Isolated Fault Detection Circuit for High-Power Gate Drive Shutdown
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Solution Overview
Problem
High-power drive devices in control systems for applications like AC motor control face challenges in handling fault conditions without damaging the devices or the load, due to substantial turn-on voltages and susceptibility to fault conditions.
Innovation Solution
A system incorporating a fault detection integrated circuit product that provides indications of fault conditions across voltage domains, coupled with a gate driver controller and redundant fault reporting, enables effective detection and reporting of faults, allowing for controlled shutdown or soft shutdown of high-power drive devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high-power drive devices operate with substantial turn-on voltages to deliver high currents, then power delivery capability is improved, but susceptibility to fault conditions increases
Solution Approach 1:
The fault detection circuit continuously monitors voltage conditions before faults can cause damage. By detecting overvoltage, undervoltage, and transient conditions in advance, the system can initiate protective shutdown sequences that prevent damage to high-power drive devices while maintaining their high power delivery capability during normal operation.
Solution Approach 2:
The system implements real-time feedback through fault detection circuits that monitor voltage domains and provide status information to control logic. This feedback mechanism enables the system to respond dynamically to fault conditions, adjusting operation to prevent damage while maintaining reliability during normal high-power operation.
2Reliability
If isolation barriers are implemented between voltage domains to prevent damaging currents, then safety is improved, but communication complexity increases
Solution Approach 1:
The isolation barrier system is designed to perform multiple functions simultaneously: electrical isolation for safety, fault detection across voltage domains, and communication of status information. By integrating these functions into a unified system rather than separate components, the patent reduces overall complexity while maintaining safety and enabling fault detection capabilities.
3Reliability
If fault detection circuits are added to detect fault conditions, then reliability is improved, but device complexity increases
Solution Approach 1:
The fault detection circuit is integrated with the existing isolation barrier and control system rather than being implemented as a separate add-on. The isolation barrier infrastructure is leveraged to provide both isolation and fault detection functions, merging multiple capabilities into a unified system that reduces overall complexity while enhancing reliability.
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.