Induction Hob Control Unit Inactivity Measurement
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Solution Overview
Problem
Induction hob devices face challenges in maintaining high measuring accuracy and preventing electromagnetic interference during inactivity periods due to alternating electromagnetic fields from the power supply unit, which also increases component costs.
Innovation Solution
The control unit deactivates the power supply unit for an inactivity time interval, allowing the receiving unit to access and measure characteristic variables without interference, using simple and cost-effective components, and continuously changing the switching frequency to minimize noise and energy losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power supply unit operates continuously to heat the cooking container, then heating function is maintained, but electromagnetic interference disturbs the receiving unit's measurements
Solution Approach 1:
The control unit implements periodic action by deactivating the power supply unit for specific time intervals (e.g., 1-10 ms) during which the receiving unit performs measurements. This periodic switching between heating and measurement phases allows both functions to coexist without mutual interference, resolving the contradiction between continuous heating and accurate measurement.
2Measurement precision
If the receiving unit operates during power supply activity, then real-time monitoring is possible, but electromagnetic noise reduces measurement precision
Solution Approach 1:
The control unit performs preliminary action by scheduling measurement operations during predetermined inactive periods of the power supply unit. This advance planning ensures that measurements are taken at optimal moments when electromagnetic interference is minimal, maximizing precision without significant time loss.
3Device complexity
If simple components are used in the receiving unit to reduce cost, then device complexity decreases, but susceptibility to electromagnetic disturbance increases
Solution Approach 1:
The control unit acts as an intermediary by managing the temporal separation between power supply operation and receiving unit measurement. This intermediary control allows simple, cost-effective receiving unit components to function accurately by ensuring they operate only when electromagnetic interference is absent, resolving the contradiction between component simplicity and interference susceptibility.
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 achieves high measuring accuracy, reduces electromagnetic interference, and enables efficient energy use by minimizing energy supplied during inactivity periods, ensuring precise detection of cooking container characteristics and optimizing cooking results.
Implementation Method 1
an alternating electromagnetic field resulting from the heating of the cooking container
Implementation Method 2
In an operating state, a control unit controls a power supply unit which, dependent upon the control by the control unit, feeds energy to heating units
Data Source
AI summary
A hob device includes a power supply unit, a receiving unit configured to receive an item of information, and a control unit configured to control the power supply unit in an operating state and to access the receiving unit. The control unit is configured to deactivate the power supply unit in the operating state for an inactivity time interval and to access the receiving unit during the inactivity time interval.