Spiral-Wire Surge Protection Circuit for Compact PCB Layouts
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Solution Overview
Problem
Existing surge protection circuits are difficult to downsize due to the large size of coils used for protecting semiconductor elements from lightning strikes.
Innovation Solution
A surge protection circuit design that includes a printed circuit board, a surge absorber, a conductive and magnetic bar member, and a conductor wire formed in a spiral shape to replace the coil, allowing for compact integration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a coil is used to protect semiconductor elements from lightning strikes, then surge protection capability is improved, but the circuit size increases significantly
Solution Approach 1:
The patent extracts the inductance function from the traditional coil structure and implements it through the magnetic bar member 13 in combination with the conductor wire 14. The magnetic bar member, with its high permeability material, concentrates and enhances the magnetic field generated by the conductor wire, providing the necessary inductance for surge protection without requiring a bulky coil structure.
Solution Approach 2:
The patent changes the material parameter by introducing a magnetic bar member made of high permeability material (such as permalloy or mu-metal) into the circuit. This material parameter change significantly enhances the magnetic field strength and inductance within a compact space, allowing the circuit to achieve adequate surge protection capability while reducing the overall circuit area.
2Reliability
If a coil is used for surge protection, then current increase protection is improved, but the device becomes bulky and difficult to downsize
Solution Approach 1:
The patent extracts the weight burden from the traditional coil by replacing it with a magnetic bar member that provides the same inductance function in a much lighter and more compact form. The magnetic bar member 13, being a solid magnetic material, provides the necessary magnetic flux path without the excessive weight of a large coil structure.
Solution Approach 2:
The patent employs composite material strategy by combining the magnetic bar member made of high permeability material with the conductor wire. This composite structure leverages the magnetic properties of the bar member to enhance the inductance effect, achieving effective current protection while minimizing the overall device weight and size.
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 design enables a significant reduction in circuit size while maintaining effective surge protection by increasing inductance without the need for a bulky coil.
Implementation Method 1
a conductor wire having an end connected to the surge absorber and another end connected to the member, formed in such a way as to extend from a point of intersection between a plane parallel to the face of the printed circuit board and a center line of the member in the orthogonal direction, which is a start point, and formed along at least a part of a virtual spiral shape centered at the point of intersection on the parallel plane
Data Source
AI summary
Disclosed is a surge protection circuit including a printed circuit board; a surge absorber disposed on the printed circuit board; a member having conductivity and magnetism, and extending in a direction orthogonal to a face of the printed circuit board; and a conductor wire having an end connected to the surge absorber and another end connected to the member, formed in such a way as to extend from a point of intersection between a plane parallel to the face of the printed circuit board and a center line of the member in the orthogonal direction, which is a start point, and formed along at least a part of a virtual spiral shape centered at the point of intersection on the parallel plane.