Induction Cooktop Inverter Control for Magnetic and Non-Magnetic Pans
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Solution Overview
Problem
Existing induction heating cooktops face challenges in efficiently heating both magnetic and non-magnetic cooking vessels due to varying output power based on vessel material, and they suffer from significant switching losses and heat generation issues with SiC elements.
Innovation Solution
The cooktop employs a SiC element as a switching element, uses different power control methods for each type of cooking vessel, and adjusts operating frequency and duty of switching elements based on vessel type to minimize losses and enhance heating efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single induction heating system is used for both magnetic and non-magnetic vessels, then the system structure is simple, but the heating output varies significantly depending on vessel material
Solution Approach 1:
The system dynamically adjusts operating frequency based on vessel type detection. When a non-magnetic vessel is detected, the frequency is adjusted to a higher range (e.g., 20-100 kHz) to compensate for lower permeability and achieve consistent heating output across different vessel materials
Solution Approach 2:
The controller changes key operating parameters (frequency and duty cycle) based on the detected vessel type. For non-magnetic vessels, both frequency and duty cycle are adjusted to optimize heating efficiency and maintain output consistency
2Productivity
If high-frequency power is applied to heat non-magnetic vessels, then heating capability is improved, but switching losses increase
Solution Approach 1:
The system uses dynamic frequency adjustment combined with duty cycle control to optimize the balance between heating capability and switching losses. The controller adapts operating parameters in real-time based on vessel type and heating requirements
Solution Approach 2:
The inverter uses periodic switching of the SiC elements to generate high-frequency power. By controlling the switching duty cycle and frequency, the system achieves effective heating while managing switching losses through optimized periodic operation
3Speed
If SiC elements are used as switching elements, then switching speed is improved, but heat generation in switching elements increases
Solution Approach 1:
The system replaces traditional IGBT switching elements with SiC (silicon carbide) elements, which offer superior switching speed and lower on-resistance. This substitution enables faster switching and reduced conduction losses, despite the inherent heat generation challenges of high-power semiconductor devices
Solution Approach 2:
A heat dissipation fan is introduced as an intermediary cooling mechanism to manage the heat generated by SiC switching elements. The fan provides active thermal management, allowing the system to operate at high switching frequencies while maintaining safe operating temperatures
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 approach improves heating efficiency for both magnetic and non-magnetic vessels, reduces switching losses, and minimizes heat generation, leading to enhanced user convenience and reduced component deterioration, allowing for miniaturized and cost-effective heat dissipation systems.
Implementation Method 1
when high-frequency power having a predetermined intensity is applied to a coil, eddy current is generated in the object to be heated using magnetic fields generated around the coil so that the object to be heated is heated
Implementation Method 2
an inverter including a plurality of switching elements driven to allow current to flow through the working coil
Data Source
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Figure 5
AI summary
The present disclosure provides a cooktop capable of heating both a magnetic receptacle and a non-magnetic receptacle by a high power output, and capable of switching a driving method of an inverter according to the type of cooking receptacle.