IPMM Module for PSU Current Sharing Optimization
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Solution Overview
Problem
Conventional power supply unit (PSU) current sharing systems in multi-power supply systems face challenges with high current sharing errors and require complex and expensive feedback circuitry, making them inefficient and costly, especially when dealing with varying distribution impedances across different platforms.
Innovation Solution
The implementation of an In-System Power Monitoring and Management (IPMM) module that monitors output values of multiple PSU units, adjusts settings such as distribution impedance, droop voltage, and set voltage increment values to optimize current sharing performance, using a control circuit with transistor-based OR'ing and current amplifiers to reduce complexity and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional passive current sharing schemes are used, then the system structure is simple, but the current sharing error is high (±10% or more) and one PSU must exceed 100% load rating
Solution Approach 1:
The patent implements an active current sharing scheme where each PSU monitors its own output current and communicates with a controller that adjusts the PSU's output characteristics. The controller receives current feedback from each PSU, calculates the optimal current sharing ratio, and sends control signals back to adjust the PSUs' output voltages or impedances, achieving precise current sharing (±2% error) while maintaining balanced load distribution.
Solution Approach 2:
The system dynamically changes operating parameters (output voltage, impedance, or current reference values) of each PSU based on real-time monitoring and controller calculations. By adjusting these parameters, the system optimizes current sharing distribution across multiple PSUs, ensuring each operates within its rated capacity while maintaining high precision current sharing.
2Measurement precision
If conventional active current sharing schemes are used, then the current sharing accuracy is improved, but the feedback circuitry becomes complex and expensive
Solution Approach 1:
The patent combines multiple functions into integrated circuits and modules: current sensing, analog-to-digital conversion, digital signal processing, and control signal generation are merged into a unified controller architecture. This integration reduces the number of discrete components, simplifies the feedback circuitry, and lowers overall system complexity while maintaining high current sharing accuracy.
Solution Approach 2:
The system replaces complex analog feedback circuitry with digital control mechanisms. Current feedback is converted to digital signals, processed through digital algorithms in a microcontroller or DSP, and control adjustments are made through digital-to-analog conversion. This substitution of digital for analog reduces component count, improves precision, and simplifies the overall feedback system architecture.
3Adaptability or versatility
If different current sharing motherboard platforms are used, then various applications can be supported, but inconsistent distribution impedances make use across a portfolio of applications problematic
Solution Approach 1:
The system employs dynamic impedance compensation where the controller continuously monitors the actual current sharing performance and adjusts PSU output impedance in real-time to compensate for variations in distribution impedance. This dynamic adjustment allows the system to adapt to different motherboard platforms and cable configurations while maintaining consistent current sharing accuracy across all applications.
Solution Approach 2:
The patent implements a universal control algorithm that can operate across different PSU configurations and motherboard platforms. The system automatically detects platform characteristics and adjusts its control parameters accordingly, providing consistent current sharing performance whether the PSUs are connected via different cable types, through different motherboard trace impedances, or in different topological configurations.
Data Source
AI summary
Methods and systems for power supply unit (PSU) current sharing may include an In-System Power Monitoring and Management (IPMM) module monitoring an output value of a first power supply unit in a multi-power supply system. In an embodiment, the IPMM module may monitor an output value of a second power supply unit in the multi-power supply system. Additionally, the IPMM module may monitor an output performance parameter for the multi-power supply system. Furthermore, the IPMM module may adjust a setting of at least one of the first power supply unit and the second power supply unit for optimization of a current sharing performance parameter of the multi-power supply system. In various embodiments, the setting may include a droop voltage value, a distribution impedance value, or a set voltage increment value of at least one of the first power supply unit and the second power supply unit.