USB Type-C Power Delivery Bypass Path for Dead Battery Negotiation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing USB Type-C power delivery system faces challenges in initiating power negotiation under a dead battery condition, where the limited capability of 15 watts restricts the ability to power mobile devices effectively, and accessing the port manager and firmware becomes difficult when the main system is not powered.
Innovation Solution
A bypass power path is introduced to supply power to the port manager, allowing it to access non-volatile memory independently and manage power states, while a primary power path is used for system boot, enabling the port manager to negotiate higher voltage and current during a dead battery condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the USB VBUS voltage power supply stays at default state of 5 volts to maintain compatibility, then device compatibility is improved, but power delivery capability deteriorates (limited to less than 15 watts)
Solution Approach 1:
The patent implements dynamic voltage negotiation through USB Power Delivery protocol, allowing the system to transition from static 5V default state to dynamic voltage/current adjustment. The port manager and port controller enable real-time negotiation to determine optimal power delivery levels based on device requirements, resolving the contradiction between compatibility and power capability.
2Power
If power delivery negotiation is initiated to achieve higher power output, then power delivery capability is improved, but system complexity increases (requiring active port manager and negotiation protocols)
Solution Approach 1:
The patent segments the power delivery system into distinct functional components: hardware portion (port controller TCPC) and software portion (port manager TCPM). This segmentation allows each component to have specialized responsibilities, making the complex power negotiation process more manageable and maintainable while enabling higher power delivery capabilities.
3Adaptability or versatility
If the port manager accesses non-volatile memory through the main system during dead battery condition, then power management capability is improved, but reliability deteriorates (access becomes difficult when main system is not powered)
Solution Approach 1:
The patent introduces a bypass power path as an intermediary mechanism that directly powers the port manager from the USB connector without requiring the main system to be powered. This bypass path includes a bypass voltage regulator that provides stable power to the port manager, enabling reliable access to non-volatile memory and firmware even when the main system is in dead battery condition.
4Reliability
If the bypass power path is enabled to power the port manager independently, then reliability is improved (port manager can function without main system power), but power consumption increases (additional power path requires power delivery)
Solution Approach 1:
The patent implements partial action by providing power to only the essential components (port manager and bypass voltage regulator) through the bypass power path, rather than powering the entire main system. This selective powering approach maintains reliability for power management functions while minimizing overall power consumption during dead battery conditions.
Data Source
AI summary
In some examples, a power delivery system includes a primary power path to provide power to a computing system. The power delivery system also includes a bypass power path. A port manager is to disable the primary power path and to enable the bypass power path in response to a dead battery condition.