MEMS Thermal Metamaterial Switch for Low-Power Temperature Control
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Solution Overview
Problem
Conventional methods for temperature control in micro-electro-mechanical systems (MEMS) sensors are inefficient, particularly for cooling, which affects their accuracy over a military temperature range, and introduce thermal coupling that decreases the efficiency of resistive heating elements.
Innovation Solution
A thermal metamaterial device incorporating a MEMS thermal switch with a substrate layer, thermal bus, insulator layer, and thermal pad, where the application of voltage causes electrostatic interaction to adjust thermal conductivity, enabling efficient cooling and heating without sacrificing performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If conventional cooling devices (thermo-electric cooling devices) are used, then cooling capability is provided, but thermal coupling to the environment increases and heating efficiency decreases
Solution Approach 1:
A thermal isolation scaffold comprising a substrate and an island portion thermally isolated from the substrate is introduced as an intermediary structure. The scaffold provides a thermal barrier between the cooling device and the environment, reducing unwanted thermal coupling. This allows the cooling device to cool the MEMS sensor effectively while minimizing the negative impact on resistive heating element efficiency.
2Temperature
If resistive heating elements are used for temperature control, then heating capability is provided, but thermal coupling to the environment increases when cooling is attempted
Solution Approach 1:
The thermal isolation scaffold acts as a mediator that decouples the heating element from the environment. By placing the heating element on the thermally isolated island portion, the scaffold allows efficient heating of the MEMS sensor while preventing excessive thermal coupling to the environment that would otherwise occur when attempting cooling operations.
3Measurement precision
If temperature control is implemented for MEMS sensors over military temperature range, then sensor accuracy is improved, but device complexity increases
Solution Approach 1:
The thermal isolation scaffold serves multiple functions simultaneously: it provides thermal isolation for both heating and cooling operations, supports both resistive heating elements and cooling devices, and maintains sensor accuracy across the full military temperature range. This multi-functionality reduces the need for separate complex thermal control structures for different operating conditions.
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
The solution provides improved thermal conductivity by an order of magnitude, allowing for stable temperature control of electronic components, enabling efficient passive cooling and maintaining heating capability, thus enhancing the operational reliability of MEMS sensors and atomic clocks.
Implementation Method 1
When a voltage is applied to the thermal pad, an electrostatic interaction occurs between the thermal pad and the thermal bus to cause a deflection of the overhang portion of the thermal pad toward the thermal bus
Implementation Method 2
a thermal bus over a first portion of the substrate layer, the thermal bus including a second material having a second thermal conductivity that is higher than the first thermal conductivity
Data Source
AI summary
A thermal metamaterial device comprises at least one MEMS thermal switch, including a substrate layer including a first material having a first thermal conductivity, and a thermal bus over a first portion of the substrate layer. The thermal bus includes a second material having a second thermal conductivity higher than the first thermal conductivity. An insulator layer is over a second portion of the substrate layer and includes a third material that is different from the first and second materials. A thermal pad is supported by a first portion of the insulator layer, the thermal pad including the second material and having an overhang portion located over a portion of the thermal bus. When a voltage is applied to the thermal pad, an electrostatic interaction occurs to cause a deflection of the overhang portion toward the thermal bus, thereby providing thermal conductivity between the thermal pad and the thermal bus.