Power Line Communication Modulation Using Half-Cycle Mean Value
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Solution Overview
Problem
Current power line communication systems using 230V are prone to interference and require complex appliances, with existing methods being insufficiently resistant to noise and needing specific line wire properties, and existing solutions like amplitude modulation are not robust against perturbations in the supply network.
Innovation Solution
A demodulation circuit with an integration segment is designed to modulate and demodulate the mean value of the half cycle of the supply voltage, using a block with a power control unit and appliance, where the demodulator uses the positive half cycle as an information carrier and the negative half cycle as a reference, and the frequency of the line voltage for synchronization, reducing noise vulnerability by modifying the form of the supply voltage curve.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If amplitude modulation of supply voltage is used for power line communication, then signal transmission is achieved, but the system becomes sensitive to noise and requires complex appliances
Solution Approach 1:
The patent changes the modulation parameter from amplitude to mean value of half cycle. The modulator influences the mean value by changing the form of the supply voltage curve rather than the amplitude, making the system less sensitive to noise while simplifying the demodulation circuit to basic integration without requiring complex peak detection or amplitude measurement circuits
Solution Approach 2:
The patent extracts the demodulation function to a simple integration segment that only needs to integrate the voltage over the half cycle period. This separates the complex amplitude modulation/demodulation requirements from the actual implementation, allowing the use of simple integrators instead of complex synchronous detection circuits
2Reliability
If amplitude modulation is used to transmit signals in 230V power line, then communication is enabled, but the system requires specific line wire properties and is insufficient against interference
Solution Approach 1:
The patent changes the modulation approach from amplitude modulation to mean value modulation of half cycle. By integrating the voltage over the half cycle period, the system becomes insensitive to amplitude variations and noise, allowing communication over standard power lines without requiring specific wire properties or impedance matching
Solution Approach 2:
The integration segment acts as an intermediary that transforms the noisy voltage signal into a reliable mean value representation. The capacitor in the integrator smooths out high-frequency noise and interference, providing a clean integrated value that accurately represents the modulated information
3Measurement precision
If peak value detection is used for demodulation, then amplitude modulation is detected, but the circuit becomes complex and noise-sensitive
Solution Approach 1:
The patent replaces the mechanical/electronic peak detection system with a mathematical integration operation. Instead of using diodes, capacitors, and resistors to track peak values, the system uses an integrator that accumulates the voltage over time, providing accurate mean value detection with a simple RC circuit or digital accumulator
Solution Approach 2:
Instead of detecting the peak value and deriving the mean value from it (the conventional approach), the patent directly integrates the voltage to obtain the mean value. This inverted approach simplifies the circuit topology and improves noise immunity by averaging out fluctuations rather than tracking extremes
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables secure, reliable communication suitable for industrial use, resistant to common power supply line perturbations, allowing for reliable transmission and decoding of control signals without the need for additional power lines.
Implementation Method 1
Integration capacitor is charged through resistor during half cycle of supply voltage
Implementation Method 2
The size of mean value of half cycle is proportional to charge on the capacitor. As C (capacity) is constant, then the voltage equals to integral of current
Data Source
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AI summary
Connection for realization of the way of communication in the power line 230V by means of modulation and demodulation of mean value of half cycle of supply voltage enables reliable transmission of control signals and subsequently their decoding. Signals modulated in this way are resistant against perturbing influences that are commonly present in a supply line.