Voltage Enable Feedback for Staged Power-On Sequencing
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Solution Overview
Problem
Information handling systems face challenges in optimizing the power-on sequence to prevent inrush currents and unwanted over-current events, particularly when power-hungry devices like NICs, GPUs, and FPGA accelerators are turned on simultaneously, leading to potential electrical issues.
Innovation Solution
A controller-based voltage regulation system that uses a voltage enable sense line to monitor and manage the power-on sequence, ensuring that the output voltage is fully turned on and maintained at a desired level, thereby optimizing the power-on process and reducing inrush currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If multiple power-hungry devices (NICs, GPUs, FPGA accelerators) are turned on simultaneously, then the system can provide full power to all devices, but inrush currents and over-current events occur
Solution Approach 1:
The system performs preliminary actions by enabling voltage regulators in a staged sequence rather than simultaneously. The controller activates voltage regulators one at a time or in groups, allowing each regulator to stabilize before the next is enabled. This preliminary staged activation prevents inrush currents from occurring all at once while still delivering full power to all devices eventually.
Solution Approach 2:
The power delivery system is segmented into multiple voltage regulators that are controlled independently. Instead of treating all devices as a single power delivery unit, the system divides the power delivery function across multiple regulators, each of which can be enabled and monitored separately. This segmentation allows granular control over power delivery timing and prevents system-wide inrush currents.
2Object-affected harmful factors
If voltage regulators are enabled in a staged sequence, then inrush currents are prevented, but the power-on time increases
Solution Approach 1:
The system uses feedback mechanisms to monitor the state of each voltage regulator and device. The controller receives status information from sense lines that indicate whether voltage regulators are fully enabled and whether devices are ready. This feedback allows the controller to optimize the sequencing timing, enabling the next regulator as soon as the previous one is stable, thereby minimizing total power-on time while still preventing inrush currents.
Solution Approach 2:
The power-on sequence is made dynamic rather than static. The timing and pacing of regulator enablement are adjusted based on real-time system conditions and feedback from sense lines. The controller can adapt the sequencing speed, enabling regulators faster when conditions permit and slowing down when stabilization is needed, thus optimizing the balance between preventing inrush currents and minimizing power-on time.
Data Source
AI summary
An information handling system includes a voltage regulator, a device, and a controller. The voltage regulator provides an output voltage to power on the device. The controller includes a voltage enable sense line. The controller provides a signal to enable the voltage regulator on the voltage enable sense line at a first voltage associated with a first state. The controller also monitors a voltage level on the voltage enable sense line, and determines whether the voltage level of the voltage enable sense line has changed to a second voltage level associated with a second state. In response to the voltage level on the voltage enable sense line changing to the second voltage level, the controller detects that the output voltage is fully turned on and provided to the device.