Power Line Modem Noise Mitigation via SMPS Switching Control
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Solution Overview
Problem
Power line communication systems face interference and signal degradation due to environmental electrical noise from switched-mode power supplies, which reduces signal-to-noise ratio and available bandwidth.
Innovation Solution
Modifying the switching behavior of switched-mode power supplies by detecting incoming transmissions and reducing interference through methods such as suspending frequency fluctuation, reducing DC power output, and synchronizing transmission frequencies to minimize harmonic interference, allowing for higher SNR and bandwidth in power line communications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If switched-mode power supply operates at high power output, then power delivery capability is improved, but electrical interference and noise on power line increases
Solution Approach 1:
The power supply operates in periodic cycles, alternating between high-power transmission mode and low-power/standby mode. This periodic operation allows the system to deliver high power when needed while reducing interference during low-power phases, resolving the contradiction between power output and electrical interference.
Solution Approach 2:
The power supply dynamically adjusts its operating state based on communication detection. When communication signals are detected on the power line, the power supply automatically transitions to a low-interference mode. This dynamic adaptation allows the system to optimize both power delivery and interference reduction in real-time.
2Object-generated harmful factors
If frequency fluctuation is applied to reduce peak harmonic energy, then harmonic distortion is reduced, but available bandwidth for communication decreases
Solution Approach 1:
The frequency fluctuation is dynamically controlled based on communication activity. During communication periods, the power supply maintains a stable frequency to preserve bandwidth. During non-communication periods, frequency fluctuation is applied to reduce peak harmonic energy. This dynamic switching resolves the contradiction between harmonic distortion reduction and bandwidth preservation.
3Reliability
If switching behavior is modified to reduce interference during incoming transmission, then signal-to-noise ratio is improved, but power delivery efficiency decreases
Solution Approach 1:
The power supply uses periodic duty cycling where high-power transmission occurs during non-communication intervals and low-interference operation occurs during communication intervals. This periodic alternation allows the system to maintain both high power delivery efficiency and high signal-to-noise ratio at different times, resolving the contradiction between these two parameters.
Data Source
AI summary
In accordance with an embodiment, a method of operating an electronic system includes detecting an incoming transmission on a power line, and modifying a switching behavior of a switched-mode power supply coupled to the power line upon detecting the incoming transmission. Modifying reduces the level of interference produced by the switched-mode power supply.