Induction Heating Resonant Circuit for Quiet Small-Vessel Heating
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Solution Overview
Problem
Induction heating apparatuses face challenges in suppressing noise and improving heating performance for small-sized cooking vessels or those made of materials with low magnetic permeability.
Innovation Solution
The induction heating apparatus incorporates a specific circuit configuration with a power supply module, switching elements, diodes, capacitors, and a heating coil, where a controller manages the switching operations to optimize current flow and resonance, reducing noise and enhancing heating efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional induction heating circuit is used, then the heating apparatus can operate, but noise is generated and heating performance for small-sized or low-magnetic-permeability vessels is poor
Solution Approach 1:
The patent modifies circuit parameters including adding a third capacitor connected to the second node and ground node, adjusting switching element timing, and optimizing inductor values to change the resonant frequency and current waveform characteristics, thereby reducing noise while improving heating performance for small or low-magnetic-permeability vessels
Solution Approach 2:
The patent introduces a third capacitor as an intermediary component that mediates the resonant circuit behavior, allowing better control of current flow through the heating coil and reducing electromagnetic interference and noise while maintaining effective heating
2Productivity
If the heating coil current is increased to improve heating performance, then small-sized vessels heat better, but noise increases and energy loss increases
Solution Approach 1:
The patent employs periodic switching of the first and second switching elements in a controlled sequence, creating a resonant oscillating current that efficiently heats small vessels while the periodic nature allows for noise cancellation through synchronized switching of complementary circuits
Solution Approach 2:
The patent implements a controller that monitors the heating process and adjusts the switching element timing and duty cycles based on detected conditions, providing feedback control to optimize heating performance while minimizing noise generation through adaptive parameter adjustment
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 effectively suppresses noise and improves the heating performance of small-sized or low-magnetic-permeability cooking vessels by optimizing current flow and resonance, ensuring efficient energy transfer to the heating coil.
Implementation Method 1
a heating coil that generates a magnetic field when current is applied thereto. When a current is applied to the heating coil and a magnetic field is generated, a secondary current is induced in the cooking vessel
Implementation Method 2
Joule heat is generated by a resistance component of the cooking vessel itself
Implementation Method 3
a controller manages the switching operations to optimize current flow and resonance, reducing noise and enhancing heating efficiency
Data Source
AI summary
An induction heating apparatus includes: a power supply module having a first terminal and a second terminal; an inductor connected between the first terminal and the first node; a first switching element connected between the first node and the second node; a first switching element connected between the first node and the second node; a first reverse-parallel diode connected to the first switching element; a second switching element connected between the first node and a ground node; a second reverse-parallel diode connected to the second switching element; a first diode having a cathode connected to the second node and an anode connected to the second terminal; a second diode having a cathode connected to the second terminal and an anode connected to the ground node; a first capacitor connected to the second node and the third node; a second capacitor connected to the third node and the ground node; a third capacitor connected to the second node and the ground node; and a heating coil connected between the first node and the third node.