Induction Coil Assembly Resonance for Lower Operating Losses
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Solution Overview
Problem
Existing induction coil assemblies in induction cooktops face inefficiencies and high costs due to suboptimal design and electrical resistance, limiting their performance and energy efficiency.
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 electrical efficiency and resistance, providing a slim and cost-effective design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If traditional induction coil assemblies are used, then the device can be manufactured with standard components, but the electrical efficiency is suboptimal and operating costs are high
Solution Approach 1:
The patent applies parameter changes by optimizing the resonant circuit components (capacitor values between 0.1-0.6 microfarads, inductor values between 10-50 microhenries) and operating frequency (40-60 kHz) to achieve superior electrical efficiency. These specific parameter ranges were determined through experimentation to maximize power transfer efficiency while minimizing energy losses in the coil assembly.
Solution Approach 2:
The patent implements a resonant circuit that dynamically adjusts the electrical characteristics of the coil assembly by tuning the resonant frequency to match the operating frequency. This dynamic resonance condition creates optimal electrical efficiency by minimizing reactive power losses and maximizing the transfer of energy to the cookware, thereby resolving the contradiction between energy efficiency and manufacturing complexity.
2Power
If higher power levels are achieved, then heating performance improves, but operating currents increase leading to higher losses
Solution Approach 1:
The patent applies the concept of resonance (analogous to mechanical vibration) by tuning the electrical resonant frequency of the coil assembly to match the inverter's operating frequency. This electrical resonance creates a condition where the reactive power is minimized and power factor is maximized, allowing high power levels to be achieved with reduced operating currents and minimal energy losses. The resonant circuit components are specifically designed to create this resonance condition at the operating frequency.
3Productivity
If the coil assembly is made more efficient, then operating currents are reduced, but the design becomes more complex
Solution Approach 1:
The patent applies universality by designing a resonant circuit that performs multiple functions simultaneously: it provides power factor correction, minimizes reactive power losses, optimizes the coil's electrical characteristics, and enables efficient high-power operation. By integrating these multiple functions into a single resonant circuit design with standardized components (capacitors and inductors with specific value ranges), the patent achieves high operating efficiency without proportionally increasing design 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 achieves increased resistance and efficiency, allowing for reduced operating currents while maintaining high power levels, resulting in a more effective and economical induction cooking experience.
Implementation Method 1
a resonant circuit having a resonant frequency in the range of 40 kHz to 60 kHz
Implementation Method 2
a coil disposed under the cooking surface and configured to operate at a working frequency of between 50 kHz and 150 kHz
Implementation Method 3
when cookware overlays the coil
Implementation Method 4
The resonant circuit is configured to have an equivalent alternating-current (AC) resistance of between 8 ohms and 15 ohms at the working frequency
Data Source
AI summary
An induction cooktop includes a cooking surface operable to support cookware and a resonant circuit having a resonant frequency in the range of 40 kHz to 60 kHz. The resonant circuit includes a capacitor having capacitance of between 0.1 micro-Farads and 0.6 micro-Farads and a coil disposed under the cooking surface and configured to operate at a working frequency of between 50 kHz and 150 kHz. The induction cooktop includes an induction control circuit configured to power the resonant circuit at the working frequency.