LIN Bus Module for 24V Power Supply Adaptation
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Solution Overview
Problem
Standard LIN nodes are not suitable for applications with non-standard 24-volt power supplies, such as trucks and buses, due to limitations in supply voltage, leading to reduced communication speed and increased electromagnetic interference.
Innovation Solution
A network node design that includes a measurement circuit to derive the LIN standard-compliant supply voltage from the data signal, eliminating the need for an additional supply line and allowing operation with a 24-volt power supply by using a comparator and scaling circuit to generate a reference voltage and control pull-up current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If standard LIN nodes are used with 24-volt power supplies, then the nodes can operate in truck and bus applications, but communication speed reduces and electromagnetic interference increases
Solution Approach 1:
The patent segments the power supply function by introducing a voltage conversion module that separates the 24V external power supply from the internal circuit requirements. This allows the LIN node to interface with 24V systems while maintaining standard operating voltages internally, thus preserving communication quality while gaining voltage compatibility.
Solution Approach 2:
The patent introduces an intermediary voltage conversion module between the 24V power supply and the LIN node circuits. This intermediary component converts the non-standard 24V voltage to standard LIN voltage levels, enabling compatibility with truck and bus applications without degrading communication performance.
2Adaptability or versatility
If additional supply lines are added to enable 24-volt operation, then voltage compatibility is achieved, but device complexity and wiring requirements increase
Solution Approach 1:
The patent implements a universal voltage conversion module that can handle both standard and non-standard voltage inputs through a single interface. This multi-functional approach allows the same hardware design to operate with different voltage supplies without requiring additional wiring or complex switching mechanisms.
Solution Approach 2:
The voltage conversion module automatically detects and adapts to the input voltage level without requiring external control or additional wiring. The module self-regulates the voltage conversion process, eliminating the need for complex wiring arrangements or manual configuration.
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 LIN standard-compliant operation with 24-volt power supplies, reducing electromagnetic interference and maintaining communication speed while avoiding the need for additional wiring.
Implementation Method 1
a measurement circuit (3) that receives the data signal and is configured to provide a measured voltage signal (VSTORE) that represents the high signal level of the data signal (VBUS)
Implementation Method 2
a receiver circuit that employs a comparator to compare the data signal with a reference signal. The comparator generates a binary output signal representing the result of the comparison.
Implementation Method 3
A scaling circuit is provided to generate the reference signal from the first voltage signal.
Implementation Method 4
A pull-up circuit is coupled to the data line and provides a controllable load current at the bus terminal. The controllable load current passes through the pull-up circuit when the data line is pulled to a low level
Data Source
AI summary
One aspect of the invention relates to a network node for connecting to a Local Interconnect Network (LIN). In accordance with one example of the present invention, the network node includes a bus terminal which is operably coupled to a data line for receiving a data signal, which represents serial data, via that data line. The data signal is a binary signal having high and low signal levels. The network node further includes a receiver circuit which employs a comparator to compare the data signal with a reference signal. The comparator generates a binary output signal representing the result of the comparison. The network node also includes a measurement circuit that receives the data signal and provides a first voltage signal such that it represents the high signal level of the data signal.