Abstract: Disclosed are exemplary embodiments of methods for managing temperature overshoot. In an exemplary embodiment, a method includes determining a temperature delta between two sensor temperatures reported for a space at predetermined time intervals; determining a temperature rate of change by dividing the temperature delta with a time period that elapsed between the two sensor temperatures; determining a compensation by multiplying the temperature delta and the temperature rate of change; determining a compensated temperature by adding the compensation to a sensor temperature reported for the space; and using a controller and the compensated temperature to control operation of a heating system for the space.

Abstract: Disclosed are exemplary embodiments of methods for managing temperature overshoot. In an exemplary embodiment, a method includes determining a temperature delta between two sensor temperatures reported for a space at predetermined time intervals; determining a temperature rate of change by dividing the temperature delta with a time period that elapsed between the two sensor temperatures; determining a compensation by multiplying the temperature delta and the temperature rate of change; determining a compensated temperature by adding the compensation to a sensor temperature reported for the space; and using a controller and the compensated temperature to control operation of a heating system for the space.

Abstract: Disclosed are exemplary embodiments of methods for managing temperature overshoot. In an exemplary embodiment, a method includes determining a temperature delta between two sensor temperatures reported for a space at predetermined time intervals; determining a temperature rate of change by dividing the temperature delta with a time period that elapsed between the two sensor temperatures; determining a compensation by multiplying the temperature delta and the temperature rate of change; determining a compensated temperature by adding the compensation to a sensor temperature reported for the space; and using a controller and the compensated temperature to control operation of a heating system for the space.

Abstract: Disclosed are exemplary embodiments of methods for managing temperature overshoot. In an exemplary embodiment, a method includes determining a temperature delta between two sensor temperatures reported for a space at predetermined time intervals; determining a temperature rate of change by dividing the temperature delta with a time period that elapsed between the two sensor temperatures; determining a compensation by multiplying the temperature delta and the temperature rate of change; determining a compensated temperature by adding the compensation to a sensor temperature reported for the space; and using a controller and the compensated temperature to control operation of a heating system for the space.

Abstract: Disclosed are exemplary embodiments of methods for managing temperature overshoot. In an exemplary embodiment, a method includes determining a temperature delta between two sensor temperatures reported for a space at predetermined time intervals; determining a temperature rate of change by dividing the temperature delta with a time period that elapsed between the two sensor temperatures; determining a compensation by multiplying the temperature delta and the temperature rate of change; determining a compensated temperature by adding the compensation to a sensor temperature reported for the space; and using a controller and the compensated temperature to control operation of a heating system for the space.

Abstract: A power supply for a thermostat in an HVAC system includes a rectifier having a rectifier input for receiving input power from a voltage source, and a rectifier output. The thermostat also includes a rechargeable battery having a battery output, a voltage regulator coupled to receive a voltage from the rectifier output, and a boost regulator including a boost regulator input. The boost regulator is configured to convert a voltage received at the boost regulator input from the voltage regulator or the battery output. The thermostat also includes a battery charger management circuit configured to monitor a battery charge state of the rechargeable battery, and to selectively charge the rechargeable battery according to an operation state of the thermostat. Example methods of operating a power supply for a thermostat in an HVAC system are also disclosed.

Abstract: Controllers and methods for activating a switching device to apply electrical power to a heating element are provided. One example controller includes a temperature sensor disposed within the fluid and configured to sense an ambient temperature of the fluid, a switching device configured to apply electrical power to a heating element, and a processor coupled to the temperature sensor and the switching device. The processor is configured to determine a temperature delta value based on the sensed ambient temperature from the temperature sensor and a set point temperature, to determine an offset based on an average duty cycle of a switching device for a predetermined number of historical time intervals, and to calculate a duty cycle based on the temperature delta value and the offset.

Abstract: A thermostat is provided that includes a temperature sensor for sensing ambient temperature, and a switching device that is configured to apply electrical power to a heating element when the switching device is activated. The thermostat further includes a processor that is configured to periodically determine for a finite switching time period a temperature delta value indicative of the difference between the sensed temperature and a desired set point temperature. The processor is further configured to calculate a duty cycle ratio of the switch activation time relative to the total switching time period. The calculated duty cycle ratio for determining the switch activation time is determined as a function of the temperature delta value, a duty cycle offset and a heat dissipation offset. The duty cycle offset and the heat dissipation offset are based on an average of a predetermined number of prior duty cycle ratios.

Abstract: A thermostat is provided that includes a temperature sensor for sensing ambient temperature, and a switching device that is configured to apply electrical power to a heating element when the switching device is activated. The thermostat further includes a processor that is configured to periodically determine for a finite switching time period a temperature delta value indicative of the difference between the sensed temperature and a desired set point temperature. The processor is further configured to calculate a duty cycle ratio of the switch activation time relative to the total switching time period. The calculated duty cycle ratio for determining the switch activation time is determined as a function of the temperature delta value, a duty cycle offset and a heat dissipation offset. The duty cycle offset and the heat dissipation offset are based on an average of a predetermined number of prior duty cycle ratios.

Abstract: A digital thermostat having a plurality of user input buttons, a display, a battery, a real time clock, a memory and a processor that is capable of receiving initial time and date information and storing the information in memory. The initial time and date information is then provided to the real time clock for maintaining the current time in the thermostat. The user is prompted by the program to select and enter a time zone setting, after which the current date and local time is automatically set and shown on the thermostat display.