Thermostat Power Wire Selection for Common-Wire-Free HVAC
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Solution Overview
Problem
Existing thermostats face challenges in maximizing power consumption efficiency, especially in HVAC systems without a common wire, where active and inactive power stealing methods are less efficient, leading to suboptimal energy harvesting.
Innovation Solution
The development of a thermostat with power wire selection circuitry that determines the HVAC wiring scheme and selects the appropriate power scheme, including active and inactive power stealing, to optimize power harvesting from HVAC systems, regardless of the wiring configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If active and inactive power stealing methods are used in HVAC systems without a common wire, then the thermostat can operate without a dedicated power wire, but power consumption efficiency is suboptimal and energy harvesting is insufficient
Solution Approach 1:
The system dynamically changes operational parameters by detecting HVAC wiring scheme types (single circuit vs. multiple circuit) and switching between different power stealing strategies. The power wire selection circuitry adjusts which wires are coupled to the power node based on the detected wiring configuration, optimizing power harvesting efficiency for each specific wiring scenario.
Solution Approach 2:
The thermostat employs dynamic wire connector coupling where the power wire selection circuitry selectively connects different wire connectors to the power node based on real-time detection of HVAC wiring schemes. This dynamic adaptation allows the system to maximize power harvesting efficiency regardless of whether the HVAC system uses single circuit or multiple circuit wiring configurations.
2Adaptability or versatility
If a thermostat is designed to work with multiple HVAC wiring schemes, then versatility is improved, but device complexity increases due to power wire selection circuitry
Solution Approach 1:
The power wire selection circuitry serves multiple functions: it detects the HVAC wiring scheme type, determines appropriate power wires based on the detected configuration, and selectively couples wire connectors to the power node. This multi-functional design enables the thermostat to work with various HVAC wiring schemes (single circuit, multiple circuit, with or without common wire) while managing complexity through integrated circuitry.
Solution Approach 2:
The thermostat automatically detects the HVAC wiring scheme configuration and self-configures its power harvesting strategy without requiring manual intervention. The power wire selection circuitry autonomously identifies the wiring type and selects appropriate power wires, enabling the system to adapt to different installations while minimizing user burden and simplifying the installation process.
Data Source
AI summary
A thermostat includes a plurality of HVAC (heating, ventilation, and air conditioning) wire connectors for receiving a plurality of HVAC control wires corresponding to an HVAC system. The thermostat also includes a thermostat processing and control circuit operative to at least partially control the operation of the HVAC system and a powering circuit coupled to the HVAC wire connectors and configured to provide an electrical load power to the thermostat processing and control circuit. The thermostat includes circuitry and methods for maximizing efficiency of energy harvested from the HVAC system connected to the thermostat, and depending on which system is connected to the thermostat, different power schemes can be implemented in order to obtain power from the HVAC system.