USB-PD Policy Engine Startup Procedure for Power Delivery
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Solution Overview
Problem
The USB Power Delivery (USB-PD) protocol can become stuck in a low power state when no external signal is applied to the USB cable, leading to issues with transitioning from an unpowered state to a check internal power state, especially when the device is not connected to a USB-PD capable device or when the battery power is low.
Innovation Solution
Incorporating a USB-PD controller and a policy engine that determines whether the USB-PD port is ready to power the USB cable, transitioning it into a check internal power state when ready, and using a device policy manager to manage operational states, ensuring the port can deliver power effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the USB-PD port remains in an unpowered state without external signal, then power consumption is reduced, but the port becomes stuck and cannot transition to power delivery state
Solution Approach 1:
The policy engine performs preliminary checks to determine if the USB-PD port is ready to power the cable before transitioning from unpowered state, preventing the port from getting stuck by proactively verifying power readiness conditions
Solution Approach 2:
The policy engine continuously monitors the USB-PD port state and provides feedback to the USB-PD controller, enabling automatic state transitions based on real-time conditions such as battery charge level and power delivery readiness
2Reliability
If the USB-PD port transitions to check internal power state immediately, then power delivery readiness is verified, but unnecessary transitions occur when not connected to USB-PD capable device
Solution Approach 1:
The state transition behavior is made dynamic based on connection status - the policy engine adapts its decision-making process depending on whether a USB-PD capable device is detected, avoiding rigid automatic transitions in all scenarios
Solution Approach 2:
The policy engine autonomously determines whether state transitions are appropriate by evaluating connection status and power readiness conditions, eliminating the need for external control signals to manage state transitions
Data Source
AI summary
An electronic device including a universal serial bus power delivery (USB-PD) port for at least the delivery of power, and a USB-PD controller to control a state of power delivery by the USB-PD port out of a plurality of states, wherein the USB-PD controller transitions the USB-PD port from an unpowered state to a check internal power state when the USB-PD port is ready to power the USB cable.