Multiport USB-PD Adapter Buck-Bypass Control for Voltage Drop Reduction
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Solution Overview
Problem
Existing USB power delivery systems face inefficiencies in managing multiple USB ports with varying voltage requirements, leading to suboptimal power management and potential voltage drops across buck circuits.
Innovation Solution
A multiport USB power adaptor system with a flyback converter and buck circuits, controlled by a USB-PD controller, operates in variable-buck-input or buck-bypass modes to dynamically adjust voltage delivery based on port activity and target voltages, ensuring efficient power distribution across multiple USB ports.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single buck circuit is used to deliver power to multiple USB ports, then device complexity is reduced, but voltage drops occur and power delivery efficiency deteriorates
Solution Approach 1:
The power delivery system is segmented into multiple independent buck circuits, with each buck circuit dedicated to a specific USB port. This segmentation eliminates voltage drops that would occur in a shared buck circuit configuration, as each port has its own dedicated power conversion path from the flyback converter.
Solution Approach 2:
The flyback converter is designed as a universal power conversion stage that can deliver power to multiple USB ports through different buck circuits. The controller manages multiple buck circuits that share a common input from the flyback converter, allowing the system to serve multiple functions (powering different ports) while maintaining efficiency.
2Loss of energy
If buck-bypass mode is used for high voltage ports, then power delivery efficiency is improved, but voltage regulation precision deteriorates
Solution Approach 1:
The controller acts as an intermediary that manages the transition between buck-bypass mode and variable-buck-input mode. It monitors voltage conditions and automatically switches between operational modes to maintain both efficiency and precision, using the buck circuit as an intermediary regulation stage when needed.
Solution Approach 2:
The buck circuit operates dynamically, switching between two distinct modes: buck-bypass mode for high voltage ports where efficiency is prioritized, and variable-buck-input mode for ports requiring precise voltage regulation. This dynamic adaptation allows the system to optimize performance based on real-time conditions.
3Manufacturing precision
If variable-buck-input mode is used for voltage matching, then voltage regulation precision is improved, but power delivery efficiency deteriorates
Solution Approach 1:
The controller changes operational parameters by switching between different duty cycles for the buck circuits. In variable-buck-input mode, the duty cycle is dynamically adjusted to achieve precise voltage matching for ports requiring specific voltage levels, accepting the efficiency trade-off only when necessary for voltage precision.
4Manufacturing precision
If multiple independent buck circuits are used for each USB port, then voltage delivery precision is improved, but device complexity increases
Solution Approach 1:
Multiple buck circuits are merged at the input stage, where they share a common power source from the flyback converter. This combining approach reduces overall system complexity compared to completely independent circuits, while still maintaining dedicated voltage regulation paths for each USB port through the individual buck circuits.
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
The system optimizes power delivery by minimizing voltage drops and ensuring stable voltage output across all active USB ports, enhancing efficiency and adaptability to diverse USB-PD specifications.
Implementation Method 1
a flyback-converter operable to receive and convert a first voltage to a second voltage
Implementation Method 2
a first buck circuit comprises a first switch connected between the flyback-converter and the first USB port
Data Source
AI summary
In an embodiment, a method for operating a USB-PD power adaptor comprises operating a first buck circuit comprising a first switch connected between a supply voltage terminal and a first USB port based on a first target voltage and a supply voltage at the supply voltage terminal, responsive to the first target voltage being less than the supply voltage plus an offset voltage, operating the first buck circuit in a variable-buck-input mode to control the first switch according to a first duty cycle based on the first target voltage and the supply voltage to generate the first target voltage at the first USB port, and responsive to the first target voltage being equal to the supply voltage plus the offset voltage, operating the first buck circuit in a buck-bypass mode to maintain an on state of the first switch to generate the first target voltage at the first USB port.