Induction Heating Device Sensor Accuracy and Frequency Assignment
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Solution Overview
Problem
Existing induction heating devices face challenges in optimizing performance and operational reliability, particularly in accurately measuring heating currents and efficiently managing heating inductors and frequency units, which can lead to overheating and increased costs.
Innovation Solution
The induction heating device employs two current sensor units of different accuracy levels, with a high-precision first current sensor unit for precise measurements and a cost-effective second current sensor unit for presence detection, allowing for efficient hob control and reduced costs, while also utilizing a switching unit to assign heating inductors to frequency units, thereby reducing the number of frequency units needed and optimizing energy distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-precision current sensor units are used for all heating inductors, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent applies different accuracy classes of current sensor units to different heating inductors based on their specific requirements. The control unit is configured to assign sensor units of appropriate accuracy to each heating inductor, ensuring that high-precision sensors are only used where necessary while lower-precision sensors are used elsewhere, thereby optimizing the overall measurement precision without unnecessarily increasing device complexity and cost.
2Adaptability or versatility
If multiple heating frequency units are used, then power distribution capability is improved, but device complexity and cost increase
Solution Approach 1:
The patent implements a switching unit that enables heating inductors to be dynamically assigned to different heating frequency units. This multi-functional switching mechanism allows a smaller number of frequency units to serve multiple inductors in different configurations, providing the adaptability and versatility of having multiple dedicated frequency units while actually reducing the total number of frequency units required, thereby decreasing device complexity and cost.
3Ease of manufacture
If current sensor units are integrated in power supply, then manufacturing simplicity is improved, but measurement precision for control purposes deteriorates
Solution Approach 1:
The patent separates the current sensing function from the power supply integration by implementing dedicated current sensor units that are specifically designed for measuring heating currents in the heating circuits. These segmented sensor units provide precise measurements of heating currents, which are then fed to the control unit for accurate control decisions, thereby maintaining manufacturing simplicity while significantly improving measurement precision compared to integrated power supply sensors.
4Device complexity
If the number of heating frequency units is reduced, then device complexity and cost are reduced, but operational reliability may deteriorate
Solution Approach 1:
The patent implements dynamic assignment of heating inductors to heating frequency units through a switching unit controlled by a control unit. This dynamic configuration allows the system to adaptively manage the limited number of frequency units, optimizing their utilization and ensuring reliable operation by dynamically routing power to the required inductors based on real-time cooking requirements, thereby maintaining high operational reliability with fewer frequency units.
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 enhances operational reliability, reduces costs, and achieves high operating comfort by allowing for precise control of heating power, preventing overheating, and minimizing the number of heating frequency units required, thus optimizing performance and energy efficiency.
Implementation Method 1
an induction heating device with at least two heating inductors (10a, 12a, 14a, 16a), at least one heating frequency unit (18a, 20a) for supplying the heating inductors (10a, 12a, 14a, 16a) with a heating current
Implementation Method 2
at least one resonance capacitor unit (22a, 24a), wherein at least a first current sensor unit (26a, 28a) and at least a second current sensor unit (30a, 32a, 34a, 36a) are each arranged in at least one resonance circuit
Data Source
Figure 1
Figure 2
Figure 3a~4
AI summary
The invention relates to an induction heating device, comprising at least two heating inductors (10a-f, 12a-f, 14a-f, 16a-e), at least one heating frequency unit (18a-f, 20a-e) for supplying the heating inductors (10a-f, 12a-f, 14a-f, 16a-e) with a heating current, at least one resonant capacitor unit (22a-f, 24a-e), at least one first current sensor unit (26a-e, 28a-e) and at least one second current sensor unit (30a-e, 32a-e, 34a-e, 36a-e), which are each arranged in at least one resonant circuit and provided in order to measure at least one heating-current characteristic value. In order to advantageously optimize an induction heating device of the type in question, the invention relates that the first current sensor unit (26a-e, 28a-e) and the second current sensor unit (30a-e, 32a-e, 34a-e, 36a-e) are of different types.