Inductor Metal Frame Damping for Acoustic Noise Reduction
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Solution Overview
Problem
Acoustic noise in inductors has become a concern due to increased current levels, particularly from vibrations of the core and coil, which existing technologies have not adequately addressed.
Innovation Solution
The electronic component includes an inductor with metal frames connected to external electrodes, where the frames' design absorbs vibrations through elastic force, reducing noise transmission to the circuit board, and features a structure that distributes heat to prevent thermal shocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If high levels of current are applied to increase functionality and rapid charging capability, then power and energy transfer efficiency are improved, but acoustic noise generated by magnetostriction and vibrations increases
Solution Approach 1:
A damping member is introduced as an intermediary element between the inductor body and the circuit board. This damping member absorbs and dissipates vibrations generated by the inductor body during high current operation, preventing direct transmission to the circuit board and reducing acoustic noise while allowing high current levels to be maintained for power and rapid charging functions.
Solution Approach 2:
The vibration and acoustic energy generated by high current operation is converted into a beneficial damping effect. The damping member transforms the harmful vibrational energy into heat through internal friction and material damping, converting the harmful acoustic noise into a passive energy dissipation mechanism that protects the circuit board while allowing high power operation.
2Stability of the object's composition
If rigid mounting structures are used to securely attach the inductor to the circuit board, then mechanical stability is improved, but vibration transfer and acoustic noise increase
Solution Approach 1:
The mounting structure transitions from a rigid connection to a compliant connection by introducing a damping member with specific mechanical properties. The damping member has controlled elasticity and damping characteristics that allow it to maintain mechanical stability while filtering out high-frequency vibrations. This parameter change in the mounting structure's stiffness and damping properties enables secure attachment without direct vibration transfer.
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 design effectively decreases acoustic noise and enhances the reliability of inductors by minimizing vibration transfer and improving thermal management, preventing defects like cracks and chipping.
Implementation Method 1
a damping member extending from a lower surface of the inductor body to a lower surface of the circuit board, wherein the damping member comprises a first region having a first cross-sectional area taken perpendicular to a length direction of the damping member, and a second region having a second cross-sectional area taken perpendicular to the length direction of the damping member
Implementation Method 2
Acoustic noise is commonly generated in an inductor due to magnetostriction of a core material, caused by the magnetic force applied to the inductor by the formation of a magnetic field upon the application of a current
Data Source
AI summary
An electronic component includes an inductor including an inductor body and first and second external electrodes, the first and second external electrodes including first and second body portions and first and second band portions extended from the first and second body portions to portions of an upper surface of the inductor body in a thickness direction, respectively; and first and second metal frames including first and second upper horizontal portions bonded to the first and second band portions, respectively, first and second lower horizontal portions disposed below the inductor body to be spaced apart from each other, and first and second vertical portions connecting end portions of the first and second upper horizontal portions and end portions of the first and second lower horizontal portions to each other and disposed to be spaced apart from the first and second body portions, respectively.