Automotive Data Transceiver Common-Mode Interference Compensation
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Solution Overview
Problem
The increasing number of electrical and electronic systems in automobiles, particularly with the adoption of the IEEE 1000Base-T1 standard, leads to significant electromagnetic interference (EMI) due to mutual interference, which reduces the signal-to-noise ratio and increases bit-error rates, posing a challenge in maintaining reliable data transmission within the limited automotive space.
Innovation Solution
A data transmission system with a control unit featuring a two-wire line for differential signal transmission, incorporating a measuring circuit to detect common-mode components, an error correction circuit to generate correction signals, and a compensation circuit to correct received signals, integrated into a single chip receiver, along with a common-mode filter to mitigate interference, allowing for comprehensive interference compensation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the IEEE 1000Base-T1 standard is adopted for high-bandwidth data transmission, then data transmission speed is improved, but electromagnetic interference increases
Solution Approach 1:
The patent implements a feedback mechanism where the receiver measures the common-mode component of the received signal and feeds back correction information to the transmitter. The transmitter then adjusts its transmission signal based on this feedback to compensate for EMI effects. This closed-loop feedback system enables the high-speed 1000Base-T1 transmission to maintain signal integrity despite electromagnetic interference from other automotive systems.
2Adaptability or versatility
If multiple electrical and electronic systems are placed in limited automotive space, then system functionality is improved, but electromagnetic interference increases
Solution Approach 1:
The feedback mechanism measures the actual common-mode interference present in the transmission channel and generates correction signals accordingly. This allows the system to adapt to the specific EMI environment created by multiple electronic systems in the automotive platform, maintaining reliable communication without requiring physical isolation or shielding of each system.
3Object-affected harmful factors
If complex input filters are used for common-mode suppression, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
Instead of using complex passive filters at the input, the patent employs an active feedback mechanism that digitally measures and corrects common-mode interference. This software-based correction approach replaces complex hardware filtering, reducing component count and simplifying the receiver design while maintaining effective EMI suppression.
Solution Approach 2:
The patent replaces the mechanical/electrical approach of complex input filtering with a signal processing approach. The common-mode correction is achieved through digital signal processing and mathematical compensation rather than physical filter components, substituting electronic/mechanical filtering with computational methods.
4Productivity
If the bandwidth is increased to 350-500MHz for 1000Base-T1 standard, then data transmission capacity is improved, but signal-to-noise ratio decreases
Solution Approach 1:
The feedback mechanism measures the common-mode component across the entire 350-500MHz bandwidth and generates frequency-dependent correction signals. This allows the system to maintain signal-to-noise ratio across the wide bandwidth by actively compensating for EMI effects at each frequency, enabling high-capacity data transmission without sacrificing signal quality.
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
This approach effectively reduces electromagnetic interference by correcting differential signal errors caused by common-mode components, enhancing signal integrity and reducing bit-error rates in high-bandwidth automotive data transmission systems like Ethernet, even in the presence of large interference signals from engine switching operations.
Implementation Method 1
A measuring circuit 10 is arranged upstream of the common-mode filter 4 and detects the common-mode component
Implementation Method 2
a common-mode filter (4) arranged downstream of the measuring circuit (10), configured to remove the common-mode component from the useful signal
Implementation Method 3
A useful signal is transmitted as a differential signal between the first and second control units via the two-wire line
Data Source
Figure 1
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AI summary
The invention relates to a data transfer system (1), wherein the data transfer system (1) has a first control unit (2) and a second control unit (3), wherein the transfer path between the two control signals (2, 3) is formed at least partially by a two-wire cable (5), by means of which a useful signal is transferred as a difference signal between the first control unit (2) and the second control unit (3), wherein the first control unit (2) has a transceiver (9) and the second control unit (3) has a receiver (8), wherein a measurement circuit (10) designed to measure a common-mode component in the useful signal is arranged before the receiver (8) of the second control unit (3), wherein an error correction circuit (11) is provided, which is designed in such a way that a correction signal (F) is produced in accordance with the measured common-mode component, wherein a compensation circuit (12) is arranged after the receiver (8), wherein the compensation circuit (12) is designed in such a way that the useful signal received by the receiver (8) is corrected by means of the correction signal (F). The invention further relates to a control unit and to a method for transferring data.