Sink Device Standby Power Management via Connection Detection
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Solution Overview
Problem
Existing power supply systems for image reception and transmission apparatuses do not effectively manage standby power, leading to unnecessary power consumption.
Innovation Solution
A sink device with a power supply unit and detection unit that only starts power supply after detecting connection with the source device, using a configuration that includes a power supply unit, detection unit, and communication protocols like CEC and HPD to manage power delivery efficiently.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the sink device continuously supplies standby power to the source device, then the source device can maintain operation readiness, but unnecessary power consumption increases
Solution Approach 1:
The power supply system dynamically adjusts its state based on connection status. The detection unit continuously monitors whether the source device is connected, and the power supply unit accordingly switches between supplying standby power and stopping power supply. This dynamic adaptation resolves the contradiction by providing power only when needed (when connected) while avoiding unnecessary power consumption when disconnected.
Solution Approach 2:
The detection unit provides feedback information about the connection status to the power supply unit. When the detection unit detects connection, it signals the power supply unit to begin supplying standby power. When disconnected, the feedback signal stops power supply. This feedback mechanism ensures power is supplied only when the source device is actually connected, eliminating wasteful standby power consumption while maintaining operation readiness when needed.
2Speed
If the power supply unit starts power supply immediately upon connection detection, then response time is reduced, but power may be supplied when not actually needed
Solution Approach 1:
The detection unit performs preliminary detection of the source device connection status before the power supply unit activates. This preliminary action filters out false connection signals and ensures that power supply is initiated only after genuine connection is confirmed. The system waits for proper connection detection (HPD signal, CEC communication) before starting power supply, preventing premature or unnecessary power delivery while maintaining fast response to legitimate connections.
Data Source
AI summary
In a system in which an image signal is transmitted from a source device to a sink device and the sink device (or source device) supplies power to the source device (or sink device), power saving of standby power supplied by the sink device (or source device) is realized.There is a feature that a sink device or a source device detects connection with the other device, starts the supply of standby power, confirms that the standby power does not flow or confirms that message exchange with the other device is possible even if the standby power is temporarily stopped, and stops the supply of the standby power.