Induction Coil Assembly with Ferrite Layer for Inverter Efficiency
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Solution Overview
Problem
Existing induction coils in cooktops face inefficiencies and require improvements in electrical efficiency and resistance, particularly when operating with full-bridge inverters.
Innovation Solution
The induction coil assembly incorporates a resonant circuit with a capacitor range of 0.1 to 0.6 microfarads and a coil operating at 50 to 150 kHz, utilizing a full-bridge inverter and a unique arrangement of a ferrite layer to enhance resistance and optimize induction heating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If existing induction coils are used in cooktops, then the basic induction heating function is provided, but electrical efficiency is insufficient and resistance is inadequate when operating with full-bridge inverters
Solution Approach 1:
The patent applies parameter changes by optimizing the coil's electrical characteristics including resistance (0.05-0.2 ohms), inductance (40-80 microhenries), and operating frequency (50-150 kHz). These parameter adjustments enable the coil to achieve enhanced electrical efficiency and improved performance when operating with full-bridge inverters, directly resolving the technical contradiction between energy efficiency and reliability.
2Reliability
If the coil size and structure are increased to improve resistance and efficiency, then electrical performance improves, but the cooktop design becomes less slim and more complex
Solution Approach 1:
The patent employs composite materials by integrating the induction coil with ferrite layers and protective coatings to enhance resistance and electrical performance without increasing the overall size. This composite structure allows the coil assembly to achieve improved reliability while maintaining a compact, slim design, effectively resolving the contradiction between resistance improvement and device complexity.
3Use of energy by moving object
If the coil operating frequency is increased to improve efficiency, then electrical efficiency improves, but the resonant circuit components become more complex and costly
Solution Approach 1:
The patent optimizes the operating frequency parameter within the range of 50-150 kHz to achieve enhanced electrical efficiency. By carefully selecting and tuning this frequency parameter in conjunction with the resonant circuit components (capacitor: 0.1-0.6 microfarads), the system achieves improved energy efficiency while keeping the resonant circuit design practical and cost-effective, resolving the contradiction between efficiency improvement and circuit complexity.
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 enhanced electrical efficiency, increased resistance, and a slim design, while maintaining cost-effectiveness by using a full-bridge inverter and a ferrite layer to focus magnetic fields effectively.
Implementation Method 1
a coil disposed under the cooking surface and configured to operate at a working frequency of between 50 kHz and 150 kHz
Implementation Method 2
a unique arrangement of a ferrite layer to enhance resistance and optimize induction heating
Implementation Method 3
a resonant circuit having a resonant frequency in the range of 40 kHz to 60 kHz
Data Source
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AI summary
An induction cooktop (10) includes a cooking surface (12) operable to support cookware (14) and a resonant circuit (16) having a resonant frequency in the range of 40 kHz to 60 kHz. The resonant circuit (16) includes a capacitor (18) having capacitance of between 0.1 micro-Farads and 0.6 micro-Farads and a coil (20) disposed under the cooking surface (12) and configured to operate at a working frequency of between 50 kHz and 150 kHz. The induction cooktop (10) includes an induction control circuit configured to power the resonant circuit (16) at the working frequency.