Vehicle Antenna Detection Circuit With Two-Stage Hysteresis Sensing
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Solution Overview
Problem
Existing antenna detection methods fail to accurately determine the in-position status of antennas, leading to inaccurate vehicle positioning.
Innovation Solution
An antenna detection circuit with a controller, switch circuit, and in-position detection circuit that performs two-stage comparison and amplification on the coupling point voltage, using operational amplifiers to determine the antenna's position status, incorporating hysteresis comparison to improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single threshold comparison method is used for antenna detection, then the device complexity is low, but the measurement precision of antenna position status is insufficient
Solution Approach 1:
The detection circuit is divided into two stages: a first-stage operational amplifier circuit for initial comparison and amplification, and a second-stage operational amplifier circuit for final determination. This segmentation allows each stage to perform a specific function, improving overall detection accuracy while keeping individual stages relatively simple.
Solution Approach 2:
The patent transitions from a single-threshold comparison (one-dimensional) to a two-stage comparison with different thresholds (multi-dimensional). The first stage uses a first threshold for initial detection, and the second stage uses a second threshold for confirmation, adding a temporal and functional dimension to the detection process.
2Reliability
If a single threshold comparison is performed, then the ease of operation is high, but the reliability of detection results is low due to incorrect determinations
Solution Approach 1:
The first-stage operational amplifier circuit performs preliminary comparison and amplification of the coupling point voltage against a first threshold before the final determination is made in the second stage. This preliminary action filters out obvious cases and prepares the signal for the final decision, improving reliability while maintaining operational simplicity.
Solution Approach 2:
The two-stage comparison mechanism provides implicit feedback: the output of the first stage becomes the input for the second stage, allowing the system to refine its determination through sequential evaluation rather than relying on a single potentially erroneous comparison.
3Measurement precision
If hysteresis comparison is implemented through two-stage amplification, then the measurement precision is improved, but the device complexity increases
Solution Approach 1:
The hysteresis comparison function is segmented across two operational amplifier stages, with each stage handling a portion of the comparison and amplification task. This distributes the complexity across multiple simpler components rather than requiring a single complex circuit.
Solution Approach 2:
The operational amplifiers serve multiple functions: voltage amplification, threshold comparison, and hysteresis effect generation. By making these components multi-functional, the patent reduces the need for separate dedicated circuits for each function, thereby managing overall device complexity while achieving precise measurement.
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AI summary
An antenna detection circuit and method, an in-vehicle device, and a vehicle are provided, relate to the field of communication technologies, and are used to improve antenna detection accuracy and device safety. The antenna detection circuit includes a controller (10), a switch circuit (20), and an in-position detection circuit (30), an output end of the controller (10) is coupled to a control end of the switch circuit (20), an input end of the switch circuit (20) is configured to be coupled to a power supply, an output end of the switch circuit (20) is coupled to a first input end of the in-position detection circuit (30), and a second input end of the in-position detection circuit (30) is configured to be coupled to an antenna. The controller (10) is configured to control the switch circuit (20) to be turned on or turned off. The switch circuit (20) is configured to turn on or turn off a power supply voltage for supplying power to the in-position detection circuit (30). The in-position detection circuit (30) is configured to: receive the power supply voltage, detect a coupling point voltage of the antenna, and perform two-stage comparison and amplification on the coupling point voltage based on the power supply voltage, to output a first indication signal, where the first indication signal indicates whether the antenna is in position.