Reconfigurable Voltage Regulator Loops for Hotspot Load Equalization
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Solution Overview
Problem
Voltage regulators in computing systems face challenges such as uneven load distribution, reduced efficiency, and temperature hotspots due to uneven power distribution, and destabilization from parasitic effects, which affect reliability and performance.
Innovation Solution
A control circuit is used to independently adjust voltage regulators based on load conditions, employing a double-loop regulation system with a local and remote sense loop to compensate for parasitic resistance and inductance, and adaptive voltage positioning to equalize load distribution and maintain target voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple voltage regulators are used to power a compute domain, then power supply capacity is improved, but load distribution becomes uneven causing reduced efficiency and temperature hotspots
Solution Approach 1:
The patent implements a control circuit that continuously monitors the load current of each voltage regulator and uses feedback signals to dynamically adjust the operating state of individual regulators. This feedback mechanism enables real-time load balancing, ensuring even distribution of power across multiple regulators and preventing efficiency losses and temperature hotspots.
Solution Approach 2:
The system dynamically adjusts the operating state of voltage regulators based on real-time load conditions. The control circuit can independently modify the duty cycle or switching frequency of each regulator to adapt to changing load requirements, enabling flexible load distribution that maintains high efficiency across varying operational scenarios.
2Device complexity
If traditional single-loop regulation is used, then device complexity is reduced, but voltage accuracy is compromised due to parasitic resistance and inductance
Solution Approach 1:
The patent divides the single regulation loop into two independent control loops: an inner current mode control loop and an outer voltage mode control loop. This segmentation allows each loop to specialize in controlling a specific parameter (current and voltage respectively), enabling accurate compensation for parasitic effects while maintaining manageable system complexity through modular control architecture.
3Loss of energy
If load equalization control is implemented, then load distribution is improved, but control circuit complexity increases
Solution Approach 1:
The control circuit automatically monitors load conditions and adjusts voltage regulator operation without external intervention. The system uses built-in sensing capabilities and integrated control logic to self-regulate load distribution, eliminating the need for complex external control hardware or manual adjustment mechanisms while achieving even load balancing.
Data Source
AI summary
Embodiments herein relate to controlling one or more voltage regulators (VRs) to avoid excessive degradation when a VR increases it current output to supply a hot spot in a compute domain. In one approach, a group of VRs supply current to the domain and each VR's load is monitored to detect an increase in current. A digital controller can reduce the target voltage and/or switching frequency for a VR experiencing an increase in current to equalize the current outputs among the VRs, within a tolerance. In another aspect, a double control loop is used to control a VR. An inner control loop regulates the output of the VR relative to a target voltage and an outer control loop detects the load and adjusts the target voltage and/or switching frequency to avoid excessive degradation.