Power Rail Energy Integration for Accurate Thermostat Temperature Sensing
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Solution Overview
Problem
Digital electronic thermostats face inaccuracies in estimating ambient temperature due to self-heating from internal components, which affects temperature regulation and efficiency, especially when these components switch on and off irregularly, leading to unpredictable heating and inefficient conditioning of the environment.
Innovation Solution
A smart thermostat system that measures the power consumption and converts it into heat energy directly, using a power rail monitor and integrator to calculate the precise amount of power dissipated by components, allowing for accurate compensation of internal heating effects on temperature sensors to estimate external ambient temperature.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If electronic components are added to provide advanced features (wireless communications, processors, user interfaces), then the functionality and versatility of the thermostat is improved, but internal heat generation increases which interferes with temperature sensing accuracy
Solution Approach 1:
The patent divides the thermostat into distinct thermal zones: a first temperature sensor positioned away from heat-generating components to sense ambient temperature, and a second temperature sensor positioned near the components to sense their heat generation. This segmentation allows the system to separately measure and compensate for internal heating effects, maintaining accuracy despite added functionality.
Solution Approach 2:
The patent introduces power consumption measurements as an intermediary parameter to indirectly quantify the thermal impact of electronic components. By measuring the power consumed by each component and using this data to calculate expected temperature rises, the system can compensate for internal heating without requiring direct thermal contact with all heat sources.
2Device complexity
If temperature sensors are placed inside the thermostat housing to sense ambient temperature, then the device structure is simplified, but the sensors are affected by self-heating from internal components leading to measurement inaccuracy
Solution Approach 1:
The patent positions the first temperature sensor in a location within the housing that is thermally isolated from major heat-generating components, while placing a second sensor closer to the components. This spatial segmentation creates distinct measurement zones that can be mathematically combined to extract accurate ambient temperature despite the presence of internal heat sources.
Solution Approach 2:
The patent implements a feedback mechanism where power consumption data from electronic components is continuously monitored and used to calculate real-time compensation values for thermal interference. This feedback loop allows the system to dynamically adjust temperature readings based on the current thermal state caused by active components.
3Measurement precision
If power consumption is measured continuously to accurately quantify internal heating, then temperature compensation accuracy is improved, but energy is wasted and measurement complexity increases
Solution Approach 1:
The patent implements periodic sampling of power consumption at specific events (component power-on, power-off, and scheduled intervals) rather than continuous monitoring. This periodic measurement approach captures the essential thermal dynamics while significantly reducing the energy required for measurements and lowering the computational burden.
Solution Approach 2:
The patent pre-characterizes each electronic component's power consumption profile and thermal impact during manufacturing or initial setup. These pre-established relationships are stored and used to quickly estimate temperature effects without requiring complex real-time calculations, reducing both measurement frequency needs and processing energy.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method provides more accurate and predictive ambient temperature estimation by measuring the cause of self-heating rather than its results, enhancing the thermostat's ability to regulate temperature effectively and efficiently.
Implementation Method 1
an integrator coupled to the main power rail that stores energy on an energy-storage device, wherein the energy stored on the energy-storage device is representative of an amount an amount of power provided to the smart-home device through the main power rail during an integration cycle of the integrator
Data Source
AI summary
A smart-home device may include a main power rail that provides power to components of the smart-home device; an integrator coupled to the main power rail that stores energy on an energy-storage device, where the energy stored on the energy-storage device is representative of an amount an amount of power provided to the smart-home device through the main power rail during an integration cycle of the integrator; and a counter that stores a number of integration cycles performed by the integrator during a time interval, where a total amount of power provided to the smart-home device through the main power rail during the time interval is represented by: (1) the number of integration cycles performed by the integrator during the time interval; and (2) the energy stored on the energy-storage device.