Electrical Filter Circuit Using Impedance Paths for Ripple Attenuation
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Solution Overview
Problem
Conventional LC filter circuits in power electronic systems face challenges in effectively attenuating high-frequency ripple currents due to their reliance on passive components, which can increase cost and weight, and require additional discrete components to match impedance, leading to inefficiencies in noise reduction.
Innovation Solution
The proposed filter circuit configures conductive paths with varying impedances by using materials with different electrical characteristics for the input and output lines, directing high-frequency currents to ground, allowing for the use of smaller and lighter filter components by optimizing the impedance of the inductor and capacitor placements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional LC filter circuits use passive components to attenuate high-frequency ripple currents, then filtering effectiveness is improved, but cost and weight increase
Solution Approach 1:
The patent changes the impedance parameters of conductive paths at different locations in the circuit. By making the output line impedance greater than the transmission line impedance, the circuit naturally directs high-frequency currents away from the load, reducing the need for heavy passive filtering components while maintaining effective ripple current attenuation.
2Object-affected harmful factors
If conventional LC filter circuits use passive components to attenuate high-frequency ripple currents, then filtering effectiveness is improved, but cost increases
Solution Approach 1:
The patent modifies impedance parameters through material selection and geometric configuration of conductive paths rather than adding expensive passive components. The output line uses materials or structures with higher impedance characteristics, creating a natural frequency-dependent current distribution that reduces ripple without requiring costly inductors and capacitors.
Solution Approach 2:
The patent replaces the mechanical/passive LC filter system with an electrical impedance-based solution. Instead of using physical inductors and capacitors to filter frequencies, the circuit uses impedance-matched conductive paths to naturally direct high-frequency currents, eliminating the need for discrete passive filtering components.
3Object-affected harmful factors
If conventional LC filter circuits are used, then high-frequency ripple currents are reduced, but additional discrete components are required
Solution Approach 1:
The patent merges the filtering function into the existing conductive paths of the circuit rather than adding separate discrete filtering components. The transmission line and output line themselves perform the filtering function through their impedance characteristics, eliminating the need for additional inductors, capacitors, or other discrete filtering elements.
Solution Approach 2:
The conductive paths in the circuit serve multiple functions: they transmit power and simultaneously perform frequency-dependent current direction. The output line's higher impedance serves both as a conductor and as a frequency-selective element that directs high-frequency currents to ground, making the circuit structure itself multi-functional.
4Object-affected harmful factors
If impedance-matching components are added to conventional LC filters, then filtering performance is improved, but device complexity increases
Solution Approach 1:
The patent establishes a specific impedance relationship (output line impedance greater than transmission line impedance) that inherently creates the desired filtering effect. This parameter change eliminates the need for additional impedance-matching components or complex circuit configurations, as the impedance relationship itself directs high-frequency currents through the capacitor to ground.
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 enhances the filtering efficiency by directing high-frequency currents through specific paths, reducing the need for additional components, thereby minimizing weight and cost while maintaining effective noise reduction.
Implementation Method 1
an inductor (L) and a capacitor (C) coupled to ground in the AC input line to attenuate the ripple current
Implementation Method 2
a capacitor (C) coupled to ground in the AC input line to attenuate the ripple current
Data Source
AI summary
An electrical filter circuit is disclosed. The circuit includes a first input line and a second input line. A first transmission line is coupled electrically in series at a first node with a first output line, and an inductor is coupled electrically in series between the first input line and the first transmission line. The filter also includes a second transmission line having a first impedance coupled to the first node. The second input line is coupled electrically in series at a second node with a second output line. A third transmission line is coupled to the second node, and a capacitor is coupled electrically in series between the second transmission line and the third transmission line. The first output line has a second impedance that is greater than the first impedance.