Antenna Connection Detection Circuit for Vehicle Navigation
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Solution Overview
Problem
Existing vehicle navigation devices with integrated antennas face challenges in accurately detecting the connection state of antennas using low resistance values without noise interference, as large currents can lead to resistor burnout and disable optical beacon transmission.
Innovation Solution
A device that uses a pseudo up-link signal to detect the connection state by generating a large drop voltage in a resistor with a small resistance value, and adjusts the detection interval based on the connection state to prevent resistor burnout and noise interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large resistance value is set for the resistor to obtain a large drop voltage for accurate detection, then the connection state can be detected accurately, but the resistor is likely to be burned out by large current when optical beacons transmit up-link signals
Solution Approach 1:
The system performs connection state detection before optical beacon transmission. By detecting the connection state in advance using the resistor voltage drop with small resistance value, the system avoids the risk of resistor burnout during high-current transmission while still achieving accurate detection of the connection state.
Solution Approach 2:
The connection state is detected periodically at specific intervals rather than continuously during transmission. This periodic detection approach allows the system to monitor connection status at safe moments when large transmission currents are not flowing, preventing resistor damage while maintaining detection capability.
2Reliability
If a small resistance value is set for the resistor to prevent burnout during high current, then the resistor durability is improved, but the drop voltage becomes too small to detect the connection state accurately
Solution Approach 1:
Connection detection is performed in advance before optical beacon transmission begins. This timing allows the use of a small resistance value resistor that can withstand transmission currents, while still obtaining measurable voltage drops during the preliminary detection phase when currents are lower.
Solution Approach 2:
The system uses the resistor as an intermediary element with small resistance value that can handle high currents, and combines it with voltage detection circuitry that can accurately measure small voltage drops. The detection circuit acts as a mediator to extract connection state information from the small voltage signal without requiring a large resistance value.
3Productivity
If current detection is performed during optical beacon transmission, then real-time monitoring is achieved, but noise interferes with the detection and may disable optical beacon transmission
Solution Approach 1:
Connection state detection is performed periodically at specific intervals rather than continuously during transmission. This periodic approach allows the system to monitor connection status at moments when optical beacon transmission is not active, avoiding noise interference from the transmitting element while still providing timely monitoring capability.
Solution Approach 2:
The system performs connection detection in advance before optical beacon transmission begins. By detecting the connection state preliminarily when the transmitting element is not active, the system avoids noise interference during detection while still achieving real-time monitoring through periodic re-detection at appropriate intervals.
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
Enables accurate detection of antenna connection states with low resistance values, preventing resistor burnout and noise interference, while allowing the antenna to function effectively and prolonging the life of the transmitting element.
Implementation Method 1
a voltage drop occurs in a resistor. When the antenna is connected, a large current flows into the transmitting element for optical beacons. Thus, a large current flows through the resistor, a sufficiently large drop voltage is produced in the resistor
Data Source
AI summary
A current flowing from a circuit section into an integrated antenna flows through a coil. When a pseudo up-link signal is outputted from a VICS (light) signal processing circuit to check a connection state of an integrated antenna, since a large current flows through a transmitting element for optical beacons of the integrated antenna, a drop voltage of the coil becomes large. When the drop voltage of the coil is within a prescribed range because of divided voltages of resistors, the antenna detection circuit determines that the integrated antenna is normal. In this case, since a large current flows into the coil, a coil having small impedance is used.