Fault-Tolerant Multiphase Voltage Regulator Self-Test
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Solution Overview
Problem
Conventional multiphase buck converters are not well-suited for phase redundant operation, failing to maintain output regulation and current or power delivery when one or more phases experience a non-catastrophic failure.
Innovation Solution
A fault-tolerant multiphase voltage regulator with a controller that detects and disables faulty power stages, generates a throttling signal to indicate faulty conditions, and communicates this to the processor, allowing continued voltage regulation and reduced operation with remaining power stages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If conventional multiphase buck converters use parallel architecture for high current delivery, then power delivery capability is improved, but fault tolerance capability deteriorates
Solution Approach 1:
The multiphase buck converter is divided into independent power phases, each capable of operating autonomously. The controller separately controls switching signals for each phase and can independently detect faults in individual phases, allowing other phases to continue operating when one phase fails, thus maintaining fault tolerance while preserving high power delivery capability
Solution Approach 2:
The controller continuously monitors operational parameters of each power phase and detects faults in real-time. When a fault is detected in one phase, the controller receives feedback and automatically adjusts by disabling only the faulty phase while maintaining operation of healthy phases, ensuring the system adapts to maintain reliability without sacrificing overall power delivery
2Reliability
If multiphase buck converters operate with faulty phases, then system availability is improved, but output voltage regulation deteriorates
Solution Approach 1:
The controller dynamically adjusts its control strategy based on the operational status of each phase. When faults are detected, the controller modifies switching signals for remaining healthy phases to compensate for the loss of faulty phases, maintaining output voltage regulation through real-time dynamic adaptation rather than static operation
Solution Approach 2:
The controller changes operational parameters such as duty cycle and switching frequency of healthy phases when faults occur. By adjusting these parameters, the controller compensates for the reduced power delivery capacity of faulty phases and maintains proper output voltage regulation despite the degraded system state
3Difficulty of detecting and measuring
If independent fault detection for each power phase is implemented, then fault detection capability is improved, but device complexity deteriorates
Solution Approach 1:
The controller merges fault detection functions for all power phases into a single integrated control unit. Rather than implementing separate detection circuits for each phase, the controller consolidates monitoring and fault detection capabilities, reducing overall device complexity while maintaining the ability to independently detect faults in each phase through unified control logic
Data Source
AI summary
A fault-tolerant multiphase voltage regulator includes a plurality of power stages, each of which is configured to deliver a phase current to a processor, and a controller. The controller is configured to: control the plurality of power stages to regulate an output voltage provided to the processor; detect and disable a faulty power stage; generate a throttling signal to indicate that one or more of the power stages is faulty and disabled; communicate the throttling signal to the processor over a physical line running between the processor and the controller; and place the multiphase voltage regulator in a self-test mode in which the processor is operated at a known computational load and the controller operates each power stage independently to determine if any of the power stages is faulty under the known computational load. A corresponding method of operating a fault-tolerant power distribution system is also described.