Induction Hob Control Loop for Stable Power Under Coupling Changes
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Solution Overview
Problem
Induction hobs experience significant power losses due to periodic power interruptions caused by changes in the coupling conditions between the induction coil and cookware, which can lead to reduced lifetime of switching elements and increased power losses.
Innovation Solution
A control loop method is implemented to detect coupling changes between the induction coil and cookware, using frequency and power information to calculate relation coefficients, allowing for adaptive adjustment of operating parameters without interrupting power provision, thereby minimizing power losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If periodic power interruptions are implemented to measure coupling characteristics and adapt off-time, then the coupling conditions are monitored and switching element protection is ensured, but significant power losses occur
Solution Approach 1:
The patent implements continuous power delivery to the induction coil without periodic interruptions. The control entity continuously monitors coupling characteristics during active power delivery and dynamically adjusts the off-time parameter in real-time, eliminating the need to stop power provision for measurements. This maintains continuous heating while adapting to changing coupling conditions, thereby resolving the contradiction between reliability monitoring and energy loss.
Solution Approach 2:
The patent employs a feedback mechanism where the control entity continuously receives coupling information during active power delivery, processes this information to determine optimal off-time values, and adjusts the switching element parameters accordingly. This closed-loop feedback system enables real-time adaptation without interrupting power flow, allowing the system to maintain switching element protection while avoiding the energy losses associated with periodic power interruptions.
2Duration of action of stationary object
If off-time is extended to avoid damages at switching elements, then switching element lifetime is improved, but power delivery continuity is reduced
Solution Approach 1:
The patent dynamically adjusts the off-time parameter based on real-time coupling conditions rather than using a fixed extended off-time. The control entity continuously monitors coupling characteristics and adapts the off-time value to the minimum required for switching element protection, reducing unnecessary idle time while ensuring element safety. This dynamic adjustment maintains switching element lifetime without excessively reducing power delivery continuity.
Solution Approach 2:
The patent changes the off-time parameter adaptively based on coupling conditions. Instead of using a conservative fixed off-time that reduces productivity, the system adjusts this parameter in real-time according to actual coupling characteristics, allowing shorter off-times when coupling is good and longer off-times when coupling degrades, thereby optimizing both switching element protection and power delivery continuity.
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
The method effectively detects minor coupling changes, reducing unnecessary power interruptions and maintaining stable power delivery to the cookware, thus extending the lifespan of switching elements and optimizing energy efficiency.
Implementation Method 1
induction coil placed below a hob plate in order to heat a piece of cookware
Implementation Method 2
heating a piece of cookware by induction
Data Source
AI summary
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