Distributed Heatsink Switching for Compact Line Voltage Thermostats
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Solution Overview
Problem
Line voltage thermostats face integration constraints due to excessive heat generated by high electrical power, leading to bulky sizes and limited screen and button placement options, as traditional single heatsink cooling solutions are inadequate.
Innovation Solution
Implementing a multiple heatsink cooling system with semiconductor switches mounted on each heatsink, connected in parallel, allowing for higher maximum operating temperatures and thermal resistances, enabling a more efficient layout and reduced overall product size while maintaining or increasing power rating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a single heatsink is used to cool the switching component, then the thermostat can handle high electrical power, but the thermostat becomes bulky and integration constraints are created
Solution Approach 1:
The single heatsink is divided into multiple separate heatsinks (first heatsink and second heatsink), each handling a portion of the electrical power. This segmentation allows the switching component to be split into multiple lower-power components distributed across different heatsinks, reducing the overall volume required for cooling while maintaining total power handling capability.
2Power
If a single heatsink is used for cooling, then power handling is concentrated, but the layout of display and control buttons is limited
Solution Approach 1:
By dividing the single heatsink into multiple separate heatsinks positioned at different locations within the thermostat housing, the design enables greater flexibility in arranging display screens, control buttons, and other components. Each heatsink can be strategically placed to optimize both thermal management and user interface layout.
Solution Approach 2:
The transition from a single centralized heatsink to multiple distributed heatsinks adds spatial dimensionality to the design, allowing components to be arranged in different configurations and orientations, thereby improving layout versatility and adaptability.
3Temperature
If multiple heatsinks are used with higher thermal resistances, then maximum operating temperatures increase, but the cooling efficiency per heatsink decreases
Solution Approach 1:
The total power dissipation is divided among multiple heatsinks, with each heatsink handling a portion of the thermal load. Although individual heatsinks have higher thermal resistances, the distributed architecture ensures that no single heatsink is overwhelmed, maintaining reliable cooling performance across the entire system.
Solution Approach 2:
The design accepts higher thermal resistance parameters for individual heatsinks in exchange for achieving higher maximum operating temperatures for the switching components. This parameter change is compensated by the parallel configuration of multiple heatsinks, which collectively maintain adequate cooling efficiency.
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 approach results in a smaller, more aesthetically pleasing thermostat with improved integration of screen and buttons, offering increased flexibility and a higher power rating without size reduction, enhancing market competitiveness.
Implementation Method 1
A first heatsink and a second heatsink may be situated in the housing at a maximum distance from one another within the housing. Each heatsink may have a solid state switch situated on it
Implementation Method 2
The two or more heatsinks may be situated within a housing of the line voltage thermostat
Data Source
AI summary
A line voltage thermostat having a multiple heatsink switch. A total switch may have a semiconductor switch mounted on each heatsink of the multiple heatsink switch. The semiconductor switches of the respective heatsinks may be connected in parallel to represent the total switch. Each of the two or more heatsinks, having a semiconductor switch for switching, and in total conveying the same power as one equivalent switch with one total heatsink, may have higher maximum operating temperatures and higher thermal resistances than twice the thermal resistance of the one total heatsink. The two or more heatsinks may be situated within a housing of the line voltage thermostat, and be easier to distribute in the housing to achieve an efficient layout of a display and control buttons for the thermostat.