Abstract: 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 environment and the thermostat systems used in thermal regulation systems. The invention provides a pair of contacts and a creep action bi-metal thermostat, electrically connected to the pair of contacts. The bi-metal thermostat provides an electrical connection between the pair of contacts when the thermostat is exposed to temperatures within one defined range, and the thermostat interrupts any electrical connection between the pair of contacts when the thermostat is exposed to temperatures that are outside of the defined range. A capacitor, is electrically connected between the contacts, in parallel with the creep action bi-metal thermostat to prevent heating caused by electrical arcing within the bi-metal thermostat from altering the performance of the bi-metal thermostat.

Abstract: 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 generation circuit for generating a first reference voltage that corresponds to the upper limit of a predetermined suitable temperature range, a second reference voltage generation circuit for generating a second reference voltage that corresponds to the lower limit of the suitable temperature range, a first temperature comparison circuit for comparing the temperature detection voltage with the first reference voltage, a second temperature comparison circuit for comparing the temperature detection voltage with the second reference voltage, a temperature control signal generation circuit for generating a temperature control signal for controlling ON/OFF of a power supply of a cooler based on outputs signals of the first and second temperature comparison circuit, and a temperature control circuit for setting ON/OFF the power

Abstract: 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 temperature control unit has a temperature sensor to sense the ambient temperature, the output of which is representative of the ambient temperature, and compares that output to the pre-existing, variable current source. A control signal output from the temperature control unit regulates the ambient temperature.

Abstract: 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 inch by 2 1/16 inch junction or outlet box. Screw holes are provided in the cover plate to match the standard screw holes in the single junction box and a high degree of functionality is provided in the programmable thermostat via the components on the printed circuit board such that the printed circuit boards are about only as long as the distance between those screw holes and still fit within the width of the single junction box.

Abstract: 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 circuit, digital comparators, digital noise filters, a control latch, an output drive and protection circuit and a solid-state switch to produce the desired output, with user input in either analogue form using a potentiometer or digital form using a switch, with calibration and control data stored in non-volatile memory, and a display unit for displaying sensed or user-set temperature.This invention further relates to the application of the said electronic digital thermostat in a multipoint temperature controller for Refrigeration and Heating systems, using a plurality of the said electronic thermostat control units with a logic circuit, Central Control Unit, System Timers, and a Starting Relay circuit to provide application-specific functions.

Abstract: 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 microprocessor and, if not, providing a boosted or increased voltage to the output relay in an attempt to correct the relay setting. Preferably, the system determines if the output relay is correctly turned off as requested by the microprocessor, and, if it is not, a first boosted voltage value is provided to the output relay in an attempt to turn the relay off. If this fails, a second higher boosted voltage value is provided to turn the output relay off. This continues periodically until an off condition is detected.

Abstract: A thermostat control having improved user controls wherein an analog version contains a binary coded switch for selectively setting a setpoint temperature. The binary coded switch is configured to have discrete positions corresponding to a plurality of setpoint temperature settings. It contains, among other things, a resistor network configured to produce a setpoint signal indicative of the binary coded switch position and a setpoint adjust switch for setting the binary coded switch position. Also, digital version having a man-machine interface port, wherein point information from a controller can be viewed and modified with the thermostat control device controls when a hardware passkey is inserted into the man-machine interface port.

Abstract: 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 which one terminal is electrically connected to ground, a first resistor, a thermistor and possibly a second resistor. The capacitor is connected with the cathode electrically connected to ground, the anode is electrically connected to the first input of a NAND gate. The output of the NAND gate is electrically connected to the anode of the rectifier. The cathode of the rectifier is electrically connected to both the thermistor and the first resistor. The second terminal of the first resistor is electrically connected to the anode of the capacitor and the first input to the NAND gate. The thermistor is electrically connected to a tri-state buffer of the microprocessor. The circuit uses the open drain output ports of a microprocessor to provide the multiplexer function of the A/D.

Abstract: 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 control the active state of the system for conditioning air. Furthermore, safety cutoff circuitry is incorporated into the thermostat whereby the safety cutoff circuitry is used to override the control signal sent from the controller when a predetermined temperature is reached in the space being heated or cooled.

Abstract: 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, including a first electrical communication device. The subbase has first mechanical connectors formed integral therewith. A cover that has a front surface designed to carry selected components for communication with an operator and an inner surface that has a portion of selected electrical component supported thereby, including a second electrical communication device. The inner surface has second mechanical connectors formed integral therewith. During installation, the cover is brought into registry with the subbase to form a thermostat housing that has a reduced profile and that substantially encloses the electrical components of the thermostat.

Abstract: 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. Short circuit protection circuitry monitors the circuitry within the thermostat and indicates to the controller when a short circuit has occurred. When a short circuit is detected, the controller sets its control signal to deactivate the system for conditioning air for a predetermined period of time.

Abstract: 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; member for improving means for improving the condition of the room environment; first member for comparing a value of the condition previously detected by the detecting means with a first predetermined value to determine whether operation of the improving means is necessary or not, so that the operation of the improving means is continued until the condition is improved to the first predetermined value when the necessity of the operation of the improving means; second member for comparing a value of the condition detected at present by the detecting means with the previously detected value of the condition to determine whether the condition corresponding to the value detected at present is improved than the condition corresponding to the previously detected value or not, when the condition corresponding to the value d

Abstract: 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 element controlling operation of the load, typically a HVAC unit. The actual ambient temperature is derived by subtracting from the internal temperature a correction value which follows the fraction of total time the switching element conducts power for the HVAC unit (duty cycle). The duty cycle is preferably multiplied by a scale factor and the difference between the ambient temperature as currently calculated and the internal temperature to form the correction value.

