Signal Isolator Encoding for High Common-Mode Transient Immunity
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Solution Overview
Problem
Electronic devices face challenges in maintaining high common mode transient immunity (CMTI) to prevent signal transmission errors due to common-mode transient interference, particularly in applications like electric vehicles and motor driving devices where high precision is required.
Innovation Solution
An isolator with an input-side circuit and output-side circuit, featuring a signal transmission unit that generates an encoded signal by combining a pulse signal and a non-amplitude encoding signal, effectively enhancing the isolator's ability to resist noise and improve signal reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional signal transmission is used in isolators, then the device complexity is low, but the common mode transient immunity is insufficient leading to signal transmission errors
Solution Approach 1:
The signal transmission is divided into two independent portions: a first portion (pulse signal) for timing information and a second portion (non-amplitude encoding signal) for data information. This segmentation allows each portion to be optimized independently for noise resistance, thereby improving common mode transient immunity without requiring complete redesign of the entire transmission system.
Solution Approach 2:
The isolator uses periodic pulse signals with specific width and interval parameters to encode transmission information. By controlling the pulse width and interval, the system achieves noise-resistant signal transmission that maintains reliability under common mode transient interference while keeping the encoding structure manageable.
2Object-affected harmful factors
If higher CMTI value is required for high precision electronic devices, then the noise resistance improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent employs periodic pulse signals with controlled width and interval to encode transmission information. This approach achieves high noise resistance through temporal encoding rather than amplitude encoding, which simplifies manufacturing requirements while maintaining high CMTI performance suitable for precision electronic devices.
Solution Approach 2:
The system changes the encoding parameters from traditional amplitude-based encoding to pulse width and interval-based encoding. This parameter transformation enables the isolator to achieve high noise resistance and CMTI values without requiring complex manufacturing processes, as the encoding is achieved through temporal parameters rather than complex circuit structures.
Data Source
AI summary
The present invention discloses an isolator and a signal generation method. The isolator includes an input-side circuit, an output-side circuit and a signal transmission unit. The input-side circuit is configured to receive an input signal and to generate an encoding signal according to the input signal. The signal transmission unit is coupled to the input-side circuit and configured to receive and transmit the encoding signal. The output-side circuit is coupled to the signal transmission unit and configured to receive the encoding signal from the signal transmission unit. The encoding signal includes a first portion and a second portion. The first portion is a pulse signal, and the second portion is a non-amplitude encoding signal.