Closed-Loop Inductor Layout With Capacitive Harmonic Filtering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional inductor devices with closed loops experience decreased inductance and quality factors, particularly when closed loops are near other elements, affecting the performance of the device, especially at specific frequency ranges.
Innovation Solution
The inductor device incorporates a first and second trace with sub-traces, a capacitor, and connection elements forming a closed loop, where the capacitor filters low frequency signals while allowing high frequency signals to pass, thereby preventing interference with the operating frequency and reducing the impact of harmonics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a closed loop is disposed near elements in inductor devices, then the inductance and quality factors are improved, but the harmful electromagnetic interference and harmonic signals are increased
Solution Approach 1:
The patent extracts and separates the filtering function from the inductor structure by adding a dedicated capacitor connected to the closed loop. This capacitor specifically targets and removes harmful low-frequency harmonic signals (such as 2nd, 4th harmonics) while preserving the inductor's quality factor enhancement from the closed loop configuration.
Solution Approach 2:
The capacitor acts as an intermediary element between the closed loop and ground, providing a controlled path for harmonic signals to be shunted away. This mediator allows the closed loop to maintain its beneficial electromagnetic coupling for quality factor improvement while the capacitor selectively eliminates harmful low-frequency harmonics.
2Object-generated harmful factors
If a filter is disposed outside the inductor device, then the harmonic signals are filtered, but the circuit performance is degraded and additional costs are incurred
Solution Approach 1:
The patent merges the filtering function directly into the inductor device structure by integrating a capacitor within the same device. This combination allows the inductor and filter to work together as a unified system, maintaining optimal circuit performance while eliminating the need for separate external filter components.
Solution Approach 2:
The integrated capacitor serves multiple functions: it filters harmful harmonic signals, maintains the quality factor of the inductor, and eliminates the need for external filters. This multi-functional element improves overall device performance while reducing component count and cost.
3Object-generated harmful factors
If multiple capacitors are disposed in series, then the high frequency signals are filtered, but the device complexity and manufacturing difficulty are increased
Solution Approach 1:
The patent segments the filtering function into two distinct parts: a first capacitor for low-frequency harmonic filtering and a second capacitor for high-frequency signal filtering. This segmentation allows each capacitor to be optimized for its specific frequency range and simplifies the manufacturing process compared to using multiple capacitors in series for all frequency ranges.
Solution Approach 2:
The patent uses parameter changes by selecting different capacitor values and configurations for different frequency ranges. The first capacitor is optimized for low-frequency harmonic suppression, while the second capacitor is optimized for high-frequency filtering, allowing effective broad-spectrum filtering without complex series configurations.
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 allows high frequency signals to be amplified and used to cancel out negative effects, eliminating the need for external filters and reducing costs, while effectively filtering both low and high frequency signals, thus maintaining the quality factor of the inductor device.
Implementation Method 1
The capacitor of the inductor device brings a function to filter low frequency, such that low frequency signal induced at the inductor device cannot pass but high frequency signal can pass the capacitor directly
Implementation Method 2
The signals which are induced in two traces of the folded inductor will be cancelled because the directions of the signals in the two traces are opposite to each other
Data Source
AI summary
An inductor device includes a first trace, a second trace, a first capacitor, and at least one connection element. The first trace includes at least two sub-traces. One terminal of the at least two sub-traces is coupled to a first node. The second trace includes at least two sub-traces. One terminal of the at least two sub-traces is coupled to a second node. The first capacitor is coupled between the first node and the second node. The at least one connection element is coupled to another terminal of the at least two sub-traces of the first trace and another terminal of the at least two sub-traces of the second trace, such that the first trace and the second trace form a closed loop.