USB Output Voltage Compensation via Feedback Control
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Solution Overview
Problem
Existing USB systems face challenges in maintaining output voltage within the 4.75-5.25 Volt range due to voltage drops caused by internal losses and cable resistance, leading to potential device malfunction or damage, and existing solutions require additional power supplies, increasing costs.
Innovation Solution
A method involving a controller that monitors USB output voltage and adjusts the power supply using a switch and feedback mechanism to maintain the voltage within the standard range by detecting drops and applying corrective voltage adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If USB cables are made shorter or wire cross-sectional area is increased to decrease internal resistance, then voltage drop is reduced, but device flexibility and ease of manufacture are limited
Solution Approach 1:
The patent implements a feedback mechanism where the controller continuously monitors the USB output voltage through a feedback input and adjusts the power supply accordingly. When voltage drops below 4.75V, the controller activates to increase the power supply output, ensuring voltage remains within the 4.75-5.25V range without requiring physical cable modifications
Solution Approach 2:
The system dynamically changes the power supply output parameter based on monitored voltage conditions. The controller adjusts the power supply voltage level in response to detected voltage drops, transforming a static power supply system into a dynamic one that adapts to varying cable resistance and load conditions
2Reliability
If auxiliary power supply is added to compensate voltage drop, then voltage stability is improved, but system cost and complexity increase
Solution Approach 1:
The patent merges the voltage compensation function with the existing USB controller by integrating a feedback input that monitors USB output voltage. This eliminates the need for separate auxiliary power supplies while achieving the same voltage stabilization effect, as the controller itself becomes the compensation mechanism
Solution Approach 2:
The system performs self-diagnosis and self-correction by monitoring its own output voltage through the feedback input and automatically adjusting the power supply when voltage drops are detected. This self-regulating mechanism eliminates the need for external compensation devices
3Reliability
If voltage monitoring and adjustment mechanism is implemented, then voltage stability is improved, but device complexity increases
Solution Approach 1:
The USB controller is given multiple functions: it manages normal USB communication/control and simultaneously monitors voltage levels through the feedback input and adjusts power supply when needed. This multi-functionality avoids adding dedicated voltage control hardware, keeping the system simple while achieving reliable voltage compensation
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
Effectively maintains USB output voltage within the 4.75-5.25 Volt range, preventing device malfunction and damage while avoiding the need for additional power supplies, thus reducing costs.
Implementation Method 1
A method involving a controller that monitors USB output voltage and adjusts the power supply using a switch and feedback mechanism to maintain the voltage within the standard range
Data Source
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AI summary
This invention provides a method and connection circuitry for compensation of output voltage of a data bus (to which a peripheral device is connected) which enables communication between a computer and a peripheral device connected to said computer. Said method enables keeping the USB output voltage above a standard lower limit.