Power Line Communication Capacitor Placement for High Frequency Interference
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Solution Overview
Problem
In power line communication systems, high frequency signals can interfere with batteries and loads, especially when large currents are supplied, leading to increased space, cost, and weight requirements for filtering elements.
Innovation Solution
A power line communication system that includes communication nodes connected by a direct current power line and a capacitor coupled between the power line and ground, positioned at specific intervals to restrict the influence of high frequency signals on batteries and loads, using a simple structure equivalent to a short stub configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a balanced filter is used to restrict high frequency signal transmission to the battery, then the high frequency signal interference is reduced, but the space, cost, and weight increase due to large current requirements
Solution Approach 1:
The patent extracts the essential function of the balanced filter by using a simple capacitor connected to ground at specific positions along the power line. This capacitor configuration alone can restrict high frequency signal transmission to the battery, eliminating the need for complex balanced filters and their associated large dimensions, high cost, and heavy weight.
Solution Approach 2:
The patent replaces expensive and bulky balanced filters with a simple, inexpensive capacitor that can be easily installed at specific positions along the power line. The capacitor serves the same protective function against high frequency interference but with minimal cost and weight penalties.
2Object-affected harmful factors
If a balanced filter is used to restrict high frequency signal transmission to the battery, then the high frequency signal interference is reduced, but the space and cost increase due to large current requirements
Solution Approach 1:
The patent extracts the essential function of the balanced filter by using a simple capacitor connected to ground at specific positions along the power line. This capacitor configuration alone can restrict high frequency signal transmission to the battery, eliminating the need for complex balanced filters and their associated large dimensions, high cost, and heavy weight.
Solution Approach 2:
The patent replaces expensive and bulky balanced filters with a simple, inexpensive capacitor that can be easily installed at specific positions along the power line. The capacitor serves the same protective function against high frequency interference but with minimal cost and weight penalties.
3Object-affected harmful factors
If a balanced filter is used to restrict high frequency signal transmission to the battery, then the high frequency signal interference is reduced, but the device complexity increases due to large current requirements
Solution Approach 1:
The patent extracts the essential function of the balanced filter by using a simple capacitor connected to ground at specific positions along the power line. This capacitor configuration alone can restrict high frequency signal transmission to the battery, eliminating the need for complex balanced filters and their associated large dimensions, high cost, and heavy weight.
Solution Approach 2:
The patent replaces expensive and bulky balanced filters with a simple, inexpensive capacitor that can be easily installed at specific positions along the power line. The capacitor serves the same protective function against high frequency interference but with minimal cost and weight penalties.
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
Effectively filters high frequency signals from reaching batteries and loads without the need for large or costly filtering elements, maintaining communication characteristics within the passband while attenuating signals outside the desired frequency range.
Implementation Method 1
a capacitor coupled between the direct current power line and a ground... The capacitor is coupled with the direct current power line at a position where a line length from the connection point is (n×λ/2+λ/4)
Data Source
AI summary
A power line communication system includes a plurality of communication nodes, a communication line coupling the communication nodes, a direct current power line coupling a connection point of the communication line with one of a positive terminal of a battery and a supply terminal of a load, and a capacitor coupled between the direct current power line and a ground. The communication nodes communicate with each other by superimposing a high frequency signal having a wavelength of λ to the communication line. The capacitor is coupled with the direct current power line at a position where a line length from the connection point is (n×λ/2+λ/4), where n is a natural number including zero.