Multi-Zone Induction Coil Timing Control for Noise-Free Heating
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Solution Overview
Problem
Induction heating cooking apparatuses face magnetic field interference noise when multiple induction coils are driven simultaneously due to differing output frequencies, leading to unpleasant noise and potential user discomfort.
Innovation Solution
A cooking apparatus with a processor that controls the frequencies and currents supplied to multiple induction coils, adjusting the strength and timing of currents to maintain a threshold difference and prevent noise, using pulse width modulation to ensure consistent output power and reduce magnetic field interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple induction coils are driven simultaneously with different output frequencies, then each heating area can be heated independently, but magnetic field interference noise occurs
Solution Approach 1:
The patent applies dynamics by making the output frequency of the induction coils adjustable rather than fixed. When multiple heating areas are activated, the controller dynamically adjusts the frequency of at least one induction coil to match another coil's frequency, preventing magnetic field interference while maintaining independent heating capability
Solution Approach 2:
The patent changes the frequency parameter of the induction coils based on operational conditions. When multiple heating areas are in use, the system modifies the frequency parameter to ensure consistency across active coils, thereby eliminating noise while preserving productivity
2Object-affected harmful factors
If the frequency of induction coils is adjusted to prevent noise, then magnetic field interference is reduced, but output power consistency may be affected
Solution Approach 1:
The patent implements feedback control where the controller monitors the operational state of multiple heating areas and adjusts coil frequencies accordingly. The system receives feedback about which heating areas are active and modifies frequency settings to prevent interference while maintaining appropriate power output levels
Solution Approach 2:
The system dynamically adjusts frequency based on real-time operational conditions. When heating areas are activated or deactivated, the controller modifies frequency settings adaptively, ensuring both noise prevention and power consistency are maintained through continuous optimization
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
Prevents noise generation between heating areas, maintains consistent output power, and protects the apparatus from voltage thresholds, ensuring smooth heating without noise and potential damage.
Implementation Method 1
Such induction heating cooking apparatuses can generate Joule heat by resistance components of a cooking container itself by using the principle of induction heating
Implementation Method 2
generate Joule heat by resistance components of a cooking container itself
Data Source
AI summary
A cooking apparatus is disclosed. The cooking apparatus includes a cooking plate including a plurality of heating areas, a plurality of induction coils in locations corresponding to each of the plurality of heating areas in the lower part of the cooking plate, a driver supplying currents to each of the plurality of induction coils, and a processor. The processor is configured to, based on a user instruction for turning on a second heating area among the plurality of heating areas being received while a first heating area among the plurality of heating areas is turned on, stop the supply of a current to a first induction coil corresponding to the first heating area among the plurality of induction coils during a threshold time.