Asynchronous Communication Circuit Duty Ratio Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional asynchronous communication circuits face challenges in accurately receiving data at high communication speeds due to variations in rise and fall delays caused by different insulating components, leading to distorted waveforms with varying duty ratios, which restrict communication speed and accuracy.
Innovation Solution
The proposed asynchronous communication circuit includes a clock generator, start bit decision circuit, divider counter, comparator, data reception shift register, and switching circuit to adjust the data reception and transmission shift clocks based on the difference in rise and fall delays, allowing for accurate data transfer even with large variations in duty ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If data is transmitted at high communication speeds, then productivity is improved, but measurement precision deteriorates due to waveform distortion from rise and fall delays
Solution Approach 1:
The patent pre-calculates and stores the difference between rise delay and fall delay for each insulating component in a delay difference table before communication occurs. During data reception, this pre-stored delay difference information is immediately retrieved and used to adjust the sampling timing, eliminating the need for real-time delay calculation and enabling accurate data reception at high communication speeds
Solution Approach 2:
The patent dynamically adjusts the data reception sampling timing based on the duty ratio and delay characteristics of the insulating component. By changing the sampling point in response to varying duty ratios caused by different insulating components, the system maintains accurate data reception despite waveform distortion at high communication speeds
2Adaptability or versatility
If insulating components with different rise and fall delays are used, then adaptability is improved, but manufacturing precision deteriorates due to waveform distortion
Solution Approach 1:
The patent adjusts the data reception sampling timing parameter based on the specific insulating component's delay characteristics. By changing the sampling point to compensate for different rise and fall delays, the system achieves accurate data reception across various insulating components without requiring uniform waveform characteristics
Solution Approach 2:
The patent creates a delay difference table that stores the delay characteristics of different insulating components. This table serves as a reference copy that enables the system to identify and compensate for the specific delay characteristics of any insulating component used in the communication path
3Device complexity
If conventional asynchronous communication circuits are used, then device complexity is reduced, but reliability deteriorates due to inability to handle duty ratio variations
Solution Approach 1:
The patent pre-stores delay difference information in a lookup table and uses this information to adjust sampling timing, avoiding the need for complex real-time delay measurement and compensation circuits while maintaining reliable data reception under varying duty ratio conditions
Solution Approach 2:
The system automatically identifies the insulating component's delay characteristics and adjusts its own sampling timing accordingly, without requiring external calibration or complex control mechanisms, thereby maintaining reliability with minimal additional circuitry
Data Source
AI summary
A counter value of a divider counter 3 that determines a communication speed is compared by a comparator 4 with a value calculated from a difference between fall delay and rise delay, and data is received with a matching signal serving as a data reception shift clock (S201), thereby acquiring receive data on the optimum position. Further, with the data reception shift clock (S201) serving as a data transmission shift clock (S201), the transmission control circuit 5 transmits serial data (S203) from the data transmission shift register 7 as data with a duty ratio reversed from a varied duty ratio of the communication system. Thus, it is possible to transmit data with a normal duty ratio to another communication device.