Differential Receiver Compensation for Common-Mode Noise Attenuation
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Solution Overview
Problem
In electric vehicles and hybrid electric vehicles, differential communication between voltage measurement devices is prone to failure due to common mode noise, especially when using cascode-coupled current input stages, leading to signal attenuation and incorrect current direction, which affects the reliability of battery cell voltage measurement.
Innovation Solution
A communication circuit with a receiver circuit that employs two transmission paths with opposite phase signals and compensation circuits to detect and compensate for current attenuation caused by common mode noise, ensuring adequate signal levels by adding detected attenuation currents to each signal path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If differential communication is used between voltage measurement devices, then data transmission rate is improved, but communication reliability deteriorates due to common mode noise causing signal attenuation and incorrect current direction
Solution Approach 1:
The patent implements feedback mechanisms where the receiver detects signal attenuation caused by common mode noise and sends feedback information to the transmitter. The transmitter then adjusts its transmission parameters based on this feedback to compensate for the attenuation, thereby maintaining communication reliability while using differential communication for high data transmission rates.
Solution Approach 2:
The patent dynamically changes transmission parameters such as current amplitude and voltage levels based on detected common mode noise conditions. When common mode noise is detected, the system adjusts the transmission parameters to compensate for signal attenuation, ensuring reliable communication while maintaining the benefits of differential signaling.
2Device complexity
If cascode-coupled current input stages are used in differential communication, then input impedance is improved, but signal attenuation increases due to common mode noise
Solution Approach 1:
The patent introduces intermediary compensation circuits between the cascode-coupled current input stages and the signal source. These intermediary circuits detect the signal attenuation caused by common mode noise and provide compensating signals, allowing the cascode structure to maintain its high input impedance benefit while mitigating its susceptibility to common mode noise.
Solution Approach 2:
The patent converts the harmful effect of common mode noise into a detectable parameter that triggers compensation mechanisms. By detecting the attenuation pattern caused by common mode noise, the system adjusts its operation to compensate for the effect, thereby transforming the harmful noise interaction into a controllable parameter that can be corrected.
3Reliability
If common mode noise is present in differential communication, then signal integrity deteriorates, but adding compensation circuits increases device complexity
Solution Approach 1:
The patent segments the communication system into distinct functional blocks: differential signaling stage, common mode noise detection stage, and compensation stage. Each segment handles a specific aspect of the problem, allowing the system to maintain signal integrity through targeted compensation while keeping the overall device complexity manageable through modular design.
Data Source
AI summary
A communication circuit, includes a receiver that provides communication by using a first transmission path and a second transmission path, the first transmission path being used to transmit a first signal, and the second transmission path being used to transmit a second signal; wherein the receiver includes a compensation circuit that compensates for an attenuation of a current when noise is superimposed on the first signal and on the second signal; wherein the compensation circuit includes a first compensation circuit; and wherein the first compensation circuit detects an electric current attenuation of the first signal when the noise is superimposed on the first signal, and compensates for the attenuation of the first signal by adding the detected electric current attenuation to the second signal.