AC Adapter Indicator Light Control via Data Channel
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Solution Overview
Problem
Existing AC adapters for portable Information Handling Systems (IHSs) lack the ability to accurately indicate whether they are properly coupled to the IHS and if the IHS is drawing power, due to indicator lights that remain illuminated regardless of the connection status, leading to ambiguity in charging confirmation.
Innovation Solution
An AC adapter system with a DC cord that supports a data channel for reporting AC adapter attributes, allowing a power port controller to determine the charging state of the IHS and generate an indicator control signal to configure the indicator light, including specifying color and brightness based on the charging state, thereby providing clear charging status feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If indicator lights remain illuminated continuously, then users can see power availability, but charging status cannot be accurately indicated
Solution Approach 1:
The indicator light transitions from a static always-on state to a dynamic state that changes based on connection and charging status. The power port controller adjusts the indicator light's operation (on/off/brightness) based on real-time detection of adapter connection and IHS charging state, providing accurate status information without requiring multiple separate LEDs.
Solution Approach 2:
The system implements feedback control where the power port controller continuously monitors the charging state and adapter connection status, then uses this information to control the indicator light's behavior. This closed-loop feedback ensures the indicator accurately reflects the current system state, resolving the ambiguity of continuous illumination.
2Reliability
If multiple indicator lights are used to show different statuses, then charging confirmation is clear, but device complexity increases
Solution Approach 1:
A single indicator light performs multiple functions by operating in different modes controlled by the power port controller. The same LED indicates both power availability and charging status through variations in illumination state (on/off/brightness), eliminating the need for separate indicator lights for each status while maintaining clear information communication.
Solution Approach 2:
The indicator light's operational parameters (illumination state, brightness level) are changed based on the detected charging status. The power port controller modifies these parameters dynamically to convey different information states, allowing one physical component to provide multiple status indications through parameter variation rather than requiring multiple physical indicators.
3Measurement precision
If AC adapter attributes are reported through a data channel, then charging state can be determined accurately, but the DC cord must support additional data communication capability
Solution Approach 1:
The DC cord's data channel, originally designed for basic communication, is utilized for additional attribute reporting functions. The same data communication infrastructure supports both standard device identification and the new AC adapter attribute reporting, allowing accurate charging state detection without adding separate dedicated communication channels or increasing physical cord complexity.
Data Source
AI summary
Systems and components are provided for charging an Information Handling System (IHS). Systems include an AC adapter configured to report attributes of the adapter. The adapter includes a DC cord that supports a data channel. The DC plug includes a circuit for operating an indicator light based on an control signal. The system includes a power port controller that receives the reported adapter attributes, determines a charging state of the IHS; generates the control signal based on the determined charging state; and transmits the control signal to the indictor light circuit via the data channel. The indicator control signal may be used to operate indicator lights on both ends of a reversible DC cord. The indicator control signal may specify a color or brightness of the indicator and may indicate a charging state of the IHS.