Vehicle Camera Noise Filtering Circuitry for Power-Over-Coax Links
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Solution Overview
Problem
Existing vehicle imaging systems suffer from noise interference in power and data transmission due to the lack of effective noise filters in the DC/DC power supply, leading to degraded signal-to-noise ratio and reduced transmission distance.
Innovation Solution
Incorporating a noise filter, comprising passive components like inductors, capacitors, and ferrets, in the power line of the DC/DC converter to reduce noise in the signal transmission between the camera and the vehicle's electronic control unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If power is transmitted through the same line as data (Power over Ethernet/LVDS), then energy efficiency is improved, but electromagnetic noise interference increases
Solution Approach 1:
The patent divides the transmission line into separate functional segments: a power transmission path and a data transmission path. By using separate physical pathways for power and data, the electromagnetic interference between them is eliminated while maintaining energy efficiency through dedicated power delivery infrastructure.
Solution Approach 2:
The patent introduces shielding structures and filtering components as intermediary elements between the power and data transmission paths. These intermediaries act as barriers that block electromagnetic noise from the power line from interfering with the data signals, allowing both functions to coexist on the same cable assembly.
2Adaptability or versatility
If transmission distance is increased, then system versatility is improved, but signal-to-noise ratio deteriorates
Solution Approach 1:
The patent moves the data transmission from electrical signals through the power cable to optical signals through a separate optical fiber or shielded pathway. This dimensional change in the transmission medium allows for extended transmission distances while maintaining signal integrity and high signal-to-noise ratios through the inherent immunity of optical transmission to electromagnetic interference.
Solution Approach 2:
The patent employs shielding layers and filtering circuits as intermediary components along the transmission path. These intermediaries actively suppress electromagnetic noise and maintain signal quality over extended distances, enabling versatile system deployment without compromising measurement precision or signal integrity.
3Measurement precision
If noise filtering is added to the DC/DC converter, then signal-to-noise ratio is improved, but device complexity increases
Solution Approach 1:
The patent integrates the noise filtering functionality directly into the existing DC/DC converter architecture by combining filter components with the power conversion circuitry. This merging approach achieves effective noise reduction without adding separate filtering modules, thereby improving signal-to-noise ratio while minimizing increases in device complexity.
Solution Approach 2:
The patent designs the DC/DC converter to perform multiple functions simultaneously: power conversion, noise filtering, and electromagnetic shielding. By making the converter a multi-functional component, the system achieves improved signal-to-noise ratio without proportionally increasing overall device complexity, as the same structural elements serve multiple purposes.
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
Enhances the signal-to-noise ratio, increases transmission distance, and allows for lower energy consumption while improving electromagnetic compatibility emissions.
Implementation Method 1
the transmission line having a noise filter that filters noise from the signal or signals (such as a power signal) carried or communicated or transmitted by the transmission line
Data Source
AI summary
A vehicular vision system includes a camera disposed at a vehicle and an electronic control unit (ECU) disposed at the vehicle remote from the camera. The ECU links to a vehicle network bus of the vehicle. The camera is connected to the ECU via an image data transmission line, which includes (i) a power-over-coaxial image data transmission line or (ii) a power-over-ethernet image data transmission line. The image data transmission line (i) transmits image data captured by the camera to the ECU and (ii) delivers electrical power from the ECU to the camera and (iii) communicates a control signal from the ECU to the camera. Captured image data is processed at the ECU for at least one driver assistance system of the vehicle. Filtering circuitry that filters electrical noise arising at least from delivery of electrical power via the image data transmission line from the ECU to the vehicular camera.