Thermostat Multi-Source Power Switching for HVAC Reliability
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Solution Overview
Problem
HVAC systems face challenges in power management and configuration, particularly in identifying correct wiring and handling power source changes, leading to potential misconfigurations and user inconvenience.
Innovation Solution
A power handling thermostat that can adapt to multiple power sources, including line power and battery power, with features like voltage sensing to identify wire configurations and switch between power sources, and a supercapacitor for backup power, along with customizable buttons and direct communication with other thermostats or mini split units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a thermostat uses multiple power sources (line power and battery power), then power supply reliability is improved, but device complexity increases
Solution Approach 1:
The thermostat is designed to accept and operate from multiple power sources (line power and battery power), making the power system universal and adaptable to different installation scenarios. This multi-functionality ensures continuous operation regardless of power source availability.
Solution Approach 2:
The thermostat automatically detects power source availability and switches between line power and battery power without user intervention. The system self-manages power transitions, eliminating the need for manual configuration and reducing operational complexity for users.
2Ease of manufacture
If voltage sensing is used to identify wire configurations, then installation ease is improved, but measurement precision requirements increase
Solution Approach 1:
The thermostat automatically performs voltage sensing to detect wire configurations and terminals during installation. The system self-configures by identifying powered terminals through voltage detection, eliminating manual wiring configuration and reducing installation complexity.
Solution Approach 2:
The thermostat detects voltage presence and magnitude to determine wire configuration types. By monitoring voltage parameters, the system adapts its operation to match the detected wiring setup, enabling automatic configuration without precise manual measurement.
3Ease of operation
If automatic power source switching is implemented, then user convenience is improved, but device complexity increases
Solution Approach 1:
The thermostat autonomously monitors power source status and performs automatic switching between line power and battery power without requiring user action. This self-service approach maintains continuous operation while eliminating manual power management tasks for users.
Solution Approach 2:
The system continuously monitors the status of both power sources and uses this feedback to determine when switching is necessary. Based on real-time power availability information, the thermostat automatically transitions between power sources, ensuring uninterrupted operation.
4Loss of time
If self-configuration capabilities are added, then installation time is reduced, but device complexity increases
Solution Approach 1:
The thermostat automatically configures itself by detecting wire connections and voltage patterns during installation. The system identifies terminal functions and system type without requiring manual programming, significantly reducing installation time and technician expertise requirements.
Solution Approach 2:
The thermostat performs preliminary detection and configuration actions automatically upon power-up or wire connection. By pre-configuring system parameters based on detected wiring before user interaction, the system eliminates time-consuming manual setup steps.
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
Ensures reliable power supply, reduces misconfiguration errors, and enhances user convenience by automatically switching between power sources and providing notifications for power issues, while also simplifying installation and operation through self-configuration capabilities.
Implementation Method 1
determining that power is not available from line power of a HVAC system... determining that power is available from a supercapacitor in the thermostat... drawing power from the supercapacitor
Data Source
AI summary
Methods and systems, including computer programs encoded on computer storage media, for using a power handling thermostat, the method including determining that (i) power to a thermostat is not available from line power of a ventilation system and (ii) power is available from a supercapacitor in the thermostat, drawing power from the supercapacitor instead of from the line power, determining that power is no longer available from the supercapacitor, in response to determining that power is no longer available from the supercapacitor, drawing power from a battery in the thermostat instead of from the supercapacitor, determining that power to the thermostat is available from the line power of the ventilation system, and in response to determining that power to the thermostat is available from the line power of the ventilation system, drawing power from the line power of the thermostat.