To extend the proposed MOSFET-based Single Event Latchup (SEL) detection and mitigation circuit for multiple SEL-prone devices in a spacecraft system, several strategies can be employed:
Parallel Configuration: The circuit can be replicated for each SEL-prone device, with each circuit connected in parallel to the power supply. Each device would have its own MOSFET Q1 for switching, MOSFET Q2 for current limiting, and associated components for detection and power cycling. This ensures that each device is independently monitored and protected against SEL events.
Shared Detection and Control Logic: A centralized detection and control logic can be implemented, where a single comparator (or multiple comparators) monitors the current across multiple devices. If an SEL event is detected in any device, the control logic can trigger the corresponding MOSFETs to turn off the affected device while allowing others to continue operating normally. This approach reduces component count and complexity.
Dynamic Current Limiting: The design can incorporate adjustable current limiting thresholds for each device based on their specific operational requirements. This can be achieved by using programmable voltage references for VGS of MOSFET Q2, allowing for tailored protection strategies for different devices.
Time-Division Multiplexing: In scenarios where devices can tolerate brief interruptions, a time-division multiplexing approach can be used. The circuit can cycle through devices, applying power to one at a time while monitoring for SEL events. This method can optimize power usage and reduce the overall complexity of the circuit.
Communication Interface: Implementing a communication interface among the circuits can facilitate coordination and data sharing regarding SEL events. This can enhance the overall system reliability by allowing devices to share information about their operational status and SEL occurrences.
By employing these strategies, the circuit design can effectively manage multiple SEL-prone devices, ensuring robust protection and operational continuity in the harsh space radiation environment.