Surge Absorber Polarity-Reversed Inductor Stray Capacitance
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Solution Overview
Problem
Existing surge absorbers, such as those with varistors and inductors, face challenges in achieving impedance matching for high-speed signals due to stray capacitance and inductance components, leading to signal deterioration and difficulty in wide-band frequency characteristics.
Innovation Solution
A surge absorber design featuring a polarity-reversed coupling of internal conductors in the inductor portion, combined with a capacitor portion, which cancels out stray capacitance and allows flexible setting of inductance and capacitance, enabling flat frequency characteristics over a wide band and impedance matching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the stray capacitance component of the surge absorber is decreased, then the deterioration of high-speed signals is reduced, but the control voltage increases and energy resistance decreases
Solution Approach 1:
The surge absorber is divided into multiple functional segments: a first surge absorbing element (varistor) for voltage clamping, a second surge absorbing element for additional protection, and an inductor element for impedance control. This segmentation allows each component to be optimized independently, enabling the stray capacitance to be minimized for signal quality while the inductor provides the necessary energy storage for surge absorption.
Solution Approach 2:
The patent employs a composite structure combining different types of surge absorbing elements (varistors with different characteristics) and an inductor element in a specific configuration. This composite approach creates a balanced system where the total stray capacitance is reduced through the series-parallel arrangement, while the inductor compensates for remaining capacitance effects, achieving both signal integrity and energy resistance.
2Reliability
If a surge absorber with inductor and two varistors is used to alleviate stray capacitance influence, then signal deterioration is reduced, but impedance matching over wide band becomes difficult
Solution Approach 1:
The patent carefully controls and adjusts the electrical parameters of each component: the capacitance values of the varistors, the inductance value of the inductor element, and their interconnection topology. By optimizing these parameters, the stray capacitance of the entire assembly is minimized, and the inductor's reactance compensates for remaining capacitive effects across a wide frequency range, achieving both signal integrity and broad impedance matching.
Solution Approach 2:
The patent converts the inherently harmful stray capacitance of varistors into a beneficial feature by using the inductor element to create a resonant circuit that cancels the capacitive reactance at operating frequencies. The stray capacitance that would normally degrade signals is instead utilized as part of the impedance control mechanism, where the inductor's reactance balances the capacitive reactance, achieving wide-band impedance matching.
3Adaptability or versatility
If separate internal electrodes are provided for capacitor portion construction, then capacitance can be independently controlled, but device complexity increases
Solution Approach 1:
The inductor element's internal conductors serve dual functions: they provide the inductive path for surge absorption while simultaneously forming the capacitor portion through their mutual coupling in polarity-reversed relation. This multi-functionality eliminates the need for separate capacitor electrodes, reducing structural complexity while maintaining independent capacitance control through adjustment of the inductor's winding configuration and conductor geometry.
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
The solution effectively provides excellent impedance matching for high-speed signals, reducing signal deterioration and enabling the surge absorber to protect semiconductor devices from high-voltage static electricity while maintaining compact configuration and simplified design.
Implementation Method 1
an inductor portion (10) having a first internal conductor (11) and a second internal conductor (13) mutually coupled in a polarity-reversed relation
Implementation Method 2
a capacitor portion (40) having a capacitance component (61) connected between the first terminal electrode (3) and the second terminal electrode (5)
Implementation Method 3
a surge absorbing portion (20) having a first internal electrode (21) connected to a connection point between the first internal conductor (11) and the second internal conductor (13), and a second internal electrode (23) connected to the third terminal electrode (7)
Data Source
AI summary
A surge absorber has a first terminal electrode, a second terminal electrode, a third terminal electrode, an inductor portion, a surge absorbing portion, and a capacitor portion. The inductor portion has a first internal conductor and a second internal conductor mutually coupled in a polarity-reversed relation. One end of the first internal conductor is connected to the first terminal electrode. One end of the second internal conductor is connected to the second terminal electrode. The other end of the first internal conductor is connected to the other end of the second internal conductor. The surge absorbing portion has a first internal electrode connected to a connection point between the first internal conductor and the second internal conductor, and a second internal electrode connected to the third terminal electrode. The capacitor portion has a capacitance component connected between the first terminal electrode and the second terminal electrode.