USB Power Delivery Startup Control with Battery Load Test
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Solution Overview
Problem
Electronic devices conforming to USB Type-C and USB Power Delivery standards may experience power supply interruptions due to unrestricted power reception from a power supply apparatus, leading to insufficient power before the device can stabilize according to USB PD standards.
Innovation Solution
Incorporating a load test unit to determine if the device can start up using battery power and requesting a first voltage from the power supply to restrict power reception, with the restriction canceled upon completion of connection notification, allowing the device to operate safely within USB PD standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electronic device performs USB Type-C standard power supply capability detection process followed by USB PD standard voltage/current determination process, then the device can detect power supply capabilities, but power received from the power supply apparatus cannot be restricted to 2.5 W or less during startup, causing power supply interruption
Solution Approach 1:
The electronic device performs a preliminary power supply capability detection process using USB Type-C standard before the USB PD standard voltage/current determination process. This preliminary action allows the device to detect whether the power supply apparatus can provide stable power before attempting to receive higher power, preventing power supply interruptions during startup.
Solution Approach 2:
The device dynamically adjusts its power reception strategy based on the detection results. During the transition phase, the device can request restricted power (2.5 W or less) when voltage is not 5 V, and request higher power when voltage is 5 V and the power supply apparatus confirms capability. This dynamic adjustment resolves the contradiction between reliability and power reception control.
2Power
If the device requests higher power from the power supply apparatus during startup, then the device can operate with sufficient power, but the device becomes short of power supply before the start of power supply in conformity with USB PD standard, causing instantaneous interruption
Solution Approach 1:
The device performs USB Type-C standard power supply capability detection as a preliminary action before requesting higher power under USB PD standard. This ensures the power supply apparatus is ready to provide stable power before the device increases its power demand, preventing instantaneous interruptions.
Solution Approach 2:
The device uses feedback from the power supply capability detection process to determine the appropriate power request. The detection results provide feedback about the power supply apparatus's capability, allowing the device to adjust its power request accordingly and maintain continuous power supply.
Data Source
AI summary
A device includes a load test unit that determines whether to permit startup of the device using power of a battery supplying power to the device, and a control unit that starts up the device in a case where it is determined to permit startup of the device using the battery and a first voltage is requested of a power supply apparatus to restrict power received from the power supply apparatus. The control unit cancels the restriction of the received power in a case where a notification of completion of connection is received from the power supply apparatus, after the device is started up and a second voltage is requested of the power supply apparatus.