CAN Bus Ringing Suppression Circuit for Stable State Transitions
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Solution Overview
Problem
Ringing oscillations on CAN bus signal lines during data transmission can negatively affect communication by causing voltage oscillations between the CANH and CANL lines, which are not effectively suppressed by existing technologies.
Innovation Solution
An electronic circuit with a transmitter and a ringing suppression circuit that detects changes in the transmitter's operating state and operates in a ringing suppression mode for a predefined time period, connecting the signal lines via an electronic switch and resistor to reduce oscillations by maintaining a low impedance between the lines during state changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data transmission is performed by frequently changing the bus state, then communication efficiency is improved, but ringing oscillations occur on the signal bus
Solution Approach 1:
The ringing suppression circuit is activated in advance before the transmitter changes its operating state. The circuit detects the intended state change and preemptively connects the signal lines through the electronic switch and resistor, establishing a low-impedance path that prevents ringing oscillations before they can occur during the actual state transition.
Solution Approach 2:
The ringing suppression circuit acts as an intermediary between the transmitter and the signal bus. It introduces an electronic switch and resistor that temporarily connect the signal lines during state transitions, providing a controlled impedance path that dampens oscillations without interfering with the normal communication function of the bus.
2Stability of the object's composition
If a ringing suppression circuit is added to suppress oscillations, then signal stability is improved, but device complexity increases
Solution Approach 1:
The ringing suppression circuit is integrated into the transmitter device itself, allowing the device to self-regulate its signal output. The circuit monitors the transmitter's own operating state changes and automatically activates suppression measures without requiring external control, thereby improving signal stability while minimizing additional complexity.
Solution Approach 2:
The ringing suppression functionality is merged with the existing transmitter structure. The electronic switch and resistor are integrated into the transmitter's output stage, and the detection of operating state changes utilizes the same signal paths already present in the transmitter, reducing the need for separate independent circuits and minimizing overall device complexity.
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
The solution effectively suppresses or reduces ringing oscillations on the signal bus, improving communication reliability by maintaining a stable bus voltage during state transitions, thus enhancing data transmission quality.
Implementation Method 1
connecting the signal lines via an electronic switch and resistor to reduce oscillations by maintaining a low impedance between the lines during state changes
Data Source
AI summary
An electronic circuit includes a transmitter with a first output configured to be connected to a first signal line of a signal bus, a second output configured to be connected to a second signal line of a signal bus, and an input configured to receive an input signal; and a ringing suppression circuit with a third output configured to be connected to the first signal line, and a fourth output configured to be connected to the second signal line. The transmitter is configured to operate in one of a first operating state or a second operating state dependent on the input signal. The ringing suppression circuit is configured to detect a change from the first operating state to the second operating state of the transmitter, and to operate in a ringing suppression mode for a predefined time period in response to detecting the change.