Load Drive Apparatus With Leakage Current Detection For Dielectric Strength Diagnosis
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Solution Overview
Problem
In load drive apparatuses using deep trench isolation (DTI) for semiconductor chips, excessive surges due to open or short failures can lead to breakdowns, and the miniaturization of DTI films reduces dielectric strength voltage, making it difficult to maintain reliable electrical isolation and diagnose potential failures.
Innovation Solution
Incorporating first and second leakage current detection elements within and outside the DTI region, respectively, and a failure detection unit to determine if the dielectric strength voltage has lowered due to disturbance surges or aged deterioration, allowing for diagnosis and potential switching to a redundant system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If DTI film thickness is reduced for miniaturization, then integration density is improved, but dielectric strength voltage decreases making electrical isolation unreliable
Solution Approach 1:
The patent applies preliminary action by forming detection elements before actual operation to monitor DTI health. Leakage current detection elements are built into the structure in advance, enabling early detection of dielectric strength degradation before complete failure occurs, thus maintaining reliable electrical isolation even with miniaturized DTI films.
Solution Approach 2:
The patent implements feedback through leakage current detection elements that continuously monitor the electrical isolation status of DTI. The detection unit receives leakage current signals and provides feedback about DTI health status, enabling real-time assessment of dielectric strength and prompt response to potential failures.
2Reliability
If DTI is used for noise blocking and potential difference maintenance, then electrical isolation is improved, but susceptibility to surge-induced breakdown increases
Solution Approach 1:
The patent applies preliminary anti-action by preparing countermeasures against surge damage before it occurs. Redundant load drive output units are built in advance, and leakage current detection elements are positioned to detect surge-induced leakage before complete breakdown happens, enabling protective actions to prevent catastrophic failure.
Solution Approach 2:
The patent implements beforehand cushioning by creating a protective monitoring system that cushions against surge damage. The leakage current detection elements act as early warning sensors that detect the effects of surges on DTI, allowing the system to take protective measures before complete isolation failure occurs, thus cushioning against the full impact of surge events.
3Difficulty of detecting and measuring
If leakage current detection elements are added for DTI monitoring, then failure diagnosis capability is improved, but device complexity increases
Solution Approach 1:
The patent applies merging by combining the leakage current detection elements with existing DTI structures. The detection elements are integrated into the same semiconductor substrate and share common fabrication processes with the main circuit, merging monitoring functionality with the primary isolation structure rather than adding completely separate monitoring systems.
Solution Approach 2:
The patent implements universality by designing leakage current detection elements that serve multiple functions. These elements not only detect leakage current for failure diagnosis but also provide information about DTI health status, enable predictive maintenance, and can trigger protective actions, making a single addition serve multiple diagnostic and protective purposes.
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 reliable diagnosis of dielectric strength voltage issues and improves the reliability of load drive apparatuses by detecting failures and switching to redundant systems, ensuring continued operation and maintaining electrical isolation.
Implementation Method 1
a first leakage current detection element provided in the first region, a second leakage current detection element provided in the second region, and a failure detection unit that determines a failure of the load drive output unit
Data Source
AI summary
Provided are a load drive apparatus in which a semiconductor chip using DTI for inter-element separation is mounted, the load drive apparatus being capable of diagnosing a dielectric strength voltage of the DTI and highly reliable and a failure diagnosis method of the load drive apparatus. There is provided a load drive apparatus in which a semiconductor chip is mounted. The semiconductor chip includes a load drive output unit formed on a semiconductor substrate. The load drive output unit has a first region where an MOSFET that controls load driving is formed and a second region insulated and separated by DTI from the first region and includes a first leakage current detection element provided in the first region, a second leakage current detection element provided in the second region, and a failure detection unit that determines a failure of the load drive output unit.