Dynamic Sampling USB Analyzer for Power Event Analysis
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Solution Overview
Problem
Current USB analyzers face challenges in efficiently monitoring and analyzing inrush current and other power-related events on the USB power line, which are crucial for compliance with USB specifications and optimal device performance, often requiring complex hardware and software configurations and high bandwidth usage.
Innovation Solution
A hardware USB analyzer that dynamically adjusts sampling rates based on detected power events, switching to higher resolution sampling during events like inrush current and reverting to lower resolution during stable periods, thereby conserving resources and bandwidth, and triggers data capture accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution sampling is used continuously to monitor power events, then measurement precision is improved, but use of energy and bandwidth increase
Solution Approach 1:
The system dynamically adjusts the sampling rate based on detected power events. During normal operation, a low sampling rate is used to conserve energy. When a power event is detected, the system switches to a high sampling rate to capture detailed event characteristics, then returns to low-rate sampling after the event concludes.
Solution Approach 2:
The sampling rate parameter is changed based on system state. The controller monitors power consumption parameters and adjusts the sampling resolution accordingly - using high resolution only when power events are detected, and low resolution during stable periods, thereby optimizing the balance between measurement precision and energy consumption.
2Measurement precision
If high-resolution sampling is used continuously to monitor power events, then measurement precision is improved, but bandwidth usage increases
Solution Approach 1:
The system dynamically adjusts the sampling rate based on detected power events. During normal operation, a low sampling rate is used to conserve energy. When a power event is detected, the system switches to a high sampling rate to capture detailed event characteristics, then returns to low-rate sampling after the event concludes.
Solution Approach 2:
The sampling rate parameter is changed based on system state. The controller monitors power consumption parameters and adjusts the sampling resolution accordingly - using high resolution only when power events are detected, and low resolution during stable periods, thereby optimizing the balance between measurement precision and energy consumption.
3Measurement precision
If complex hardware and software configurations are used to monitor power events, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The USB analyzer integrates multiple functions into a single device: power event detection, differential current measurement, automated sampling rate adjustment, and USB protocol analysis. This consolidation eliminates the need for separate external monitoring equipment and complex multi-device configurations while maintaining high measurement precision.
Solution Approach 2:
The USB analyzer is designed as a multi-functional instrument that can detect power events, measure current differentials, capture USB traffic, and adjust sampling rates dynamically. This universal design replaces multiple specialized devices, reducing system complexity while preserving the ability to perform precise power event analysis.
Data Source
AI summary
VBUS or other power event based USB analysis is disclosed. Occurrence of a power related event on a monitored bus, such as an inrush current event, is detected. In some embodiments, a rate at which a power related data is sampled at the hardware protocol analyzer is change automatically in response to the power related event being detected. In some embodiments, a capture of a stream of data packets observed on the monitored bus is triggering automatically in response to the power related event being detected.