has been devised for precisely controlling the temperature of one zone in response to a change in temperature in another zone. Two sensors, one in each zone, are wired in...
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4566861 |
Method of and apparatus for operating a diffusion pump
A diffusion pump is operated by controlling the rate at which vapor is evaporated from a pool in response to an indication of the effectiveness of a fluid in cooling a condensation surface for the...
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4504010 |
Temperature control device
An improved temperature control device which is so arranged that, by obtaining an average value of digital output amount of an A/D converter, if variation of the above digital output amount average...
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4333605 |
Variable input-resistance power supply circuit
A power supply circuit for a temperature control system is switchable between a low input impedance mode and a high input impedance mode, so that a temperature control system having this power...
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4314666 |
Adjustable electronic temperature control, especially for refrigerators or the like
Adjustable electronic temperature control, having a bridge circuit with arms and at least one diagonal connected between points of the bridge, a thermistor for sensing temperature connected in one...
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4283921 |
Control and alarm system for freezer case temperature
The temperature within a freezer case or refrigeration compartment is operatively determined and controlled by a control system employing a microcomputer which operatively controls a refrigeration...
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4210823 |
Condition control system with special set point means
A time proportional control means, shown as a temperature control system, utilizes an expanded time constant arrangement with a unidirectional type of digital counter. The control system also...
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3951625 |
Air conditioning apparatus
Air conditioning apparatus ventilates room air with environmental air after the environmental air has been filtered, heated and humidified to appropriate levels. Environmental air is drawn into an...
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3942718 |
Electronic thermostat
An electronic thermostat for controlling the operation of a temperature changing device such as a heater or a cooling device to maintain the temperature of an object at a desired level. The...
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3918636 |
Dual temperature controller
An apparatus is disclosed for effecting precision control over the temperature of water utilized in laboratory experiments. In its preferred form, the apparatus constitutes a Wheatstone bridge...
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3913833 |
Air conditioning systems
An air conditioning system, especially for aircraft cabins, has a temperature control loop incorporating a signal processing control stage, in the form of a pulse logic network, to derive, from the...
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3908899 |
Heating and cooling control system for residential apartment or other multi-space buildings
A system for regulating heating or cooling within an enclosed structure includes an arrangement of a plurality of separately located thermostatic control devices connected in a series-parallel...
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3896871 |
Computer controlled automated building system having a manual control mode
A computer controlled automated building system for controlling environmental conditioning equipment to maintain the interior environment within a building. The system has a manual control mode to...
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3841394 |
MINIMUM AIR VOLUME CONTROL DEVICE
Apparatus and method for varying airflow in a variable air volume distribution system. A thermostat control normally acts to vary airflow to maintain constant temperature. In order to establish a...
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3834617 |
PID CONTROLLER FOR HEATING, VENTILATING AND AIR CONDITIONING SYSTEMS
A heating and/or air conditioning system including a novel controller of the PID type. A proportional integrator (PI) circuit is arranged to receive the output signal from a differentiator (D)...
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3829010 |
THERMOSTAT FOR POWER VENTILATORS AND THE LIKE
A thermostat for use with a power ventilator which responds to attic or inside temperatures to actuate a motor turning a power ventilator, said thermostat incorporating a first means which is...
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3825182 |
CONTROL DEVICES FOR DAMPERS AND THE LIKE
A control device is provided for dampers and the like which are adapted to be installed in a duct system whereby the combined control device and damper function as an air valve to control the flow...
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3815815 |
SOLID STATE THERMOSTAT
Electrical thermostats which require the running of only a minimum number of lead wires for a maximum number of functions. In one case, a capacitor smooths the firing potential of a unijunction to...
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3814312 |
TEMPERATURE CONTROL DEVICE
A temperature control device for a zone heating and cooling system is disclosed wherein each zone can be individually temperature controlled by a modulation action of the temperature control...
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3785432 |
ELECTRONIC CONTROL CIRCUIT WITH TIME DELAY OF MAIN AND FEEDBACK SIGNALS
An electronic control circuit particularly adaptable for use in a heating and/or cooling control system wherein signals are received from a plurality of zones to control stages of temperature...
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