Multilayer Coupling Strips for Low-Power Surface De-Icing
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Solution Overview
Problem
Conductive surfaces on vehicles and aircraft face inefficiencies and safety risks due to ice accumulation, as existing heating systems are often bulky and inefficient, requiring significant power and lacking localized heating capabilities.
Innovation Solution
The use of higher frequency alternating electric currents to induce Joule heating in conductive materials by shaping current density through mechanisms like the skin effect and proximity effect, increasing effective resistance and heat generation while reducing the required current and voltage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional heating systems are used to prevent ice accumulation on conductive surfaces, then heating function is provided, but the systems become bulky and require significant power
Solution Approach 1:
The patent changes the electrical parameters by using high-frequency AC current (above 1 kHz) instead of traditional DC or low-frequency AC heating. This frequency change exploits the skin effect to concentrate current near the surface, increasing effective resistance and enabling efficient Joule heating with reduced power consumption while maintaining reliable ice prevention
2Productivity
If traditional heating systems are used to heat conductive surfaces, then ice removal is achieved, but the systems are bulky and lack localized heating capability
Solution Approach 1:
The patent applies local quality by using the skin effect to concentrate current density near the surface of the conductive material. This creates localized heating exactly where needed (at the surface) without requiring bulky heating elements, enabling efficient de-icing while maintaining a compact system configuration
Solution Approach 2:
The patent replaces traditional mechanical or resistive heating elements with an electromagnetic field-based solution. By using high-frequency AC current and the skin effect, the system generates heat directly in the conductive material surface without contact with bulky heating components, improving productivity while reducing device complexity
3Temperature
If high current is used to generate sufficient heat for de-icing, then heating performance is improved, but the system requires higher voltage and more power
Solution Approach 1:
The patent changes the electrical frequency parameter to above 1 kHz, which triggers the skin effect. This concentrates current near the surface, increasing effective resistance and enabling sufficient heating performance at lower power levels, thus improving temperature control while reducing power requirements
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 enables efficient, localized heating with reduced power consumption, improving safety and reliability, and allowing for faster de-icing and anti-icing of conductive surfaces without overheating the heating system.
Implementation Method 1
Joule heating, also known as ohmic heating or resistive heating, is the process by which the passage of an electric current through a conductor produces heat. The amount of heat generated by a conducting medium is based on the amount of current passed through the medium and the electrical resistance of the medium.
Implementation Method 2
The skin effect constrains current flow by taking advantage of the tendency of an alternating electric current to become distributed within a conductor such that the current density increases near the surface of the conductor, and decreases with greater depths in the conductor.
Implementation Method 3
The proximity effect can be used to further constrain current flow in the conductor by placing another AC current path near the existing current flowing in the conductor. The proximity effect can also act to lengthen the current path.
Data Source
Figure 1
Figure 2A~2B
Figure 3
AI summary
Aspects of the present disclosure can be embodied in a systems for heating an exterior surface of a bulk medium. In one example, the system includes two or more coupling strips spaced apart from one another and attached to the bulk medium. Each of the coupling strips has a multi-layer structure extending along a surface of the bulk medium that forms, in combination with the bulk medium, an electrical transmission line. The multi-layer structure includes a first dielectric layer over the bulk medium, a conductive layer over the first dielectric layer, a second dielectric layer over the conductive layer, and a conductive shielding layer over the second dielectric layer. A power control system is coupled to the conductive layer of each of the coupling strips and to the bulk medium. The power control system is configured to heat the bulk medium by providing current to the coupling strips.