Anti-Arcing Circuit for Power Adapter Connection Safety
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Solution Overview
Problem
Mobile computing devices face challenges in efficient power management and battery life extension due to small form factors, which can lead to arcing issues when connecting or disconnecting power adapters, potentially reducing connector lifespan and posing safety hazards.
Innovation Solution
The implementation of anti-arcing circuits that restrict power supply until a full connection is established, using detection and operational modes to prevent arcing by suppressing power in detection mode and switching to operational mode upon successful connection, thereby mitigating arcing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If power supply is enabled during connector connection/disconnection, then power delivery is continuous, but arcing occurs that reduces connector lifespan and creates safety hazards
Solution Approach 1:
The patent applies preliminary action by implementing a detection mode before operational mode. The controller first detects connector presence through a detection circuit, then establishes a safe power threshold, and only after confirmation does it enable full power delivery. This preliminary detection and threshold-setting action prevents arcing by ensuring the connector is properly engaged before high power is applied.
Solution Approach 2:
The patent changes the power parameter dynamically based on connection status. In detection mode, the power threshold is set to a safe low level that prevents arcing. When the connector is detected, the controller transitions to operational mode and adjusts the power threshold to the appropriate operating level. This parameter change from detection threshold to operational threshold resolves the contradiction by adapting power levels to connection reliability.
2Object-affected harmful factors
If power threshold is restricted in detection mode, then arcing is prevented, but power delivery is delayed until connection is confirmed
Solution Approach 1:
The patent uses periodic action through continuous monitoring in detection mode. The controller periodically checks for connector presence and, upon detection, immediately transitions to operational mode with appropriate power threshold adjustment. This periodic detection approach minimizes delay by continuously watching for the connection event rather than waiting for a fixed time interval.
Solution Approach 2:
The patent implements feedback through the detection circuit that continuously monitors connector status and provides feedback to the controller. When the connector is detected, the feedback signal triggers immediate transition to operational mode and power threshold adjustment. This feedback mechanism eliminates unnecessary delays by responding instantly to connection events.
3Reliability
If connector presence detection is implemented, then safe power delivery is ensured, but device complexity increases with additional detection circuits and control logic
Solution Approach 1:
The patent applies universality by designing the detection circuit to serve multiple functions: it detects connector presence, determines connection reliability, and provides input for power threshold adjustment. The same detection infrastructure supports both safety functions and power management functions, reducing overall device complexity compared to having separate dedicated circuits for each function.
Solution Approach 2:
The patent merges the detection circuit and power management control logic into an integrated system. The controller unit combines the detection processing and power threshold control in a single integrated component rather than using separate discrete circuits. This merging reduces device complexity by consolidating multiple functions into unified hardware and software modules.
Data Source
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AI summary
Anti-arcing circuits (120, 310) are described herein that are configured to prevent or substantially mitigate arcing when a power adapter (118) is connected/disconnected from a client device (102). The anti-arcing circuit (120) restricts power supplied when a connection of a connector (304) of a power adapter to the adapter interface (306) is not fully established. The anti-arcing circuit is further configured to detect when a connection is made and remove the restriction to supply power for operations of the client device. In one approach, the anti-arcing circuit includes two different paths and components associated with a detection mode and operational mode respectively. In the detection mode, power supply is suppressed and a current pulse may be sent to determine if a connection is established. If current is detected, a switch is made to operational mode and power for normal device operations is supplied.