Load Driving Device Abnormality Detection via Timer Circuit
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Load driving devices face challenges in determining abnormality in control data during high-speed serial communication, making it difficult to prevent continued output abnormalities when errors occur.
Innovation Solution
A load driving device with a converter and timer circuit that performs parallel conversion of control data and measures duration time to transition states, forcing the output circuit to change states when abnormality determination time is reached, preventing prolonged abnormality in output states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If parity check or sum check is performed by software to determine abnormality in control data, then measurement precision of data validation is improved, but productivity is worsened due to long processing time during high-speed communication cycles
Solution Approach 1:
The patent replaces software-based parity check or sum check with a hardware timer circuit that automatically measures the duration time of the output state. This substitution eliminates the need for complex software calculations during high-speed communication, achieving both fast processing and reliable abnormality detection without compromising communication speed.
2Measurement precision
If error check bit is added to data frame to detect abnormality, then measurement precision of data validation is improved, but device complexity is worsened due to additional hardware components
Solution Approach 1:
The patent extracts the abnormality detection function from the data frame structure itself and implements it through a separate timer circuit that measures duration time. This approach avoids adding error check bits to the communication data, maintaining simple hardware structure while achieving reliable validation through time-based measurement.
Solution Approach 2:
The timer circuit acts as an intermediary between the output circuit and the control data, measuring the duration time of the output state to detect abnormalities. This intermediary approach avoids direct modification of the data frame structure, maintaining simplicity while enabling effective abnormality detection.
3Reliability
If output state is forced to transition to prevent continued abnormality, then reliability is improved, but device complexity is worsened due to additional control logic
Solution Approach 1:
The timer circuit automatically measures the duration time of the output state and triggers a forced transition when abnormality is detected, without requiring external intervention or complex control logic. The system serves itself by using the timer's inherent timing capability to detect and correct abnormalities, improving reliability while maintaining simple control structure.
Data Source
AI summary
A load driving device including a converter, an output circuit and a timer circuit is provided. The converter receives a communication frame including a data signal through a serial communication and performs parallel conversion on the data signal to output an instruction signal instructing the output circuit to transition to a first state when the data signal includes first serial data and output an instruction signal instructing the output circuit to transition to a second state when the data signal includes second serial data. A timer circuit measures a duration time during which the converter receives the first serial data. When the measuring duration time arrives at an abnormality determination time, the timer circuit forces the output circuit to transition to the second state when the measuring duration time arrives at an abnormality determination time.