Capacitive Circuit Connection Loss Detection via Pulsed Signal Analysis
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Solution Overview
Problem
Existing methods for detecting connection loss in circuit parts with capacitive behavior are inadequate as they cannot supply a DC measuring current, making it impossible to monitor safety-relevant bonds connected to such parts.
Innovation Solution
The solution involves sensing and evaluating a pulsed useful signal at the input junction of a circuit part with capacitive behavior, utilizing an evaluating circuit to recognize changes in discharge curves to determine connection status, thereby allowing for reliable connection loss detection without additional hardware or signal generators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a DC measuring current is supplied to detect connection loss, then connection loss detection is possible, but it cannot be applied to circuit parts with capacitive behavior
Solution Approach 1:
The patent changes the measurement parameter from DC current to pulsed signal characteristics. By applying periodic pulses and analyzing the capacitive charging/discharging behavior, the system can detect connection losses in capacitive circuit parts where DC current measurement fails.
Solution Approach 2:
The patent replaces the electrical DC current measurement method with an analysis of temporal signal characteristics. Instead of measuring steady-state current, the system evaluates the time-dependent response of capacitive elements to pulsed excitation, substituting one measurement paradigm for another.
2Measurement precision
If additional signal generators are provided for testing, then connection loss detection accuracy is improved, but hardware complexity and cost increase
Solution Approach 1:
The patent makes the existing useful signal source serve dual purposes: both its original function and connection loss detection. The useful signal already present at the circuit part is repurposed as the test signal, eliminating the need for separate test signal generators and reducing hardware complexity.
Solution Approach 2:
The system uses its own operational signals for self-diagnosis. The useful signal that normally operates the circuit part also serves as the test signal for detecting connection losses, allowing the system to monitor itself without external testing equipment.
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 enables rapid and reliable detection of connection loss with minimal hardware expenditure, ensuring safe and reliable operation by monitoring the capacitive behavior of circuit parts without the need for additional signal generators.
Implementation Method 1
a circuit part having a capacitive behavior
Implementation Method 2
senses the pulsed useful signal that is output by the useful signal source at the input junction of the circuit part having a capacitive behavior
Data Source
AI summary
The disclosure relates to an arrangement for detecting connection loss at a circuit part which has a capacitive behavior and is electrically connected to a useful signal source. The disclosure provides an evaluation circuit which is electrically connected to an input node of the circuit part having a capacitive behavior and detects the pulsed useful signal (UNUTZ), output by the useful signal source, at the input node of the circuit part having a capacitive behavior and evaluates the signal characteristics in order to detect connection loss.