Semiconductor Integrated Circuit Fault Protection via Dynamic Current Control
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Solution Overview
Problem
Conventional semiconductor integrated circuits lack protection for the pre-driver IC, which can lead to destruction due to faults such as sky faults or ground faults, as they do not have mechanisms to manage current flow effectively, potentially causing damage to the IC and external components.
Innovation Solution
Incorporating an adjustment circuit and current source portions that switch between high and low-side current sources to restrict current flow to prevent damage, allowing a large current for high-speed driving and switching to a small current to prevent element destruction during faults, with the adjustment circuit controlling the transition times to ensure safe operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a large current is supplied to the FET gate to improve response performance, then the driving speed and response performance are improved, but the risk of IC destruction due to faults increases
Solution Approach 1:
The patent implements dynamic current control by switching between a first current source (higher current) and a second current source (lower current) based on operational status. The adjustment circuit dynamically adjusts the gate current magnitude: using higher current during normal operation to improve response performance, and switching to lower current when faults are detected to prevent IC destruction. This dynamic adaptation resolves the contradiction between speed and reliability.
Solution Approach 2:
The patent changes the current parameter supplied to the FET gate based on operational conditions. By adjusting the current magnitude from a first level (for high-speed driving) to a second level (for safe operation), the system optimizes both response performance and safety. The adjustment circuit monitors operational status and modifies the current parameter accordingly, resolving the trade-off between speed and reliability.
2Reliability
If protection functions are added to the pre-driver IC, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent combines the protection function with the existing current source structure by integrating an adjustment circuit that manages multiple current sources. Instead of adding separate protection circuits, the system merges protection logic into the current control mechanism, using the same adjustment circuit to both switch between current sources for performance optimization and to implement fault protection, thereby reducing overall complexity.
Solution Approach 2:
The adjustment circuit serves multiple functions: it switches between different current sources to optimize driving performance, monitors operational status, and implements protection functions. This multi-functionality reduces the need for separate dedicated circuits for each function, thereby improving reliability while minimizing the increase in device complexity.
3Reliability
If current restriction is implemented to prevent damage, then the safety is improved, but the driving performance deteriorates
Solution Approach 1:
The patent implements periodic switching between high-current and low-current modes based on fault detection. During normal operation, the system periodically uses higher current to maintain driving performance. When faults are detected, it switches to periodic low-current operation to prevent damage. This periodic adaptation allows the system to maintain high performance during normal conditions while ensuring safety during abnormal conditions.
Solution Approach 2:
The system dynamically adjusts current magnitude based on real-time operational status. The adjustment circuit continuously monitors the system and switches between high-current mode (for optimal driving performance) and low-current mode (for protection). This dynamic control ensures that current restriction is applied only when necessary, maintaining driving performance during normal operation while preventing damage during faults.
Data Source
AI summary
A semiconductor integrated circuit according to an embodiment includes: an output circuit configured to cause a current to flow out from an output terminal to a control target or cause a current to flow in from the control target via the output terminal, based on a control signal; a current source portion provided for the output circuit and configured to be capable of switching a current suppliable to the output terminal; and an adjustment circuit configured to switch a current that the current source portion is caused to generate, based on the control signal.