Dual Voice Coil Sounding Device Thermal Management
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Solution Overview
Problem
Traditional single voice coil structures in sounding devices for portable electronic products face challenges in improving low-frequency performance due to high power drive requirements, which can lead to voice coil temperature issues and limited PA voltage output.
Innovation Solution
The sounding device employs a dual voice coil push-pull structure with an outer and inner vibration system, where the magnetic circuit system includes a first and second magnetic gap, and a support ring with a through hole facilitates airflow to push the second diaphragm, distributing power and reducing voice coil temperature risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single voice coil structure is used to drive the diaphragm, then the structure is simple, but the low-frequency performance cannot be improved due to high power drive requirements causing high voice coil temperature and PA voltage output limitation
Solution Approach 1:
The patent divides the single voice coil structure into two separate voice coils (first voice coil and second voice coil) that operate independently. Each voice coil drives its own diaphragm, distributing the power requirements and reducing the thermal load on each individual coil, thereby improving reliability while maintaining reasonable structural complexity
Solution Approach 2:
The patent implements a nested configuration where the first magnetic gap is surrounded by the second magnetic gap, and the first diaphragm is positioned within the inner sounding cavity formed by the second diaphragm. This nested arrangement allows both voice coil systems to coexist in a compact structure while maintaining their independent operation, resolving the contradiction between structural simplicity and thermal management
2Speed
If high power drive is applied to improve low-frequency performance, then the low-frequency response is enhanced, but the voice coil temperature becomes excessively high and PA voltage output is limited
Solution Approach 1:
By segmenting the power drive into two separate voice coils, each coil handles a portion of the total power requirement. This distribution reduces the current and thermal load on each individual coil, allowing the system to achieve enhanced low-frequency response without excessive temperature rise in any single voice coil
Solution Approach 2:
The patent merges the output of two voice coil systems to achieve the desired low-frequency performance. The first and second vibration systems work together, with their combined acoustic output providing enhanced bass response while each individual voice coil operates within safe thermal limits
3Reliability
If a dual voice coil push-pull structure is implemented, then the low-frequency performance is improved and power is distributed, but the device complexity increases
Solution Approach 1:
The patent uses a nested configuration where the first magnetic gap is surrounded by the second magnetic gap, and the first diaphragm is positioned within the inner sounding cavity. This nested arrangement achieves dual voice coil functionality in a compact, integrated structure, reducing the practical complexity increase despite the additional components
Solution Approach 2:
The magnetic circuit system serves multiple functions: it provides magnetic fields for both voice coils, supports both diaphragms, and creates both magnetic gaps. This multi-functionality reduces the need for separate components, thereby mitigating the increase in device complexity while achieving improved low-frequency performance
4Quantity of substance
If the first diaphragm vibrates to generate sound, then the sound output is produced, but the air pressure buildup affects the vibration of the second diaphragm
Solution Approach 1:
The patent extracts the air pressure management function by providing a dedicated pressure relief hole in the partition wall. This hole allows excess air pressure generated by the first diaphragm's vibration to be released, preventing pressure buildup that would interfere with the second diaphragm's vibration, while maintaining the sound output function
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 improves low-frequency performance, reduces the risk of voice coil overheating, and enhances user experience by effectively distributing power and managing thermal issues.
Implementation Method 1
a first voice coil inserted in the first magnetic gap for driving the first diaphragm
Implementation Method 2
a second voice coil inserted in the second magnetic gap for driving the second diaphragm to vibrate
Implementation Method 3
the airflow generated by the vibration of the first diaphragm pushes the second diaphragm through the through hole of the support ring
Implementation Method 4
an airflow generated by the vibration of the second diaphragm is transmitted from the pressure relief hole to an outside
Data Source
AI summary
The present invention provides a sounding device. The sounding device includes a frame, a first vibration system having a first diaphragm and a first voice coil, a second vibration system, a magnetic circuit system with a first magnetic gap and a second magnetic gap, and an inner sounding cavity, a support ring, and an insertion member. Airflow generated by the vibration of the first diaphragm pushes the second diaphragm through the support ring. Compared with the related art, the sounding device of the present invention is convenient to improve the low frequency performance and has a better user experience effect.