Multiphase Controller Resistivity Diagnostics
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Solution Overview
Problem
Existing multiphase power converters face inefficiencies and accuracy issues due to unpredictable changes in power stage resistivity caused by aging, manufacturing defects, and operational abnormalities, which are difficult to predict and adjust for using existing monitoring methods.
Innovation Solution
The implementation of a predictive failure diagnostic system within the multiphase power converter, which includes a multiphase controller with temperature and current monitor signals, an averaging circuit, and a microcontroller that adjusts the PWM signals to account for changes in resistance, allowing for precise detection and correction of abnormal aging effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If existing monitoring methods are used to detect changes in power stage resistivity, then the system can identify abnormal aging effects, but the detection accuracy is insufficient and cannot precisely detect small changes in resistivity
Solution Approach 1:
The patent segments the monitoring function by separating temperature monitoring and current monitoring into distinct circuits, with temperature monitored via a dedicated temperature sensing circuit and current monitored via sense resistors in each phase. This segmentation allows each monitoring channel to be optimized independently, improving overall measurement precision for detecting small resistivity changes.
Solution Approach 2:
The patent implements feedback mechanisms where the microcontroller continuously receives temperature and current data, compares actual values with expected values, and adjusts PWM duty cycles in real-time to compensate for detected resistivity changes. This closed-loop feedback enables precise detection and correction of small resistivity variations that indicate abnormal aging.
2Loss of energy
If the multiphase controller adjusts operation to account for resistivity changes, then the efficiency and lifespan are improved, but the device complexity increases due to additional monitoring and control circuits
Solution Approach 1:
The microcontroller serves multiple functions: it monitors temperature from the temperature sensing circuit, monitors current through sense resistors, calculates resistivity changes, generates PWM control signals, and implements compensation algorithms. By consolidating these functions into a single multi-functional controller, the patent improves system efficiency without proportionally increasing device complexity.
Solution Approach 2:
The patent combines the temperature monitoring circuit and current monitoring circuits into an integrated monitoring system that feeds into a single microcontroller. The sense resistors are integrated into the power stage design, and the temperature sensor is co-located with the power transistors. This merging reduces overall system complexity while enabling comprehensive monitoring to improve efficiency.
3Measurement precision
If temperature and current are monitored in each power stage, then small changes in resistivity can be detected, but the manufacturing complexity and cost increase
Solution Approach 1:
The patent implements self-service monitoring where each power stage inherently provides its own current sensing through integrated sense resistors and temperature sensing through on-chip temperature sensors. The power transistors themselves serve as the sensing elements, eliminating the need for separate external sensing components and simplifying manufacturing while enabling precise resistivity change detection.
Solution Approach 2:
The patent uses identical monitoring circuit topologies for each phase, with sense resistors and temperature sensors following the same design pattern. This modular copying approach simplifies manufacturing by allowing standardized production of monitoring circuits that can be replicated across multiple phases without increasing overall system complexity.
Data Source
AI summary
In one form, a multiphase controller for controlling a plurality of phases using a corresponding plurality of phase controllers includes a plurality of inputs, each for receiving a respective current monitor signal, an averaging circuit for generating an averaged signal representative of an average of current monitor signals received from said plurality of inputs, wherein each phase controller generates an error voltage in response to said averaged signal and said respective current monitor signal, controls a drive signal in response to said error voltage and a control voltage, and provides a digital signal representative of a difference between said error voltage and said control voltage. The multiphase controller provides an adjustment signal representative of said digital signal divided by a corresponding output current for each phase controller, and said adjustment signal adjusts a corresponding error voltage.