Induction Hob EMI Filter with Closed Magnetic Core
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Solution Overview
Problem
Existing induction hobs face challenges in effectively reducing high-frequency noise generated in the power unit, which affects the AC mains voltage, requiring separate components for common mode and differential mode filtering, increasing complexity and costs.
Innovation Solution
An electromagnetic filtering section with a closed magnetic core element and coils provides both common mode and differential mode filtering capabilities in a single component, utilizing a bar-shaped or plate-shaped core element to enable direct magnetic flux and adjustable air gaps for tuned filtering behavior.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate common mode and differential mode filtering components are used, then filtering effectiveness is improved, but device complexity and installation space increase
Solution Approach 1:
The patent combines separate common mode and differential mode filtering components into a single integrated electromagnetic interference filter. The filter housing contains both filtering circuits, allowing them to work simultaneously in one compact unit rather than requiring separate installations, thereby reducing device complexity while maintaining comprehensive filtering effectiveness.
Solution Approach 2:
The integrated EMI filter performs multiple filtering functions (both common mode and differential mode noise suppression) within a single device. This multi-functional design eliminates the need for separate filtering components, reducing overall system complexity and installation space while providing comprehensive electromagnetic interference protection.
2Reliability
If separate common mode and differential mode filtering components are used, then filtering effectiveness is improved, but manufacturing costs increase
Solution Approach 1:
By merging separate filtering components into one integrated unit, the patent reduces the total number of parts that need to be manufactured, stocked, and assembled. This consolidation simplifies the supply chain and manufacturing process, leading to lower production costs while maintaining effective noise filtering performance.
3Reliability
If multiple filtering components are used, then comprehensive noise suppression is achieved, but installation space increases
Solution Approach 1:
The patent integrates both common mode and differential mode filtering circuits into a single compact filter housing, dramatically reducing the installation space required compared to separate components. This consolidated design maintains comprehensive noise suppression capability while occupying minimal space in the power unit.
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 solution reduces filter complexity and installation space while lowering manufacturing costs, achieving effective noise suppression with optimized common and differential mode filtering capabilities.
Implementation Method 1
said electromagnetic filtering section may particularly comprise a closed magnetic core element around which at least two coils are provided. Said closed magnetic core element and said coils preferably provide said common mode filtering means.
Implementation Method 2
Said differential mode filtering means more preferably are adapted to enable a direct magnetic flux between the coil ends of each coil in order to obtain differential mode filtering effect.
Implementation Method 3
According to embodiments, an air gap is provided at one side or at each side between said bar-shaped or plate-shaped core element and said closed magnetic core element. Thereby, the filtering behaviour of the filtering section can be designed according the required needs.
Data Source
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Figure 5~6
AI summary
Induction hob comprising an AC power input (2) and a power conversion entity (3) adapted to provide high frequency electric current to an induction coil, wherein an electromagnetic filtering section (1) is provided between said AC power input (2) and said power conversion entity (3), said electromagnetic filtering section (1) comprising common mode filtering means and differential mode filtering means, wherein said electromagnetic filtering section (1) comprises a closed magnetic core element (4) around which at least two coils (5, 6) are provided, said closed magnetic core element (4) and said coils (5, 6) providing said common mode filtering means, and wherein said differential mode filtering means are adapted to enable a direct magnetic flux between the coil ends (5.1, 5.2, 6.1, 6.2) of each coil (5, 6) in order to obtain differential mode filtering effect.