Asynchronous Trigger Signal Generation in Position Measuring Devices
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Solution Overview
Problem
Position measuring devices with serial interfaces lacking a clock line face challenges in generating precise trigger signals, leading to dead time and outdated measured values, especially in high-speed applications where the timing of sampled values is critical for accurate control loops.
Innovation Solution
A method and device for generating an asynchronous trigger signal in position measuring devices, which involves converting an asynchronous data stream into a synchronous data stream using a working clock signal, evaluating the synchronous data stream to determine a release condition, and generating a gate signal to output the trigger signal upon a signal edge in the asynchronous data stream, ensuring synchronization with the interface clock signal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a synchronous-serial interface with clock line is used to generate trigger signals, then timing precision is improved, but interface complexity increases due to additional clock line requirement
Solution Approach 1:
The patent introduces a synchronization unit as an intermediary component that receives the asynchronous data stream and generates a synchronous trigger signal based on it. This mediator converts the asynchronous interface into a synchronous triggering mechanism without requiring an additional clock line, thus achieving precise timing while maintaining interface simplicity.
Solution Approach 2:
The patent replaces the mechanical/clock-based synchronous interface with a software/logic-based solution. Instead of using a physical clock line to synchronize triggering, the system evaluates the asynchronous data stream itself to generate trigger signals, substituting hardware synchronization with intelligent data stream analysis.
2Device complexity
If measured values are transmitted via asynchronous serial interface without clock line, then interface simplicity is improved, but trigger signal timing precision deteriorates causing dead time
Solution Approach 1:
The patent performs preliminary evaluation of the asynchronous data stream to identify upcoming trigger events before the actual measurement data is fully processed. By analyzing the data stream in advance and generating trigger signals at the optimal moment, the system eliminates dead time while maintaining interface simplicity.
Solution Approach 2:
The system implements a feedback mechanism where the asynchronous data stream is continuously monitored and evaluated. The trigger unit uses this feedback information to dynamically adjust trigger signal generation, ensuring precise timing despite the asynchronous nature of the interface.
3Device complexity
If trigger signal generation is based on asynchronous data stream directly, then interface simplicity is maintained, but measurement accuracy deteriorates due to timing uncertainty
Solution Approach 1:
The evaluation unit acts as an intermediary between the asynchronous data stream and the trigger signal generation. It analyzes the data stream to precisely determine the timing of signal edges and generates trigger signals with accurate timing information, thereby maintaining measurement accuracy while using a simple asynchronous interface.
Data Source
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AI summary
The present invention relates to a device and a method for generating an asynchronous trigger signal (T) in a position measuring device (10) comprising a position sensing unit (20), a processing unit (30), and an interface unit (40), which can be connected to a downstream electronics unit (100) via the interface unit (40) and a bidirectional data transmission channel (41, 50, 51) for communication purposes. The device includes a trigger unit (60) to which an asynchronous data stream (A_DS) from the downstream electronics unit (100) and a synchronous data stream (S_DS), which can be generated in a synchronization unit (42) by sampling the asynchronous data stream (A_DS) at the time interval of a clock signal (CLK), are supplied.The trigger unit (60) has an evaluation unit (62) in which a release condition for the output of the trigger signal (T) can be determined by evaluating the synchronous data stream (S_DS) and a gate signal (G) can be generated, as well as a trigger signal output unit (64) to which the gate signal (G) is supplied and in which the trigger signal (T) can be generated when the gate signal (G) is present and when a signal edge of the asynchronous data stream (A_DS) occurs.