Inductive Switching Test Shunt Controller for Device Protection
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Solution Overview
Problem
Existing inductive switching test systems can be destructive to devices under test and adjacent equipment, leading to collateral damage and unreliable device screening due to mismatched test conditions between wafer sort and package level testing.
Innovation Solution
An apparatus and method that includes an inductive storage device configured to discharge energy into a target device during a wafer level reliability test, with a monitoring module to track voltage and a shunt controller to divert energy if the target device fails, preventing damage to the device and adjacent equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If higher test currents are used to perform more rigorous reliability testing, then device screening effectiveness is improved, but risk of damage to test equipment and adjacent devices increases
Solution Approach 1:
The shunt controller is configured to trigger the shunt device before the target device can fail catastrophically. By monitoring voltage across the target device and detecting early failure indicators (such as voltage collapse or abnormal voltage levels), the system activates the shunt path in advance to redirect energy away from both the target device and adjacent test equipment, preventing collateral damage while maintaining rigorous test conditions
Solution Approach 2:
A shunt device is introduced as an intermediary element that provides an alternative energy path. When the target device fails, the shunt controller redirects energy through this intermediate shunt path rather than allowing it to flow through adjacent test equipment or cause catastrophic failure of the target device, thus protecting the test system while maintaining test effectiveness
2Reliability
If higher energy is discharged into the target device to improve test rigor, then device screening capability is enhanced, but collateral damage to adjacent devices increases
Solution Approach 1:
The system converts the potentially harmful failure energy into a beneficial protective action. When the target device fails under high-energy test conditions, the shunt controller detects the failure state and redirects the failure energy through the shunt device, transforming what would be destructive energy into a controlled energy path that protects adjacent devices while maintaining the integrity of the test process
3Device complexity
If traditional test systems are used without shunt protection, then test system complexity is reduced, but test condition mismatch between wafer sort and package level testing occurs
Solution Approach 1:
The shunt controller enables dynamic adjustment of test parameters during the testing process. By monitoring voltage across the target device and detecting failure states, the system can adaptively change energy discharge parameters and trigger protective actions, allowing wafer sort testing to more accurately replicate package-level and field conditions without requiring overly complex test system architecture
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
The solution allows for more rigorous testing at higher currents without damaging the test equipment or adjacent devices, effectively filtering out defective devices and ensuring reliable packaging by safely managing energy during the testing process.
Implementation Method 1
an inductive storage device configured to discharge at least a portion of energy stored in the inductive storage device into a target device during a wafer level reliability test
Implementation Method 2
a shunt controller configured to trigger shunting of at least a portion of the energy away from the target device
Data Source
AI summary
In one general aspect, an apparatus can include an energy storage device configured to store energy during an unclamped inductive switching test of a target device, and a switch device configured to shunt at least a portion of energy away from the target device in response to the target device changing from a breakdown state to a failure state.