Abstract: An electrical system for controlling the operation of a heat exchanger, control device therefor and methods of making the same are provided, the system comprising a first electrical transformer, a relay for causing the heat exchanger to be in one condition thereof when the relay is activated and for causing the heat exchanger to be in another condition thereof when the relay is deactivated, a switch for placing the relay across the secondary winding of the first transformer to activate the relay when the switch is in one condition thereof and to deactivate the relay when the switch is in another condition thereof, and a second transformer having a low voltage high current winding disposed in series with the switch when the switch is in one condition thereof so as to supply power to the low voltage high current winding and to increase the current flow from the secondary winding through the relay to activate the relay, the second transformer having only one other winding that is so arranged that power is suppli

Abstract: 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 temperature. Associated with the sensing element is a switch member that provides on/off signals in response to the position of the sensing element. The thermostat has mechanical heat anticipation to control the generation of the on/off signals. In the preferred embodiment the mechanical heat anticipation is accomplished by a stepper motor which varies the position of either the sensing element or switch member to simulate thermal heat anticipation. The thermostat also has a mechanical structure to reduce or eliminate thermostat droop. Preferably this structure includes a control circuit to detect the duty cycle of the heating/cooling unit and mechanically and automatically adjusts the thermostat set point.

Abstract: 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 condition of the refrigerating chamber in accordance with the operation of a plurality of switches connected with the circuit. Therefore, the temperature condition in the refrigerating chamber can be controlled and maintained at a predetermined level in accordance with the operation of the temperature determining switches.

Abstract: 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 the desired temperature level in the container by switch contact portions provided by the container. The predetermined temperature for controlling the refrigeration in the container is determined by operation of switches which control the refrigerating apparatus by comparing the desired temperature level with the actual temperature in the container.

Abstract: 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 switch is back-mounted on a deck plate adapted for covering a single width wall outlet box with the load switch recessed therein. Separate manually operated line voltage function (fan) switches are front mounted on the deck plate and protected by an impact resistant electrically insulating plastic housing thereover retained on the deck plate by fasteners accessible only from the backside. An outer decorative cover extends over the plastic switch housing and the sensing bulb with an adjustment shaft extending therethrough with adjustment knob thereon.

Abstract: 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 winding and a secondary winding, a primary controller connecting the current and voltage primary windings to the terminals, the controller having at least first and second states, the controller in the first state energizing both the current and voltage primary windings and in the second state energizing only the current primary winding, and a temperature responsive circuit connected to the secondary winding for controlling the controller between the first and second states in accordance with sensed temperature such that the load can be energized when the controller is in one of the states and can be deenergized when the controller is in the other of the states.

Abstract: 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 temperature set point and hysteresis and enabling the use of low cost, low tolerance potentiometers providing a precision voltage ratio for use in the system circuitry.

Abstract: 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 used to produce primary or override actuation signals. The set temperature signal is selectable between two set point limits which are selectively variable to calibrate different scales. A plurality of detectors respectively compare the plurality of sensor signals with a common set temperature reference signal to produce a plurality of detection signals at a plurality of preselected temperatures associated therewith. The preselected temperatures at which a first heat control detection signal is produced is different from the preselected temperature of which the first cool control detection signal is produced, so that a dead zone between cycles is created.

Abstract: 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 value at each sampling is within predetermined dead zone data, it is regard that there is no change, while on the other hand, if the above variation is larger than the dead zone data, control is effected on the assumption that variation has taken place by the amount obtained by removing the dead zone data from the amount of the variation.

Abstract: 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 supply can directly replace a bimetallic switch and the power supply will look to the rest of the system like the replaced bimetallic switch.

Abstract: 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 of the arms, a control circuit to be activated by the temperature control, a circuit for activating an indicating and safety device, at least two amplifiers for switching the control circuit and indicating and safety circuit on and off, means connected in the at least one diagonal for supplying a control voltage to the amplifiers, a plurality of resistors connectible in parallel in another arm for setting a setpoint temperature in the temperature control, the resistors having values increasing in a binary code, and at least one coding switch for selectively connecting the resistors in parallel in accordance with given temperature steps.

Abstract: 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 system associated with the freezer case. A sensing element is operatively connected to the microcomputer for supplying a signal representative of the freezer compartment temperature. Temperature selector switches establish upper and lower limits of a desired range of temperatures for the freezer case and another selector switch establishes an alarm condition temperature limit. The microcomputer follows a program of comparing the compartment temperature to the upper limit, the lower limit and the alarm condition limit. During normal operation, the microcomputer also controls a refrigerant valve to regulate the compartment temperature within the desired range. If the compartment temperature elevates to the alarm condition limit, the microcomputer energizes a first alarm.

Abstract: 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 intake duct, is passed successively through an air filter, an electric filament heater and is humidified by directing the air stream through a moving evaporator belt which is saturated with water from a water tank which is automatically controlled by a humidistat. The humidity level and temperature are automatically maintained by means of the humidistat and air temperature sensor.

Abstract: 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 thermostat comprises a device in heat exchanging relationship with the object for generating a temperature signal representative of the temperature of the object. A reference signal generator is operable to generate a reference signal representative of the desired temperature level. A comparator compares the reference and temperature signals and produces an operate signal to operate the temperature changing device when the reference and temperature signals are unequal.

Abstract: 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 opposing polarity so as to emit a signal when a temperature imbalance occurs. The circuit is designed to actuate a temperature controller in response to the signal. One application for the device is the establishment of adiabatic conditions for a reaction by controlling the temperature of the zone surrounding the reaction vessel to coincide with that within the vessel.