Induction Heating Coil Segmentation for Current Loss Reduction
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Solution Overview
Problem
Existing induction heating apparatuses face inefficiencies due to significant current losses in resonant capacitors and choke coils, particularly when large currents flow through heating coils, leading to reduced heating efficiency and increased energy loss.
Innovation Solution
The induction heating apparatus employs a configuration with a first and second heating coil wound in different directions, connected in series and parallel with capacitors, and controlled by a processor to manage impedance and resonance frequency, forming a closed loop circuit to minimize current through the inverter and enhance heating efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a large current flows through the heating coil to achieve high heating power, then the heating efficiency is improved, but the current loss in the resonant capacitor and choke coil increases
Solution Approach 1:
The heating coil is divided into two separate coils (first heating coil and second heating coil) with different winding directions. This segmentation allows independent control of current paths, enabling the system to optimize power delivery while minimizing losses in resonant components by distributing current flow differently through each coil.
2Power
If the current through the heating coil is increased to improve heating performance, then the heating efficiency is improved, but the inverter must handle larger currents which increases system complexity and losses
Solution Approach 1:
By dividing the heating coil into two separate coils connected to different nodes of the inverter, the system can distribute the current load. This allows the inverter to operate at lower individual current levels while still achieving high total heating power, reducing the complexity and stress on the inverter components.
Solution Approach 2:
The dual-coil configuration acts as an intermediary between the inverter and the heating process. The two coils with different winding directions create magnetic fields that combine to achieve the desired heating effect, while the inverter only needs to supply current to each coil separately, reducing the peak current requirements and simplifying inverter design.
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 reduces energy losses, increases heating efficiency, and allows for the miniaturization of the apparatus while maintaining high performance, by equalizing impedance values and optimizing current flow through the coils.
Implementation Method 1
an induction heating apparatus using a heating coil
Implementation Method 2
capable of improving heating efficiency... control a resonance frequency of a current flowing through the first heating coil and the second heating coil
Data Source
AI summary
An induction heating apparatus including an inverter comprising a switching element, the inverter configured to supply a power to a first node based on an operation of the switching element; a first heating coil around which a wire is wound in a first winding direction with respect to the first node and configured to be heated by the power supplied from the first node; a second heating coil around which a wire is wound in a second winding direction different from the first winding direction with respect to the first node and configured to be heated by the power supplied from the first node; and at least one processor configured to control a resonance frequency of a current flowing through the first heating coil and the second heating coil.