Heat Sink Retainer Verification Using Electrical Continuity Testing
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Solution Overview
Problem
Existing methods for checking the mechanical connection of heat sink hold-down devices to printed circuit boards are complex and prone to inaccuracies, particularly in automated testing, which can lead to cost-benefit issues and unreliable attachment under mechanical stresses.
Innovation Solution
A method involving a first and second electrical contact on the printed circuit board, an evaluation unit with a voltage output and analog or digital input, generating pulsed output voltage signals with edge changes, and checking for correct detection of these edge changes at the input to verify the proper attachment of the heat sink hold-down device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional mechanical testing methods are used to verify heat sink hold-down device attachment, then the testing process becomes complex and time-consuming, but the attachment reliability can be ensured
Solution Approach 1:
The patent replaces complex mechanical testing methods with an electrical testing approach. Electrical test signals are conducted through the heat sink hold-down device to verify its mechanical attachment to the printed circuit board. This substitution simplifies the testing process while maintaining reliability, as the electrical continuity test directly indicates proper mechanical attachment without requiring complex mechanical measurement equipment.
2Device complexity
If automated electrical testing is implemented to simplify the verification process, then testing complexity is reduced, but measurement accuracy may be compromised
Solution Approach 1:
The patent implements a feedback mechanism where the electrical test signal sent through the heat sink hold-down device returns information about the attachment status. The evaluation unit analyzes the returned electrical signal to determine whether the hold-down device is properly attached to the printed circuit board. This feedback loop ensures accurate measurement verification while maintaining automated simplicity, as the electrical signal provides direct information about mechanical attachment quality.
3Measurement precision
If multiple electrical test signals are used to improve measurement accuracy, then attachment verification reliability increases, but the testing time increases
Solution Approach 1:
The patent employs periodic electrical test signals with different characteristics (such as different frequencies or pulse widths) to test the heat sink hold-down device attachment. By using periodically varying test signals rather than continuous testing, the method achieves accurate attachment verification while minimizing testing time. The periodic nature of the signals allows for efficient data collection and evaluation within a compressed time frame.
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 simple and accurate verification of the mechanical connection of the heat sink hold-down device to the printed circuit board, ensuring a reliable attachment and reducing the risk of faulty installations.
Implementation Method 1
generating an electrical voltage at the analog or digital input of the evaluation unit using the voltage supply device
Data Source
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AI summary
The invention relates to a method for verifying a mechanical connection of a heat sink retainer (2) of a heat sink arrangement (1) comprising a heat sink (3) and at least one component (6) to be cooled, with a printed circuit board (4), comprising the steps a) providing a first electrical contact (104) and a second electrical contact (105) in or on the printed circuit board (4) with which the heat sink retainer (2) can be connected, b) providing an evaluation unit (100) with an analog or digital input (101) which is connected to a power supply device and to the first electrical contact (104), c) generating an electrical voltage at the analog or digital input (101) of the evaluation unit (100), d) checking whether the electrical voltage at the analog or digital input (101) is a high-level voltage or a low-level voltage.