Multi-Zone Induction Phase Control for EMC and Noise Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing induction devices face challenges in minimizing interference noises and ensuring compliance with EMC standards and flicker regulations, leading to potential acoustic stress and operator discomfort.
Innovation Solution
The induction device employs a control unit that independently controls multiple induction areas with alternating current frequencies and phase shifts in alternating control intervals to minimize interference, including intermodulations and ripple currents, thereby enhancing compliance and reducing noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If multiple induction areas are operated simultaneously with the same phase, then the device complexity is reduced, but interference noises and EMC compliance issues worsen
Solution Approach 1:
The control unit alternates between first and second control intervals within a control period, applying different phase shifts periodically. This periodic switching reduces continuous interference noises while maintaining simplified control structure
Solution Approach 2:
The phase shifts are dynamically adjusted between different control intervals. The control unit changes the phase relationship between induction areas based on the current control interval, enabling adaptive interference reduction without complex continuous control
2Reliability
If induction areas are operated with phase shifts in alternating control intervals, then EMC compliance and flicker compliance improve, but the device complexity increases
Solution Approach 1:
The control period is segmented into first and second control intervals, each with different phase shift configurations. This segmentation allows compliance with EMC and flicker standards by breaking continuous operation into controlled segments with varying phase relationships
Solution Approach 2:
The phase shift parameters are changed between control intervals. By varying the phase relationship between induction areas in different intervals, the system achieves better EMC and flicker compliance through parameter modulation rather than structural complexity
3Object-affected harmful factors
If heating current frequency is varied for low-noise operation, then acoustic quality improves, but interference noises from intermodulations may worsen
Solution Approach 1:
The control unit employs periodic alternation between different phase shift configurations in alternating control intervals, which reduces continuous interference noises and acoustic stress while managing intermodulation effects through temporal variation
Solution Approach 2:
The phase shifts are dynamically adjusted between different control intervals to optimize acoustic quality while managing interference. The dynamic switching between phase configurations reduces continuous acoustic stress on operators
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 a low-noise operation and improved compliance with EMC standards, reducing acoustic stress and ensuring adherence to statutory directives, while allowing for flexible power output adjustments.
Implementation Method 1
an induction device (10a, 10b, 10c), in particular an induction cooking appliance device, with a plurality of induction areas (12a-18a) which can be controlled independently, and with at least one control unit (20a, 20b), which is provided to repetitively control the induction areas (12a-18a) within a control period (22a, 22b) from a first control interval (26a, 26b) and at least one second control interval (28a, 28b) with at least one alternating current frequency (24a, 24b) and to supply the same with energy
Implementation Method 2
in the first control interval (26a, 26b) the control unit (20a, 20b) operates at least two of the induction areas (12a-18a) with a first phase shift (32a, 32b) in order thus to minimize interference, in particular interference noises resulting from intermodulations
Data Source
AI summary
An induction device includes a plurality of induction areas which can be controlled independently from one another, and a control unit configured to control the plurality of induction areas within a control period from a first control interval and a second control interval repetitively with an alternating current frequency and to supply the plurality of induction areas with energy. The control unit operates in the first control interval at least two of the plurality of induction areas with a first phase shift to minimize interference.