Power Line Communication Signal Detector Circuit
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Solution Overview
Problem
Conventional power line communication systems are not suitable for driving large arrays of devices at high data rates due to transient signals in the supply voltage that can interfere with operation.
Innovation Solution
A signal detector circuit that includes an averaging circuit, a comparator, a sampling circuit, and a decoder circuit, along with a regulator circuit, to detect and decode data encoded in a power line communication signal, generating a stable supply voltage and driver control signals for LED zones in a display device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional power line communication systems are used to drive large arrays of devices at high data rates, then data transmission capability is improved, but transient signals in the supply voltage interfere with operation and reduce reliability
Solution Approach 1:
The signal detector circuit is divided into distinct functional modules: averaging circuit for filtering transient signals, comparator for signal detection, sampling circuit for data extraction, and decoder circuit for data interpretation. This segmentation allows each module to perform its specific function optimally, enabling reliable high-rate data transmission by separating the power supply function from the data communication function.
Solution Approach 2:
The averaging circuit acts as an intermediary between the power line communication signal and the comparator, filtering out transient voltage fluctuations before they reach the signal detection stage. This intermediary component enables the system to maintain both high data rates and operational stability by mediating between the noisy power line and the sensitive detection circuitry.
2Device complexity
If power line communication signal is used to supply both power and data, then the number of lines and pins is reduced, but transient signals in supply voltage interfere with device operation
Solution Approach 1:
The signal detector circuit extracts the data component from the power line communication signal by comparing it to the averaged supply voltage. This extraction process separates the data information from the power supply function, allowing the system to use a single line for both purposes while preventing transient voltage fluctuations from interfering with data detection.
Solution Approach 2:
The system changes the parameter of voltage comparison by dynamically adapting the reference voltage (averaged signal) to match the actual supply voltage conditions. This parameter adaptation allows the comparator to detect data signals accurately even when the supply voltage experiences transient fluctuations, enabling single-line operation without interference.
3Reliability
If averaging circuit is used to filter transient signals, then operation stability is improved, but signal processing time increases
Solution Approach 1:
The averaging circuit performs partial averaging by filtering only the transient high-frequency components of the power line communication signal while preserving the data-carrying variations. This partial action approach maintains operation stability through filtering while minimizing signal processing time by not over-filtering the useful data signals.
Solution Approach 2:
The sampling circuit employs periodic sampling at optimized intervals to extract data from the power line communication signal. This periodic action allows the system to achieve stable operation through regular signal assessment while minimizing processing time by sampling only at critical moments rather than continuously processing the entire signal.
Data Source
AI summary
Embodiments relate to a signal detector circuit suitable for a display device that detects and decodes a power line communication signal. The signal detector circuit includes an averaging circuit, a comparator, a sampling circuit, a decoder circuit, and a regulator circuit. The averaging circuit receives the power line communication signal and averages the power line communication signal over time to generate an average signal. The comparator compares the average signal to the power line communication signal and generates a comparison signal. The sampling circuit samples the comparison signal according to a sample timing of a clock signal and generates a sampled signal. The decoder circuit decodes the sampled signal and generates a decoded output signal. The regulator circuit receives the power line communication signal and generates supply voltage to power the comparator, the sampling circuit, and the decoder circuit.