In-Vehicle Terminal Switch Circuit for Multi-Power Compatibility
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Solution Overview
Problem
In-vehicle terminals face compatibility issues due to different power supply manners, limiting their application and functionality, as existing methods often rely on a single power supply type and fail to accurately turn on/off when using USB ports with simultaneous VBUS and USB ID signals.
Innovation Solution
An in-vehicle terminal with a switch circuit comprising an output circuit, control circuit, and multiple input circuits that can receive and transmit trigger signals specific to various power supply types, such as USB ID and VBUS signals, allowing for independent control and blocking of signals to ensure accurate on/off states regardless of the power supply method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple input circuits are used to support different power supply types, then adaptability is improved, but device complexity increases
Solution Approach 1:
The power supply interface is segmented into multiple independent input circuits (first input circuit for USB ID signal, second input circuit for VBUS signal), each handling a specific power supply type. This segmentation allows the terminal to support multiple power supply types simultaneously while maintaining clear signal separation and independent control pathways.
Solution Approach 2:
A control circuit is introduced as an intermediary between the multiple input circuits and the output circuit. This control circuit receives signals from both input circuits, determines the appropriate power supply type, and selectively enables or blocks signal transmission to the output circuit. The intermediary control circuit manages the complexity by centralizing the decision-making logic.
2Reliability
If signal blocking control is implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The control circuit performs preliminary analysis of signals from both input circuits before transmitting to the output circuit. By evaluating the power supply type in advance and pre-determining which signal path should be active, the control circuit ensures reliable on/off state control while preventing signal conflicts before they occur.
Solution Approach 2:
The control circuit monitors the states of both input circuits and dynamically adjusts signal transmission based on detected power supply conditions. This feedback mechanism ensures that only the appropriate signal is transmitted to the output circuit, maintaining reliable control while adapting to different power supply scenarios.
Data Source
AI summary
The present invention provides an in-vehicle terminal and a method for turning on/off the in-vehicle terminal. The in-vehicle terminal includes a switch circuit. The switch circuit includes: an output circuit, a control circuit, a first input circuit, a second input circuit and a control circuit. The first input circuit is configured to transmit the received first trigger signal to the output circuit. The second input circuit is configured to transmit the received second trigger signal to the output circuit. The output circuit is configured to output a first control signal for turning on/off the vehicle terminal according to the first trigger signal or the second trigger signal. The control circuit is configured to block the second trigger signal from being transmitted to the output circuit when both the first input circuit and the second input circuit are transmitting a corresponding trigger signal to the output circuit.