Induction Heating Insulation Structure for Creepage Distance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Induction heating devices face challenges in achieving high-output and sufficient creepage distance to prevent electric shock accidents, often due to the small size of working coils and ferrite cores, which limits magnetic flux and increases the risk of electrical accidents.
Innovation Solution
The induction heating device incorporates a high-output working coil with an annularly wound conducting wire, a ferrite core with extended outer portions, and insulating members, including Kapton tape, to provide a significant creepage distance and prevent heat transfer, ensuring electrical insulation and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the ferrite core size is increased to reduce magnetic flux leakage and improve output, then the output is improved, but the creepage distance for electrical insulation becomes insufficient
Solution Approach 1:
The insulation structure is segmented into multiple components: insulating members positioned between the ferrite core and base plate, and additional insulating members between the working coil and ferrite core. This segmentation allows the insulation function to be distributed across multiple elements, achieving sufficient creepage distance without limiting the ferrite core size.
Solution Approach 2:
Insulating members are introduced as intermediary elements between the conductive components (working coil and base plate). These intermediaries provide the necessary electrical insulation and creepage distance while allowing the ferrite core to maintain its optimal size for high output performance.
2Area of stationary object
If the working coil size is reduced to fit the heating zone, then the heating zone precision is improved, but the output power decreases
Solution Approach 1:
The insulation system is segmented into multiple layers and positions, allowing the working coil to be positioned optimally for heating zone precision while maintaining sufficient distance from the base plate for electrical insulation. This enables the use of appropriately sized working coils without compromising safety or output.
3Reliability
If the distance between working coil and base plate is increased to provide creepage distance, then electrical safety is improved, but the magnetic coupling efficiency decreases
Solution Approach 1:
Insulating members are positioned strategically as intermediaries between the working coil and base plate. These intermediaries provide the necessary creepage distance for electrical safety while minimizing the impact on magnetic coupling efficiency by being positioned at the edges rather than in the center of the heating zone.
Solution Approach 2:
The insulation is applied with local quality - insulating members are positioned at specific locations (between ferrite core and base plate, and between working coil and ferrite core) rather than uniformly throughout. This localized insulation approach maintains electrical safety while preserving magnetic coupling efficiency in the critical heating area.
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 configuration allows for high-output induction heating while ensuring user safety by providing an adequate creepage distance, enhancing the device's performance and reliability.
Implementation Method 1
a ferrite core that is disposed on an upper surface of the base plate, that is disposed vertically below the working coil, and that is configured to direct upward an alternating magnetic field generated by the working coil
Implementation Method 2
In the induction heating method, eddy current may be generated in the object made of metal based on a magnetic field generated around the coil based on a high-frequency power having a predetermined magnitude applied to the coil to heat the object
Implementation Method 3
In the induction heating method, eddy current may be generated in the object made of metal based on a magnetic field generated around the coil
Data Source
AI summary
An induction heating device includes: a base plate; a working coil disposed vertically above the base plate, the working coil including a conducting wire that is annularly wound; a ferrite core that is disposed on an upper surface of the base plate, that is disposed vertically below the working coil, and that is configured to direct upward an alternating magnetic field generated by the working coil; and an insulating member attached to an outer portion of the ferrite core and configured to electrically insulate the working coil from the base plate.