Multi-Phase Converter Controller Thermal Balance
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Solution Overview
Problem
Multi-phase switching converters in CPU power solutions face challenges in achieving thermal balance due to uneven temperature distribution despite balanced phase currents, primarily caused by cooling airflow variations.
Innovation Solution
A controller system comprising a bias current generator, add-subtraction arithmetic units, proportional integrators, and a control circuit that adjusts switching circuit control signals based on temperature and current error signals to regulate output current and achieve thermal balance across phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If phase current is balanced across all phases, then current distribution is uniform, but temperature distribution becomes uneven due to cooling airflow variations
Solution Approach 1:
The patent applies local quality by introducing phase-specific bias currents that differ from phase to phase. Each phase receives a customized bias current based on its thermal conditions, rather than applying a uniform current distribution. This allows each phase to be optimized independently for its local thermal environment, compensating for uneven cooling airflow patterns across different phases.
Solution Approach 2:
The patent implements feedback by continuously monitoring the temperature of each phase and using this information to dynamically adjust the bias currents. The temperature detection unit provides real-time thermal status feedback to the control unit, which then modifies the bias currents to maintain thermal balance. This closed-loop control ensures that temperature uniformity is actively maintained despite variations in cooling airflow.
Data Source
AI summary
A controller used in a multi-phase switching converter, including: a bias current generator that generates a plurality of bias current signals; a temperature balance modulating circuit that generates a plurality of on time signals based on the plurality of the bias current signals; and a logic circuit that generates a plurality of control signals based on the plurality of on time signals. The plurality of the control signals is used to control a plurality of switching circuits of the multi-phase switching converter.