Lead Wire Detection Circuit Using Comparator Logic
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Solution Overview
Problem
Existing lead wire detection techniques in medical devices, such as ECG and EEG, require high sampling rates for Analog-to-Digital Converters (ADCs), increasing system design complexity and costs due to the need to differentiate between connected and disconnected states based on voltage thresholds, which is inefficient and burdensome.
Innovation Solution
A bioelectric signal detecting circuit incorporating a comparator and logic control module that uses a reference voltage to determine the connection state of lead wires, eliminating the need for high sampling rates by comparing the lead signal with a predefined threshold, thereby simplifying the circuit and reducing hardware complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage threshold comparison method is used for lead wire detection, then lead wire connection status can be determined, but ADC sampling rate must be increased which increases system complexity and cost
Solution Approach 1:
The patent extracts the lead wire detection function from the main ECG signal processing path. A separate detection circuit with comparator is implemented that operates independently from the ADC, allowing detection without burdening the main conversion system with high sampling rate requirements.
Solution Approach 2:
The detection system is segmented into two independent parts: a low-complexity detection circuit using comparator for lead wire status detection, and the main ECG processing system using ADC. This segmentation allows each part to be optimized independently, with the detection part using simple voltage comparison rather than high-rate ADC sampling.
2Reliability
If voltage threshold comparison method is used for lead wire detection, then lead wire connection status can be determined, but ADC sampling rate must be increased which increases cost
Solution Approach 1:
The detection function is extracted from the expensive high-performance ADC system and placed in a separate, low-cost comparator-based circuit. This extraction allows the main ECG system to use a standard, lower-cost ADC while the detection function is handled by a simple, inexpensive voltage comparator and threshold circuit.
3Measurement precision
If high sampling rate ADC is used for lead wire detection, then detection accuracy can be maintained, but burden on ADC increases presenting system design difficulties
Solution Approach 1:
A voltage comparator is introduced as an intermediary device between the lead wire input and the detection logic. The comparator converts the analog voltage signal into a digital logic level output that directly indicates connection status, eliminating the need for the ADC to perform high-rate sampling and complex threshold comparisons.
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 solution allows for efficient and cost-effective detection of lead wire connection states without the need for high sampling rates, reducing system complexity and costs, and enabling integration into a chip, while effectively handling external frequency interference.
Implementation Method 1
the comparator compares the lead signal with the reference voltage and changes an output voltage at an output end of the comparator according to a comparison result
Data Source
AI summary
This disclosure relates to bioelectric signal detecting circuits, lead wire detecting circuits and medical devices. The lead wire detecting circuit may include a reference voltage generator, at least one comparator, and a logic control module, wherein input ends of the comparator are connected to an output end of the reference voltage generator and an signal output end of a lead wire, respectively, for inputting a reference voltage and a lead signal, and the comparator compares the lead signal with the reference voltage and changes an output voltage at an output end of the comparator according to a comparison result; wherein an input end of the logic control module is connected to the output end of the comparator, and the logic control module determines whether the lead wire is in a connected state or disconnected state by the output voltage at the output end of the comparator.