Biometric Sensor Leakage Current Detection During Skin Measurement
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Solution Overview
Problem
Conventional biometric data measuring devices face challenges in detecting leakage currents during use, which can pose safety risks and affect accurate measurement, as manufacturing tests do not reliably identify such issues when the device is attached to the user's skin.
Innovation Solution
A method to detect leakage current by measuring the difference in current magnitudes between the applied and output electrodes of a sensor inserted into the skin, using threshold ranges to differentiate between normal, caution, and warning states, and generating notifications to the user and manufacturer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a biometric information measurement device is used to measure human body information, then non-contact measurement capability is improved, but leakage current may be generated causing measurement errors or device malfunction
Solution Approach 1:
The leakage current detection is performed before the actual biometric measurement to identify and exclude devices with leakage current issues. This preliminary screening ensures that only devices without leakage current problems proceed to measurement, thereby maintaining measurement accuracy while preserving non-contact capability.
Solution Approach 2:
A test voltage signal is introduced as an intermediary to detect leakage current. By applying a known test voltage and measuring the resulting current through the insulation, the system can identify leakage issues without requiring the device to be in actual measurement mode, thus resolving the contradiction between non-contact operation and measurement reliability.
2Device complexity
If insulation performance is not properly checked, then device operation is simplified, but leakage current cannot be detected leading to measurement errors
Solution Approach 1:
The insulation detection function is extracted as a separate, independent test from the main measurement process. This allows the insulation check to be performed as a distinct preliminary step, maintaining operational simplicity by clearly separating the detection phase from the measurement phase, while ensuring measurement precision through prior identification of insulation issues.
Solution Approach 2:
Insulation detection is performed as a preliminary action before actual measurement. This preliminary check identifies devices with insulation problems that would cause leakage current, allowing these devices to be excluded before they can affect measurement accuracy, thus maintaining both operational simplicity and measurement precision.
3Productivity
If leakage current detection is not performed, then measurement efficiency is maintained, but incorrect measurement results occur due to leakage current interference
Solution Approach 1:
Leakage current detection is implemented as a preliminary screening step before actual measurement. This quick detection phase identifies devices with insulation problems, allowing them to be excluded from measurement. The majority of normal devices pass through quickly, maintaining measurement efficiency, while problematic devices are filtered out to ensure measurement accuracy.
Solution Approach 2:
The measurement process is segmented into two distinct phases: a preliminary leakage current detection phase and a subsequent measurement phase. This segmentation allows for efficient processing of normal devices while ensuring that devices with leakage issues are identified and excluded, thereby maintaining both productivity and measurement precision.
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
Enables safe and accurate biometric data measurement by identifying and addressing leakage currents, reducing user risk and ensuring reliable device operation.
Implementation Method 1
measuring a leakage current generated according to a test voltage applied to the insulation
Implementation Method 2
a biometric information measurement device that measures human body information such as a pulse wave using a biosensor excited by high voltage
Data Source
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AI summary
The present invention relates to a method for detecting a leakage current during use of a biometric data measuring device, and more particularly, a method is provided whereby it is possible to detect whether there is a leakage in a current applied to a sensor in a state of measuring biometric data while a part of the sensor is inserted into the user's skin, by comparing the difference in magnitude between an applied current applied via one terminal of the sensor, which is comprised in the biometric data measuring device, and an output current output via the other terminal of the sensor.