Isolated Fault Detection Circuit for High-Power Gate Drivers
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Solution Overview
Problem
High-power drive devices in control systems are susceptible to fault conditions that can damage them or the load they control, and existing technologies lack effective fault detection and reporting mechanisms across voltage domains, particularly in high-power applications like AC motor control.
Innovation Solution
A system with integrated fault detection circuits and a feedback communications channel across isolation barriers between voltage domains, allowing for fault detection and reporting, including redundant detection and soft shutdown capabilities, to protect high-power drive devices and improve system safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isolation barriers are used between voltage domains, then safety and protection from damaging currents are improved, but fault detection and reporting capabilities deteriorate due to the blocking of DC signals
Solution Approach 1:
The patent introduces an intermediary communication channel that translates fault conditions from the high-voltage domain into AC-coupled signals that can pass through the isolation barrier. This intermediary mechanism enables fault information to be transmitted across the isolation boundary without direct DC coupling, thus maintaining both safety and detectability.
Solution Approach 2:
The patent replaces direct electrical (DC) signal transmission across the isolation barrier with an alternative communication mechanism that uses AC-coupled signals. This substitution allows fault information to be conveyed without requiring direct conductive paths, thereby maintaining isolation integrity while enabling fault detection.
2Reliability
If redundant fault detection circuits are added, then reliability and safety are improved, but device complexity increases
Solution Approach 1:
The patent combines multiple fault detection functions into a unified communication architecture. By merging the fault detection, signal translation, and communication functions into an integrated system, the patent achieves redundant fault detection capability while minimizing the increase in overall device complexity through functional consolidation.
Solution Approach 2:
The patent designs the communication channel and associated circuits to perform multiple functions: normal control signal transmission, fault condition detection, and fault information reporting. This multi-functionality allows the system to achieve enhanced reliability through redundant detection without proportionally increasing complexity, as the same infrastructure serves multiple purposes.
Data Source
AI summary
A system for controlling a high-power drive device includes a fault detection integrated circuit product configured to provide an indication of a fault condition associated with the high-power drive device to a first terminal in a first voltage domain in response to detecting the fault condition in a second voltage domain. The system includes a gate driver controller integrated circuit product configured to drive a second terminal coupled to a control node in a second voltage domain based on a control signal and an enable signal received from a third terminal in the first voltage domain. The second voltage domain is higher than the first voltage domain. The system may include a redundant fault reporting integrated circuit product or an additional fault detection integrated circuit product configured to detect a second fault condition in the second voltage domain that is different from the fault condition.