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US 11,768,000 B2Granted
System and method to operate HVAC system during voltage variation event
AssigneeJohnson Controls Tyco IP Holdings LLP
InventorsShaun B. Atchison, Theresa N. Gillette
Life of this patent
Estimating the term…
Abstract
A controller for a heating, ventilation, and/or air conditioning (HVAC) system is configured to detect an input voltage received as a power supply by the HVAC system, determine the input voltage exceeds a threshold value, and identify a voltage variation event based on determining that the input voltage exceeds the threshold value.
Claims20
A controller for a heating, ventilation, and/or air conditioning (HVAC) system, wherein the controller is configured to:
- detect an input voltage received as a power supply by the HVAC system;
- determine the input voltage exceeds a threshold value;
- in response to determining that the input voltage exceeds the threshold value:
- identify a voltage variation event in response to a determination that a duration of time during which the input voltage exceeds the threshold value is greater than a first threshold time period;
- and
- identify the voltage variation event in response to a determination that the input voltage trends away from the threshold value for a second threshold time period, wherein the second threshold time period is less than the first threshold time period;
- and
- operate a vapor compression system of the HVAC system in a de-rated operating mode to condition an air flow in response to identifying the voltage variation event.
5 more elements
A non-transitory, computer-readable medium comprising computer-executable instructions that, when executed by processing circuitry, cause the processing circuitry to:
- detect an input voltage received by a heating, ventilation, and/or air conditioning (HVAC) system;
- compare the input voltage to a first range of voltage values and a second range of voltage values, wherein the second range of voltage values is contained within the first range of voltage values;
- determine the input voltage is outside of the first range of voltage values and the second range of voltage values;
- monitor a first duration of time during which the input voltage remains outside of the first range of voltage values and the second range of voltage values;
- identify a voltage variation event based on determining that the first duration of time exceeds a first threshold time period;
- determine the input voltage is outside of the second range of voltage values and within the first range of voltage values;
- monitor a second duration of time during which the input voltage remains outside of the second range of voltage values and within the first range of voltage values;
- identify the voltage variation event based on determining that the second duration of time exceeds a second threshold time period, wherein the second threshold time period is greater than the first threshold time period;
- and
- operate a vapor compression system of the HVAC system in a de-rated operating mode to condition an air flow in response to identifying the voltage variation event.
7 more elements
A heating, ventilation, and/or air conditioning (HVAC) system, comprising:
- a compressor;
- and
- a controller communicatively coupled to the compressor and comprising a tangible, non-transitory, computer-readable medium with computer-executable instructions that, when executed by processing circuitry, cause the processing circuitry to:
- determine that an input voltage value of an input voltage received as a power supply by the HVAC system is outside of a range of voltage values;
- in response to a determination that the input voltage value is outside of the range of voltage values:
- identify a voltage variation event in response to a determination that monitor a duration of time during which the input voltage value is outside of the range of voltage values is greater than a first threshold time period;
- and
- identify the voltage variation event in response to a determination that the input voltage value trends away from the range of voltage values for a second threshold time period;
- and
- operate the HVAC system in a de-rated operating mode to enable conditioning of an air flow in response to identifying the voltage variation event.
7 more elements
Dependencies are inferred from the claim text.