Reversible Power Cable LED Control for Energy Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing detachable power cables for information handling systems face challenges in meeting energy efficiency standards due to the simultaneous activation of LEDs at both ends, which increases power consumption and fails to comply with no-load conditions set by regulations like the US Department of Energy and European Union Code of Conduct.
Innovation Solution
The method involves detecting connections to a power source and sink, triggering pulses on configuration channel signals to control LEDs, ensuring only the sink-side LED is activated when connected to a power source, and modifying the driver path to use the power bus signal, thereby reducing power consumption and adhering to regulatory standards.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by stationary object
If LEDs at both ends of the power cable are simultaneously activated, then the user can see connection status at both ends, but power consumption increases and regulatory standards are not met
Solution Approach 1:
The patent applies local quality by making different parts of the system (LEDs at each end) have different operational characteristics. Specifically, the sink-side LED is activated to indicate connection status while the source-side LED is deactivated, creating an asymmetric behavior that reduces overall power consumption while still providing necessary status indication at the critical location (sink side).
Solution Approach 2:
The patent inverts the conventional approach by deactivating the source-side LED and activating only the sink-side LED, rather than activating both LEDs symmetrically. This inversion of the expected behavior (where both ends would normally indicate status) achieves the dual goal of power savings and status indication by placing the indication function only where it is most needed (at the sink side).
2Ease of operation
If the LED control system uses separate driver paths for each LED, then each LED can be independently controlled, but the device complexity increases
Solution Approach 1:
The patent applies universality by making the configuration channel signals serve multiple functions: they control the LED driver paths and also carry communication protocols. This multi-functionality allows the same signal paths to be used for both LED control and data communication, reducing the need for separate dedicated control lines and thereby reducing device complexity while maintaining independent LED control capability.
Solution Approach 2:
The patent merges the LED control function with the existing communication protocol signals. By using the configuration channel signals (which already exist for communication purposes) to also control the LED driver paths, the patent combines multiple functions into existing infrastructure, avoiding the need for additional separate control circuits and reducing overall system complexity.
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
This approach reduces power consumption by only activating the sink-side LED when connected to a power source, allowing the system to meet applicable no-load conditions and energy efficiency standards, while maintaining normal power delivery communications.
Implementation Method 1
triggering, at the power source, a first pulse on a first wire of the reversable power cable that turns off a first LED switch coupled to a first LED on the first connector
Data Source
AI summary
A disclosed method for LED control for a detachable reversable power cable includes detecting, at a power source, that a first connector at a first end of the power cable is connected to the power source, triggering, at the power source, a first pulse on a first wire of the power cable that turns off a first LED switch coupled to a first LED on the first connector, disabling the first LED, and triggering, at the power source, a second pulse on a second wire of the power cable that drives a second LED on a second connector at a second end of the power cable opposite the first end, the second LED being coupled to a second LED switch that is on. The method further includes, responsive to detecting that the second connector is connected to a power sink, modifying a driver path for the second LED.