Single Filter Power Line Communication Apparatus
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Solution Overview
Problem
Existing power line communication systems require separate filters for the power supply circuit and electrical equipment, leading to inefficiencies and duplication of filtering components.
Innovation Solution
A power line communication apparatus and connecting device that utilize a single filter with impedance characteristics where the impedance at communication frequencies is higher than at power frequencies, allowing the filter to serve both power supply and electrical equipment filtering functions, eliminating the need for separate filters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate filters are provided for power supply circuit and electrical equipment, then filtering function is ensured, but device complexity and component duplication increase
Solution Approach 1:
The patent applies the universality principle by designing a single filter that performs multiple functions: it filters noise for the power supply circuit while simultaneously filtering noise for electrical equipment connected to the second connector. This multi-functional filter eliminates the need for separate filters, reducing device complexity and component duplication while ensuring comprehensive filtering protection.
2Device complexity
If a single filter is used for both power supply and electrical equipment, then device complexity is reduced, but filtering performance may be compromised
Solution Approach 1:
The patent applies the local quality principle by configuring the single filter with different impedance characteristics for different frequency ranges. The filter has high impedance at communication frequencies (first frequency) to block communication noise, and low impedance at power frequencies (second frequency) to allow power transmission. This frequency-selective impedance configuration ensures that the single filter can provide appropriate filtering performance for both power supply and electrical equipment without compromising overall filtering effectiveness.
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 configuration enables efficient use of filters, preventing duplication and ensuring effective noise suppression for both power supply and communication signals, thereby enhancing communication performance without additional filtering components.
Implementation Method 1
a single filter that has impedance characteristics in which impedance corresponding to a first frequency is higher than impedance corresponding to a second frequency
Data Source
AI summary
A cable connecting device for power line communication includes: a first wiring line 231 and a second wiring line 232 through which AC power is capable of being supplied; a power plug 120 which is electrically connected to the first wiring line 231 and the second wiring line 232 and whose wiring lines are capable of being supplied with AC power; an Ethernet port 110 through which a communication signal is capable of being input and output; a power line communication modem 220 that is connected to the Ethernet port 110 and that is connected to the second wiring line 232 through which a communication signal is transmitted by using AC power input to the power plug 120 through the first wiring line 231 between the power plug 120 and the Ethernet port 110; a filter 210 disposed on the first wiring line 231 and having high impedance in at least a frequency band used for power line communication rather than a frequency band used for AC power; and connectors 101 to 104 which axe electrically connected to the first wiring line 231 between the filter 210 and the power line communication modem 220 and to which AC power from the first wiring line 231 is capable of being supplied.