PWM Signal Read-Back for Reliable Value Transmission
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Solution Overview
Problem
Existing pulse-width-modulated signal transmission systems are prone to errors due to disturbances, leading to incorrect value or range derivation at the receiver, which can result in erroneous data processing and transmission.
Innovation Solution
A system comprising a transmitter and receiver interconnected via a signal line and ground line, where the transmitter detects and outputs pulse-width-modulated signals, reads back the signal to check for errors, and generates an error signal if the value or range cannot be derived, modifying the signal to ensure reliable reception by the receiver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pulse-width-modulated signals are transmitted without read-back verification, then transmission speed is maintained, but transmission reliability deteriorates due to undetected disturbances
Solution Approach 1:
The transmitter reads back the emitted pulse-width-modulated signal from the signal line to verify transmission integrity. This feedback mechanism allows detection of disturbances that occurred during transmission, enabling the system to identify and reject erroneous values while maintaining reliable operation.
2Reliability
If the transmitter reads back and verifies the emitted signal, then transmission reliability improves, but processing time increases
Solution Approach 1:
The transmitter performs read-back verification of the emitted signal before the receiver processes the value. By checking for disturbances and errors in advance, the system prevents erroneous data from being forwarded, saving time that would otherwise be spent processing incorrect information.
3Measurement precision
If error signals are implemented to reject invalid values, then data accuracy improves, but device complexity increases
Solution Approach 1:
The system uses pulse width as a parameter to encode error information. Error signals are represented as pulse-width-modulated signals with pulse widths outside the valid range (e.g., <10% or >90% of transmission sequence duration), allowing the receiver to distinguish errors from valid data through simple parameter comparison without complex error handling logic.
Data Source
AI summary
A system for transmitting a value via a pulse-width-modulated signal, comprises a transmitter and a receiver. The transmitter is configured for detecting the value and for outputting a pulse-width-modulated signal having a pulse width which represents the value or a range around the value. The receiver is configured for deriving the value or the range from the pulse-width-modulated signal, by evaluating the pulse width. The transmitter is furthermore configured to read back the emitted pulse-width-modulated signal and to check whether the value or the range can be derived from the emitted pulse-width-modulated signal, and, if the value or the range cannot be derived, to output an error signal to the receiver.