USB Power Allocation Control for Automotive Multi-Port Charging
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Solution Overview
Problem
Current power delivery systems, such as those using USB-IF standards, fail to effectively manage power distribution in automotive environments where input voltages and temperatures vary, leading to inadequate charging performance due to insufficient initial power allocation and lack of optimized power sharing between devices.
Innovation Solution
An intelligent power delivery system that detects changes in total shared capacity and available shared capacity to maximize initial non-power delivery (non-PD) power and subsequently uses power delivery (PD) protocols to allocate power, ensuring devices receive adequate power by adjusting contracted power among ports based on device charging parameters and external conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If USB-IF standard power delivery system is used, then basic power distribution is achieved, but charging performance is insufficient due to inadequate initial power allocation
Solution Approach 1:
The system performs preliminary power allocation by maximizing initial non-PD power to connected devices before PD protocol negotiation begins. This preliminary action ensures devices receive adequate power immediately upon connection, rather than waiting for protocol completion, thereby improving charging performance while addressing the insufficient initial power allocation
Solution Approach 2:
The system dynamically adjusts power allocation between non-PD and PD stages based on device needs and available capacity. The power delivery controller continuously monitors device parameters and environmental conditions, adjusting the contracted power dynamically during and after PD protocol negotiation to optimize charging performance throughout the power delivery process
2Productivity
If fixed power sharing rules are applied, then power distribution is simple to implement, but power allocation cannot be optimized for each device
Solution Approach 1:
The system implements feedback mechanisms where the power delivery controller continuously monitors device parameters (current draw, voltage requirements, temperature) and environmental conditions (input power availability, total shared capacity). Based on this feedback, the controller intelligently adjusts power allocation for each device, optimizing charging performance while managing system complexity through automated closed-loop control
Solution Approach 2:
The system enables devices to effectively request and receive appropriate power levels through the PD protocol negotiation process, where devices communicate their power needs and the controller autonomously allocates power based on available capacity and device priorities. This self-service approach optimizes power allocation without requiring complex manual intervention
3Productivity
If minimum reserve power is allocated to all ports, then power availability is ensured, but charging efficiency is reduced
Solution Approach 1:
The system changes the power allocation parameter dynamically based on device connection status and power availability. Initially, maximum non-PD power is allocated to connected devices. After PD protocol negotiation, the system transitions to PD-based power delivery with adjusted parameters. This parameter change optimizes charging efficiency by eliminating the need to maintain minimum reserve power on all ports simultaneously, while still ensuring power availability when needed
Data Source
AI summary
A method of intelligently allocating power to one or more devices connected to a power delivery system includes detecting an event related to an allocation of power between the one or more connected devices. The method further includes maximizing an initial non-power delivery (non-PD) power provided to at least one of the connected devices based on an available shared capacity (ASC) associated with at least one connected device and also includes allocating power to the at least one connected device using PD protocols.