Saravana Sankar, Subramaniam, Kovar, Stanislav, Dawson, John F orcid.org/0000-0003-4537-9977 et al. (1 more author) (2024) Analysis of Conducted Emission with Influences of Operating Frequencies and Amplitudes of a Self-Oscillating Capacitive Touch Sensing Circuit. In: EMC Europe 2024. EMC Europe .
Abstract
In the rapidly evolving field of human-machine interfaces (HMI), particularly in the realm of touch screen technologies, capacitive touch sensing has gained prominence due to its superior flexibility and cost-effectiveness compared to other touch interfaces, such as resistive-based methods, infrared touch sensors, and surface acoustic wave sensors. However, this advancement comes with increased emission and susceptibility to Electromagnetic Interference (EMI) and similar disturbances, notably due to factors like operating sensing frequency and voltage. The previous research underscored the challenges of Electromagnetic Emission and some drawbacks of operating capacitive sensors at higher excitation frequencies. Characteristics of traditional capacitance to digital circuits like sigma-delta capacitive sensing circuits operate at higher frequencies, thus producing challenges in terms of emission and susceptibility. This paper offers a detailed assessment of the conducted electromagnetic emissions in a self-oscillating capacitance-to-time converter. The study primarily investigates how conducted emission characteristics change in response to the sensing circuit's operating frequency and voltage variations. The oscillating capacitive sensing circuit conducts sensing with a single clock cycle, thus mitigating some of the issues associated with the traditional capacitive sensing circuits, such as sigma-delta capacitive sensing, which generally require a higher frequency of operations. The results indicate that as the sensing frequency and the operating voltage decrease, the conducted emission of the sensor improves; this phenomenon can be particularly beneficial in high EMI environments like the automotive industry, where capacitive touch sensors are placed close to sensitive electronics.
Metadata
Item Type: | Proceedings Paper |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | This is an author-produced version of the published paper. Uploaded in accordance with the University’s Research Publications and Open Access policy. |
Dates: |
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Institution: | The University of York |
Academic Units: | The University of York > Faculty of Sciences (York) > Electronic Engineering (York) |
Funding Information: | Funder Grant number EUROPEAN COMMISSION EP/X033481/1 |
Depositing User: | Pure (York) |
Date Deposited: | 31 May 2024 11:30 |
Last Modified: | 21 Nov 2024 00:22 |
Status: | Published |
Series Name: | EMC Europe |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:212877 |
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