Dynamic PSys Resistor Network for Accurate Power Indication
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Solution Overview
Problem
Existing information handling systems face challenges in accurately indicating instantaneous system power, leading to inefficiencies in CPU operation and increased transients when PSUs are added or removed.
Innovation Solution
A dynamic PSys resistor network is implemented, where the baseboard management controller (BMC) determines the power budget and calculates the number of resistor stages to couple to the ground plane, optimizing the resistor network to manage power levels and prevent voltage exceeding during transient conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed resistor network is used for power indication, then the circuit is simple, but the accuracy is insufficient and transients cannot be managed during power supply changes
Solution Approach 1:
The patent implements a dynamic resistor network where the BMC calculates and configures the number of resistor stages based on real-time power budget and system configuration. This dynamic adjustment allows the system to optimize measurement precision for power indication while adapting to changing power supply conditions, resolving the contradiction between fixed simplicity and adaptive accuracy.
Solution Approach 2:
The system changes the configuration parameters of the resistor network by dynamically adjusting the number of resistor stages coupled to the ground plane. The BMC calculates the optimal configuration based on power budget parameters, enabling the system to maintain high measurement precision across varying operational conditions without requiring a completely complex fixed design.
2Device complexity
If resistor stages are reduced to simplify the network, then device complexity decreases, but transient management capability and voltage level control are compromised
Solution Approach 1:
The dynamic configuration approach allows the system to adjust the number of resistor stages based on operational needs. During transient conditions or hot-swapping events, the BMC can increase the number of stages to improve transient management and voltage control, while during normal operation, fewer stages may be used to simplify the network. This resolves the contradiction between simplicity and reliability.
Solution Approach 2:
The BMC performs preliminary calculation of the optimal resistor network configuration based on the power budget before power supply changes occur. This preliminary action ensures that the resistor network is properly configured to handle upcoming transient conditions, maintaining reliability without requiring a permanently complex design for all possible scenarios.
3Reliability
If the resistor network is configured for maximum power levels, then transient management is improved, but accuracy for lower power levels decreases
Solution Approach 1:
The system dynamically changes the configuration parameters of the resistor network based on the actual power budget and operating conditions. Rather than fixing the network for maximum power levels, the BMC calculates the optimal number of resistor stages for the current operating point, maintaining both transient management capability and measurement precision across the full power range.
Solution Approach 2:
The dynamic adjustment of resistor network configuration allows the system to optimize for the current operating condition rather than being fixed for maximum power levels. This enables the system to maintain high measurement precision at lower power levels while still having the capability to handle transient conditions when needed, resolving the contradiction between transient management and precision.
4Adaptability or versatility
If a static power indication network is used, then the design is simple, but it cannot adapt to hot-swapping of power supplies or configuration changes
Solution Approach 1:
The patent implements a dynamic power indication network controlled by the BMC that can adapt to hot-swapping of power supplies and configuration changes. The BMC continuously monitors system state and recalculates the optimal resistor network configuration, providing adaptability without requiring complex manual reconfiguration or multiple fixed networks.
Solution Approach 2:
The system performs self-configuration through the BMC, which automatically calculates and configures the resistor network based on the current power budget and system state. This self-service capability provides adaptability to power supply changes without requiring external intervention or complex control mechanisms, as the system configures itself based on monitored parameters.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The dynamic resistor network enhances the accuracy of power indication, reduces transients, and ensures efficient CPU operation by maintaining optimal voltage levels even during changes in PSU configuration.
Implementation Method 1
The power indication network may include a first resistor stage to shunt the power indication to a ground plane, and a second resistor stage selectably to shunt the power indication to the ground plane
Data Source
AI summary
An information handling system has a regulator, a power indication network, a PSU, and a BMC. The regulator receives a system power level indication and provides power to a processor based upon the power indication. The power indication network includes a first resistor stage to shunt the power indication to a ground plane, and a second resistor stage selectably to shunt the power indication to the ground plane. The PSU provides the power indication as a current output where a level of current output indicates a power level provided by the PSU. The BMC determines a power budget for the information handling system, calculates a number of resistor stages to couple to the ground plane based on the power budget, when the number is less than or equal to one, selects the second resistor stage to be uncoupled from the ground plane, and when the number is greater than one, to select the second resistor stage to be coupled to the ground plane.