Grounded Shielding Layout for Touch-Safe Wireless Cooking
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Solution Overview
Problem
Induction heating cooking devices experience touch recognition issues due to electromagnetic noise generated during wireless power transfer, leading to potential misrecognition of user inputs on the touch panel.
Innovation Solution
A cooking device with a grounded shielding conductor arranged perpendicular to the printed circuit board between the touch panel unit and the wireless power transmitter, effectively shielding against electromagnetic noise and preventing misrecognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless power transfer is implemented in the cooking device, then power supply convenience is improved, but electromagnetic noise interference increases affecting touch panel operation
Solution Approach 1:
A grounded shielding conductor is introduced as an intermediary element positioned between the wireless power transmitter coil and the touch panel. This conductor acts as a mediator that intercepts and redirects electromagnetic noise to ground, preventing it from reaching the touch panel while allowing the wireless power transfer to function normally.
Solution Approach 2:
The shielding conductor utilizes the electromagnetic noise generated by the wireless power transfer system and redirects it to ground through grounding connections. By converting the harmful electromagnetic interference into a controlled path to ground, the system transforms the harmful effect into a manageable electrical path that protects the touch panel.
2Reliability
If a shielding conductor is added to block electromagnetic noise, then touch panel reliability is improved, but device complexity increases
Solution Approach 1:
The shielding conductor is implemented as a thin conductive layer or foil that can be easily integrated into the existing device structure. This thin-film approach provides effective electromagnetic shielding while adding minimal structural complexity and maintaining a compact form factor.
Solution Approach 2:
The shielding conductor's effectiveness is optimized by adjusting its physical parameters such as conductivity, thickness, and grounding configuration. By carefully selecting these parameters, the system achieves reliable noise protection with minimal material and structural requirements.
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 shielding conductor significantly reduces electromagnetic noise interference, ensuring accurate touch recognition and stable operation of the touch panel even during wireless power transfer and heating processes.
Implementation Method 1
Wireless power transfer (WPT) technology indicates a technology in which a power cord for supplying power to a home appliance or an electric vehicle is removed and replaced wirelessly
Implementation Method 2
an induction cooking device has been widely used by heating a container without a receiving coil, which uses an eddy current induced by a transmitting coil
Implementation Method 3
a grounded shielding conductor arranged perpendicular to the PCB between the touch panel unit and the PCB
Data Source
AI summary
A heating device includes a wireless power transmitter including a transmitting coil, where the wireless power transmitter is configured to wirelessly transmit power to an object disposed thereon through the transmitting coil, a touch panel unit configured to receive a user input, a control printed circuit board (PCB) including a processor configured to control the wireless power transmitter based on a user input received from the touch panel unit, and a grounded shielding conductor arranged perpendicular to the control PCB between the touch panel unit and the control PCB.