USB PD Source Output Discharge for Electric Arc Suppression
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Solution Overview
Problem
Current USB Type-C power delivery systems face safety concerns due to the risk of electrical arcs when the voltage difference between the power supply pins exceeds 12V, particularly when the power source device is detached from the sink device.
Innovation Solution
The implementation of a PD system with a boost PFC circuit, active clamp flyback converting circuit, and output voltage communication circuit that maintains a stable voltage difference by forming a rapid oscillating discharge path when the power source device is detached, preventing electrical arcs through controlled energy discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the power supply pin Vbus maintains voltage using a storage device in the PD source device, then power delivery capability is improved, but electrical arc risk increases when detached from the PD sink device
Solution Approach 1:
The patent applies preliminary anti-action by detecting the detachment state through configuration channel pins and proactively controlling the storage device to discharge voltage before electrical arc can occur. The control circuit monitors the connection status and preemptively reduces voltage on the power supply pin when detachment is detected, preventing the harmful voltage difference that would cause electrical arcs.
Solution Approach 2:
The patent implements feedback by using configuration channel pins to detect connection status and feeding this information back to the control circuit. The control circuit continuously monitors the voltage difference between power supply pins and adjusts the storage device operation accordingly, creating a closed-loop system that maintains safety while enabling power delivery.
2Productivity
If the voltage level V2 in the PD sink device is allowed to drop rapidly after detachment, then power delivery efficiency is improved, but voltage difference instability increases causing electrical arcs
Solution Approach 1:
The patent applies preliminary action by having the storage device in the PD source device maintain voltage proactively before detachment occurs. This ensures that when detachment happens, the voltage difference remains controlled rather than allowing rapid drops that would create instability and electrical arcs, thus maintaining both efficiency and stability.
Solution Approach 2:
The patent implements equipotentiality by coordinating the voltage levels on both sides of the connection. The storage device and control circuit work together to maintain similar voltage potentials on power supply pins even during detachment transitions, preventing large voltage differences that would cause electrical arcs while allowing efficient power delivery during connected operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Effectively suppresses electrical arcs by maintaining a stable voltage difference and reducing the risk of arc induction when the power source device is detached from the sink device, ensuring safe power delivery.
Implementation Method 1
The transformer is configured to transfer the energy of the first pulsed DC voltage from a primary side to a secondary side for supplying the second pulsed DC voltage
Implementation Method 2
a discharge winding for providing a discharge inductor
Implementation Method 3
a first output capacitor for storing energy of the first pulsed DC voltage
Data Source
AI summary
A power delivery system includes a PD source device and a PD sink device. The PD source device is configured to detect its connection status with the PD sink device and determine whether its power supply is high-voltage operation. When determining that the PD source device is supplying high-voltage power and detecting that the PD source device is detached from the PD sink device, the PD source device is configured to provide an oscillating rapid discharging path for its output capacitor, thereby rapidly reducing its output voltage and suppressing electrical arc.