Real-Time Current Measurement via Voltage Difference Calibration
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Solution Overview
Problem
Existing information handling systems face challenges in accurately measuring real-time current without incurring substantial power loss or incurring high costs, especially as components with increased clock speed and power consumption require precise current monitoring to prevent damage.
Innovation Solution
A method involving a voltage measurement device that calibrates by measuring the voltage difference between connectors on a motherboard and a power supply unit, computing the resistance of the coupling, and reporting it to measure real-time current, allowing for accurate and efficient current monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If sense components are used to measure current, then current measurement capability is improved, but power loss increases substantially
Solution Approach 1:
The patent uses voltage measurement as an intermediary to indirectly determine current. Instead of measuring current directly with sense components that cause power loss, the system measures voltage across the connector coupling and uses the calibrated resistance value to calculate current (I=V/R). This intermediary approach eliminates the need for direct current sensing and avoids the associated power loss.
Solution Approach 2:
The patent replaces the physical current sensing mechanism with an electrical voltage measurement system. By substituting direct current measurement (which requires physical insertion of sense components into the current path) with voltage measurement across existing connector terminals, the system achieves current measurement capability without the harmful side effects of power loss.
2Measurement precision
If measurement is performed at the power supply, then current measurement accuracy is improved, but cost and speed deteriorate
Solution Approach 1:
The patent makes the voltage measurement device serve multiple functions: it measures voltage for power management purposes and simultaneously provides accurate current measurement through calibration. By calibrating the device to account for connector resistance, the same hardware infrastructure is used for both voltage monitoring and current measurement, eliminating the need for separate measurement systems at the power supply.
Solution Approach 2:
Instead of measuring current directly at the power supply output, the patent inverts the approach by measuring voltage at the connector and using the known resistance to calculate current. This inversion allows the use of existing voltage measurement infrastructure rather than requiring dedicated current measurement hardware at the power supply.
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
This approach enables faster, more accurate real-time current measurement with minimal power usage, reducing the risk of component damage and costs associated with traditional methods.
Implementation Method 1
measuring a real-time voltage difference between a first measurement node located proximate a first connector on a motherboard and a second measurement node located proximate a second connector on a power supply unit... computing a resistance of the coupling between the first and the second connectors based at least on a long-duration averaged current from the PSU and the averaged real-time voltage difference
Data Source
AI summary
A system and method of measuring real-time current is disclosed. The method includes calibrating a voltage measurement device. Calibrating includes measuring a real-time voltage difference between a first measurement node located proximate a first connector on a motherboard and a second measurement node located proximate a second connector on a power supply unit (PSU), the first and the second connectors coupled to provide power to the motherboard. Calibrating further includes averaging the real-time voltage difference for a plurality of measurements; computing a resistance of the coupling based at least on a long-duration averaged current from the PSU and the averaged real-time voltage difference, the resistance varying over time; and reporting the resistance of the coupling to the voltage measurement device. The method also includes measuring a real-time current of the PSU at the voltage measurement device based at least on the resistance of the coupling and the real-time voltage difference.