Avalanche Breakdown Test Apparatus Lock Control
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Solution Overview
Problem
Existing test apparatuses for avalanche breakdown tests of semiconductor switches, such as IGBTs, face challenges in maintaining a locked state to prevent access to the substrate during energy discharge, while accurately detecting when the energy in the inductive load has been fully discharged.
Innovation Solution
A test apparatus with a power supply section, inductive load section, housing section, and lock maintaining section that keeps the opening/closing section locked until the voltage at a predetermined position on the substrate is within a set voltage, ensuring safe access and accurate energy discharge detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the opening/closing section is kept locked during avalanche breakdown testing, then operator safety is improved by preventing access to the substrate, but the ability to access the substrate for maintenance or inspection deteriorates
Solution Approach 1:
The lock maintaining section dynamically adjusts the locked state of the opening/closing section based on real-time voltage detection. When voltage exceeds the safe threshold, the section remains locked; when voltage drops below the threshold, the section can be unlocked. This dynamic control resolves the contradiction by making the locking mechanism adaptive rather than static, ensuring safety during high-voltage operation while enabling access when safe.
2Reliability
If the locked state is maintained until energy discharge is confirmed, then safety is improved, but the time required to complete testing and regain access deteriorates
Solution Approach 1:
The lock maintaining section continuously monitors the voltage at the predetermined position and provides feedback control for the locking mechanism. The system automatically detects when the voltage drops below the safe threshold and updates the locking state accordingly. This feedback mechanism eliminates the need for manual timing or estimation of energy discharge duration, reducing waiting time while maintaining safety through automated, real-time voltage-based control.
3Measurement precision
If voltage detection is continuously monitored to accurately determine when energy is discharged, then detection accuracy is improved, but device complexity deteriorates
Solution Approach 1:
The lock maintaining section utilizes the existing voltage signal already present in the testing circuitry to determine when energy discharge is complete. Rather than requiring a separate, complex detection system, the invention repurposes the existing voltage measurement infrastructure to serve the dual function of both test operation and safety control. This self-service approach achieves accurate detection without proportionally increasing device complexity.
Data Source
AI summary
To detect whether energy accumulated in an inductive load section has been discharged. Provided is a test apparatus that tests a device under test, comprising a power supply section that generates a power supply voltage to be supplied to the device under test; an inductive load section that is provided in a path between the power supply section and the device under test; a housing section that houses a substrate that includes at least the inductive load section; and a lock maintaining section that keeps an opening/closing section, which allows an operator to access the substrate within the housing section, in a locked state when a voltage at a predetermined position on the substrate is greater than a set voltage.