USB-PD Control Unit for Stable Power Supply
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Solution Overview
Problem
The USB-PD standard faces challenges in safely managing power transmission, particularly in preventing repeated hard reset requests due to deviations from normal operating states such as overcurrent, overvoltage, or elevated temperatures, which can lead to unstable power supply and frequent disconnections.
Innovation Solution
An electronic device with a control unit that manages power supply by sending reset requests and controlling the connection between terminals and ground, ensuring safe disconnection and reconnection based on predetermined voltage levels, thereby maintaining a stable power state and preventing repeated errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the USB-PD standard enables power to be transmitted at high levels (up to 100W), then the power supply capability is improved, but the safety and stability of power transmission deteriorates due to risks of overcurrent, overvoltage, and temperature rise
Solution Approach 1:
The patent implements a feedback mechanism where the power receiving apparatus continuously monitors the power transmission state and communicates with the power transmission apparatus. When an abnormal state is detected (overcurrent, overvoltage, temperature rise), the receiving apparatus sends a hard reset request to the transmission apparatus, which then stops power output. This closed-loop feedback ensures high power transmission capability while maintaining safety through real-time monitoring and automatic correction.
2Reliability
If a hard reset is requested when power transmission deviates from normal operating state, then the safety is improved, but the power supply stability deteriorates due to repeated hard reset requests and frequent disconnections
Solution Approach 1:
The patent applies preliminary action by having the power receiving apparatus proactively monitor power transmission parameters and communicate with the transmission apparatus before critical failures occur. The receiving apparatus detects abnormal states (overcurrent, overvoltage, temperature) and sends hard reset requests in advance, preventing catastrophic failures. This preliminary monitoring and communication mechanism stabilizes power supply by avoiding repeated disconnections and ensuring smooth transitions.
Data Source
AI summary
An electronic device comprises an interface including a first terminal that receives power from an external device and a second terminal for communicating with the external device, and at least one processor and/or at least one circuit to perform the operations of a communication unit that communicates with the external device via the second terminal, and a control unit that controls a connection between the second terminal and a ground, wherein in a case that a state of power received via the first terminal is a predetermined state, the communication unit sends a reset request for stopping the supply of power to the external device, and the control unit controls the connection between the second terminal and the ground from a connected state to a disconnected state.