Piezoelectric Switch Testing via Voltage Development Time
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Solution Overview
Problem
Existing methods for testing circuit assemblies with piezoelectric switches are prone to wear and require a more reliable approach to accurately identify operational or defective states.
Innovation Solution
A method involving a DC current applied to a piezoelectric switch, measuring the time interval for a predetermined voltage to develop, and comparing it against set thresholds to determine the circuit assembly's operational status, using a circuit with a comparator and timer to identify defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If mechanical parts are used for testing circuit assemblies, then the testing method is simple and easy to implement, but the mechanical parts are subject to increased wear over time reducing reliability
Solution Approach 1:
The patent replaces mechanical testing parts with a piezoelectric switch and electronic testing circuit. The piezoelectric switch uses piezoelectric material that generates electrical charge in response to mechanical stress, eliminating the need for mechanical contacts and moving parts in the testing mechanism. This substitution resolves the contradiction by providing wear-free operation (improving reliability) while using solid-state electronic components (managing complexity).
Solution Approach 2:
The patent measures the time interval for voltage development across the piezoelectric switch to determine operational status. By changing the measurement parameter from simple continuity to time-based voltage response, the system achieves more reliable testing that detects degradation before complete failure, resolving the reliability concern while using straightforward electronic measurement circuits.
2Reliability
If a piezoelectric switch is used in the circuit assembly, then wear is reduced, but it becomes difficult to detect and measure the operational status
Solution Approach 1:
The patent introduces an intermediary measurement approach by measuring the time interval for voltage to develop across the piezoelectric switch. This intermediary parameter (time interval) serves as a reliable indicator of the switch's operational status without requiring direct observation of the piezoelectric material itself. The testing circuit acts as an intermediary system that translates the piezoelectric response into a measurable time-based signal.
Solution Approach 2:
The patent transforms the detection problem by changing from direct observation to measuring the time interval for voltage development. This parameter transformation makes the operational status of the piezoelectric switch easily detectable and measurable using standard electronic timing circuits, resolving the detection difficulty while maintaining the reliability benefits of piezoelectric materials.
3Measurement precision
If existing testing methods are used, then the testing process is simple, but the accuracy to identify operational or defective states is reduced
Solution Approach 1:
The patent improves measurement precision by changing from simple continuity or resistance measurement to time-based voltage development measurement. The time interval measurement provides a more sensitive indicator of piezoelectric switch health, enabling detection of degradation before complete failure. This parameter change achieves higher defect detection accuracy using relatively simple electronic timing circuits and voltage measurement components.
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 method provides a reliable means to assess the functionality of piezoelectric switches by distinguishing between operational and defective states, reducing wear and improving testing accuracy.
Implementation Method 1
Piezoelectricity is the electric charge that builds up in certain solid materials and may be released in response to mechanical stress. Applying mechanical pressure to the piezoelectric material causes it output a voltage pulse that can be sensed by electronic circuits.
Data Source
AI summary
A method of testing a circuit assembly that includes a piezoelectric switch may include driving a DC current into the piezoelectric switch. The method may further include measuring the time interval it takes to develop a predetermined voltage across the piezoelectric switch and comparing the measured time interval with a first predetermined time interval and a second predetermined time interval. The method may include identifying the circuit assembly as defective when the measured time interval is either less than the first predetermined time interval or more than the second predetermined time interval, and otherwise identifying the circuit assembly is operational.