HDMI Source Device Power Management via Cable Detection
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Solution Overview
Problem
HDMI source devices with limited power resources, such as mobile devices, face challenges in providing a constant 5V signal to connected HDMI sink devices without depleting their power resources, as they must maintain this voltage even when not connected, leading to increased power consumption and reduced performance.
Innovation Solution
A method and system for detecting HDMI cable insertion using mechanical or electrical means, enabling a charge pump to transform a lower voltage into a constant 5V signal only when a connection is detected, reducing power consumption by supplying 5V only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a constant 5V signal is provided to the HDMI interface, then the HDMI sink device can be reliably powered and connected, but the power consumption of the source device increases
Solution Approach 1:
The patent implements dynamic power management by switching the 5V power supply state based on connection detection. The system transitions from a static constant 5V output to a dynamic state where power is enabled only when an HDMI cable is detected, resolving the contradiction between maintaining reliable connection power and reducing unnecessary power consumption during idle periods
Solution Approach 2:
The system uses feedback from the connection detection mechanism to control the power supply state. When the HDMI cable insertion is detected through mechanical or electrical means, this feedback signal triggers the enabling of the 5V power output, creating a closed-loop control system that adjusts power delivery based on actual connection status
2Reliability
If the charge pump is always enabled to transform voltage to 5V, then the constant voltage requirement is met, but the operating time of mobile devices is reduced
Solution Approach 1:
The charge pump operates periodically rather than continuously - it is activated only during periods when an HDMI connection is detected and deactivated when no connection is present. This periodic operation pattern maintains the required constant 5V output during active use while significantly extending battery operating time during idle periods when the pump remains off
3Device complexity
If connection detection is not implemented, then the system structure remains simple, but power resources are wasted continuously
Solution Approach 1:
The system performs preliminary connection detection through mechanical switch or electrical continuity checking before activating the power-consuming charge pump and 5V output. This preliminary action prevents unnecessary power activation, eliminating energy waste while adding only minimal detection circuitry to the overall system
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 conserves power in devices with limited resources by dynamically providing a 5V signal only when an HDMI connection is established, reducing the burden on the transmitting device and extending its operating time.
Implementation Method 1
The insertion may be detected when the HDMI connector depresses a pressure sensitive switch
Implementation Method 2
The insertion may be detected when a change in voltage is measured by a voltage comparator
Implementation Method 3
enabling a charge pump to transform a lower voltage into a constant 5V signal
Data Source
AI summary
A device is provided for use with an audiovisual device and a cable having a first end and a second end. The audiovisual device can receive digital television audiovisual signals. The cable includes a data channel, a control channel and a power line and can transmit the digital television audiovisual signals. The first end can connect to the audiovisual device, whereas the second end can connect to the device. The device includes a connector, a detecting portion and a power source. The connector can connect to the second end. The detecting portion can generate a connection signal based on a connection of the connector to the second end. The power source can provide power based on the connection signal.