Preventing False Voltage Detection in HDMI-Connected Devices
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Summary
Problems
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 operation.
Innovation solutions
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.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
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
Why choose this principle:
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
Principle concept:
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
Why choose this principle:
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
Application Domain
Data Source
AI summary:
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.
Abstract
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.