Power Multiplexer Switching for Undervoltage Prevention
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Solution Overview
Problem
Existing power management systems face challenges in efficiently switching circuits between multiple power rails with different supply voltages, particularly due to inaccuracies in comparators and latency in control circuits, which can lead to undervolting and inefficiencies.
Innovation Solution
A system that includes a comparator with a comparator offset, voltage dividers, and a control circuit to accurately compare voltage levels and switch circuits between power rails, thereby preventing undervolting and improving efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a comparator is used to compare voltage levels during power rail switching, then voltage comparison function is achieved, but comparator inaccuracies and control circuit latency cause undervolting issues
Solution Approach 1:
The patent applies preliminary action by proactively detecting voltage transitions before they complete and preemptively switching the power multiplexer in advance. The control circuit monitors the first power rail voltage and detects transitions to a second voltage level, then switches the multiplexer to the second power rail before the undervolting condition can occur. This anticipatory approach resolves the contradiction by acting before the comparator accuracy and control latency would normally cause failures.
Solution Approach 2:
The patent implements beforehand cushioning by creating a voltage buffer zone during transitions. The system detects when the first power rail voltage is transitioning to a second voltage level and switches the power multiplexer during this transition window, cushioning against the potential undervolting that would occur if switching waited for the comparator to fully resolve the voltage difference despite its inaccuracies and the control circuit's latency.
2Adaptability or versatility
If power multiplexer switches circuits between power rails with different supply voltages, then power management flexibility is improved, but switching inefficiencies and energy losses occur
Solution Approach 1:
The patent applies feedback by continuously monitoring the voltage level of the first power rail and using this information to control the power multiplexer switching. The control circuit receives feedback about the voltage transition and adjusts the multiplexer state accordingly, enabling efficient switching between power rails with different voltages while minimizing energy losses during the transition process.
Data Source
AI summary
A system includes a comparator having a first input, a second input, and an output. The system also includes a first voltage divider having an input and an output, wherein the input of the first voltage divider is coupled to a first power rail, and the output of the first voltage divider is coupled to the first input of the comparator. The system also includes a second voltage divider having an input and an output, wherein the input of the second voltage divider is coupled to a second power rail, and the output of the second voltage divider is coupled to the second input of the comparator. The system further includes a power multiplexer coupled to the first power rail, the second power rail, and a first circuit, and a control circuit coupled to the output of the comparator and the power multiplexer.