HDMI Signal Wire Detection Circuit to Prevent False Voltage Sensing
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Solution Overview
Problem
Electronic devices connected via HDMI cables often experience malfunctions due to signal wire connections, where power is inadvertently transmitted between signal wires, leading to false detection of operating voltages and improper device operation.
Innovation Solution
Incorporating specific resistance values and rectifying elements in the signal wire connection section of the electronic device, such as pull-up resistors and diodes or transistors, to ensure that the output voltage from one signal wire is lower than the reference value when power is input, preventing false detection of operating voltages and reducing malfunctions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If signal wires are connected to perform power supply processes, then power can be transmitted between devices, but voltage may be transmitted to wrong signal wires causing malfunction
Solution Approach 1:
A detection circuit is introduced as an intermediary between the signal wires and the power supply system. This detection circuit monitors the voltage on each signal wire and determines whether to enable power supply based on the detected voltage levels, preventing direct connection issues from causing malfunctions
Solution Approach 2:
The detection circuit continuously monitors the voltage status of signal wires and provides feedback to the power supply control logic. Based on this feedback, the system dynamically adjusts power supply enablement, ensuring that power is only supplied when voltage conditions indicate proper connection status
2Ease of operation
If voltage is transmitted through connected signal wires, then power supply function is enabled, but false voltage detection occurs when devices are not operating
Solution Approach 1:
The detection circuit performs preliminary voltage detection on signal wires before enabling power supply. By checking voltage levels in advance and determining connection status beforehand, the system avoids false detection during non-operating states and ensures accurate power supply control
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 configuration effectively reduces false detection of operating voltages, ensuring accurate power status detection and normal operation of the electronic device, even when connected incorrectly, by maintaining proper signal transmission and reception through HDMI cables.
Implementation Method 1
a first resistor disposed between the first connecting wire and a power source of the electronic device; wherein a resistance value of the first resistor is set such that an output voltage from the second connecting wire is lower than a reference value
Data Source
AI summary
An electronic device includes first and second connecting wires to which first and second signal wires are connectable, respectively, and a first resistor. The first signal wire transmits a first signal between the electronic device and an external device. The second signal wire transmits a second signal from the external device to the electronic device. The first resistor is disposed between the first connecting wire and a power source of the electronic device. A resistance value of the first resistor is set such that an output voltage from the second connecting wire is lower than a reference value when a voltage of the power source is input to the second connecting wire via the first connecting wire and the external device in a state in which the first and second signal wires are electrically connected to one another and the second signal is not input to the second signal wire.